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19-1522; Rev 2; 1/00 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs General Description The MAX4450 single and MAX4451 dual op amps are unity-gain-stable devices that combine high-speed performance with Rail-to-Rail(R) outputs. Both devices operate from a +4.5V to +11V single supply or from 2.25V to 5.5V dual supplies. The common-mode input voltage range extends beyond the negative power-supply rail (ground in single-supply applications). The MAX4450/MAX4451 require only 6.5mA of quiescent supply current per op amp while achieving a 210MHz -3dB bandwidth and a 485V/s slew rate. Both devices are an excellent solution in low-power/lowvoltage systems that require wide bandwidth, such as video, communications, and instrumentation. The MAX4450 is available in the ultra-small 5-pin SC70 package, while the MAX4451 is available in a spacesaving 8-pin SOT23. Features o Ultra-Small SC70-5, SOT23-5, and SOT23-8 Packages o Low Cost o High Speed 210MHz -3dB Bandwidth 55MHz 0.1dB Gain Flatness 485V/s Slew Rate o Single +4.5V to +11V Operation o Rail-to-Rail Outputs o Input Common-Mode Range Extends Beyond VEE o Low Differential Gain/Phase: 0.02%/0.08 o Low Distortion at 5MHz -65dBc SFDR -63dB Total Harmonic Distortion MAX4450/MAX4451 Applications Set-Top Boxes Surveillance Video Systems Battery-Powered Instruments Video Line Driver Analog-to-Digital Converter Interface CCD Imaging Systems Video Routing and Switching Systems Digital Cameras Ordering Information PART MAX4450EXK-T MAX4450EUK-T MAX4451EKA-T MAX4451ESA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SC70-5 5 SOT23-5 8 SOT23-8 8 SO TOP MARK AAA ADKP AAAA -- Typical Operating Circuit RF 24 RTO 50 MAX4450 IN RTIN 50 UNITY-GAIN LINE DRIVER (RL = RO + RTO) ZO = 50 RO 50 Pin Configurations TOP VIEW OUT 1 5 VCC VOUT VEE 2 MAX4450 IN+ 3 4 IN- SC70-5/SOT23-5 Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE)................................................+12V IN_-, IN_+, OUT_..............................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Current to VCC or VEE ......................150mA Continuous Power Dissipation (TA = +70C) 5-Pin SC70-5 (derate 2.5mW/C above +70C) ..........200mW 5-Pin SOT23-5 (derate 7.1mW/C above +70C) ........571mW 8-Pin SOT23-8 (derate 5.26mW/C above +70C) ......421mW 8-Pin SO (derate 5.9mW/C above +70C) .................471mW 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 at 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. (VCC = +5V, VEE = 0, RL = to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Input Common-Mode Voltage Range Input Offset Voltage (Note 2) Input Offset Voltage Matching Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Open-Loop Gain (Note 2) TCVOS IB IOS RIN CMRR AVOL (Note 2) (Note 2) Differential mode (-1V VIN +1V) Common mode (-0.2V VCM +2.75V) (VEE - 0.2V) VCM (VCC - 2.25V) 0.25V VOUT 4.75V, RL = 2k 0.5V VOUT 4.5V, RL = 150 1V VOUT 4V, RL = 50 RL = 2k RL = 150 VOUT RL = 75 RL = 75 to ground Output Current Output Short-Circuit Current Open-Loop Output Resistance Power-Supply Rejection Ratio (Note 3) Operating Supply-Voltage Range Quiescent Supply Current (per amplifier) 2 IOUT ISC ROUT PSRR VS IS VCC = 5V VCC to VEE VEE = 0, VCM = 2V VEE = -5V, VCM = 0 46 54 4.5 6.5 RL = 50 Sinking or sourcing VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE Sourcing Sinking 45 25 70 50 48 SYMBOL VCM VOS CONDITIONS Guaranteed by CMRR test MIN VEE 0.20 4 1.0 8 6.5 0.5 70 3 95 60 58 57 0.05 0.05 0.30 0.25 0.5 0.5 1.0 0.025 70 50 120 8 62 69 11.0 9.0 0.20 0.15 0.50 0.80 0.80 1.75 1.5 0.065 mA mA dB V mA V dB 20 4 TYP MAX VCC 2.25 26 UNITS V mV mV V/C A A k M dB DC ELECTRICAL CHARACTERISTICS Output Voltage Swing (Note 2) _______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 AC ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = 0, VCM = +2.5V, RF = 24, RL = 100 to VCC/2, VOUT = VCC/2, AVCL = +1V/V, TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth Bandwidth for 0.1dB Gain Flatness Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range SYMBOL BWSS BWLS BW0.1dB SR tS tR, tF SFDR VOUT = 2Vp-p VOUT = 100mVp-p VOUT = 2V step VOUT = 2V step VOUT = 100mVp-p fC = 5MHz, VOUT = 2Vp-p 2nd harmonic Harmonic Distortion HD fC = 5MHz, VOUT = 2Vp-p 3rd harmonic Total harmonic distortion CONDITIONS VOUT = 100mVp-p MIN TYP 210 175 55 485 16 4 -65 -65 -58 -63 66 102 14 0.08 0.02 10 1.8 1 f = 10MHz 1.5 dBc dB dBm degrees % nV/Hz pA/Hz pF dBc MAX UNITS MHz MHz MHz V/s ns ns dBc Two-Tone, Third-Order Intermodulation Distortion Channel-to-Channel Isolation Input 1dB Compression Point Differential Phase Error Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance Output Impedance IP3 CHISO DP DG en in CIN ZOUT f1 = 4.7MHz, f2 = 4.8MHz, VOUT = 1Vp-p Specified at DC fC = 10MHz, AVCL = +2V/V NTSC, RL = 150 NTSC, RL = 150 f = 10kHz f = 10kHz Note 1: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: Tested with VCM = +2.5V. Note 3: PSR for single +5V supply tested with VEE = 0, VCC = +4.5V to +5.5V; PSR for dual 5V supply tested with VEE = -4.5V to -5.5V, VCC = +4.5V to +5.5V. _______________________________________________________________________________________ 3 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Typical Operating Characteristics (VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) SMALL-SIGNAL GAIN vs. FREQUENCY MAX4450-01 LARGE-SIGNAL GAIN vs. FREQUENCY MAX4450-02 GAIN FLATNESS vs. FREQUENCY 0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 VOUT = 100mVp-p MAX4450-03 4 3 2 1 GAIN (dB) VOUT = 100mVp-p 4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p 0.4 0 -1 -2 -3 -4 -5 -6 100k 1M 10M FREQUENCY (Hz) 100M 1G 100k 1M 10M FREQUENCY (Hz) 100M 1G 100k 1M 10M FREQUENCY (Hz) 100M 1G OUTPUT IMPEDANCE vs. FREQUENCY MAX4450-04 DISTORTION vs. FREQUENCY MAX4450-05 DISTORTION vs. FREQUENCY -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p AVCL = +2V/V MAX4450-06 100 0 -10 -20 VOUT = 2Vp-p AVCL = +1V/V 0 10 DISTORTION (dBc) IMPEDANCE () -30 -40 -50 -60 -70 -80 -90 3RD HARMONIC 2ND HARMONIC 1 0.1 -80 -90 -100 0.01 100k 1M 10M FREQUENCY (Hz) 100M 1G -100 100k 1M 10M 100M FREQUENCY (Hz) 100k 1M 10M 100M FREQUENCY (Hz) DISTORTION vs. FREQUENCY MAX4450-07 DISTORTION vs. RESISTIVE LOAD MAX4450-08 DISTORTION vs. VOLTAGE SWING -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 2ND HARMONIC 3RD HARMONIC fO = 5MHz AVCL = +1V/V MAX4450-09 0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 100k 1M 10M 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p AVCL = +5V/V 0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 2ND HARMONIC fO = 5MHz VOUT = 2Vp-p AVCL = +1V/V 0 -90 -100 800 1000 1200 0.5 1.0 1.5 2.0 100M 0 200 400 600 RLOAD () FREQUENCY (Hz) VOLTAGE SWING (Vp-p) 4 _______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) DIFFERENTIAL GAIN AND PHASE MAX4450-10 COMMON-MODE REJECTION vs. FREQUENCY MAX4450-11 POWER-SUPPLY REJECTION vs. FREQUENCY -10 -20 -30 PSR (dB) -40 -50 -60 -70 -80 -90 MAX4450-12 0 -10 -20 -30 DIFF GAIN (%) 0 0.12 0.10 0.08 0.06 0.04 0.02 0 -0.02 -0.04 0 DIFF PHASE (degrees) IRE 100 CMR (dB) 0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010 0 -40 -50 -60 -70 -80 -90 -100 IRE 100 100k 1M 10M FREQUENCY (Hz) 100M 1G -100 100k 1M 10M FREQUENCY (Hz) 100M 1G OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD MAX4450-13 SMALL-SIGNAL PULSE RESPONSE MAX4450-14 SMALL-SIGNAL PULSE RESPONSE MAX4450-15 1.6 1.4 OUTPUT VOLTAGE SWING (V) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 VOL - VEE VCC - VOH INPUT 50mV/div VOLTAGE (V) INPUT 25mV/div VOLTAGE (V) OUTPUT 50mV/div OUTPUT 50mV/div RF = 24 AVCL = +1V/V RF = 500 AVCL = +2V/V 20ns/div 20ns/div 50 100 150 200 250 300 350 400 450 500 RLOAD () SMALL-SIGNAL PULSE RESPONSE MAX4450-16 LARGE-SIGNAL PULSE RESPONSE MAX4450-17 LARGE-SIGNAL PULSE RESPONSE MAX4450-18 INPUT 10mV/div VOLTAGE (V) INPUT 1V/div VOLTAGE (V) INPUT 500mV/div VOLTAGE (V) OUTPUT 1V/div OUTPUT 50mV/div RF = 500 AVCL = +5V/V 20ns/div OUTPUT 1V/div RF = 24 AVCL = +1V/V 20ns/div RF = 500 AVCL = +2V/V 20ns/div _______________________________________________________________________________________ 5 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) LARGE-SIGNAL PULSE RESPONSE MAX4450-19 VOLTAGE NOISE vs. FREQUENCY MAX4450-20 CURRENT NOISE vs. FREQUENCY MAX4450-21 100 100 VOLTAGE NOISE (pA/Hz) CURRENT NOISE (pA/Hz) INPUT 1V/div VOLTAGE (V) 10 10 INPUT 1V/div RF = 500 AVCL = +2V/V RL = 100 1 20ns/div 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 1 1 RL = 100 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) ISOLATION RESISTANCE vs. CAPACITIVE LOAD MAX4450-22 SMALL-SIGNAL BANDWIDTH vs. LOAD RESISTANCE MAX4450-23 16 15 14 RISO () 13 12 11 10 LARGE SIGNAL (VOUT = 2Vp-p) 9 0 SMALL SIGNAL (VOUT = 100mVp-p) 300 250 BANDWIDTH (MHz) 200 150 100 50 0 50 100 150 200 250 300 350 400 450 500 CLOAD (pF) 0 100 200 300 400 500 600 700 800 RLOAD () OPEN-LOOP GAIN vs. RESISTIVE LOAD MAX4450-24 MAX4451 CROSSTALK vs. FREQUENCY 40 20 MAX4450-25 80 70 OPEN-LOOP GAIN (dBc) 60 50 40 30 20 10 0 100 1k RLOAD () 60 CROSSTALK (dB) 0 -20 -40 -60 -80 -100 -120 -140 10k 0.1M 1M 10M FREQUENCY (Hz) 100M 1G 6 _______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs Pin Description PIN MAX4450 1 2 3 4 5 -- -- -- -- -- -- MAX4451 -- 4 -- -- 8 1 2 3 7 6 5 NAME OUT VEE IN+ INVCC OUTA INAINA+ OUTB INBINB+ FUNCTION Amplifier Output Negative Power Supply or Ground (in singlesupply operation) Noninverting Input Inverting Input Positive Power Supply Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Amplifier B Output Amplifier B Inverting Input Amplifier B Noninverting Input RG RF Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values to fit your application. Large resistor values increase voltage noise and interact with the amplifier's input and PC board capacitance. This can generate undesirable poles and zeros and decrease bandwidth or cause oscillations. For example, a noninverting gain-of-two configuration (RF = RG) using 1k resistors, combined with 1pF of amplifier input capacitance and 1pF of PC board capacitance, causes a pole at 159MHz. Since this pole is within the amplifier bandwidth, it jeopardizes stability. Reducing the 1k resistors to 100 extends the pole frequency to 1.59GHz, but could limit output swing by adding 200 in parallel with the amplifier's load resistor. Table 1 lists suggested feedback and gain resistors, and bandwidths for several gain values in the configurations shown in Figures 1a and 1b. MAX4450/MAX4451 Layout and Power-Supply Bypassing These amplifiers operate from a single +4.5V to +11V power supply or from dual 2.25V to 5.5V supplies. For single-supply operation, bypass VCC to ground with a Detailed Description The MAX4450/MAX4451 are single-supply, rail-to-rail, voltage-feedback amplifiers that employ current-feedback techniques to achieve 485V/s slew rates and 210MHz bandwidths. Excellent harmonic distortion and differential gain/phase performance make these amplifiers an ideal choice for a wide variety of video and RF signal-processing applications. The output voltage swings to within 55mV of each supply rail. Local feedback around the output stage ensures low open-loop output impedance to reduce gain sensitivity to load variations. The input stage permits common-mode voltages beyond the negative supply and to within 2.25V of the positive supply rail. RTO MAX445 _ VOUT IN RTIN VOUT = [1+ (RF / RG)] VIN RO Figure 1a. Noninverting Gain Configuration RG IN RTIN RF Applications Information Choosing Resistor Values Unity-Gain Configuration The MAX4450/MAX4451 are internally compensated for unity gain. When configured for unity gain, the devices require a 24 resistor (RF) in series with the feedback path. This resistor improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance. RTO MAX445 _ VOUT VOUT = -(RF / RG) VIN RS RO Figure 1b. Inverting Gain Configuration 7 _______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Table 1. Recommended Component Values GAIN (V/V) COMPONENT +1 RF () RG () RS () RTIN () RTO () Small-Signal -3dB Bandwidth (MHz) 24 -- 49.9 49.9 210 -1 500 500 0 56 49.9 100 +2 500 500 -- 49.9 49.9 95 -2 500 250 0 62 49.9 50 +5 500 124 -- 49.9 49.9 25 -5 500 100 0 100 49.9 25 +10 500 56 -- 49.9 49.9 11 -10 500 50 0 49.9 15 +25 500 20 -- 49.9 49.9 5 -25 1200 50 0 49.9 10 Note: RL = RO + RTO; RTIN and RTO are calculated for 50 applications. For 75 systems, RTO = 75; calculate RTIN from the following equation: 75 R TIN = 75 1RG 0.1F capacitor as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1F capacitor. Maxim recommends using microstrip and stripline techniques to obtain full bandwidth. To ensure that the PC board does not degrade the amplifier's performance, design it for a frequency greater than 1GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you use a constantimpedance board, observe the following design guidelines: * Don't use wire-wrap boards; they are too inductive. * Don't use IC sockets; they increase parasitic capacitance and inductance. * Use surface-mount instead of through-hole components for better high-frequency performance. * Use a PC board with at least two layers; it should be as free from voids as possible. * Keep signal lines as short and as straight as possible. Do not make 90 turns; round all corners. and the rail-to-rail output substantially increase the dynamic range. With a symmetric input in a single +5V application, the input can swing 2.95Vp-p and the output can swing 4.9Vp-p with minimal distortion. Output Capacitive Loading and Stability The MAX4450/MAX4451 are optimized for AC performance. They are not designed to drive highly reactive loads, which decrease phase margin and may produce excessive ringing and oscillation. Figure 2 shows a circuit that eliminates this problem. Figure 3 is a graph of the optimal isolation resistor (RS) vs. capacitive load. Figure 4 shows how a capacitive load causes excessive peaking of the amplifier's frequency response if the capacitor is not isolated from the amplifier by a resistor. A small isolation resistor (usually 20 to 30) placed before the reactive load prevents ringing and oscillation. At higher capacitive loads, AC performance is controlled by the interaction of the load capacitance and the isolation resistor. Figure 5 shows the effect of a 27 isolation resistor on closed-loop response. Coaxial cable and other transmission lines are easily driven when properly terminated at both ends with their characteristic impedance. Driving back-terminated transmission lines essentially eliminates the line's capacitance. Rail-to-Rail Outputs, Ground-Sensing Input The input common-mode range extends from (VEE - 200mV) to (VCC - 2.25V) with excellent commonmode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase reversal or latchup. The output swings to within 55mV of either powersupply rail with a 2k load. The input ground sensing 8 _______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 30 ISOLATION RESISTANCE, RISO () 25 20 15 10 5 0 0 50 100 150 200 CAPACITIVE LOAD, CL (pF) 250 RG RF RISO MAX445 _ VOUT CL VIN RTIN 50 Figure 2. Driving a Capacitive Load Through an Isolation Resistor Figure 3. Capacitive Load vs. Isolation Resistance 6 5 4 3 GAIN (dB) GAIN (dB) 2 1 0 -1 -2 -3 -4 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 5pF CL = 10pF CL = 15pF 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 120pF CL = 68pF RISO = 27 CL = 47pF Figure 4. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor Figure 5. Small-Signal Gain vs. Frequency with Load Capacitance and 27 Isolation Resistor _______________________________________________________________________________________ 9 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Pin Configurations (continued) TOP VIEW Chip Information MAX4450 TRANSISTOR COUNT: 86 MAX4451 TRANSISTOR COUNT: 170 OUTA 1 INA- 2 8 7 VCC OUTB INBINB+ MAX4451 INA+ 3 6 5 VEE 4 SOT23-8/SO 10 ______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs Package Information SC70, 5L.EPS MAX4450/MAX4451 ______________________________________________________________________________________ SOT5L.EPS 11 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Package Information (continued) SOT23, 8L.EPS 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. SOICN.EPS |
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