19-1195; Rev 0; 4/97 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps ________________________Applications Battery-Powered Devices pH Probes Portable Equipment Low-Power, Low-Voltage Equipment Medical Instruments Ionization Detectors Cellular Phones ____________________________Features ♦ 5-Pin SOT23 Package (MAX4162) ♦ 1.0pA Typical Input Bias Current ♦ Fully Specified Single-Supply Operation at 3V and 5V ♦ Input Common-Mode Voltage Range Extends 250mV Beyond Either Supply Rail ♦ Rail-to-Rail Output Swing ♦ 200kHz Gain-Bandwidth Product ♦ 25µA Quiescent Current per Amplifier ♦ Excellent CMRR, PSRR, and Gain Linearity ♦ No Phase Reversal for Overdriven Inputs ♦ Unity-Gain Stable ♦ Stable with Any Capacitive Load ♦ Internally Short-Circuit Protected to Either Rail ______________Ordering Information PART TEMP. RANGE PINPACKAGE SOT TOP MARK MAX4162ESA MAX4162EUK MAX4163ESA MAX4163EUA MAX4164ESD -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C 8 SO 5 SOT23-5 8 SO 8 µMAX 14 SO — AABX — — — ________Typical Application Circuit _________________Pin Configurations 3V IN+ TOP VIEW 5 VDD N.C. 1 8 N.C. MAX4162 VOUT VSS 2 IN- 2 IN+ 3 4 SOT23-5 7 MAX4162 IN- MAX152 VSS IN- MAX6120 MAX4162 +1.2V VDD GND IN+ 3 6 OUT VSS 4 5 N.C. Rail-to-Rail is a registered trademark of Nippon-Motorola, Ltd. VREF+ R R -1.2V IN- SO Pin Configurations continued at end of data sheet. VDD VOUT VIN OUT 1 VDD VDD MAX4162 IN+ VREF- VOUT VSS VSS -3V MICROPOWER ±1.2V REFERENCE ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX4162/MAX4163/MAX4164 _______________General Description The MAX4162/MAX4163/MAX4164 are single/dual/quad, micropower operational amplifiers that combine an exceptional bandwidth to power consumption ratio with true rail-to-rail inputs and outputs. They consume a mere 25µA quiescent current per amplifier, yet achieve 200kHz gain-bandwidth product and are unity-gain stable while driving any capacitive load. The MAX4162/MAX4163/MAX4164 operate from either a single supply (+2.7V to +10V) or dual supplies (±1.35V to ±5V), with an input common-mode voltage range that extends 250mV beyond either supply rail. These amplifiers use a proprietary architecture to achieve a very high input common-mode rejection ratio without the mid-swing nonlinearities present in other Rail-to-Rail® op amps. This architecture also maintains high openloop gain and output swing while driving substantial loads. The combination of excellent bandwidth/power performance, single-supply operation, and miniature footprint makes these op amps ideal for portable equipment and other low-power, single-supply applications. The single MAX4162 is available in 8-pin SO and space-saving 5-pin SOT23 packages. The MAX4163 is available in an 8-pin µMAX or SO, while the MAX4164 comes in a 14-pin SO. MAX4162/MAX4163/MAX4164 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps ABSOLUTE MAXIMUM RATINGS Supply Voltage (VDD to VSS)................................................+11V IN+, IN-, OUT Voltage ......................(VDD + 0.3V) to (VSS - 0.3V) Short-Circuit Duration (to either rail)...........................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C)..............571mW 8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ...............330mW 14-Pin SO (derate 8.00mW/°C above +70°C)................640mW 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 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: +3V Operation (VDD =+3V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Operating Voltage Range CONDITIONS Inferred from PSRR test MIN TYP UNITS 10.0 V Supply Current (per amplifier) 25 40 µA Input Bias Current (Note 1) 1.0 100 pA ±0.5 ±3 ±0.5 ±4 MAX4162 Input Offset Voltage MAX4163 MAX4164 2.7 MAX TA = +25°C TA = -40°C to +85°C ±4 TA = +25°C TA = -40°C to +85°C ±5 TA = +25°C ±0.5 TA = -40°C to +85°C 2 Differential Input Resistance >10 VSS 0.25 Inferred from CMRR test Common-Mode Rejection Ratio VCM = (VSS - 0.25V) to (VDD + 0.25V) 70 100 Large-Signal Voltage Gain RL = 10kΩ 85 120 RL = 100kΩ µV/°C TΩ VDD + 0.25 Input Common-Mode Voltage Range RL = 10kΩ ±5 ±6 Input Offset Voltage Tempco Output Voltage Swing dB 30 180 VOL - VSS 30 180 VDD - VOH 3 25 3 25 VOL - VSS To either supply rail Closed-Loop Output Resistance AV = +1V/V Power-Supply Rejection Ratio VDD = 2.7V to 10V 15 V dB VDD - VOH Output Short-Circuit Current mV mV mA 0.1 Ω 110 dB Gain-Bandwidth Product 200 kHz Phase Margin 60 degrees Gain Margin 12 dB Total Harmonic Distortion f = 1kHz, VOUT = 2Vp-p, RL = 100kΩ, AV = +1V/V Slew Rate 80 0.02 % 115 V/ms Settling Time to 0.1% VOUT = 1V to 2V step 50 µs Turn-On Time VDD = 0V to 3V step, VIN = VDD / 2, AV = +1V/V 20 µs 2 _______________________________________________________________________________________ SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps (VDD =+3V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Noise Voltage Density CONDITIONS MIN f = 1kHz Differential Input Capacitance TYP MAX UNITS 80 nV/√Hz 0.7 pF Input Common-Mode Capacitance 1.5 pF Internal Charge-Pump Frequency 700 kHz Charge-Pump Output Feedthrough 100 µVp-p ELECTRICAL CHARACTERISTICS: +5V Operation (VDD = +5V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Operating Voltage Range CONDITIONS Inferred from PSRR test MIN Supply Current (per amplifier) Input Bias Current (Note 1) MAX4162 Input Offset Voltage MAX4163 MAX4164 TYP 2.7 TA = +25°C MAX UNITS 10.0 V 27 45 µA 1.0 100 pA ±0.5 ±3 TA = -40°C to +85°C ±4 TA = +25°C ±0.5 TA = -40°C to +85°C ±4 ±5 TA = +25°C ±0.5 TA = -40°C to +85°C mV ±5 ±6 Input Offset Voltage Tempco 2 µV/°C Differential Input Resistance >10 TΩ Input Common-Mode Voltage Range Inferred from CMRR test Common-Mode Rejection Ratio VCM = (VSS - 0.25V) to (VDD + 0.25V) Large-Signal Voltage Gain RL = 10kΩ Output Voltage Swing RL = 100kΩ VSS 0.25 VDD + 0.25 V 70 100 dB 85 120 dB VDD - VOH 50 300 VOL - VSS 50 300 VDD - VOH 5 40 VOL - VSS 5 40 mV Output Short-Circuit Current To either supply rail 15 Closed-Loop Output Resistance AV = +1V/V 0.1 Ω Power-Supply Rejection Ratio VDD = 4.5V to 10V 110 dB 80 mA Gain-Bandwidth Product 200 kHz Phase Margin 60 degrees Gain Margin 12 dB _______________________________________________________________________________________ 3 MAX4162/MAX4163/MAX4164 ELECTRICAL CHARACTERISTICS: +3V Operation (continued) ELECTRICAL CHARACTERISTICS: +5V Operation (continued) (VDD = +5V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS Total Harmonic Distortion MIN TYP f = 1kHz, VOUT = 2Vp-p, RL = 100kΩ, AV = +1V/V Slew Rate MAX UNITS 0.02 % 115 V/ms Settling Time to 0.1% VOUT = 1V to 4V step 70 µs Turn-On Time VDD = 0V to 5V step, VIN = VDD / 2, AV = +1V/V 40 µs Input Noise Voltage Density f = 1kHz 80 nV/√Hz Differential Input Capacitance 0.7 pF Input Common-Mode Capacitance 1.5 pF Internal Charge-Pump Frequency 700 MHz Charge-Pump Output Feedthrough 100 µVp-p Note 1: Input bias current guaranteed by design, not production tested. Note 2: The MAX4162EUK specifications are 100% tested at TA = +25°C. Limits over the extended temperature range are guaranteed by design, not production tested. __________________________________________Typical Operating Characteristics (VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE INPUT OFFSET VOLTAGE VARIATION vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. TEMPERATURE 20 15 10 24 -10 22 20 18 16 2 3 4 5 6 7 SUPPLY VOLTAGE (V) 4 8 9 10 -30 -50 -70 -90 14 -110 12 -130 -150 10 1 30 10 5 0 MAX4162-03 VCC = 3V 50 VOS (µV) SUPPLY CURRENT (µA) 25 VCC = 5V 26 MAX4162-02 28 MAX4162-01 30 SUPPLY CURRENT (µA) MAX4162/MAX4163/MAX4164 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps -40 -20 0 20 40 60 TEMPERATURE (°C) 80 100 1 2 3 4 5 6 7 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 8 9 10 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps POWER-SUPPLY REJECTION RATIO vs. FREQUENCY INPUT OFFSET VOLTAGE VARIATION vs. COMMON-MODE VOLTAGE 750 130 MAX4162-05 6 MAX4162-04 1000 4 AV = +1 110 2 0 0 -250 90 PSRR (dB) 250 VOS (µV) -2 -4 -6 50 -8 -500 -10 -750 10 -14 -20 0 20 40 60 80 -0.5 100 1.5 2.5 3.5 4.5 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) POWER-SUPPLY REJECTION RATIO vs. TEMPERATURE COMMON-MODE REJECTION vs. TEMPERATURE OPEN-LOOP GAIN vs. TEMPERATURE 70 50 30 10 60 50 40 30 20 10 0 VDD = 3V OR 5V VCM = -0.25V TO VDD + 0.25V 1000 100 10 1 -20 80 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M RL = 10kΩ 80 60 40 2.00 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) SHORT-CIRCUIT OUTPUT CURRENT vs. TEMPERATURE 1.75 1.50 1.25 1.00 0.1 100 100 MAX4162-12b AV = +1 -40 100 MAX4162-12a 10,000 80 RL = 100kΩ 120 0 COMMON-MODE INPUT CAPACITANCE vs. COMMON-MODE VOLTAGE 60 VDD = 3V OR 5V 20 OUTPUT IMPEDANCE vs. FREQUENCY 40 MAX4162-11 MAX4162-10 90 80 70 TEMPERATURE (°C) 20 140 100 40 0 20 60 TEMPERATURE (°C) 0 COMMON-MODE INPUT CAPACITANCE (pF) -20 160 SHORT-CIRCUIT OUTPUT CURRENT (mA) 90 120 110 OPEN-LOOP GAIN (dB) MAX4162-09 110 0.1 0.1 5.5 COMMON-MODE VOLTAGE (V) 130 -40 0.5 TEMPERATURE (°C) COMMON-MODE REJECTION (dB) -40 PSRR (dB) 30 -12 -1000 OUTPUT IMPEDANCE (Ω) 70 40 35 MAX4162-13 VOS (µV) 500 MAX4162-08 INPUT OFFSET VOLTAGE vs. TEMPERATURE VDD = 3V OR 5V SHORT TO EITHER SUPPLY RAIL 30 25 20 15 10 5 0 0 1.25 2.50 3.75 COMMON-MODE VOLTAGE (V) 5.00 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX4162/MAX4163/MAX4164 ____________________________Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25°C, unless otherwise noted.) ____________________________Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25°C, unless otherwise noted.) 150 100 50 VDD = 5V LOAD TO VDD / 2 90 80 VDD - VOUT(MAX) (mV) 200 VOUT(MIN) (mV) VDD - VOUT(MAX) (mV) VDD = 3V OR 5V LOAD TO VDD / 2 250 100 MAX4162-15 VDD = 3V OR 5V LOAD TO VDD / 2 250 300 MAX4162-14 300 MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 5V) MINIMUM OUTPUT VOLTAGE vs. LOAD CURRENT 200 150 100 MAX4162-16 MAXIMUM OUTPUT VOLTAGE vs. LOAD CURRENT RL = 5kΩ 70 60 50 RL = 10kΩ 40 30 20 50 RL = 100kΩ 10 0 0 0.4 0.8 1.2 1.6 0.4 0.8 1.2 1.6 2.0 -40 -20 0 20 40 60 80 LOAD CURRENT (mA) TEMPERATURE (°C) MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 5V) MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 3V) MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 3V) 60 40 70 RL = 5kΩ 40 30 RL = 10kΩ 20 100 MAX4162-19 VDD = 3V LOAD TO VDD / 2 80 VOUT(MIN) (mV) RL = 10kΩ VDD = 3V LOAD TO VDD / 2 50 90 MAX4162-18 RL = 5kΩ 80 60 MAX4162-17 VDD = 5V LOAD TO VDD / 2 100 VOUT(MIN) (mV) 0 0 LOAD CURRENT (mA) 140 120 2.0 VDD - VOUT(MAX) (mV) 0 RL = 5kΩ 60 50 RL = 10kΩ 40 30 20 10 RL = 100kΩ 20 -20 0 40 20 60 80 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) NOISE VOLTAGE DENSITY vs. COMMON-MODE VOLTAGE NOISE VOLTAGE DENSITY vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 100Hz 1kHz 80 60 10kHz 40 20 0.5 1.5 2.5 3.5 4.5 COMMON-MODE VOLTAGE (V) 5.5 AV = +1 RL = 100kΩ 80 70 60 50 40 30 Vp-p = 4.99V 0.1 Vp-p = 1V 0.01 20 10 0.001 0 0 1 100 MAX4162-21b 90 THD + NOISE (%) 100 100 MAX4162-21a MAX4162-20 120 -0.5 RL = 100kΩ 10 0 -40 100 NOISE VOLTAGE DENSITY (nV/√Hz ) -40 6 RL = 100kΩ 0 0 NOISE VOLTAGE DENSITY (nV/√Hz) MAX4162/MAX4163/MAX4164 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps 10 100 1k 10k FREQUENCY (Hz) 100k 1M 10 100 1k FREQUENCY (Hz) _______________________________________________________________________________________ 10k SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps 40 f = 5kHz GAIN (dB) THD + NOISE (%) GAIN 0.1 20 108 36 0 0 MAX4162-23 60 RL = 100kΩ CL = 500pF AV = +1000 144 72 -36 PHASE 40 -108 108 72 20 36 0 0 -36 -72 PHASE -108 -20 -144 -40 0.01 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -180 1 100 PEAK-TO-PEAK OUTPUT VOLTAGE SWING (V) MAX4162-24 RL = 100kΩ CL = 0.01µF AV = +1000 180 1M -180 1 100 1k 10k 100k 1M FREQUENCY (Hz) NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 1500pF) MAX4162-26 MAX4162-25 144 108 72 GAIN (dB) 100k NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 0pF) 20 36 0 0 -36 PHASE (degrees) GAIN 40 10k -144 -40 FREQUENCY (Hz) GAIN AND PHASE vs. FREQUENCY (CL = 0.01µF) 60 1k 180 144 GAIN -72 -20 f = 1kHz 180 GAIN (dB) RL = 100kΩ CL = 0pF AV = +1000 GAIN AND PHASE vs. FREQUENCY (CL = 500pF) PHASE (degrees) AV = +1 RL = 100kΩ MAX4162-22 60 MAX4162-21c 1 GAIN AND PHASE vs. FREQUENCY (CL = 0pF) PHASE (degrees) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING -72 -108 -20 PHASE IN (50mV/ div) IN (50mV/ div) OUT (50mV/ div) OUT (50mV/ div) -144 -40 -180 1 100 1k 10k FREQUENCY (Hz) 100k 1M TIME (100µs/div) VDD = 3V, VIN = 100mV, RL = 100kΩ to VDD / 2, CL = 0pF TIME (100µs/div) VDD = 3V, VIN = 100mV, RL = 100kΩ to VDD / 2, CL = 1500pF _______________________________________________________________________________________ 7 MAX4162/MAX4163/MAX4164 ____________________________Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25°C, unless otherwise noted.) MAX4162/MAX4163/MAX4164 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps ____________________________Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25°C, unless otherwise noted.) NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 0pF) NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 1500pF) NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 0pF) MAX4162-29 MAX4162-28 MAX4162-27 IN (50mV/ div) IN (50mV/ div) IN (1V/ div) OUT (50mV/ div) OUT (50mV/ div) OUT (1V/ div) TIME (100µs/div) TIME (100µs) TIME (100µs/div) VDD = 5V, VIN = 100mV, RL = 100kΩ to VDD / 2, CL = 1500pF VDD = 5V, VIN = 100mV, RL = 100kΩ to VDD / 2, CL = 0pF VDD = 3V, VIN = 2V, RL = 100kΩ to VDD / 2, CL = 0pF NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 0pF) NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 1500pF) MAX4162-31 MAX4162-30 IN (1V/ div) IN (2V/ div) OUT (1V/ div) OUT (2V/ div) TIME (100µs/div) VDD = 3V, VIN = 2V, RL = 100kΩ to VDD / 2, CL = 1500pF 8 TIME (100µs/div) VDD = 5V, VIN = 4V, RL = 100kΩ to VDD / 2, CL = 0pF _______________________________________________________________________________________ SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 1500pF) MAX4163/MAX4164 CROSSTALK vs. FREQUENCY MAX4162-32 MAX4162-40 0 -20 IN (2V/ div) CROSSTALK (dB) -40 OUT (2V/ div) -60 -80 -100 -120 -140 -160 TIME (100µs/div) 0.1 1 VDD = 5V, VIN = 4V, RL = 100kΩ to VDD / 2, CL = 1500pF 10 100 1000 FREQUENCY (kHz) ______________________________________________________________Pin Description PIN MAX4162 MAX4164 SO NAME FUNCTION SO SOT23-5 MAX4163 SO/µMAX 1, 5, 8 — — — N.C. 2 4 — — IN- Amplifier Inverting Input 3 3 — — IN+ Amplifier Noninverting Input 4 2 4 11 VSS Negative Power Supply 6 1 — — OUT Amplifier Output 7 5 8 4 VDD Positive Power Supply — — 1 1 OUTA — — 2 2 INA- Amplifier A Inverting Input — — 3 3 INA+ Amplifier A Noninverting Input — — 5 5 INB+ Amplifier B Noninverting Input — — 6 6 INB- Amplifier B Inverting Input — — 7 7 OUTB Amplifier B Output — — — 8 OUTC Amplifier C Output — — — 9 INC- Amplifier C Inverting Input — — — 10 INC+ Amplifier C Noninverting Input — — — 12 IND+ Amplifier D Noninverting Input — — — 13 IND- Amplifier D Inverting Input — — — 14 OUTD No Connection. Not internally connected. Amplifier A Output Amplifier D Output _______________________________________________________________________________________ 9 MAX4162/MAX4163/MAX4164 ____________________________Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25°C, unless otherwise noted.) MAX4162/MAX4163/MAX4164 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps a) b) RAIL-TO-RAIL INPUT/OUTPUT VOLTAGE RANGE (VDD = 3V) RAIL-TO-RAIL INPUT/OUTPUT VOLTAGE RANGE (VDD = 2V) MAX4162-34 MAX4162-35 3V IN (1V/ div) 2V IN (0.667V/ div) 0V 0V 2V 3V OUT (0.667V/ div) OUT (1V/ div) 0V 0V TIME (200µs/div) TIME (200µs/div) VDD = 2V, VPP = 2V, f = 1kHz, RL = 10kΩ VDD = 3V, VPP = 3V, f = 1kHz, RL = 10kΩ Figure 1. Rail-to-Rail I/O: a) VDD = 3V; b) VDD = 2V LARGE CAPACITIVE-LOAD DRIVE MAX4162-36 500mV IN (200mV/ div) 0mV 500mV OUT (200mV/ div) 0mV TIME (5µs/div) AV = +1, CL = 1µF, RL = 100kΩ Figure 2. Large Capacitive-Load Drive tion or crossover nonlinearity often encountered in other rail-to-rail op amps. Extremely low, 1.0pA input bias current makes these devices ideal for applications such as pH probes, electrometers, and ionization detectors. They are also protected against phase reversal (inferred from CMRR test) and latchup for input signals extending beyond the supply rails. The output stage achieves a lower output impedance than traditional rail-to-rail output stages, providing an output voltage range that typically swings within 150mV of the supply rails for 1mA loads. This architecture also maintains high open-loop gain and output swing while driving substantial loads. Output Loading and Stability These devices drive 1mA loads to within 150mV of the supply rails while consuming only 25µA of quiescent current. Internal compensation allows these amplifiers to remain unity-gain stable while driving any capacitive load (Figure 2). Internal Charge Pump __________Applications Information Rail-to-Rail Inputs and Outputs The MAX4162/MAX4163/MAX4164 input common-mode range extends 250mV beyond each of the supply rails, providing a substantial increase in dynamic range over other op amps (even many of those referred to as rail-torail). Although the minimum operating voltage is specified at 2.7V, the devices typically provide full rail-to-rail operation below 2.0V (Figure 1). These amplifiers do not suffer from midswing common-mode-rejection degrada10 An internal charge pump provides two internal supplies typically 2V beyond each rail. These internal rails allow the MAX4162/MAX4163/MAX4164 to achieve true railto-rail inputs and outputs, while providing excellent common-mode rejection, power-supply rejection ratios, and gain linearity. These charge pumps require no external components, and in most applications are entirely transparent to the user. Two characteristics may be visible to the user, depending on the application: ______________________________________________________________________________________ SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps 2) The charge pumps typically require up to 20µs on power-up to fully energize the internal supply rails (Figure 3). Power Supplies and Layout The MAX4162/MAX4163/MAX4164 are guaranteed to operate from a single +2.7V to +10.0V power supply, but full rail-to-rail operation typically extends below 2V. For single-supply operation, bypass the power supply with a 1µF capacitor in parallel with a 0.1µF ceramic capacitor. If operating from dual supplies, bypass each supply to ground. Good layout improves performance by decreasing the amount of stray capacitance at the op amp’s inputs and output. To decrease stray capacitance, minimize both trace and external component lead lengths, and place external components close to the op amp’s pins. b) a) POWER-UP TRANSIENT (VDD = 5V) POWER-UP TRANSIENT (VDD = 3V) MAX4162-39 MAX4162-38 5V 3V IN (2V/ div) IN (1.5V/ div) 0V 0V 2.5V 1.5V OUT (1V/ div) OUT (750mV/ div) 0V 0V TIME (100µs/div) TIME (100µs/div) VDD = 3V, VIN = VDD / 2, RL = 10kΩ, CL = 1500pF VDD = 5V, VIN = VDD / 2, RL = 10kΩ, CL = 1500pF Figure 3. Power-Up Transient: a) VDD = 3V; b) VDD = 5V _____________________________________________Pin Configurations (continued) TOP VIEW 8 VDD OUTA 1 INA- 2 7 OUTB MAX4163 INA+ 3 6 INB- VSS 4 5 INB+ SO/µMAX OUTA 1 14 OUTD INA- 2 13 IND- INA+ 3 12 IND+ VDD 4 MAX4164 INB+ 5 11 VSS 10 INC+ INB- 6 9 INC- OUTB 7 8 OUTC SO ______________________________________________________________________________________ 11 MAX4162/MAX4163/MAX4164 1) The on-board charge pumps generate a small amount of 700kHz switching noise at the op amp’s output. The amplitude of this noise is typically 100µVp-p. The noise is not referred to the input, and is independent of amplifier gain. The charge-pump switching frequency is well beyond the amplifier’s 200kHz bandwidth, and is therefore unnoticeable in most applications. ___________________Chip Information MAX4162 TRANSISTOR COUNT: 291 MAX4163 TRANSISTOR COUNT: 496 MAX4164 TRANSISTOR COUNT: 992 __________________________________________________Tape-and-Reel Information 4.0 ±0.1 1.0 ±0.1 2.0 ±0.05 1.5 +0.1/-0.0 DIAMETER 1.75 ±0.1 A 3.5 ±0.05 8.0 ±0.3 2.2 ±0.1 0.5 RADIUS TYPICAL 4.0 ±0.1 A0 A Bo 0.30 ±0.05 0.8 ±0.05 1.0 MINIMUM Ko Ao = 3.1mm ±0.1 Bo = 2.7mm ±0.1 Ko = 1.2mm ±0.1 NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. 0.30R MAX. ________________________________________________________Package Information SOT5L.EPS MAX4162/MAX4163/MAX4164 SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps 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 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.