19-1246; Rev 3; 8/04 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs The MAX4012 single, MAX4016 dual, MAX4018 triple, and MAX4020 quad op amps are unity-gain-stable devices that combine high-speed performance with Railto-Rail outputs. The MAX4018 has a disable feature that reduces power-supply current to 400A and places its outputs into a high-impedance state. These devices operate from a 3.3V to 10V single supply or from 1.65V to 5V dual supplies. The common-mode input voltage range extends beyond the negative power-supply rail (ground in single-supply applications). These devices require only 5.5mA of quiescent supply current while achieving a 200MHz -3dB bandwidth and a 600V/s slew rate. These parts are an excellent solution in low-power/low-voltage systems that require wide bandwidth, such as video, communications, and instrumentation. In addition, when disabled, their high-output impedance makes them ideal for multiplexing applications. The MAX4012 comes in a miniature 5-pin SOT23 and 8pin SO package, while the MAX4016 comes in 8-pin MAX(R) and SO packages. The MAX4018/MAX4020 are available in a space-saving 16-pin QSOP, as well as a 14-pin SO. 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 ____________________________Features Low-Cost High Speed: 200MHz -3dB Bandwidth (MAX4012) 150MHz -3dB Bandwidth (MAX4016/MAX4018/MAX4020) 30MHz 0.1dB Gain Flatness 600V/s Slew Rate Single 3.3V/5.0V Operation Rail-to-Rail Outputs Input Common-Mode Range Extends Beyond VEE Low Differential Gain/Phase: 0.02%/0.02 Low Distortion at 5MHz: -78dBc SFDR -75dB Total Harmonic Distortion High-Output Drive: 120mA 400A Shutdown Capability (MAX4018) High-Output Impedance in Off State (MAX4018) Space-Saving SOT23, SO, MAX, or QSOP Packages Ordering Information TEMP RANGE PART TOP MARK ABZP MAX4012EUK-T -40C to +85C 5 SOT23-5 MAX4012ESA -40C to +85C 8 SO -- MAX4016ESA -40C to +85C 8 SO -- MAX4016EUA -40C to +85C 8 MAX Ordering Information continued at end of data sheet. -- Pin Configurations Typical Operating Circuit TOP VIEW RF 24 MAX4012 RTO 50 MAX4012 PINPACKAGE OUT 1 5 VCC N.C. 1 8 N.C. IN- 2 7 VCC IN+ 3 6 OUT VEE 4 5 N.C. VOUT ZO = 50 RO 50 IN RTIN 50 VEE 2 MAX4012 IN+ 3 UNITY-GAIN LINE DRIVER (RL = RO + RTO) 4 SOT23-5 IN- SO Pin Configurations continued at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX4012/MAX4016/MAX4018/MAX4020 General Description MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ..................................................12V IN_-, IN_+, OUT_, EN_ .....................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration to VCC or VEE ............. Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C) ...........571mW 8-Pin SO (derate 5.9mW/C above +70C) .................471mW 8-Pin MAX (derate 4.1mW/C above +70C) ............330mW 14-Pin SO (derate 8.3mW/C above +70C) ...............667mW 16-Pin QSOP (derate 8.3mW/C above +70C) ..........667mW 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. DC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, EN_ = 5V, RL = to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP VCM Input Offset Voltage (Note 2) VOS 4 TCVOS 8 V/C Any channels for MAX4016/MAX4018/ MAX4020 1 mV IB (Note 2) 5.4 20 IOS (Note 2) 0.1 20 Differential mode (-1V VIN +1V) 70 k 3 M 100 dB Input Offset Voltage Temperature Coefficient Input Offset Voltage Matching Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio RIN CMRR Common mode (-0.2V VCM +2.75V) (VEE - 0.2V) VCM (VCC - 2.25V) 70 0.25V VOUT 4.75V, RL = 2k Open-Loop Gain (Note 2) AVOL 0.5V VOUT 4.5V, RL = 150 Output Voltage Swing (Note 2) RL = 150 VOUT RL = 75 RL = 75 to ground Output Current Output Short-Circuit Current Open-Loop Output Resistance 2 IOUT RL = 20 to VCC or VEE ISC Sinking or sourcing ROUT 20 V mV A A 61 52 1.0V VOUT 4V, RL = 50 RL = 2k VCC 2.25 UNITS Input Common-Mode Voltage Range Guaranteed by CMRR test VEE 0.20 MAX 59 dB 57 VCC - VOH 0.06 VOL - VEE 0.06 VCC - VOH 0.30 VOL - VEE 0.30 VCC - VOH 0.6 1.5 VOL - VEE 0.6 1.5 VCC - VOH 1.1 2.0 0.05 0.50 VOL - VEE TA = +25C 70 TA = TMIN to TMAX 60 120 V mA 150 mA 8 _______________________________________________________________________________________ Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs (VCC = 5V, VEE = 0, EN_ = 5V, RL = to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Power-Supply Rejection Ratio (Note 3) SYMBOL PSRR MIN TYP VCC = 5V, VEE = 0, VCM = 2.0V CONDITIONS 46 57 VCC = 5V, VEE = -5V, VCM = 0 54 VCC = 3.3V, VEE = 0, VCM = 0.90V Operating Supply-Voltage Range Disabled Output Resistance VS ROUT (OFF) EN_ Logic-Low Threshold VIL EN_ Logic-High Threshold VIH EN_ Logic Input Low Current IIL EN_ Logic Input High Current IIH Quiescent Supply Current (per Amplifier) IS VCC to VEE EN_ = 0, 0 VOUT 5V (Note 4) MAX 66 UNITS dB 45 3.15 28 11.0 V k 35 VCC - 2.6 VCC - 1.6 V V (VEE + 0.2V) EN_ VCC 0.5 EN_ = 0 200 EN_ = 5V 0.5 10 Enabled 5.5 7.0 MAX4018, disabled (EN_ = 0) 0.40 0.65 400 A A mA _______________________________________________________________________________________ 3 MAX4012/MAX4016/MAX4018/MAX4020 DC ELECTRICAL CHARACTERISTICS (continued) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs AC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, VCM = 2.5V, EN_ = 5V, RF = 24, RL = 100 to VCC/2, VOUT = VCC/2, AVCL = 1, TA = +25C, unless otherwise noted.) PARAMETER SYMBOL Small-Signal -3dB Bandwidth BWSS VOUT = 20mVP-P Large-Signal -3dB Bandwidth BWLS VOUT = 2VP-P Bandwidth for 0.1dB Gain Flatness BW0.1dB CONDITIONS MIN TYP MAX4012 200 MAX4016/MAX4018/ MAX4020 150 VOUT = 20mVP-P (Note 5) 6 MAX UNITS MHz 140 MHz 30 MHz Slew Rate SR VOUT = 2V step 600 V/s Settling Time to 0.1% tS VOUT = 2V step 45 ns 1 ns -78 dBc Rise/Fall Time tR, tF VOUT = 100mVP-P Spurious-Free Dynamic Range SFDR fC = 5MHz, VOUT = 2VP-P Harmonic Distortion Two-Tone, Third-Order Intermodulation Distortion HD IP3 Input 1dB Compression Point fC = 5MHz, VOUT = 2VP-P 2nd harmonic -78 3rd harmonic -82 Total harmonic distortion -75 dB 35 dBc f1 = 10.0MHz, f2 = 10.1MHz, VOUT = 1VP-P 11 dBm Differential Phase Error DP NTSC, RL = 150 0.02 degrees Differential Gain Error DG NTSC, RL = 150 0.02 % Input Noise-Voltage Density en f = 10kHz 10 nV/Hz Input Noise-Current Density in f = 10kHz 1.3 pA/Hz Input Capacitance fC = 10MHz, AVCL = 2 dBc 1 pF MAX4018, EN_ = 0 2 pF ZOUT f = 10MHz 6 Amplifier Enable Time tON MAX4018 100 ns Amplifier Disable Time tOFF MAX4018 1 s MAX4016/MAX4018/MAX4020, f = 10MHz, VOUT = 20mVP-P 0.1 dB MAX4016/MAX4018/MAX4020, f = 10MHz, VOUT = 2VP-P, RS = 50 to ground -95 dB Disabled Output Capacitance Output Impedance CIN COUT (OFF) Amplifier Gain Matching Amplifier Crosstalk XTALK Note 1: The MAX4012EUT is 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; for dual 5V supply with VEE = -4.5V to -5.5V, VCC = 4.5V to 5.5V; and for single 3.3V supply with VEE = 0, VCC = 3.15V to 3.45V. Note 4: Does not include the external feedback network's impedance. Note 5: Guaranteed by design. 4 _______________________________________________________________________________________ Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs -2 -3 -1 -2 -3 100M -7 1G 100k FREQUENCY (Hz) 1M 100k 1G AVCL = 2 VOUT = 20mVP-P 4 3 7 GAIN (dB) 6 5 4 3 2 1 0 VOUT = 2VP-P VOUT BIAS = 1.75V -1 10M 100M 0.6 0.5 1 0.4 0 0.3 -1 -2 0 -0.1 -5 -0.2 -0.3 100k 1M 100M 1G 0.1M RS = 50 30 1000 -90 -0.4 -130 -0.5 -150 10M FREQUENCY (Hz) 100M 1G IMPEDANCE () CROSSTALK (dB) -50 -70 -110 1G 100 -30 -0.3 100M CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY -10 -0.2 10M FREQUENCY (Hz) 50 MAX4012-07 0 -0.1 1M FREQUENCY (Hz) 10 0.1 1M 10M MAX4016/MAX4018/MAX4020 CROSSTALK vs. FREQUENCY 0.2 0.1M 0.1 -4 FREQUENCY (Hz) AVCL = 1 VOUT = 20mVP-P AVCL = 1 VOUT = 20mVP-P 0.2 -3 MAX4016/MAX4018/MAX4020 GAIN FLATNESS vs. FREQUENCY 0.5 1G 0.7 2 1G 100M MAX4012 GAIN FLATNESS vs. FREQUENCY MAX4212-08 1M 10M FREQUENCY (Hz) -6 100k 1M LARGE-SIGNAL GAIN vs. FREQUENCY MAX4012-04 9 GAIN (dB) 100M FREQUENCY (Hz) MAX4016/MAX4018/MAX4020 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = 2) 0.3 10M MAX4012-09 10M GAIN (dB) 1M -1 MAX4012-05 100k 3 0 -6 -6 4 1 -5 -5 5 2 -4 -4 MAX4012-03 6 GAIN (dB) GAIN (dB) GAIN (dB) -1 AVCL = 2 VOUT = 20mVP-P 7 0 0 0.4 8 1 1 GAIN (dB) AVCL = 1 VOUT = 20mVP-P 2 2 8 9 3 MAX4012-02 AVCL = 1 VOUT = 20mVP-P MAX4012-06 MAX4012-01 4 3 10 1 0.1 100k 1M 10M FREQUENCY (Hz) 100M 1G 0.1M 1M 10M 100M FREQUENCY (Hz) _______________________________________________________________________________________ 5 MAX4012/MAX4016/MAX4018/MAX4020 Typical Operating Characteristics (VCC = 5V, VEE = 0, AVCL = 1, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) MAX4012 MAX4012 MAX4016/MAX4018/MAX4020 SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = 1) (AVCL = 2) (AVCL = 1) Typical Operating Characteristics (continued) (VCC = 5V, VEE = 0, AVCL = 1, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) HARMONIC DISTORTION vs. FREQUENCY (AVCL = 2) -40 -50 -60 2ND HARMONIC -80 -20 -30 -40 -50 -60 -70 -80 3RD HARMONIC -100 10M 100M 100k 1M MAX4012-13 f = 5MHz VOUT = 2VP-P HARMONIC DISTORTION (dBc) HARMONIC DISTORTION (dBc) -40 -50 -60 2rd HARMONIC -80 3rd HARMONIC 400 600 LOAD () -30 800 -50 -60 -70 2ND HARMONIC -80 3RD HARMONIC -30 -40 -50 -60 -70 -80 -90 0.03 10M FREQUENCY (Hz) 100M MAX4012-12 VCM = 1.35V 0.02 0.01 0.00 0 1.0 1.5 OUTPUT SWING (Vp-p) 100 IRE 2.0 OUTPUT SWING vs. LOAD RESISTANCE 4.5 MAX4012-17 20 10 0 -10 -20 -30 -40 -50 -60 RL to VCC/2 4.0 RL to GROUND 3.5 3.0 2.5 2.0 1.5 AVCL = 2 1.0 -80 1M 100 IRE -70 -100 6 0.00 -0.01 OUTPUT SWING (Vp-p) -20 0.01 0 POWER-SUPPLY REJECTION vs. FREQUENCY POWER-SUPPLY REJECTION (dB) -10 VCM = 1.35V 0.02 -40 0.5 MAX4012-16 0 100M 0.03 -100 1000 10M -0.01 COMMON-MODE REJECTION vs. FREQUENCY 100k 1M DIFFERENTIAL GAIN AND PHASE -20 -90 -100 200 fO = 5MHz -10 -30 0 100k FREQUENCY (Hz) 0 -20 -90 -80 100M HARMONIC DISTORTION vs. OUTPUT SWING 0 -70 10M 3RD HARMONIC -70 FREQUENCY (Hz) HARMONIC DISTORTION vs. LOAD -10 -60 -90 FREQUENCY (Hz) 2ND HARMONIC -50 -100 DIFF. GAIN (%) 1M -40 -100 DIFF. PHASE (deg) 100k 3RD HARMONIC -30 -90 MAX4012-14 -90 2ND HARMONIC -20 MAX4012-18 -30 VOUT = 2VP-P AVCL = 5 -10 HARMONIC DISTORTION (dBc) -20 -70 VOUT = 2VP-P AVCL = 2 -10 0 MAX4012-11 VOUT = 2VP-P AVCL = 1 HARMONIC DISTORTION (dBc) HARMONIC DISTORTION (dBc) 0 MAX4012-10 0 -10 HARMONIC DISTORTION vs. FREQUENCY (AVCL = 5) MAX4012-15 HARMONIC DISTORTION vs. FREQUENCY (AVCL = 1) CMR (dB) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs 100k 1M 10M FREQUENCY (Hz) 100M 25 50 75 100 125 LOAD RESISTANCE () _______________________________________________________________________________________ 150 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs SMALL-SIGNAL PULSE RESPONSE (AVCL = 2) SMALL-SIGNAL PULSE RESPONSE (AVCL = 1) SMALL-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = 1) MAX4012-20 MAX4012-19 MAX4012-21 IN (25mV/ div) IN (50mV/ div) VOLTAGE VOLTAGE VOLTAGE IN (50mV/ div) OUT (25mV/ div) OUT (25mV/ div) OUT (25mV/ div) 20ns/div 20ns/div 20ns/div VCM = 1.25V, RL = 100 to GROUND VCM = 2.5V, RL = 100 to GROUND VCM = 1.75V, RL = 100 to GROUND LARGE-SIGNAL PULSE RESPONSE (AVCL = 2) LARGE-SIGNAL PULSE RESPONSE (AVCL = 1) LARGE-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = 2) MAX4012-23 MAX4012-22 MAX4012-24 IN (1V/ div) IN (500mV/ div) VOLTAGE VOLTAGE VOLTAGE IN (1V/div) OUT (1V/div) OUT (500mV/ div) OUT (500mV/ div) 20ns/div 20ns/div VOLTAGE-NOISE DENSITY vs. FREQUENCY VCM = 1.75V, RL = 100 to GROUND CURRENT-NOISE DENSITY vs. FREQUENCY ENABLE RESPONSE TIME MAX4012-27 MAX4012-26 10 10 5.0V (ENABLE) EN_ CURRENT-NOISE DENSITY MAX4012-25 100 VOLTAGE-NOISE DENSITY 20ns/div VCM = 0.9V, RL = 100 to GROUND VCM = 1.75V, RL = 100 to GROUND 0 (DISABLE) OUT 1V 0 1 1 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 1s/div 10M VIN = 1.0V _______________________________________________________________________________________ 7 MAX4012/MAX4016/MAX4018/MAX4020 Typical Operating Characteristics (continued) (VCC = 5V, VEE = 0, AVCL = 1, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = 5V, VEE = 0, AVCL = 1, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.) CLOSED-LOOP BANDWIDTH vs. LOAD RESISTANCE 40 30 20 200 400 600 800 LOAD RESISTANCE () MAX4012-29 300 250 200 150 100 3 0 100 200 300 400 500 LOAD RESISTANCE () 100k 600 75 MAX4012-32 0.20 INPUT OFFSET VOLTAGE 5.0 4.5 0 -25 0 25 50 TEMPERATURE (C) 75 100 -50 4 2 10 11 0 25 50 TEMPERATURE (C) 75 5.0 MAX4012-35 4 3 2 1 0 0 -25 100 OUTPUT VOLTAGE SWING vs. TEMPERATURE RL = 150 TO VCC/2 OUTPUT VOLTAGE SWING (Vp-p) INPUT OFFSET VOLTAGE (mV) 6 6 7 8 9 SUPPLY VOLTAGE (V) 0.08 0.04 5 MAX4012-34 8 5 0.12 INPUT OFFSET VOLTAGE vs. TEMPERATURE 10 100M 0.16 -50 SUPPLY CURRENT vs. SUPPLY VOLTAGE 10M INPUT OFFSET CURRENT vs. TEMPERATURE 5.5 100 1M FREQUENCY (Hz) 4.0 4 -60 -80 6.0 MAX4012-31 4 3 -50 -70 0 INPUT BIAS CURRENT (A) SUPPLY CURRENT (mA) 5 0 25 50 TEMPERATURE (C) -40 -90 1k 6 -25 -30 INPUT BIAS CURRENT vs. TEMPERATURE 7 -50 -20 50 SUPPLY CURRENT vs. TEMPERATURE 8 0 -10 MAX4012-33 0 350 MAX4012-36 50 OFF-ISOLATION vs. FREQUENCY 10 OFF-ISOLATION (dB) CLOSED-LOOP BANDWIDTH (MHz) 60 OPEN-LOOP GAIN (dB) 400 MAX4012-28 70 MAX4012-30 OPEN-LOOP GAIN vs. LOAD RESISTANCE SUPPLY CURRENT (mA) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs 4.8 4.6 4.4 4.2 4.0 -50 -25 0 25 50 TEMPERATURE (C) 75 100 -50 -25 0 25 50 TEMPERATURE (C) _______________________________________________________________________________________ 75 100 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs PIN MAX4012 MAX4012 SO-8 SOT23 1, 5, 8 -- 6 MAX4016 SO/MAX MAX4018 MAX4020 NAME FUNCTION SO QSOP SO QSOP -- -- 8, 9 -- 8, 9 N.C. No Connection. Not internally connected. Tie to ground or leave open. 1 -- -- -- -- -- OUT Amplifier Output 4 2 4 11 13 11 13 VEE Negative Power Supply or Ground (in singlesupply operation) 3 3 -- -- -- -- -- IN+ Noninverting Input 2 4 -- -- -- -- -- IN- Inverting Input 7 5 8 4 4 4 4 VCC Positive Power Supply -- -- 1 7 7 1 1 OUTA -- -- 2 6 6 2 2 INA- Amplifier A Inverting Input -- -- 3 5 5 3 3 INA+ Amplifier A Noninverting Input -- -- 7 8 10 7 7 OUTB Amplifier B Output -- -- 6 9 11 6 6 INB- Amplifier B Inverting Input -- -- 5 10 12 5 5 INB+ Amplifier B Noninverting Input -- -- -- 14 16 8 10 OUTC Amplifier C Output -- -- -- 13 15 9 11 INC- Amplifier C Inverting Input -- -- -- 12 14 10 12 INC+ Amplifier C Noninverting Input -- -- -- -- -- 14 16 OUTD Amplifier D Output -- -- -- -- -- 13 15 IND- -- -- -- -- -- 12 14 IND+ -- -- -- -- -- -- -- EN -- -- -- 1 1 -- -- ENA Enable Amplifier A -- -- -- 3 3 -- -- ENB Enable Amplifier B -- -- -- 2 2 -- -- ENC Enable Amplifier C Amplifier A Output Amplifier D Inverting Input Amplifier D Noninverting Input Enable Amplifier _______________________________________________________________________________________ 9 MAX4012/MAX4016/MAX4018/MAX4020 Pin Description MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs Detailed Description The MAX4012/MAX4016/MAX4018/MAX4020 are single-supply, rail-to-rail, voltage-feedback amplifiers that employ current-feedback techniques to achieve 600V/s slew rates and 200MHz 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 swing comes to within 50mV of each supply rail. Local feedback around the output stage assures low open-loop output impedance to reduce gain sensitivity to load variations. This feedback also produces demand-driven current bias to the output transistors for 120mA drive capability, while constraining total supply current to less than 7mA. The input stage permits common-mode voltages beyond the negative supply and to within 2.25V of the positive supply rail. Applications Information Choosing Resistor Values Unity-Gain Configuration The MAX4012/MAX4016/MAX4018/MAX4020 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 cir- RG cuit formed by the parasitic feedback capacitance and inductance. 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 shows suggested feedback, gain resistors, and bandwidth for several gain values in the configurations shown in Figures 1a and 1b. Layout and Power-Supply Bypassing These amplifiers operate from a single 3.3V to 11V power supply or from dual supplies to 5.5V. For single-supply operation, bypass VCC to ground with a 0.1F capacitor as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1F capacitor. RF RF RG IN RTO VOUT RTIN RTO MAX40_ _ IN VOUT = [1+ (RF / RG)] VIN RTIN Figure 1a. Noninverting Gain Configuration 10 VOUT MAX40_ _ RO VOUT = -(RF / RG) VIN RS Figure 1b. Inverting Gain Configuration ______________________________________________________________________________________ RO Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs * 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. 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 60mV of either powersupply rail with a 2k load. The input ground-sensing 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. Enable Input and Disabled Output The enable feature (EN_) allows the amplifier to be placed in a low-power, high-output-impedance state. Typically, the EN_ logic low input current (IIL) is small. However, as the EN voltage (VIL) approaches the negative supply rail, IIL increases (Figure 2). A single resistor connected as shown in Figure 3 prevents the rise in the logic-low input current. This resistor provides a feedback mechanism that increases VIL as the logic input is brought to VEE. Figure 4 shows the resulting input current (IIL). When the MAX4018 is disabled, the amplifier's output impedance is 35k. This high resistance and the low 2pF output capacitance make this part ideal in RF/video multiplexer or switch applications. For larger arrays, pay careful attention to capacitive loading. See the Output Capacitive Loading and Stability section for more information. Table 1. Recommended Component Values GAIN (V/V) COMPONENT +1 -1 +2 -2 +5 -5 +10 -10 +25 -25 RF () 24 500 500 500 500 500 500 500 500 1200 RG () 500 500 250 124 100 56 50 20 50 RS () -- 0 -- 0 -- 0 -- 0 -- 0 RTIN () 49.9 56 49.9 62 49.9 100 49.9 49.9 RTO () 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 Small-Signal -3dB Bandwidth (MHz) 200 90 105 60 25 33 11 25 6 10 Note: RL = RO + RTO; RTIN and RTO are calculated for 50 applications. For 75 systems, RTO = 75; calculate RTIN from the following equation: R TIN = 75 75 1RG ______________________________________________________________________________________ 11 MAX4012/MAX4016/MAX4018/MAX4020 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 guidelines when designing the board: * Don't use wire-wrap boards because they are too inductive. * Don't use IC sockets because they increase parasitic capacitance and inductance. * Use surface-mount instead of through-hole components for better high-frequency performance. 20 ENABLE 0 INPUT CURRENT (A) -20 10k -40 IN- -60 -80 EN_ MAX40_ _ OUT IN+ -100 -120 -140 -160 0 50 100 150 200 250 300 350 400 450 500 Figure 3. Circuit to Reduce Enable Logic-Low Input Current mV ABOVE VEE Figure 2. Enable Logic-Low Input Current vs. VIL 0 -1 -2 INPUT CURRENT (A) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs -3 To implement the mux function, the outputs of multiple amplifiers can be tied together, and only the amplifier with the selected input will be enabled. All of the other amplifiers will be placed in the low-power shutdown mode, with their high output impedance presenting very little load to the active amplifier output. For gains of +2 or greater, the feedback network impedance of all the amplifiers used in a mux application must be considered when calculating the total load on the active amplifier output Output Capacitive Loading and Stability -4 -5 -6 -7 -8 -9 -10 0 50 100 150 200 250 300 350 400 450 500 mV ABOVE VEE Figure 4. Enable Logic-Low Input Current vs. VIL with 10k Series Resistor The MAX4012/MAX4016/MAX4018/MAX4020 are optimized for AC performance. They are not designed to drive highly reactive loads, which decreases phase margin and may produce excessive ringing and oscillation. Figure 5 shows a circuit that eliminates this problem. Figure 6 is a graph of the optimal isolation resistor (RS) vs. capacitive load. Figure 7 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 8 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. 12 ______________________________________________________________________________________ Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020 RF RG RISO VOUT MAX40_ _ VIN CL 50 RTIN ISOLATION RESISTANCE, RISO () 30 25 20 15 10 5 0 0 Figure 5. Driving a Capacitive Load through an Isolation Resistor 100 150 200 CAPACITIVE LOAD (pF) 250 Figure 6. Capacitive Load vs. Isolation Resistance 6 3 5 2 CL = 15pF 4 RISO = 27 CL = 47pF 1 3 0 CL = 10pF 2 GAIN (dB) GAIN (dB) 50 1 0 CL = 5pF -1 CL = 68pF -1 -2 CL = 120pF -3 -4 -2 -5 -3 -6 -4 -7 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 7. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 8. Small-Signal Gain vs. Frequency with Load Capacitance and 27 Isolation Resistor ______________________________________________________________________________________ 13 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020 Pin Configurations (continued) TOP VIEW ENA 1 14 OUTC OUTA 1 14 OUTD ENC 2 ENB 3 13 INC- INA- 2 13 IND- 12 INC+ INA+ 3 12 IND+ 11 VEE VCC 4 INA+ 5 10 INB+ INB+ 5 10 INC+ INA- 6 9 INB- INB- 6 9 INC- OUTA 7 8 OUTB OUTB 7 8 OUTC VCC 4 MAX4018 SO OUTA 1 INA- 2 INA+ 3 MAX4016 VEE 4 VCC 7 OUTB 6 INB- 5 INB+ 11 VEE SO ENA 1 16 OUTC OUTA 1 16 OUTD ENC 2 15 INC- INA- 2 15 IND- 14 INC+ INA+ 3 14 IND+ 13 VEE VCC 4 INA+ 5 12 INB+ INB+ 5 12 INC+ ENB 3 VCC 4 MAX4018 MAX4020 13 VEE INA- 6 11 INB- INB- 6 11 INC- OUTA 7 10 OUTB OUTB 7 10 OUTC N.C. 8 9 N.C. N.C. 8 9 N.C. QSOP 14 SO/MAX 8 MAX4020 QSOP ______________________________________________________________________________________ Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs PART TEMP RANGE PINPACKAGE TOP MARK MAX4018ESD -40C to +85C 14 SO -- MAX4018EEE -40C to +85C 16 QSOP -- MAX4020ESD -40C to +85C 14 SO -- MAX4020EEE -40C to +85C 16 QSOP -- ___________________Chip Information MAX4012 TRANSISTOR COUNT: 95 MAX4016 TRANSISTOR COUNT: 190 MAX4018 TRANSISTOR COUNT: 299 MAX4020 TRANSISTOR COUNT: 362 Package Information SOT-23 5L .EPS (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.) PACKAGE OUTLINE, SOT-23, 5L 21-0057 E 1 1 ______________________________________________________________________________________ 15 MAX4012/MAX4016/MAX4018/MAX4020 Ordering Information (continued) Package Information (continued) 4X S 8 8 INCHES DIM A A1 A2 b E y 0.500.1 H c D e E H 0.60.1 L 1 1 0.60.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.010 0.014 0.005 0.007 0.116 0.120 0.0256 BSC 0.116 0.120 0.188 0.198 0.016 0.026 0 6 0.0207 BSC 8LUMAXD.EPS (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.) MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC TOP VIEW A1 A2 A c e FRONT VIEW b L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. REV. 21-0036 1 J 1 QSOP.EPS MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 16 E 1 1 ______________________________________________________________________________________ Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to-Rail Outputs N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS DIM A A1 B C e E H L 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D C A B e 0-8 A1 L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0041 REV. B 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. 17 ____________________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. MAX4012/MAX4016/MAX4018/MAX4020 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.)