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| UNISONIC TECHNOLOGIES CO., LTD 3544 HEADPHONE AMPLIFIER FOR CD-ROMS DESCRIPTION As a dual headphone amplifier the UTC 3544 is digital-source. The UTC 3544 has a steady gain of 6dB and so it is unnecessary for external gain setting. The UTC 3544 has internal mute function so that it is greatly simplified for prevention of the popping sound when power is turned on and off. To prevent damage from short circuits the UTC 3544 is equipped with thermal shutdown circuit. LINEAR INTEGRATED CIRCUIT FEATURES * Internal mute function to prevent popping sounds when *the power is turned on and off. * Built-in thermal shutdown circuit (150C) to prevent *damage to the IC if a short circuit occurs. ORDERING INFORMATION Ordering Number Lead Free Halogen Free 3544L-D08-T 3544G-D08-T 3544L-S08-R 3544G-S08-R Package DIP-8 SOP-8 Packing Tube Tape Reel www.unisonic.com.tw Copyright (c) 2009 Unisonic Technologies Co., Ltd 1 of 9 QW-R107-040,C 3544 PIN DESCRIPTIONS PIN NO. PIN NAME I/O PIN VOLTAGE LINEAR INTEGRATED CIRCUIT INTERNAL EQUIVALENT CIRCUIT Vcc FUNCTION 1 OUT1 O 2.1V 1 Output pin 10k 7 OUT2 O 2.1V (VCC=5V) 7 2 MUTE I 0.1V (When open) Mute control pin (set to low for prevention of popping noise when power is turned on and off). Operating: High Muting: Low(open) Vcc 3 IN1 I 2.1V 3 Input pin 180k BIAS 5 IN2 I 2.1V (VCC=5V) 5 6 BIAS I/O 2.1V (VCC=5V) Bias pin (the external 47F capacitor also serves as the anti-pop time constant, therefore make the proper considerations be changing it). 4 8 GND VCC I I UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R107-040,C 3544 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 10 QW-R107-040,C 3544 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER Applied Voltage Power Dissipation Derate above 25C LINEAR INTEGRATED CIRCUIT SYMBOL VMAX PD RATINGS 7.0 450 UNIT V mW 4.5 mW/C Operating Temperature TOPR -25 ~ +75 C Storage Temperature TSTG -55 ~ +125 C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. RECOMMENDED OPERATING CONDITIONS (Ta=25C) PARAMETER Power Supply Voltage SYMBOL VCC MIN 2.8 TYP MAX 6.5 UNIT V ELECTRICAL CHARACTERISTICS (Ta=25C, VCC=5.0V, RL=32, VIN= -6dBV, f=1kHz) PARAMETER Mute Pin Control Voltage Quiescent Current Voltage Gain Voltage Gain Difference Between Channels Total Harmonic Distortion Rated Output 1 Rated Output 2 Output Noise Voltage Channel Separation Mute Attenuation Ripple Rejection SYMBOL VTM IQ Gv Gv(DIFF) THD Po1 Po2 eN CS ATT RR CONDITIONS VIN=0Vrms MIN 0.3 4 4 -0.5 25 50 82 70 50 TYP 0.7 7 6 0 0.02 31 62 -93 90 80 57 MAX 1.6 10 8 0.5 0.1 UNIT V mA dB dB % mW mW dBV dB dB dB BW=20~20kHz RL=32,THD<0.1% RL=16,THD<0.1% BW=20~20kHz,Rg=0 Rg=0 Rg=0 fRR=100Hz, VRR= -20dBV -85 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 10 QW-R107-040,C 3544 MEASUREMENT CIRCUIT 32 1 16 SW7 2 330 + LINEAR INTEGRATED CIRCUIT SW5 1 2 VIN2 V V2AC 1 47 + + A IQ SW8B 10 Vcc 8 OUT2 7 BIAS 6 BIAS 6dB IN2 5 TSD SW8A VRR 6dB 1 2 + MUTE Vcc 32 SW1 16 1 2 V1AC V + 90K + 90K 1 OUT1 VTM 2 MUTE 3 IN1 1 1 2 4 GND 330 SW3 VIN1 MEASUREMENT CONDITIONS SIGNAL IQ VTM GVC Gvc THD Po1 Po2 VNO CS 1 1 2 1 1 1 1 1 2 2 2 1 1 2 2 1 2 2 2 1 2 1 2 1 1 1 2 1 1 1 1 1 2 2 2 2 2 2 2 1 ON ON ON ON ON ON ON ON V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC fin=1kHz,VIN2= -6dBV, VTM=1.6V fin=1kHz,VIN1= -6dBV, VTM=1.6V fin=1kHz,VIN1/2= -6dBV, VTM=0.3VB VRR= -20dBV, fRR=100Hz 5 of 10 QW-R107-040,C SW1 1 1 SW3 1 2 SW TABLE SW5 SW7 1 1 2 1 SW8A 2 2 SW8B OFF ON MONITOR IQ V1AC,V2AC CONDITIONS f=1kHz,VIN1/2=-6dBV, VTM=1.6V GVC1 - GVC2 fin=1kHz,VIN1/2= -6dBV, VTM=1.6V fin=1kHz,VIN1/2= -6dBV, VTM=1.6V fin=1kHz,VIN1/2= -6dBV, VTM=1.6V ATT RR UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3544 CIRCUIT OPERATION Rising edge timing LINEAR INTEGRATED CIRCUIT Rising period A Play period A Descending period Vcc B C OUT VMUTE A: MUTE period(use with MUTE=Low to prevent the popping noise when the power is turned on and off ). B: MUTE release time(used to prevent the popping noise at the release of MUTE with the external C 2 and R2 and therefore possesses a time constant ,so be careful of the timing). C: MUTE start time(also possesses a time constant like the MUTE release time ). UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 10 QW-R107-040,C 3544 APPLICATION EXAMPLE LINEAR INTEGRATED CIRCUIT C6 Vcc + 330 + Vcc C1 8 OUT2 7 + 47 BIAS IN2 5 BIAS 1 VIN2 C3 6 TSD 6dB 90K + 6dB + 90K MUTE C7 + 330 VMUTE H:Active L:Mute 1 OUT1 2 MUTE 3 IN1 4 GND 1 VIN1 R2 100k C2 1 C5 EXPLANATION OF EXTERNAL COMPONENTS (1)Input coupling capacitor (C3 and C5) First determined by the low-band cut-off frequency. Because the input impedance is 180k for this IC, it can be determined by this formula C3(C5)=1/(2x180kxf) But make sure taking the fluctuations, ambient temperature, etc into consideration. A multi-layered ceramic capacitor is recommended. (2)BIAS capacitor(C6) 47F when Vcc=5V, and 33F when Vcc=3V. Before changing these values take the sufficient considerations.It is because the electrical characteristics will be adversely affected and popping noise may occur if the capacitance is lowered too much. (3)MUTE pin for anti-pop measures (R2 and C2) An impedance of 190k must be possessed with respect to GND, so the MUTE mode may become unable to be released if R2 is increased too much. (4)Output coupling capacitor(C1 and C7) Also determined by the low-band cutoff frequency. Like the output load resistance value RL (a resistor Rx will be inserted ,assuming that for output protection or current limiting), it can be calculated by this formula C1(C7)=1/(2x(RL+Rx) xf) (5)Input gain adjustment resistor(R3 and R4) External resistors R3 and R4 can perform input gain adjustment .The desired gain can be calculated by this formula Gv=6+20log(90k/(90k+R3))[dB] UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R107-040,C 3544 TYPICAL CHARACTERISTICS Quiescent Current vs. Power Supply Voltage 10 9 Quiescent Current, IQ (mA) LINEAR INTEGRATED CIRCUIT Pin DC Current vs. Power Supply Voltage 5 Ta=25 RL=32 5 Ta=25 RL=32 Bias DC Voltage, VBIAS (V) 7 6 5 4 3 2 1 0 MUTE: OFF 3 3 2 2 MUTE: ON 1 1 0 0 2 4 6 8 10 0 2 4 6 8 10 Supply Voltage, Vcc (V) Output Voltage vs. Mute Control Voltage Supply Voltage, Vcc(V) Voltage Gain vs. Frequency 8 Ta=25 RL=32 Vcc=5V VIN=0dBV f=1kHz 6 4 Voltage Gain, Gv (dB) 2 0 -2 -4 -6 -8 -10 0 0.4 0.8 1.2 1.6 2 -12 10 100 1k Frequency, F(Hz) Ta=25 RL=32 Vcc=5V 10k 0 10 0 Output Voltage, VOUT (dBV) -10 -20 -30 -40 -50 -60 -70 -80 -90 100k Mute Control Voltage, VTM (V) Total Harmonic Distortion vs. Output Voltage ( I ) 10 Ta=25 RL=32 Vcc=5V 1 f=10kHz 0.1 f=1kHz 0.01 f=100Hz 0.001 -40 -10 0 -30 -20 Output Voltage, VOUT (dBV) 10 Total Harmonic Distortion vs. Output Voltage ( II ) 10 Ta=25 RL=32 Vcc=3V 1 f=10kHz 0.1 f=1kHz 0.01 f=100Hz 0.001 -40 -30 -10 0 -20 Output Voltage, VOUT (dBV) 10 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 10 QW-R107-040,C Output DC Voltage, VOUT (V) 8 4 4 3544 TYPICAL CHARACTERISTICS(Cont.) LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R107-040,C |
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