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| 19-3006; Rev 0; 1/04 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers General Description The MAX9750/MAX9751/MAX9755 combine a stereo, 2.6W audio power amplifier and stereo DirectDrive 110mW headphone amplifier in a single device. The headphone amplifier uses Maxim's patented DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DCblocking capacitors, saving cost, space, and component height. A high 90dB PSRR and low 0.01% THD+N ensures clean, low-distortion amplification of the audio signal. The MAX9750 features an analog volume control, and a BEEP input. The MAX9751 features a 2:1 input multiplexer, allowing multiple audio sources to be selected. All devices feature a single-supply voltage, a shutdown mode, logicselectable gain, and a headphone sense input. Industryleading click-and-pop suppression eliminates audible transients during power and shutdown cycles. The MAX9750/MAX9751/MAX9755 are offered in spacesaving, thermally efficient 28-pin thin QFN (5mm x 5mm x 0.8mm) and 28-pin TSSOP-EP packages. Both devices have thermal-overload and output short-circuit protection, and are specified over the extended -40C to +85C temperature range. Features No DC-Blocking Capacitors Required--Provides Industry's Most Compact Notebook Audio Solution PC2001 Compliant 5V Single-Supply Operation Class AB 2.6W Stereo BTL Speaker Amplifiers 110mW DirectDrive Headphone Amplifiers High 90dB PSRR Low-Power Shutdown Mode Industry-Leading Click-and-Pop Suppression Low 0.01% THD+N at 1kHz Short-Circuit and Thermal Protection Selectable Gain Settings Analog Volume Control (MAX9750) Beep Input with Glitch Filter (MAX9750) 2:1 Stereo Input MUX (MAX9751) 8kV ESD-Protected Headphone Driver Outputs Available in Space-Saving, Thermally Efficient Packages 28-Pin Thin QFN (5mm x 5mm x 0.8mm) 28-Pin TSSOP-EP MAX9750/MAX9751/MAX9755 Applications Notebook PCs Tablet PCs Portable DVD Flat-Panel TVs PC Displays LCD Projectors Simplified Block Diagrams PART MAX9750AETI* MAX9750BETI* MAX9750BEUI* MAX9750CETI MAX9751ETI* MAX9751EUI* VOL Ordering Information TEMP RANGE PINPACKAGE MAXIMUM GAIN (dB) 13.5 13.5 19.5 19.5 10.5 10.5 10.5 10.5 10.5 10.5 -40C to +85C 28 Thin QFN -40C to +85C 28 Thin QFN -40C to +85C 28 TSSOP-EP** -40C to +85C 28 Thin QFN -40C to +85C 28 Thin QFN -40C to +85C 28 TSSOP-EP** -40C to +85C 28 Thin QFN -40C to +85C 28 TSSOP-EP** MAX9750AEUI* -40C to +85C 28 TSSOP-EP** MAX9750CEUI* -40C to +85C 28 TSSOP-EP** MAX9755AETI* MAX9755AEUI* BEEP *Future product--contact factory for availability. **EP = Exposed Paddle. Lead-free MAX9750 package. Simplifed Block Diagrams continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VDD, PVDD, HPVDD, CPVDD to GND)..........+6V GND to PGND.....................................................................0.3V CPVSS, C1N, VSS to GND .........................-6.0V to (GND + 0.3V) HPOUT_ to GND ....................................................................3V Any Other Pin .............................................-0.3V to (VDD + 0.3V) Duration of OUT_ Short Circuit to GND or PVDD ........Continuous Duration of OUT_+ Short Circuit to OUT_- .................Continuous Duration of HPOUT_ Short Circuit to GND, VSS or HPVDD .........................................................Continuous Continuous Current (PVDD, OUT_, PGND) ...........................1.7A Continuous Current (CPVDD, C1N, C1P, CPVSS, VSS, HPVDD, HPOUT_) .......................................................................850mA Continuous Input Current (All Other Pins) ........................20mA Continuous Power Dissipation (TA = +70C) 28-Pin Thin QFN (derate 20.8mW/C above +70C) ..1667mW 28-Pin TSSOP-EP (derate 23.8mW/C above +70C).1904mW Junction Temperature ......................................................+150C Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VDD = PVDD = CPVDD = HPVDD = 5V, GND = PGND = CPGND = 0V, SHDN = VDD, CBIAS = 1F, C1 = C2 = 1F, speaker load terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL = RL = 33k = GND, MAX9751/MAX9755: GAIN = VDD = IN1/2 = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER GENERAL Supply Voltage Range Headphone Supply Voltage Quiescent Supply Current Shutdown Supply Current Bias Voltage Switching Time Input Resistance Turn-On Time SPEAKER AMPLIFIER (HPS = GND) Output Offset Voltage Power-Supply Rejection Ratio (Note 3) VOS PSRR Measured between OUT_+ - OUT_PVDD or VDD = 4.5V to 5.5V (TA = +25C) f = 1kHz, VRIPPLE = 200mVP-P f = 10kHz, VRIPPLE = 200mVP-P 75 0.4 90 80 55 dB 6 mV VDD, PVDD CPVDD, HPVDD IDD ISHDN VBIAS tSW RIN tSON Gain or input switching Amplifier inputs (Note 2) 10 Inferred from PSRR test Inferred from PSRR test HPS = GND, speaker mode, RL = HPS = VDD, headphone mode, RL = SHDN = GND 1.7 4.5 3 14 7 0.2 1.8 10 20 25 30 5.5 5.5 29 13 5 1.9 V V mA A V s k ms SYMBOL CONDITIONS MIN TYP MAX UNITS 2 _______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VDD = PVDD = CPVDD = HPVDD = 5V, GND = PGND = CPGND = 0V, SHDN = VDD, CBIAS = 1F, C1 = C2 = 1F, speaker load terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL = RL = 33k = GND, MAX9751/MAX9755: GAIN = VDD = IN1/2 = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MAX9750A/ MAX9750B/ MAX9751/ MAX9755 MAX9750C MAX9750A/ MAX9750B/ MAX9751/ MAX9755 MAX9750C MAX9750A/ MAX9750B/ MAX9751/ MAX9755 MAX9750C 1.2 MIN TYP MAX UNITS MAX9750/MAX9751/MAX9755 RL = 8 1.4 0.65 0.8 Output Power POUT THD+N = 1%, f = 1kHz, TA = +25C 2.3 W 1.5 RL = 4 RL = 3 2.6 2.2 0.01 0.02 90 80 200 75 60 1.4 dB V/s % dB VRMS pF Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio Noise Capacitive-Load Drive Crosstalk Slew Rate THD+N SNR Vn CL RL = 8, POUT = 500mW, f = 1kHz RL = 4, POUT = 1W, f = 1kHz RL = 8, POUT = 1W, BW = 22Hz to 22kHz BW = 22Hz to 22kHz, A-weighted No sustained oscillations L to R, R to L, f = 10kHz Any unselected input to any active input, f = 10kHz (MAX9751) SR GAIN1 = 0, GAIN2 = 0 GAIN1 = 1, GAIN2 = 0 MAX9750A GAIN1 = 0, GAIN2 = 1 GAIN1 = 1, GAIN2 = 1 GAIN1 = 0, GAIN2 = 0 GAIN1 = 1, GAIN2 = 0 GAIN1 = 0, GAIN2 = 1 GAIN1 = 1, GAIN2 = 1 GAIN1 = 0, GAIN2 = 0 MAX9750C GAIN1 = 1, GAIN2 = 0 GAIN1 = 0, GAIN2 = 1 GAIN1 = 1, GAIN2 = 1 GAIN = 1 GAIN = 0 9 10.5 12 13.5 15 16.5 18 19.5 6 7.5 9 10.5 9 10.5 dB dB Gain (Maximum Volume Setting) AVMAX(SPKR) MAX9750B Gain (MAX9751/MAX9755) AV _______________________________________________________________________________________ 3 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 ELECTRICAL CHARACTERISTICS (continued) (VDD = PVDD = CPVDD = HPVDD = 5V, GND = PGND = CPGND = 0V, SHDN = VDD, CBIAS = 1F, C1 = C2 = 1F, speaker load terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL = RL = 33k = GND, MAX9751/MAX9755: GAIN = VDD = IN1/2 = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Output Offset Voltage Power-Supply Rejection Ratio (Note 3) SYMBOL VOS PSRR TA = +25C HPVDD = 3V to 5.5V, TA = +25C f = 1kHz, VRIPPLE = 200mVP-P f = 10kHz, VRIPPLE = 200mVP-P Output Power Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio Noise Capacitive-Load Drive Crosstalk Slew Rate ESD Gain CHARGE PUMP Charge-Pump Frequency VOLUME CONTROL (MAX9750_) VOL Input Impedance VOL Input Hysteresis Full Mute Input Voltage Channel Matching BEEP INPUT (MAX9750_) Beep Signal Minimum Amplitude Beep Signal Minimum Frequency VBEEP fBEEP 0.8 200 VP-P Hz (Note 4) AV = -25dB to +13.5dB RVOL 100 10 0.858 x HPVDD 0.2 M mV V dB fOSC 500 550 600 kHz SR ESD AV IEC air discharge GAIN2 = GAIN = 1, GAIN1 = X GAIN2 = GAIN = 0, GAIN1 = X POUT THD+N = 1%, f = 1kHz, TA = +25C RL = 32 RL = 16 40 70 CONDITIONS MIN TYP 2 75 73 63 50 110 0.007 0.03 95 12 200 88 88 0.4 8 0 3 dB V/s kV dB mW dB MAX 7 UNITS mV HEADPHONE AMPLIFIER (HPS = VDD) THD+N SNR Vn CL RL = 32, POUT = 20mW, f = 1kHz RL = 16, POUT = 75mW, f = 1kHz RL = 32, POUT = 50mW, BW = 22Hz to 22kHz BW = 22Hz to 22kHz No sustained oscillations L to R, R to L, f = 10kHz Any unselected input to any active input, f = 10kHz (MAX9751) % dB VRMS pF 4 _______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VDD = PVDD = CPVDD = HPVDD = 5V, GND = PGND = CPGND = 0V, SHDN = VDD, CBIAS = 1F, C1 = C2 = 1F, speaker load terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL = RL = 33k = GND, MAX9751/MAX9755: GAIN = VDD = IN1/2 = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Logic Input High Voltage Logic Input Low Voltage Logic Input Current SYMBOL VIH VIL IIN CONDITIONS MIN 2 0.8 1 TYP MAX UNITS V V A MAX9750/MAX9751/MAX9755 LOGIC INPUT (SHDN, GAIN1, GAIN2, GAIN, VOL, IN1/2, HPS) Note 1: Note 2: Note 3: Note 4: Note 5: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design. Guaranteed by design. Not production tested. PSRR is specified with the amplifier input connected to GND through CIN. See Table 3 for details of the mute levels. The value of RB dictates the minimum beep signal amplitude (see the Beep Input section). _______________________________________________________________________________________ 5 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Typical Operating Characteristics (Measurement BW = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE) MAX9750/51 toc01 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE) MAX9750/51 toc02 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE) VCC = 5V RL = 8 AV = 10.5dB OUTPUT POWER = 100mW MAX9750/51 toc03 10 1 VCC = 5V RL = 3 AV = 10.5dB OUTPUT POWER = 1.5W 10 1 VCC = 5V RL = 4 AV = 10.5dB OUTPUT POWER = 1.25W 10 1 THD+N (%) THD+N (%) 0.1 0.1 THD+N (%) 0.1 0.01 OUTPUT POWER = 500mW 0.001 0.01 OUTPUT POWER = 500mW 0.001 0.01 OUTPUT POWER = 600mW 0.001 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (SPEAKER MODE) MAX9750/51 toc04 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (SPEAKER MODE) MAX9750/51 toc05 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (SPEAKER MODE) VCC = 5V RL = 8 AV = 10.5dB MAX9750C MAX9750/51 toc06 100 VCC = 5V RL = 3 AV = 10.5dB MAX9750C 100 10 10 VCC = 5V RL = 4 AV = 10.5dB MAX9750C 100 10 THD+N (%) THD+N (%) 1 fIN = 10kHz 0.1 THD+N (%) 1 fIN = 10kHz 0.1 1 0.1 fIN = 10kHz 0.01 fIN = 20Hz 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT POWER (W) fIN = 1kHz 0.01 fIN = 20Hz 0.001 0 0.5 1.0 1.5 OUTPUT POWER (W) 2.0 fIN = 1kHz 0.01 fIN = 20Hz 0.001 0 0.2 0.4 0.6 0.8 OUTPUT POWER (W) 1.0 1.2 fIN = 1kHz OUTPUT POWER vs. LOAD RESISTANCE (SPEAKER MODE) MAX9750/51 toc07 POWER DISSIPATION vs. OUTPUT POWER (SPEAKER MODE) MAX9750/51 toc08 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (SPEAKER MODE) -10 -20 -30 PSRR (dB) VRIPPLE = 200mVP-P AV = 10.5dB OUTPUT REFERRED MAX9750/51 toc09 3.0 2.5 OUTPUT POWER (W) 2.0 THD+N = 10% 1.5 1.0 0.5 0 1 10 LOAD RESISTANCE () THD+N = 1% VCC = 5V f = 1kHz AV = 10.5dB MAX9750C 5 VDD = 5V f = 1kHz POUT = POUTL + POUTR MAX9750C RL = 4 0 POWER DISSIPATION (mW) 4 3 -40 -50 -60 -70 2 RL = 8 1 -80 -90 0 100 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 OUTPUT POWER (W) -100 10 100 1k FREQUENCY (Hz) 10k 100k 6 _______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Typical Operating Characteristics (continued) (Measurement BW = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) CROSSTALK vs. FREQUENCY (SPEAKER MODE) -10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 10 100 1k FREQUENCY (Hz) 10k 100k 20ms/div VCC = 5V VRIPPLE = 200mVP-P RL = 4 MAX9750/51 toc10 TURN-ON RESPONSE (SPEAKER MODE) MAX9750/51 toc11 0 5V/div SHDN OUT_+ AND OUT_- 2V/div LEFT TO RIGHT RIGHT TO LEFT OUT_+ - OUT_RL = 8 100mV/div TURN-OFF RESPONSE (SPEAKER MODE) MAX9750/51 toc12 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (HEADPHONE MODE) MAX9750/51 toc13 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (HEADPHONE MODE) VDD = 5V RL = 32 AV = 3dB OUTPUT POWER = 45mW THD+N (%) 0.1 MAX9750/51 toc14 10 5V/div VDD = 5V RL = 16 AV = 3dB OUTPUT POWER = 90mW THD+N (%) 10 SHDN OUT_+ AND OUT_- 1 1 2V/div 0.1 0.01 OUTPUT POWER = 30mW 0.01 OUTPUT POWER = 10mW OUT_+ - OUT_RL = 8 20mV/div 0.001 0.0001 20ms/div 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (HEADPHONE MODE) MAX9750/51 toc15 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (HEADPHONE MODE) VDD = 3.3V RL = 32 AV = 3dB OUTPUT POWER = 45mW THD+N (%) 0.1 MAX9750/51 toc16 10 VDD = 3.3V RL = 16 AV = 3dB OUTPUT POWER = 30mW THD+N (%) 0.1 10 1 1 0.01 OUTPUT POWER = 10mW 0.01 OUTPUT POWER = 10mW 0.001 0.001 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k _______________________________________________________________________________________ 7 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Typical Operating Characteristics (continued) (Measurement BW = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (HEADPHONE MODE) MAX9750/51 toc17 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (HEADPHONE MODE) MAX9750/51 toc18 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (HEADPHONE MODE) VDD = 3.3V RL = 16 AV = 3dB MAX9750/51 toc19 1000 100 10 THD+N (%) VDD = 5V RL = 16 AV = 3dB 1000 100 10 THD+N (%) VDD = 5V RL = 32 AV = 3dB 1000 100 10 THD+N (%) fIN = 1kHz 1 1 0.1 0.01 fIN = 10kHz 1 0.1 0.01 0.001 fIN = 1kHz fIN = 10kHz fIN = 20Hz fIN = 20Hz 0.1 0.01 0.001 fIN = 10kHz fIN = 20Hz 0.001 0 25 50 fIN = 1kHz 100 OUTPUT POWER (mW) 75 125 150 0 20 40 60 80 100 0 10 20 30 40 50 60 OUTPUT POWER (mW) OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (HEADPHONE MODE) VDD = 3.3V RL = 32 AV = 3dB MAX9750/51 toc20 OUTPUT POWER vs. LOAD RESISTANCE (HEADPHONE MODE) MAX9750/51 toc21 POWER DISSIPATION vs. OUTPUT POWER (HEADPHONE MODE) 225 POWER DISSIPATION (mW) 200 175 150 125 100 75 50 25 0 MAX9750/51 toc22 1000 100 10 THD+N (%) 1 180 160 140 OUTPUT POWER (mW) 120 100 80 60 40 THD+N = 1% THD+N = 10% 250 RL = 16 fIN = 1kHz fIN = 20Hz fIN = 10kHz 0.1 0.01 0.001 0 10 20 60 70 OUTPUT POWER (mW) 30 40 50 80 90 RL = 32 VDD = 5V f = 1kHz POUT = POUTL + POUTR 0 25 50 75 100 125 150 175 200 225 250 OUTPUT POWER (mW) 20 0 10 100 LOAD RESISTANCE () 1000 OUTPUT POWER vs. SUPPLY VOLTAGE (HEADPHONE MODE) MAX9750/51 toc23 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (HEADPHONE MODE) -10 -20 -30 PSRR (dB) VRIPPLE = 200mVP-P AV = 10.5dB OUTPUT REFERRED MAX9750/51 toc24 125 RL = 16 100 OUTPUT POWER (mW) 0 75 RL = 32 50 -40 -50 -60 -70 25 f = 1kHz 0 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) -80 -90 -100 10 100 1k FREQUENCY (Hz) 10k 100k 8 _______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Typical Operating Characteristics (continued) (Measurement BW = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) CROSSTALK vs. FREQUENCY (HEADPHONE MODE) MAX9750/51 toc25 OUTPUT POWER vs. CHARGE-PUMP CAPACITANCE AND LOAD RESISTANCE MAX9750/51 toc26 HEADPHONE OUTPUT SPECTRUM VDD = 5V f = 1kHz VOUT = -60dB RL = 32 MAX9750/51 toc27 0 -20 CROSSTALK (dB) -40 -60 -80 VCC = 5V VRIPPLE = 200mVP-P RL = 32 200 180 160 OUTPUT POWER (mW) 140 120 100 80 60 40 C1 = C2 = 1F 0 -20 MAGNITUDE (dB) -40 -60 -80 -100 -120 -140 VDD = 5V f = 1kHz THD+N = 1% C1 = C2 = 2.2F RIGHT TO LEFT -100 LEFT TO RIGHT -120 10 100 1k FREQUENCY (Hz) 10k 100k 20 0 10 20 30 40 50 LOAD RESISTANCE () 0 5 10 FREQUENCY (Hz) 15 20 TURN-ON RESPONSE (HEADPHONE MODE) MAX9750/51 toc28 TURN-OFF RESPONSE (HEADPHONE MODE) MAX9750/51 toc29 5V/div SHDN SHDN 5V/div HPOUT_ 20mV/div HPOUT_ 20mV/div RL = 32 10ms/div RL = 32 10ms/div SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX9750/51 toc30 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX9750/51 toc31 18 16 SUPPLY CURRENT (mA) 14 12 10 8 6 4 2 0 4.50 4.75 5.00 5.25 HPS = VDD HPS = GND 0.35 0.30 SUPPLY CURRENT (A) 0.25 0.20 0.15 0.10 0.05 0 5.50 4.50 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 9 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Pin Description PIN MAX9750 THIN QFN 1 2 3, 19 4 5 6, 16 7 8 9 10 11 12 13 14 15 17 18 20 21 22 23 24 25 26 27 28 -- -- -- -- -- -- -- TSSOP 5 6 7, 23 8 9 10, 20 11 12 13 14 15 16 17 18 19 21 22 24 25 26 27 28 1 2 3 4 -- -- -- -- -- -- -- MAX9751 THIN QFN -- -- 3, 19 4 5 6, 16 7 8 9 10 11 12 13 14 15 17 18 20 21 22 -- -- 25 26 -- -- 1 2 23 24 27 28 -- TSSOP -- -- 7, 23 8 9 10, 20 11 12 13 14 15 16 17 18 19 21 22 24 25 26 -- -- 1 2 -- -- 5 6 27 28 3 4 -- MAX9755 THIN QFN 2 -- 3, 19 4 5 6, 16 7 8 9 10 11 12 13 14 15 17 18 20 21 22 -- -- 25 23, 26 28 -- -- -- -- 24 -- -- 1, 27 TSSOP 6 -- 7, 23 8 9 10, 20 11 12 13 14 15 16 17 18 19 21 22 24 25 26 -- -- 1 2, 27 4 -- -- -- -- 28 -- -- 3, 5 INL BEEP PGND OUTL+ OUTLPVDD CPVDD C1P CPGND C1N CPVSS VSS HPOUTR HPOUTL HPVDD OUTROUTR+ HPS BIAS SHDN GAIN2 GAIN1 VDD GND INR VOL INL1 INL2 IN1/2 GAIN INR1 INR2 N.C. Left-Channel Audio Input Audible Alert Beep Input Power Ground Left-Channel Positive Speaker Output Left-Channel Negative Speaker Output Speaker Amplifier Power Supply Charge-Pump Power Supply Charge-Pump Flying-Capacitor Positive Terminal Charge-Pump Ground Charge-Pump Flying-Capacitor Negative Terminal Charge-Pump Output. Connect to VSS. Headphone Amplifier Negative Power Supply Right-Channel Headphone Output Left-Channel Headphone Output Headphone Positive Power Supply Right-Channel Negative Speaker Output Right-Channel Positive Speaker Output Headphone Sense Input Common-Mode Bias Voltage. Bypass with a 1F capacitor to GND. Shutdown. Drive SHDN low to disable the device. Connect SHDN to VDD for normal operation. Gain Control Input 2 Gain Control Input 1 Power Supply Ground Right-Channel Audio Input Analog Volume Control Input Left-Channel Audio Input 1 Left-Channel Audio Input 2 Input Select Gain Select Right-Channel Audio Input 1 Right-Channel Audio Input 2 No Connection. Not internally connected. NAME FUNCTION 10 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 MAX9750 ONLY IN_ VOUT VDD VDD/2 GND BIAS BIAS OUT_+ CONVENTIONAL DRIVER-BIASING SCHEME +VDD VOL VOLUME CONTROL OUT_ BIAS GND HPOUT_ GND DirectDrive BIASING SCHEME -VDD Figure 1. MAX9750/MAX9751 Signal Path Figure 2. Traditional Headphone Amplifier Output Waveform vs. DirectDrive Headphone Amplifier Output Waveform Detailed Description The MAX9750/MAX9751/MAX9755 combine a 2.6W BTL speaker amplifier and a 110mW DirectDrive headphone amplifier with integrated headphone sensing and comprehensive click-and-pop suppression. The MAX9750 features an analog volume control, BEEP input, and four-level gain control. The MAX9751 features a 2:1 input stereo multiplexer and two-level gain control. All devices feature high 90dB PSRR, low 0.01% THD+N, industry-leading click-pop performance, and a lowpower shutdown mode. Each signal path consists of an input amplifier that sets the gain of the signal path and feeds both the speaker and headphone amplifier (Figure 1). The speaker amplifier uses a BTL architecture, doubling the voltage drive to the speakers and eliminating the need for DCblocking capacitors. The output consists of two signals, identical in magnitude, but 180 out of phase. The headphone amplifiers use Maxim's patented DirectDrive architecture that eliminates the bulky output DC-blocking capacitors required by traditional headphone amplifiers. A charge pump inverts the positive supply (CPVDD), creating a negative supply (CPVSS). The headphone amplifiers operate from these bipolar supplies with their outputs biased about GND (Figure 2). The amplifiers have almost twice the supply range compared to other single-supply amplifiers, nearly quadrupling the available output power. The benefit of the GND bias is that the amplifier outputs no longer have a DC component (typically VDD / 2). This eliminates the large DC-blocking capacitors required with conventional headphone amplifiers, conserving board space and system cost, and improving frequency response. The MAX9750 features an analog volume control that varies the gain of the amplifiers based on the DC voltage applied at VOL. Both devices feature an undervoltage lockout that prevents operation from an insufficient power supply and click-and-pop suppression that eliminates audible transients on startup and shutdown. The amplifiers include thermal-overload and short-circuit protection, and can withstand 8kV ESD strikes on the headphone amplifier outputs (IEC air discharge). An additional feature of the speaker amplifiers is that there is no phase inversion from input to output. DirectDrive Conventional single-supply headphone amplifiers have their outputs biased about a nominal DC voltage (typically half the supply) for maximum dynamic range. Large coupling capacitors are needed to block this DC bias from the headphones. Without these capacitors, a 11 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 significant amount of DC current flows to the headphone, resulting in unnecessary power dissipation and possible damage to both headphone and headphone amplifier. Maxim's patented DirectDrive architecture uses a charge pump to create an internal negative supply voltage. This allows the MAX9750/MAX9751/MAX9755 headphone amplifier output to be biased about GND, almost doubling the dynamic range while operating from a single supply. With no DC component, there is no need for the large DC-blocking capacitors. Instead of two large capacitors (220F typ), the MAX9750/MAX9751/ MAX9755 charge pump requires only two small ceramic capacitors (1F typ), conserving board space, reducing cost, and improving the frequency response of the headphone amplifier. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics for details of the possible capacitor values. Previous attempts to eliminate the output coupling capacitors involved biasing the headphone return (sleeve) to the DC bias voltage of the headphone amplifiers. This method raised some issues: 1) The sleeve is typically grounded to the chassis. Using this biasing approach, the sleeve must be isolated from system ground, complicating product design. 2) During an ESD strike, the amplifier's ESD structures are the only path to system ground. The amplifier must be able to withstand the full ESD strike. 3) When using the headphone jack as a lineout to other equipment, the bias voltage on the sleeve may conflict with the ground potential from other equipment, resulting in large ground-loop current and possible damage to the amplifiers. Low-Frequency Response In addition to the cost and size disadvantages, the DCblocking capacitors limit the low-frequency response of the amplifier and distort the audio signal: 1) The impedance of the headphone load to the DCblocking capacitor forms a highpass filter with the -3dB point determined by: f-3dB = 1 2RLCOUT LOW-FREQUENCY ROLLOFF (RL = 16) 0 -3 -6 ATTENUATION (dB) -9 -12 -15 -18 -21 -24 -27 -30 10 100 1k FREQUENCY (Hz) 10k 100k 33F DirectDrive 330F 220F 100F Figure 3. Low-Frequency Attenuation of Common DC-Blocking Capacitor Values the filter can attenuate low-frequency signals within the audio band. Larger values of COUT reduce the attenuation but are physically larger, more expensive capacitors. Figure 3 shows the relationship between the size of COUT and the resulting low-frequency attenuation. Note that the -3dB point for a 16 headphone with a 100F blocking capacitor is 100Hz, well within the audio band. 2) The voltage coefficient of the capacitor, the change in capacitance due to a change in the voltage across the capacitor, distorts the audio signal. At frequencies around the -3dB point, the reactance of the capacitor dominates, and the voltage coefficient appears as frequency-dependent distortion. Figure 4 shows the THD+N introduced by two different capacitor dielectrics. Note that around the -3dB point, THD+N increases dramatically. The combination of low-frequency attenuation and frequency-dependent distortion compromises audio reproduction. DirectDrive improves low-frequency reproduction in portable audio equipment that emphasizes low-frequency effects such as multimedia laptops, and MP3, CD, and DVD players. Charge Pump The MAX9750/MAX9751/MAX9755 feature a low-noise charge pump. The 550kHz switching frequency is well beyond the audio range, and does not interfere with the audio signals. The switch drivers feature a controlled switching speed that minimizes noise generated by turnon and turn-off transients. Limiting the switching speed of the charge pump minimizes the di/dt noise caused by the where RL is the impedance of the headphone and COUT is the value of the DC-blocking capacitor. The highpass filter is required by conventional single-ended, single-supply headphone amplifiers to block the midrail DC component of the audio signal from the headphones. Depending on the -3dB point, 12 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 ADDITIONAL THD+N DUE TO DC-BLOCKING CAPACITORS 10 VDD MAX9750/ MAX9751/ MAX9755 SHUTDOWN CONTROL HPS TANTALUM 0.01 HPOUTL HPOUTR 1k ALUM/ELEC 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k 1k 20 14 13 10A 1 THD+N (%) 0.1 0.001 Figure 4. Distortion Contributed by DC-Blocking Capacitors Figure 5. HPS Configuration parasitic bond wire and trace inductance. Although not typically required, additional high-frequency ripple attenuation can be achieved by increasing the size of C2 (see the Typical Application Circuit). Gain Selection MAX9750 The MAX9750 features an internally set, selectable gain. The GAIN1 and GAIN2 inputs set the maximum gain of the MAX9750 speaker and headphone amplifiers (Table 1). The gain of the device can vary based upon the voltage at VOL (see the Analog Volume Control section). However, the maximum gain cannot be exceeded. MAX9751/MAX9755 The gain of the MAX9751/MAX9755 is set by the GAIN input. Driving GAIN high sets the gain of the speaker amplifiers to 9dB and the gain of the headphone amplifiers to 0dB. Driving GAIN low sets the gain of the speaker amplifiers to 10.5dB, and the gain of the headphone amplifiers to 3dB (Table 2). Headphone Sense Input (HPS) The headphone sense input (HPS) monitors the headphone jack and automatically configures the device based upon the voltage applied at HPS. A voltage of less than 0.8V sets the device to speaker mode. A voltage of greater than 2V disables the bridge amplifiers and enables the headphone amplifiers. For automatic headphone detection, connect HPS to the control pin of a 3-wire headphone jack as shown in Figure 5. With no headphone present, the output impedance of the headphone amplifier pulls HPS low. When a headphone plug is inserted into the jack, the control pin is disconnected from the tip contact and HPS is pulled to VDD through a 10A current source. Analog Volume Control (VOL) The MAX9750 features an analog volume control that varies the gain of the device in 31 discrete steps based upon the DC voltage applied to VOL. The input range of VVOL is from 0 (full volume) to 0.858 x HPVDD (full mute), with example step sizes shown in Table 3. Connect the reference of the device driving VOL (Figure 6) to HPVDD. Since the volume control ADC is ratiometric to HPVDD, any changes in HPVDD are negated. The gain step sizes are not constant; the step sizes are 0.5dB/step at the upper extreme, 2dB/step in the midrange, and 4dB/step at the lower extreme. Figure 7 shows the transfer function of the volume control for a 3.3V supply. BIAS The MAX9750/MAX9751/MAX9755 feature an internally generated, power-supply independent, common-mode bias voltage of 1.8V referenced to GND. BIAS provides both click-and-pop suppression and sets the DC bias level for the amplifiers. Choose the value of the bypass capacitor as described in the BIAS Capacitor section. No external load should be applied to BIAS. Any load lowers the BIAS voltage, affecting the overall performance of the device. ______________________________________________________________________________________ 13 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Table 1. MAX9750 Maximum Gain Settings GAIN1 0 0 1 1 GAIN2 0 1 0 1 SPEAKER MODE GAIN (dB) MAX9750A 9 12 10.5 13.5 MAX9750B 15 18 16.5 19.5 MAX9750C 6 9 7.5 10.5 HEADPHONE MODE GAIN (dB) 0 0 3 3 Table 2. MAX9751 Gain Settings GAIN 0 1 SPEAKER MODE GAIN (dB) 10.5 9 HEADPHONE MODE GAIN (dB) 3 0 VREF DAC VOL MAX9750 HPVDD BEEP Input The MAX9750 features an audible alert beep input (BEEP) that accepts a mono system alert signal and mixes it into the stereo audio path. When the amplitude of VBEEP(OUT) exceeds 800mVP-P (Figure 8) and the frequency of the beep signal is greater than 300Hz, the beep signal is mixed into the active audio path (speaker or headphone). If the signal at VBEEP(OUT) is either <800mVP-P or <300Hz, the BEEP signal is not mixed into the audio path. The amplitude of the BEEP signal at the device output is roughly the amplitude of VBEEP(OUT) times the gain of the selected signal path. The input resistor (RB) sets the gain of the BEEP input amplifier, and thus the amplitude of VBEEP(OUT). Choose RB based on: RB VIN x RINT 0.8 Figure 6. Volume Control Circuit Input Multiplexer The MAX9751 features a 2:1 input multiplexer on each amplifier, allowing input selection between two stereo sources. The logic input IN1/2 controls both multiplexers. A logic high selects input IN_1 and a logic low selects input IN_2. Shutdown The MAX9750/MAX9751/MAX9755 features a 0.2A, low-power shutdown mode that reduces quiescent current consumption and extends battery life. Driving SHDN low disables the drive amplifiers, bias circuitry, and charge pump, and drives BIAS and all outputs to GND. Connect SHDN to VDD for normal operation. where RINT is the value of the BEEP amplifier feedback resistor (47k) and VIN is the BEEP input amplitude. Note that the BEEP amplifier can be set up as either an attenuator, if the original alert signal amplitude is too large, or set to gain up the alert signal if it is below 800mVP-P. AC couple the alert signal to BEEP. Choose the value of the coupling capacitor as described in the Input Filtering section. Multiple beep inputs can be summed (Figure 8). Click-and-Pop Suppression Speaker Amplifier The MAX9750/MAX9751/MAX9755 speaker amplifiers feature Maxim's comprehensive, industry-leading clickand-pop suppression. During startup, the click-pop suppression circuitry eliminates any audible transient sources internal to the device. When entering shutdown, both amplifier outputs ramp to GND quickly and simultaneously. 14 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Table 3a. MAX9750A Volume Levels VVOL (V) VMIN* 0 0.49 0.5673 0.6447 0.722 0.7994 0.8767 0.9541 1.0314 1.1088 1.1861 1.2635 1.3408 1.4182 1.4955 1.5728 1.6502 1.7275 1.8094 1.8822 1.9596 2.0369 2.1143 2.1916 2.269 2.3463 2.4237 2.501 2.5783 2.6557 2.733 2.8104 VMAX* 0.49 0.5673 0.6447 0.722 0.7994 0.8767 0.9541 1.0314 1.1088 1.1861 1.2635 1.3408 1.4182 1.4955 1.5728 1.6502 1.7275 1.8049 1.8822 1.9596 2.0369 2.1143 2.1916 2.269 2.3463 2.4237 2.501 2.5783 2.6557 2.733 2.8104 3.3 HPVDD* 0.074 0.160 0.183 0.207 0.230 0.253 0.277 0.300 0.324 0.347 0.371 0.394 0.418 0.441 0.464 0.488 0.511 0.535 0.558 0.582 0.605 0.628 0.652 0.675 0.699 0.722 0.746 0.769 0.793 0.816 0.839 0.858 GAIN1 = 0, GAIN2 = 0 9 8 7 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 -32 -34 -38 -42 -46 -50 -54 -58 -62 MUTE SPEAKER MODE GAIN (dB) GAIN1 = 1, GAIN2 = 0 10.5 10 9 8 7 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 -32 -34 -38 -42 -46 -50 -54 MUTE GAIN1 = 0, GAIN2 = 1 12 11.5 11 10.5 10 9 8 7 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 -32 -34 -38 -42 MUTE GAIN1 = 1 GAIN2 = 1 13.5 13 12.5 12 11.5 11 10.5 10 9 8 7 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 -32 MUTE HEADPHONE MODE GAIN (dB) GAIN1 = X, GAIN2 = 0 0 -1 -2 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -3 -47 -51 -55 -59 -63 -67 -71 MUTE GAIN1 = X, GAIN2 = 1 3 2.5 2 1.5 1 0 -2 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -43 -47 -51 MUTE *Based on HPVDD = 3.3V X = Don't care. ______________________________________________________________________________________ 15 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Table 3B. MAX9750B Volume Levels VVOL (V) VMIN* 0 0.49 0.5673 0.6447 0.722 0.7994 0.8767 0.9541 1.0314 1.1088 1.1861 1.2635 1.3408 1.4182 1.4955 1.5728 1.6502 1.7275 1.8049 1.8822 1.9596 2.0369 2.1143 2.1916 2.269 2.3463 2.4237 2.501 2.5783 2.6557 2.733 2.8104 VMAX* 0.49 0.5673 0.6447 0.722 0.7994 0.8767 0.9541 1.0314 1.1088 1.1861 1.2635 1.3408 1.4182 1.4955 1.5728 1.6502 1.7275 1.8049 1.8822 1.9596 2.0369 2.1143 2.1916 2.269 2.3463 2.4237 2.501 2.5783 2.6557 2.733 2.8104 3.3 HPVDD* 0.074 0.160 0.183 0.207 0.230 0.253 0.277 0.300 0.324 0.347 0.371 0.394 0.418 0.441 0.464 0.488 0.511 0.535 0.558 0.582 0.605 0.628 0.652 0.675 0.699 0.722 0.746 0.769 0.793 0.816 0.839 0.858 GAIN1 = 0, GAIN2 = 0 15 14 13 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -32 -36 -40 -44 -48 -52 -56 MUTE SPEAKER MODE GAIN (dB) GAIN1 = 1, GAIN2 = 0 16.5 16 15 14 13 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -32 -36 -40 -44 -48 MUTE GAIN1 = 0, GAIN2 = 1 18 17.5 17 16.5 16 15 14 13 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -32 -36 MUTE GAIN1 = 1 GAIN2 = 1 19.5 19 18.5 18 17.5 17 16.5 16 15 14 13 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 MUTE HEADPHONE MODE GAIN (dB) GAIN1 = X, GAIN2 = 0 0 -1 -2 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -43 -47 -51 -55 -59 -63 -67 -71 MUTE GAIN1 = X, GAIN2 = 1 3 2.5 2 1.5 1 0 -1 -2 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -43 -47 -51 MUTE *Based on HPVDD = 3.3V X = Don't care. 16 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Table 3C. MAX9750C Volume Levels VVOL (V) VMIN* 0 0.49 0.5673 0.6447 0.722 0.7994 0.8767 0.9541 1.0314 1.1088 1.1861 1.2635 1.3408 1.4182 1.4955 1.5728 1.6502 1.7275 1.8049 1.8822 1.9596 2.0369 2.1143 2.1916 2.269 2.3463 2.4237 2.501 2.5783 2.6557 2.733 2.8104 VMAX* 0.49 0.5673 0.6447 0.722 0.7994 0.8767 0.9541 1.0314 1.1088 1.1861 1.2635 1.3408 1.4182 1.4955 1.5728 1.6502 1.7275 1.8049 1.8822 1.9596 2.0369 2.1143 2.1916 2.269 2.3463 2.4237 2.501 2.5783 2.6557 2.733 2.8104 3.3 HPVDD* 0.074 0.160 0.183 0.207 0.230 0.253 0.277 0.300 0.324 0.347 0.371 0.394 0.418 0.441 0.464 0.488 0.511 0.535 0.558 0.582 0.605 0.628 0.652 0.675 0.699 0.722 0.746 0.769 0.793 0.816 0.839 0.858 GAIN1 = 0, GAIN2 = 0 6 5 4 3 1 -1 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -41 -45 -48 -53 -57 -61 -65 MUTE SPEAKER MODE GAIN (dB) GAIN1 = 1, GAIN2 = 0 7.5 7 6 5 4 3 1 -1 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -3 -35 -37 -41 -45 -49 -53 -57 MUTE GAIN1 = 0, GAIN2 = 1 9 8.5 8 7.5 7 6 5 4 3 1 -1 -3 -5 -7 -9 -11 -13 -15 -17 -9 -21 -23 -2 -27 -29 -31 -33 -35 -37 -41 -45 MUTE GAIN1 = 1 GAIN2 = 1 10.5 10 9.5 9 8.5 8 7.5 7 6 5 4 3 1 -1 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 MUTE HEADPHONE MODE GAIN (dB) GAIN1 = X, GAIN2 = 0 0 -1 -2 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -43 -47 -51 -55 -59 -63 -67 -71 MUTE GAIN1 = X, GAIN2 = 1 3 2.5 2 1.5 1 0 -1 -2 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -43 -47 -51 MUTE *Based on HPVDD = 3.3V X = Don't care. ______________________________________________________________________________________ 17 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 MAX9750A VOLUME CONTROL TRANSFER FUNCTION 20 10 0 -10 GAIN (dB) -20 -30 -40 -50 -60 -70 -80 0 0.5 1.0 1.5 2.0 VVOL (V) 2.5 3.0 3.5 4.0 HEADPHONE MODE SPEAKER MODE GAIN (dB) AUDIO TAPER GAIN1 = GAIN2 = 0 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 0 0.5 1.0 1.5 2.0 VVOL (V) 2.5 3.0 3.5 4.0 HEADPHONE MODE AUDIO TAPER GAIN1 = GAIN2 = 0 SPEAKER MODE MAX9750B VOLUME CONTROL TRANSFER FUNCTION Figure 7a. Volume Control Transfer Function MAX9750C VOLUME CONTROL TRANSFER FUNCTION 20 10 0 -10 GAIN (dB) -20 -30 -40 -50 -60 -70 -80 0 0.5 1.0 1.5 2.0 VVOL (V) 2.5 3.0 3.5 4.0 HEADPHONE MODE AUDIO TAPER SPEAKER MODE GAIN1 = GAIN2 = 0 Figure 7b. Volume Control Transfer Function Figure 7c. Volume Control Transfer Function RS1 47k RINT 47k 0.47F SOURCE 2 0.47F SOURCE 3 RS3 47k BEEP RS2 47k Headphone Amplifier In conventional single-supply headphone amplifiers, the output-coupling capacitor is a major contributor of audible clicks and pops. Upon startup, the amplifier charges the coupling capacitor to its bias voltage, typically half the supply. Likewise, during shutdown, the capacitor is discharged to GND. A DC shift across the capacitor results, which in turn appears as an audible transient at the speaker. Since the MAX9750/MAX9751/ MAX9755 do not require output-coupling capacitors, no audible transient occurs. Additionally, the MAX9750/MAX9751/MAX9755 features extensive click-and-pop suppression that eliminates any audible transient sources internal to the device. The Power-Up/Down Waveform in the Typical Operating Characteristics shows that there are minimal spectral components in the audible range at the output upon startup and shutdown. 0.47F SOURCE 1 VOUT(BEEP) SPEAKER/HEADPHONE AMPLIFER INPUTS WINDOW DETECTOR (0.3VP-P THRESHOLD) BIAS FREQUENCY DETECTOR (300Hz THRESHOLD) MAX9750 Figure 8. Beep Input 18 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 1000 100 +1 VOUT(P-P) VDD = 5V RL = 16 AV = 3dB 10 THD+N (%) OUTPUTS IN PHASE 1 0.1 2 x VOUT(P-P) -1 VOUT(P-P) 0.01 0.001 0 25 OUTPUTS 180 OUT OF PHASE 50 75 100 125 150 OUTPUT POWER (mW) Figure 9. Bridge-Tied Load Configuration Figure 10. Total Harmonic Distortion Plus Noise vs. Output Power with Inputs In/Out of Phase (Headphone Mode) Applications Information BTL Speaker Amplifiers The MAX9750/MAX9751/MAX9755 feature speaker amplifiers designed to drive a load differentially, a configuration referred to as bridge-tied load (BTL). The BTL configuration (Figure 9) offers advantages over the single-ended configuration, where one side of the load is connected to ground. Driving the load differentially doubles the output voltage compared to a singleended amplifier under similar conditions. Thus, the device's differential gain is twice the closed-loop gain of the input amplifier. The effective gain is given by: A VD = 2 x RF RIN Power Dissipation and Heat Sinking Under normal operating conditions, the MAX9750/ MAX9751/MAX9755 can dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute Maximum Ratings under Continuous Power Dissipation, or can be calculated by the following equation: PDISSPKG(MAX) = TJ(MAX) - TA JA Substituting 2 X VOUT(P-P) into the following equation yields four times the output power due to double the output voltage: VRMS = VOUT(P-P) 22 where TJ(MAX) is +150C, TA is the ambient temperature, and JA is the reciprocal of the derating factor in C/W as specified in the Absolute Maximum Ratings section. For example, JA of the thin QFN package is +42C/W. For optimum power dissipation, the exposed paddle of the package should be connected to the ground plane (see the Layout and Grounding section). Output Power (Speaker Amplifier) The increase in power delivered by the BTL configuration directly results in an increase in internal power dissipation over the single-ended configuration. The maximum power dissipation for a given VDD and load is given by the following equation: PDISS(MAX) = 2VDD2 2RL 2 V POUT = RMS RL Since the differential outputs are biased at midsupply, there is no net DC voltage across the load. This eliminates the need for DC-blocking capacitors required for single-ended amplifiers. These capacitors can be large and expensive, can consume board space, and can degrade low-frequency performance. If the power dissipation for a given application exceeds the maximum allowed for a given package, either reduce VDD, increase load impedance, decrease the ambient temperature, or add heatsinking to the device. Large output, supply, and ground PC board traces improve the maximum power dissipation in the package. 19 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Table 4. Suggested Capacitor Manufacturers SUPPLIER Taiyo Yuden TDK PHONE 800-348-2496 807-803-6100 FAX 847-925-0899 847-390-4405 www.t-yuden.com www.component.tdk.com WEBSITE Thermal-overload protection limits total power dissipation in these devices. When the junction temperature exceeds +160C, the thermal-protection circuitry disables the amplifier output stage. The amplifiers are enabled once the junction temperature cools by 15C. This results in a pulsing output under continuous thermal-overload conditions as the device heats and cools. f-3DB = 1 2RINCIN Output Power (Headphone Amplifier) The headphone amplifiers have been specified for the worst-case scenario--when both inputs are in phase. Under this condition, the drivers simultaneously draw current from the charge pump, leading to a slight loss in headroom of VSS. In typical stereo audio applications, the left and right signals have differences in both magnitude and phase, subsequently leading to an increase in the maximum attainable output power. Figure 10 shows the two extreme cases for in and out of phase. In reality, the available power lies between these extremes. RIN is the amplifier's internal input resistance value given in the Electrical Characteristics. Choose CIN such that f-3dB is well below the lowest frequency of interest. Setting f-3dB too high affects the amplifier's low-frequency response. Use capacitors with low-voltage coefficient dielectrics, such as tantalum or aluminum electrolytic. Capacitors with high-voltage coefficients, such as ceramics, may result in increased distortion at low frequencies. BIAS Capacitor BIAS is the output of the internally generated DC bias voltage. The BIAS bypass capacitor, CBIAS, improves PSRR and THD+N by reducing power supply and other noise sources at the common-mode bias node, and also generates the clickless/popless, startup/shutdown DC bias waveforms for the speaker amplifiers. Bypass BIAS with a 1F capacitor to GND. Charge-Pump Capacitor Selection Use capacitors with an ESR less than 100m for optimum performance. Low-ESR ceramic capacitors minimize the output resistance of the charge pump. For best performance over the extended temperature range, select capacitors with an X7R dielectric. Table 4 lists suggested manufacturers. Flying Capacitor (C1) The value of the flying capacitor (C1) affects the load regulation and output resistance of the charge pump. A C1 value that is too small degrades the device's ability to provide sufficient current drive, which leads to a loss of output voltage. Increasing the value of C1 improves load regulation and reduces the charge-pump output resistance to an extent. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics. Above 2.2F, the on-resistance of the switches and the ESR of C1 and C2 dominate. Power Supplies The MAX9750/MAX9751/MAX9755 have different supplies for each portion of the device, allowing for the optimum combination of headroom and power dissipation and noise immunity. The speaker amplifiers are powered from PVDD. PVDD ranges from 4.5V to 5.5V. The headphone amplifiers are powered from HPV DD and VSS. HPVDD is the positive supply of the headphone amplifiers and ranges from 3V to 5.5V. VSS is the negative supply of the headphone amplifiers. Connect VSS to CPV SS . The charge pump is powered by CPV DD . CPVDD ranges from 3V to 5.5V and should be the same potential as HPVDD. The charge pump inverts the voltage at CPVDD, and the resulting voltage appears at CPVSS. The remainder of the device is powered by VDD. Component Selection Input Filtering The input capacitor (CIN), in conjunction with the amplifier input resistance (RIN), forms a highpass filter that removes the DC bias from an incoming signal (see the Typical Application Circuit). The AC-coupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zero source impedance, the -3dB point of the highpass filter is given by: 20 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 22F OUTL+ 1F INL 1F INR OUTL- MAX9750 OUTR+ OUTR- 22F 20k 20k 10k 22nF 10k IN MAX9751/MAX9755 to provide the negative supply for the headphone amplifiers. It can also be used to power other devices within a design. Current draw from CPVSS should be limited to 5mA, exceeding this affects the operation of the headphone amplifier. A typical application is a negative supply to adjust the contrast of LCD modules. When considering the use of CPVSS in this manner, note that the charge-pump voltage of CPVSS is roughly proportional to CPVDD and is not a regulated voltage. The charge-pump output impedance plot appears in the Typical Operating Characteristics. MAX9750/MAX9751/MAX9755 Layout and Grounding Proper layout and grounding are essential for optimum performance. Use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance, as well as route head away from the device. Good grounding improves audio performance, minimizes crosstalk between channels, and prevents any switching noise from coupling into the audio signal. Connect CPGND, PGND and GND together at a single point on the PC board. Route CPGND and all traces that carry switching transients away from GND, PGND, and the traces and components in the audio signal path. Connect all components associated with the charge pump (C2 and C3) to the CPGND plane. Connect VSS and CPVSS together at the device. Place the chargepump capacitors (C1, C2, and C3) as close to the device as possible. Bypass HPVDD and PVDD with a 0.1F capacitor to GND. Place the bypass capacitors as close to the device as possible. Use large, low-resistance output traces. As load impedance decreases, the current drawn from the device outputs increase. At higher current, the resistance of the output traces decrease the power delivered to the load. For example, when compared to a 0 trace, a 100m trace reduces the power delivered to a 4 load from 2.1W to 2W. Large output, supply, and GND traces also improve the power dissipation of the device. The MAX9750/MAX9751/MAX9755 thin QFN and TSSOP-EP packages feature exposed thermal pads on their undersides. This pad lowers the package's thermal resistance by providing a direct heat conduction path from the die to the printed circuit board. Connect the exposed thermal pad to GND by using a large pad and multiple vias to the GND plane. 10nF MAX9711 OUTOUT+ Figure 11. Stereo Plus Subwoofer Application Circuit Output Capacitor (C2) The output capacitor value and ESR directly affect the ripple at CPVSS. Increasing the value of C2 reduces output ripple. Likewise, decreasing the ESR of C2 reduces both ripple and output resistance. Lower capacitance values can be used in systems with low maximum output power levels. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics. CPVDD Bypass Capacitor The CPVDD bypass capacitor (C3) lowers the output impedance of the power supply and reduces the impact of the MAX9750/MAX9751/MAX9755's chargepump switching transients. Bypass CPVDD with C3, the same value as C1, and place it physically close to CPVDD and PGND (refer to the MAX9750 Evaluation Kit for a suggested layout). Powering Other Circuits from a Negative Supply An additional benefit of the MAX9750/MAX9751/ MAX9755 is the internally generated negative supply voltage (CPV SS ). CPV SS is used by the MAX9750/ ______________________________________________________________________________________ 21 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Simplified Block Diagrams (continued) MUX MAX9751 MAX9755 22 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Block Diagrams 4.5V TO 5.5V MAX9750/MAX9751/MAX9755 0.1F VDD 25 (1) MAX9750 CIN 1F LEFT-CHANNEL AUDIO INPUT 1 INL (5) 4 (8) OUTL+ 5 (9) OUTL6, 16 (10, 20) PVDD 4.5V TO 5.5V 0.1F GAIN/ VOLUME CONTROL BTL AMPLIFIER CIN 1F RIGHT-CHANNEL AUDIO INPUT 27 INR (3) 21 BIAS (25) 28 VOL (4) GAIN/ VOLUME CONTROL BTL AMPLIFIER 18 (22) OUTR+ 17 (21) OUTR- CBIAS 1F VDD GAIN1 VDD GAIN2 0.47F 47k BEEP VDD SHDN 3V TO 5.5V 1F 24 (28) 23 (27) 2 (6) 22 (26) GAIN/ VOLUME CONTROL HEADPHONE DETECTION BEEP DETECTION SHUTDOWN CONTROL 15 (19) HPVDD 20 (24) HPS 14 (18) HPOUTL 3V TO 5.5V 0.1F 7 CPVDD (11) 8 C1P (12) C1 10 1F (14) C1N 9 CPGND (13) 13 (17) HPOUTR CHARGE PUMP 11 12 (15) (16) CPVSS VSS C2 1F 26 (2) GND 3, 19 (7, 23) PGND ( ) TSSOP PIN. ______________________________________________________________________________________ 23 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Block Diagrams (continued) 4.5V TO 5.5V 0.1F VDD 25 (1) MAX9751 CIN LEFT CHANNEL 1F AUDIO INPUT CIN LEFT CHANNEL 1F AUDIO INPUT 1 INL1 (5) 2 INL2 (6) INPUT MUX BTL AMPLIFIER 4 (8) OUTL+ 5 (9) OUTL6, 16 (10, 20) PVDD 4.5V TO 5.5V 0.1F CIN RIGHT CHANNEL 1F AUDIO INPUT C IN RIGHT CHANNEL 1F AUDIO INPUT CBIAS 1F VDD VDD VDD 27 INR1 (3) 28 INR2 (4) 21 BIAS (25) INPUT MUX BTL AMPLIFIER 18 (22) OUTR+ 17 (21) OUTR- 15 (19) HPVDD MUX AND GAIN CONTROL HEADPHONE DETECTION SHUTDOWN CONTROL 20 (24) HPS 14 (18) HPOUTL 24 GAIN (28) 23 IN1/2 (27) 22 SHDN (26) 3V TO 5.5V 0.1F 3V TO 5.5V 1F 7 CPVDD (11) 8 C1P (12) C1 10 1F (14) C1N 9 CPGND (13) 13 (17) HPOUTR CHARGE PUMP 11 12 (15) (16) CVSS VSS C2 1F 26 (2) GND 3, 19 (7, 23) PGND ( ) TSSOP PIN. LOGIC PINS CONFIGURED FOR: GAIN = 1, 9dB SPEAKER GAIN/0dB HEADPHONE GAIN. IN1/2 = 1, SELECTED INPUT LINE 1. SHDN = 1, PART ACTIVE. 24 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Block Diagrams (continued) MAX9750/MAX9751/MAX9755 4.5V TO 5.5V 0.1F VDD 25 (1) MAX9755 CIN LEFT CHANNEL 1F AUDIO INPUT 2 INL (6) 4 (8) OUTL+ 5 (9) OUTL6, 16 (10, 20) PVDD 4.5V TO 5.5V 0.1F BTL AMPLIFIER CIN RIGHT CHANNEL 1F AUDIO INPUT 28 INR (4) 21 BIAS (25) BTL AMPLIFIER 18 (22) OUTR+ 17 (21) OUTR- CBIAS 1F VDD 24 GAIN (28) 15 (19) HPVDD GAIN CONTROL HEADPHONE DETECTION SHUTDOWN CONTROL 20 (24) HPS 14 (18) HPOUTL 3V TO 5.5V 0.1F VDD 22 SHDN (26) 3V TO 5.5V 1F 7 CPVDD (11) 8 C1P (12) C1 10 1F (14) C1N 9 CPGND (13) 13 (17) HPOUTR CHARGE PUMP 11 12 (15) (16) CPVSS VSS C2 1F 23, 26 (2, 27) GND 3, 19 (7, 23) PGND ( ) TSSOP PIN. LOGIC PINS CONFIGURED FOR: GAIN = 1, 9dB SPEAKER GAIN/0dB HEADPHONE GAIN. SHDN = 1, PART ACTIVE. ______________________________________________________________________________________ 25 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 System Diagrams 4.5V TO 5.5V 3V TO 5.5V 0.1F VDD BIAS 1F OUTLPVDD HPVDD OUTL+ 0.1F MAX9750 1F AUX_IN 1F OUT 2k CODEC 1F 33k BEEP HPOUTL HPOUTR SHDN 1F 1F IN+ INC GAIN1 GAIN2 3V TO 5.5V 1F 1F C1N GND PGND CPVDD C1P VOL CPVSS VSS CPGND 1F HPVDD INR HPS 1F INL OUTR+ OUTR- MAX4060 BIAS 2k 26 ______________________________________________________________________________________ 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers System Diagrams (continued) 4.5V TO 5.5V 3V TO 5.5V MAX9750/MAX9751/MAX9755 0.1F VDD 1F INL1 OUTLCODEC 1F AUX_IN 1F INR1 OUT 2k INR2 HPS HPOUTL HPOUTR OUTR+ OUTRINL2 PVDD HPVDD OUTL+ 0.1F MAX9751 MAX4060 BIAS SHDN 2k 1F 1F IN+ 3V TO 5.5V IN1F 1F C1N C IN1/2 GAIN CPVDD C1P CPVSS VSS CPGND BIAS GND PGND 1F 1F Chip Information MAX9750 TRANSISTOR COUNT: 9591 MAX9751 TRANSISTOR COUNT: 8632 MAX9755 TRANSISTOR COUNT: 7834 PROCESS: BiCMOS ______________________________________________________________________________________ 27 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Pin Configurations TOP VIEW VDD 1 GND 2 INR 3 VOL 4 INL 5 BEEP 6 PGND 7 OUTL+ 8 OUTL- 9 PVDD 10 CPVDD 11 C1P 12 CPGND 13 C1N 14 28 GAIN1 27 GAIN2 26 SHDN 25 BIAS 24 HPS VDD 1 GND 2 INR1 3 INR2 4 INL1 5 INL2 6 PGND 7 OUTL+ 8 OUTL- 9 PVDD 10 CPVDD 11 C1P 12 CPGND 13 C1N 14 28 GAIN1 27 IN1/2 26 SHDN 25 BIAS 24 HPS VDD 1 GND 2 N.C. 3 INR 4 N.C. 5 INL 6 PGND 7 OUTL+ 8 OUTL- 9 PVDD 10 CPVDD 11 C1P 12 CPGND 13 C1N 14 28 GAIN1 27 GND 26 SHDN 25 BIAS 24 HPS MAX9750 23 PGND 22 OUTR+ 21 OUTR20 PVDD 19 HPVDD 18 HPOUTL 17 HPOUTR 16 VSS 15 CPVSS MAX9751 23 PGND 22 OUTR+ 21 OUTR20 PVDD 19 HPVDD 18 HPOUTL 17 HPOUTR 16 VSS 15 CPVSS MAX9755 23 PGND 22 OUTR+ 21 OUTR20 PVDD 19 HPVDD 18 HPOUTL 17 HPOUTR 16 VSS 15 CPVSS TSSOP-EP GAIN1 GAIN2 SHDN GND VOL VDD TSSOP-EP INR2 INR1 GND VDD TSSOP-EP SHDN IN1/2 GAIN TOP VIEW INR 28 27 26 25 24 23 28 27 26 25 24 23 22 INL BEEP PGND OUTL+ OUTLPVDD CPVDD 1 2 3 4 5 6 7 10 11 12 13 14 8 9 21 20 19 BIAS HPS PGND OUTR+ OUTRPVDD HPVDD INL1 INL2 PGND OUTL+ OUTLPVDD CPVDD 1 2 3 4 5 6 7 10 11 12 13 14 8 9 22 21 20 19 BIAS HPS PGND OUTR+ OUTRPVDD HPVDD MAX9750 18 17 16 15 MAX9751 18 17 16 15 CPVSS HPOUTR HPOUTR HPOUTL 28 27 26 25 24 23 N.C. INL PGND OUTL+ OUTLPVDD CPVDD 1 2 3 4 5 6 7 10 11 12 13 14 8 9 22 SHDN THIN QFN GAIN GND GND N.C. VDD INR THIN QFN 21 20 19 BIAS HPS PGND OUTR+ OUTRPVDD HPVDD MAX9755 18 17 16 15 CPGND C1P CPVSS THIN QFN 28 ______________________________________________________________________________________ HPOUTR HPOUTL C1N VSS HPOUTL CPGND C1P C1N CPGND CPVSS C1P C1N VSS VSS 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) QFN THIN.EPS MAX9750/MAX9751/MAX9755 0.15 C A D2 C L D b D2/2 0.10 M C A B PIN # 1 I.D. D/2 0.15 C B k PIN # 1 I.D. 0.35x45 E/2 E2/2 E (NE-1) X e C L E2 k L DETAIL A e (ND-1) X e C L C L L e 0.10 C A 0.08 C e L C A1 A3 PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm DOCUMENT CONTROL NO. REV. APPROVAL 21-0140 C 1 2 COMMON DIMENSIONS EXPOSED PAD VARIATIONS NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. 5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm FROM TERMINAL TIP. 6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. 7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. 8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 9. DRAWING CONFORMS TO JEDEC MO220. 10. WARPAGE SHALL NOT EXCEED 0.10 mm. PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm DOCUMENT CONTROL NO. REV. APPROVAL 21-0140 C 2 2 ______________________________________________________________________________________ 29 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750/MAX9751/MAX9755 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) TSSOP 4.4mm BODY.EPS PACKAGE OUTLINE, TSSOP, 4.40 MM BODY EXPOSED PAD 21-0108 C 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 30 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. 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