19-1246; Rev 0; 7/97 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs ________________________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 (MAX4016/18/20) 30MHz 0.1dB Gain Flatness 600V/µs 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 ♦ 400µA Shutdown Capability (MAX4018) ♦ High Output Impedance in Off State (MAX4018) ♦ Space-Saving SOT23-5, µMAX, or QSOP Packages ______________Ordering Information PART TEMP. RANGE PINPACKAGE SOT TOP MARK MAX4012EUK -40°C to +85°C 5 SOT23-5 ABZP MAX4016ESA -40°C to +85°C 8 SO — MAX4016EUA -40°C to +85°C 8 µMAX — Ordering Information continued at end of data sheet. __________Typical Operating Circuit _________________Pin Configurations TOP VIEW RF 24Ω OUT 1 RTO 50Ω MAX4012 VOUT ZO = 50Ω VEE 2 5 VCC 4 IN- MAX4012 RO 50Ω IN IN+ 3 RTIN 50Ω UNITY-GAIN LINE DRIVER (RL = RO + RTO) 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 & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468. MAX4012/MAX4016/MAX4018/MAX4020 _______________General Description The MAX4012 single, MAX4016 dual, MAX4018 triple, and MAX4020 quad op amps are unity-gain-stable devices that combine high-speed performance with Rail-to-Rail® outputs. The MAX4018 has a disable feature that reduces power-supply current to 400µA 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/µs 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 package, while the MAX4016 comes in 8-pin µMAX and SO packages. The MAX4018/MAX4020 are available in a space-saving 16-pin QSOP, as well as a 14-pin SO. MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, 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 = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C) ...........571mW 8-Pin SO (derate 5.9mW/°C above +70°C) .................471mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW 14-Pin SO (derate 8.3mW/°C above +70°C) ...............667mW 16-Pin QSOP (derate 8.3mW/°C above +70°C) ..........667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C 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 = 0V, EN_ = +5V, RL = are at TA = +25°C.) (Note 1) PARAMETER ∞ to VCC / 2, VOUT = VCC / 2, TA = TMIN to TMAX, unless otherwise noted. Typical values SYMBOL CONDITIONS MIN TYP VCM Input Offset Voltage (Note 2) VOS 4 TCVOS 8 µV/°C Any channels for MAX4016/MAX4018/ MAX4020 ±1 mV IB (Note 2) 5.4 20 µA IOS (Note 2) 0.1 20 Differential mode (-1V ≤ VIN ≤ +1V) 70 µA kΩ Common mode (-0.2V ≤ VCM ≤ +2.75V) 3 MΩ 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 (VEE - 0.2V) ≤ VCM ≤ (VCC - 2.25V) 70 0.25V ≤ VOUT ≤ 4.75V, RL = 2kΩ Open-Loop Gain (Note 2) AVOL 0.5V ≤ VOUT ≤ 4.5V, RL = 150Ω Output Voltage Swing (Note 2) RL = 150Ω VOUT RL = 75Ω RL = 75Ω to ground Output Current Output Short-Circuit Current Open-Loop Output Resistance 2 IOUT ISC ROUT RL = 20Ω to VCC or VEE Sinking or sourcing 20 V mV 61 52 1.0V ≤ VOUT ≤ 4V, RL = 50Ω RL = 2kΩ 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 VOL - VEE 0.05 0.50 ±100 V ±120 mA ±150 mA 8 Ω _______________________________________________________________________________________ Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs (VCC = +5V, VEE = 0V, EN_ = +5V, RL = are at TA = +25°C.) (Note 1) PARAMETER Power-Supply Rejection Ratio (Note 3) ∞ to VCC / 2, VOUT = VCC / 2, TA = TMIN to TMAX, unless otherwise noted. Typical values SYMBOL PSRR MIN TYP VCC = 5V, VEE = 0V, VCM = +2.0V CONDITIONS 46 57 VCC = 5V, VEE = -5V, VCM = 0V 54 66 VCC = 3.3V, VEE = 0V, 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_ = 0V, 0V ≤ VOUT ≤ 5V (Note 4) MAX UNITS dB 45 3.15 28 11.0 V kΩ 35 VCC - 2.6 VCC - 1.6 V V (VEE + 0.2V) ≤ EN_ ≤ VCC 0.5 EN_ = 0V 200 EN_ = 5V 0.5 10 Enabled 5.5 7.0 MAX4018, disabled (EN_ = 0V) 0.40 0.55 300 µA µA mA _______________________________________________________________________________________ 3 MAX4012/MAX4016/MAX4018/MAX4020 DC ELECTRICAL CHARACTERISTICS (continued) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs AC ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = 0V, VCM = 2.5V, EN_ = +5V, RF = 24Ω, RL = 100Ω to VCC / 2, VOUT = VCC / 2, AVCL = +1, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS Small-Signal -3dB Bandwidth BWSS VOUT = 20mVp-p Large-Signal -3dB Bandwidth BWLS VOUT = 2Vp-p Bandwidth for 0.1dB Gain Flatness BW0.1dB 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/µs 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 = 150Ω 0.02 degrees Differential Gain Error DG NTSC, RL = 150Ω 0.02 % Input Noise-Voltage Density en f = 10kHz 10 nV/√Hz in f = 10kHz 6 pA/√Hz 1 pF pF Input Noise-Current Density Input Capacitance Disabled Output Capacitance fC = 10MHz, AVCL = +2 dBc CIN MAX4018, EN_ = 0V 2 ZOUT f = 10MHz 6 Ω Amplifier Enable Time tON MAX4018 100 ns Amplifier Disable Time tOFF MAX4018 Output Impedance COUT (OFF) Amplifier Gain Matching Amplifier Crosstalk XTALK 1 µs MAX4016/MAX4018/MAX4020, f = 10MHz, VOUT = 20mVp-p 0.1 dB MAX4016/MAX4018/MAX4020, f = 10MHz, VOUT = 2Vp-p, RS = 50Ω to ground -95 dB Note 1: The MAX4012EUT is 100% production tested at TA = +25°C. 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 = 0V, 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 = 0V, 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, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs AVCL = +1 VOUT = 20mVp-p 8 1 7 1 0 6 0 -1 5 -1 -2 GAIN (dB) 2 -2 -3 3 -4 2 -4 -5 1 -5 -6 0 -6 -7 -1 1M 10M 100M 100k 1M 10M 100M 100k 1G 100M FREQUENCY (Hz) MAX4016/18/20 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2) LARGE-SIGNAL GAIN vs. FREQUENCY MAX4012 GAIN FLATNESS vs. FREQUENCY 3 VOUT = 2Vp-p VOUT BIAS = 1.75V 0.7 0.6 0.4 5 0 0.3 3 GAIN (dB) 0.5 1 GAIN (dB) 2 4 -1 -2 0.1 -3 0 1 -4 -0.1 0 -5 -0.2 -6 1M 10M 100M 1G 1M 10M 100M 1G 0.1M 1M 10M 100M 1G FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) MAX4016/18/20 GAIN FLATNESS vs. FREQUENCY MAX4016/18/20 CROSSTALK vs. FREQUENCY CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY AVCL = +1 VOUT = 20mVp-p 1000 10 0.1 0 -0.1 -30 -50 -70 -0.2 -90 -0.3 -110 -0.4 -130 -0.5 -150 10M FREQUENCY (Hz) 100M 1G 100 -10 IMPEDANCE (Ω) CROSSTALK (dB) 0.2 1M RS = 50Ω 30 MAX4012-09 50 MAX4012-07 0.5 0.1M -0.3 100k MAX4212-08 100k AVCL = +1 VOUT = 20mVp-p 0.2 2 -1 1G MAX4012-06 4 MAX4012-05 AVCL = +2 VOUT = 20mVp-p 6 0.3 10M FREQUENCY (Hz) 7 0.4 1M FREQUENCY (Hz) MAX4012-04 8 1G AVCL = +2 VOUT = 20mVp-p 4 -3 9 GAIN (dB) 9 MAX4012-02 2 GAIN (dB) GAIN (dB) AVCL = +1 VOUT = 20mVp-p 100k GAIN (dB) 3 MAX4012-01 4 3 MAX4012 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2) MAX4016/18/20 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +1) MAX4012-03 MAX4012 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +1) 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 = 0V, AVCL = +1, RF = 24Ω, RL = 100Ω to VCC / 2, TA = +25°C, unless otherwise noted.) ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, AVCL = +1, RF = 24Ω, RL = 100Ω to VCC / 2, TA = +25°C, unless otherwise noted.) -60 2ND HARMONIC -80 -100 100k 1M 10M -50 -60 -80 10M HARMONIC DISTORTION (dBc) -60 -70 2rd HARMONIC -80 100k 200 400 600 LOAD (Ω) 800 -30 -40 -60 -70 2ND HARMONIC -80 3RD HARMONIC -40 -50 -60 -70 -80 100M 0.00 0 100 OUTPUT SWING vs. LOAD RESISTANCE 4.5 MAX4012-17 -20 -30 -40 -50 RL to VCC/2 4.0 RL to GROUND 3.5 3.0 2.5 2.0 -60 -80 10M 0.01 0 -10 -100 FREQUENCY (Hz) VCM = +1.35V 0.02 IRE 10 -70 1M 100 IRE 0.03 2.0 20 -90 100k 0.00 -0.01 1.0 1.5 OUTPUT SWING (Vp-p) OUTPUT SWING (Vp-p) -30 0.01 POWER-SUPPLY REJECTION vs. FREQUENCY POWER-SUPPLY REJECTION (dB) -20 VCM = +1.35V 0.02 0 0.5 MAX4012-16 0 100M -0.01 COMMON-MODE REJECTION vs. FREQUENCY -10 10M 0.03 -50 1000 1M DIFFERENTIAL GAIN AND PHASE -100 0 MAX4012-12 -80 FREQUENCY (Hz) -20 -90 3rd HARMONIC 3RD HARMONIC -70 100M fO = 5MHz -10 -100 6 1M 0 MAX4012-13 -50 -60 -90 100k 2ND HARMONIC -50 -100 HARMONIC DISTORTION vs. OUTPUT SWING -40 -40 -100 HARMONIC DISTORTION vs. LOAD -30 -30 3RD HARMONIC FREQUENCY (Hz) -20 -20 -90 100M f = 5MHz VOUT = 2Vp-p -90 2ND HARMONIC -70 FREQUENCY (Hz) 0 -10 MAX4012-11 -40 3RD HARMONIC -90 HARMONIC DISTORTION (dBc) -30 VOUT = 2Vp-p AVCL = +5 MAX4012-18 -50 HARMONIC DISTORTION (dBc) -40 -20 DIFF. GAIN (%) -30 0 -10 DIFF. PHASE (deg) -20 VOUT = 2Vp-p AVCL = +2 MAX4012-14 HARMONIC DISTORTION (dBc) -10 HARMONIC DISTORTION (dBc) VOUT = 2Vp-p AVCL = +1 -70 0 MAX4012-10 0 -10 HARMONIC DISTORTION vs. FREQUENCY (AVCL = +5) HARMONIC DISTORTION vs. FREQUENCY (AVCL = +2) MAX4012-15 HARMONIC DISTORTION vs. FREQUENCY (AVCL = +1) CMR (dB) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs 1.5 AVCL = +2 1.0 100k 1M 10M FREQUENCY (Hz) 100M 25 50 75 100 125 LOAD RESISTANCE (Ω) _______________________________________________________________________________________ 150 Low-Cost, High-Speed, SOT23, 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) TIME (20ns/div) TIME (20ns/div) TIME (20ns/div) VCM = +1.25V, RL = 100Ω to GROUND VCM = +2.5V, RL = 100Ω to GROUND VCM = +1.75V, RL = 100Ω to GROUND LARGE-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = +2) LARGE-SIGNAL PULSE RESPONSE (AVCL = +2) LARGE-SIGNAL PULSE RESPONSE (AVCL = +1) MAX4012-24 MAX4012-23 MAX4012-22 IN (1V/ div) IN (500mV/ div) VOLTAGE VOLTAGE VOLTAGE IN (1V/div) OUT (1V/div) OUT (500mV/ div) OUT (500mV/ div) TIME (20ns/div) TIME (20ns/div) TIME (20ns/div) VCM = +1.75V, RL = 100Ω to GROUND VCM = 0.9V, RL = 100Ω to GROUND VCM = +1.75V, RL = 100Ω to GROUND CURRENT-NOISE DENSITY vs. FREQUENCY VOLTAGE-NOISE DENSITY vs. FREQUENCY ENABLE RESPONSE TIME MAX4012-27 MAX4012-26 10 MAX4012-25 100 5.0V (ENABLE) NOISE (pA/√Hz) NOISE (nV/√Hz) EN_ 10 0V (DISABLE) OUT 1V 0V 1 1 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M TIME (1µs/div) 10M VIN = +1.0V _______________________________________________________________________________________ 7 MAX4012/MAX4016/MAX4018/MAX4020 ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, AVCL = +1, RF = 24Ω, RL = 100Ω to VCC / 2, TA = +25°C, unless otherwise noted.) ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, AVCL = +1, RF = 24Ω, RL = 100Ω to VCC / 2, TA = +25°C, unless otherwise noted.) OPEN-LOOP GAIN vs. LOAD RESISTANCE CLOSED-LOOP BANDWIDTH vs. LOAD RESISTANCE 40 30 0 -10 300 250 200 150 100 400 600 800 LOAD RESISTANCE (Ω) 1k 0 100 100k 600 5.5 5.0 4.5 100 -25 0 25 50 TEMPERATURE (°C) 75 2 0 10 11 -25 0 25 50 TEMPERATURE (°C) 75 100 OUTPUT VOLTAGE SWING vs. TEMPERATURE 5.0 RL = 150Ω TO VCC / 2 4 4.8 3 2 1 4.6 4.4 4.2 0 6 7 8 9 SUPPLY VOLTAGE (V) 0.04 -50 VOLTAGE SWING (Vp-p) INPUT OFFSET VOLTAGE (mV) 4 5 0.08 100 MAX4012-35 5 MAX4012-34 6 4 0.12 INPUT OFFSET VOLTAGE vs. TEMPERATURE 8 3 0.16 0 -50 SUPPLY CURRENT vs. SUPPLY VOLTAGE 10 100M 0.20 4.0 75 10M INPUT OFFSET CURRENT vs. TEMPERATURE INPUT OFFSET CURRENT (µA) 4 1M FREQUENCY (Hz) MAX4012-32 MAX4012-31 5 3 8 200 300 400 500 LOAD RESISTANCE (Ω) 6.0 INPUT BIAS CURRENT (µA) SUPPLY CURRENT (mA) 6 0 25 50 TEMPERATURE (°C) -60 INPUT BIAS CURRENT vs. TEMPERATURE 7 -25 -50 -90 SUPPLY CURRENT vs. TEMPERATURE -50 -40 MAX4012-33 200 -30 -80 0 0 -20 -70 50 20 MAX4012-30 MAX4012-29 350 MAX4012-36 50 OFF ISOLATION vs. FREQUENCY 10 OFF ISOLATION (dB) CLOSED-LOOP BANDWIDTH (MHz) 60 OPEN-LOOP GAIN (dB) 400 MAX4012-28 70 SUPPLY CURRENT (mA) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs 4.0 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 -50 -25 0 25 50 TEMPERATURE (°C) _______________________________________________________________________________________ 75 100 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs PIN PIN MAX4018 MAX4020 NAME FUNCTION 8, 9 N.C. No Connect. Not internally connected. Tie to ground or leave open. — — OUT Amplifier Output 13 11 13 VEE Negative Power Supply or Ground (in single-supply operation) — — — — IN+ Noninverting Input — — — — — IN- Inverting Input 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- Amplifier D Inverting Input — — — — 12 14 IND+ Amplifier D Noninverting Input — — — — — — EN — — 1 1 — — ENA Enable Amplifier A — — 3 3 — — ENB Enable Amplifier B — — 2 2 — — ENC Enable Amplifier C MAX4012 SOT23-5 MAX4016 SO/µMAX SO QSOP SO QSOP — — — 8, 9 — 1 — — — 2 4 11 3 — 4 Amplifier A Output Enable Amplifier _______________________________________________________________________________________ 9 MAX4012/MAX4016/MAX4018/MAX4020 ______________________________________________________________Pin Description MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, 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/µs 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 24Ω 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 1kΩ 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 1kΩ resistors to 100Ω extends the pole frequency to 1.59GHz, but could limit output swing by adding 200Ω 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 singlesupply operation, bypass VCC to ground with a 0.1µF capacitor as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1µF 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, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs • 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. 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 2kΩ 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 35kΩ. 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 (Ω) 24 500 500 500 500 500 500 500 500 1200 RG (Ω) ∞ 500 500 250 124 100 56 50 20 50 RS (Ω) — 0 — 0 — 0 — 0 — 0 RTIN (Ω) 49.9 56 49.9 62 49.9 100 49.9 ∞ 49.9 ∞ RTO (Ω) 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 50Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the following equation: R TIN = 75 Ω 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. 20 ENABLE 0 INPUT CURRENT (µA) -20 10k -40 IN- EN_ -60 MAX40_ _ -80 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 (µA) MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, 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 10kΩ 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 20Ω to 30Ω) 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 27Ω 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, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020 RF RG RISO VOUT MAX40_ _ VIN CL 50Ω RTIN ISOLATION RESISTANCE, RISO (Ω) 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 = 27Ω 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 27Ω Isolation Resistor ______________________________________________________________________________________ 13 MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs _____________________________________________Pin Configurations (continued) TOP VIEW ENA 1 14 OUTC OUTA 1 14 OUTD ENC 2 13 INC- INA- 2 13 IND- 12 INC+ INA+ 3 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 ENB 3 VCC 4 MAX4018 SO OUTA 1 INA- 2 INA+ 3 MAX4016 VEE 4 ENA 1 16 OUTC ENC 2 ENB 3 VCC 7 OUTB 6 INB- 5 INB+ 11 VEE SO OUTA 1 16 OUTD 15 INC- INA- 2 15 IND- 14 INC+ INA+ 3 13 VEE VCC 4 INA+ 5 12 INB+ INB+ 5 12 INC+ 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. VCC 4 MAX4018 QSOP 14 SO/µMAX 8 12 IND+ MAX4020 14 IND+ MAX4020 13 VEE QSOP ______________________________________________________________________________________ Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs PINPACKAGE SOT TOP MARK PART TEMP. RANGE MAX4018ESD -40°C to +85°C 14 SO — MAX4018EEE -40°C to +85°C 16 QSOP — MAX4020ESD -40°C to +85°C 14 SO — MAX4020EEE -40°C to +85°C 16 QSOP — ___________________Chip Information PART TRANSISTOR COUNT MAX4012 MAX4016 MAX4018 MAX4020 95 190 299 362 SOT5L.EPS ________________________________________________________Package Information ______________________________________________________________________________________ 15 MAX4012/MAX4016/MAX4018/MAX4020 _Ordering Information (continued) 8LUMAXD.EPS ___________________________________________Package Information (continued) QSOP.EPS MAX4012/MAX4016/MAX4018/MAX4020 Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs 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. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.