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19-1195; Rev 0; 4/97
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps
_______________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 25A 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(R) 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 MAX or SO, while the MAX4164 comes in a 14-pin SO.
____________________________Features
o 5-Pin SOT23 Package (MAX4162) o 1.0pA Typical Input Bias Current o Fully Specified Single-Supply Operation at 3V and 5V o Input Common-Mode Voltage Range Extends 250mV Beyond Either Supply Rail o Rail-to-Rail Output Swing o 200kHz Gain-Bandwidth Product o 25A Quiescent Current per Amplifier o Excellent CMRR, PSRR, and Gain Linearity o No Phase Reversal for Overdriven Inputs o Unity-Gain Stable o Stable with Any Capacitive Load o Internally Short-Circuit Protected to Either Rail
MAX4162/MAX4163/MAX4164
______________Ordering Information
PART MAX4162ESA MAX4162EUK MAX4163ESA MAX4163EUA MAX4164ESD TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 8 SO 5 SOT23-5 8 SO 8 MAX 14 SO SOT TOP MARK -- AABX -- -- --
________________________Applications
Battery-Powered Devices pH Probes Portable Equipment Low-Power, Low-Voltage Equipment Medical Instruments Ionization Detectors Cellular Phones
________Typical Application Circuit
3V
_________________Pin Configurations
TOP VIEW
VIN OUT 1 5 VDD N.C. 1 IN- 2 8 7 N.C. VOUT IN+ VDD VOUT
MAX4162
VDD
MAX6120
VSS 2
INR R
VSS +1.2V
MAX152
VREF+ VREF-
MAX4162
MAX4162
IN+ 3 4 INVSS 4 6 5
VDD GND OUT N.C.
-1.2V INVDD
MAX4162
IN+ 3
SOT23-5
SO
IN+
VOUT
VSS
VSS -3V
Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon-Motorola, Ltd.
MICROPOWER 1.2V REFERENCE 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
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 = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C)..............571mW 8-Pin SO (derate 5.88mW/C above +70C)..................471mW 8-Pin MAX (derate 4.1mW/C above +70C) ...............330mW 14-Pin SO (derate 8.00mW/C above +70C)................640mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+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 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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Voltage Range Supply Current (per amplifier) Input Bias Current (Note 1) MAX4162 Input Offset Voltage MAX4163 MAX4164 Input Offset Voltage Tempco Differential Input Resistance Input Common-Mode Voltage Range Common-Mode Rejection Ratio Large-Signal Voltage Gain Inferred from CMRR test VCM = (VSS - 0.25V) to (VDD + 0.25V) RL = 10k RL = 10k Output Voltage Swing RL = 100k Output Short-Circuit Current Closed-Loop Output Resistance Power-Supply Rejection Ratio Gain-Bandwidth Product Phase Margin Gain Margin Total Harmonic Distortion Slew Rate Settling Time to 0.1% Turn-On Time VOUT = 1V to 2V step VDD = 0V to 3V step, VIN = VDD / 2, AV = +1V/V f = 1kHz, VOUT = 2Vp-p, RL = 100k, AV = +1V/V VDD - VOH VOL - VSS VDD - VOH VOL - VSS VSS 0.25 70 85 100 120 30 30 3 3 15 0.1 80 110 200 60 12 0.02 115 50 20 180 180 25 25 mA dB kHz degrees dB % V/ms s s mV TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 2 >10 VDD + 0.25 0.5 0.5 CONDITIONS Inferred from PSRR test MIN 2.7 25 1.0 0.5 TYP MAX 10.0 40 100 3 4 4 5 5 6 V/C T V dB dB mV UNITS V A pA
To either supply rail AV = +1V/V VDD = 2.7V to 10V
2
_______________________________________________________________________________________
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS: +3V Operation (continued)
(VDD =+3V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Noise Voltage Density Differential Input Capacitance Input Common-Mode Capacitance Internal Charge-Pump Frequency Charge-Pump Output Feedthrough f = 1kHz CONDITIONS MIN TYP 80 0.7 1.5 700 100 MAX UNITS nV/Hz pF pF kHz Vp-p
MAX4162/MAX4163/MAX4164
ELECTRICAL CHARACTERISTICS: +5V Operation
(VDD = +5V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Voltage Range Supply Current (per amplifier) Input Bias Current (Note 1) MAX4162 Input Offset Voltage MAX4163 MAX4164 Input Offset Voltage Tempco Differential Input Resistance Input Common-Mode Voltage Range Common-Mode Rejection Ratio Large-Signal Voltage Gain RL = 10k Output Voltage Swing RL = 100k Output Short-Circuit Current Closed-Loop Output Resistance Power-Supply Rejection Ratio Gain-Bandwidth Product Phase Margin Gain Margin VDD - VOH VOL - VSS VDD - VOH VOL - VSS Inferred from CMRR test VCM = (VSS - 0.25V) to (VDD + 0.25V) VSS 0.25 70 85 100 120 50 50 5 5 15 0.1 80 110 200 60 12 300 300 40 40 mA dB kHz degrees dB mV TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 2 >10 VDD + 0.25 0.5 0.5 CONDITIONS Inferred from PSRR test MIN 2.7 27 1.0 0.5 TYP MAX 10.0 45 100 3 4 4 5 5 6 V/C T V dB dB mV UNITS V A pA
To either supply rail AV = +1V/V VDD = 4.5V to 10V
_______________________________________________________________________________________
3
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
ELECTRICAL CHARACTERISTICS: +5V Operation (continued)
(VDD = +5V, VSS = 0V, VCM = VDD / 2, VOUT = VDD / 2, RL tied to VDD / 2, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Total Harmonic Distortion Slew Rate Settling Time to 0.1% Turn-On Time Input Noise Voltage Density Differential Input Capacitance Input Common-Mode Capacitance Internal Charge-Pump Frequency Charge-Pump Output Feedthrough VOUT = 1V to 4V step VDD = 0V to 5V step, VIN = VDD / 2, AV = +1V/V f = 1kHz CONDITIONS f = 1kHz, VOUT = 2Vp-p, RL = 100k, AV = +1V/V MIN TYP 0.02 115 70 40 80 0.7 1.5 700 100 MAX UNITS % V/ms s s nV/Hz pF pF MHz Vp-p
Note 1: Input bias current guaranteed by design, not production tested. Note 2: The MAX4162EUK specifications are 100% tested at TA = +25C. Limits over the extended temperature range are guaranteed by design, not production tested.
__________________________________________Typical Operating Characteristics
(VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4162-01
SUPPLY CURRENT vs. TEMPERATURE
26 SUPPLY CURRENT (A) 24 22 20 18 16 14 VOS (V) VCC = 3V VCC = 5V
MAX4162-02
INPUT OFFSET VOLTAGE VARIATION vs. SUPPLY VOLTAGE
30 10 -10 -30 -50 -70 -90 -110 -130 -150
MAX4162-03
30 25 SUPPLY CURRENT (A) 20 15 10 5
28
50
12 0 1 2 3 4 5 6 7 8 9 10 SUPPLY VOLTAGE (V) 10 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
1
2
3
4
5
6
7
8
9
10
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps
____________________________Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25C, unless otherwise noted.)
MAX4162/MAX4163/MAX4164
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4162-04
INPUT OFFSET VOLTAGE VARIATION vs. COMMON-MODE VOLTAGE
MAX4162-05
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
AV = +1 110 90 PSRR (dB) 70 50 30 10
MAX4162-08
1000 750 500 VOS (V)
6 4 2 0 VOS (V) -2 -4 -6 -8
130
250 0 -250 -500 -750
-10 -12 -14 -40 -20 0 20 40 60 80 100 -0.5 0.5 1.5 2.5 3.5 4.5 5.5 TEMPERATURE (C) COMMON-MODE VOLTAGE (V)
-1000
0.1
1
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO vs. TEMPERATURE
MAX4162-09
COMMON-MODE REJECTION vs. TEMPERATURE
MAX4162-10
OPEN-LOOP GAIN vs. TEMPERATURE
140 OPEN-LOOP GAIN (dB) 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 VDD = 3V OR 5V RL = 100k RL = 10k
MAX4162-11
130 110 90 PSRR (dB) 70 50 30 10 -40 -20 0 20 40 60 80
120 COMMON-MODE REJECTION (dB) 110 100 90 80 70 60 50 40 30 20 10 0 -40 VDD = 3V OR 5V VCM = -0.25V TO VDD + 0.25V -20 40 0 20 60 TEMPERATURE (C) 80
160
100
100
TEMPERATURE (C)
TEMPERATURE (C)
OUTPUT IMPEDANCE vs. FREQUENCY
COMMON-MODE INPUT CAPACITANCE (pF)
MAX4162-12a
COMMON-MODE INPUT CAPACITANCE vs. COMMON-MODE VOLTAGE
MAX4162-12b
SHORT-CIRCUIT OUTPUT CURRENT vs. TEMPERATURE
SHORT-CIRCUIT OUTPUT CURRENT (mA) 35 30 25 20 15 10 5 0 -40 -20 0 20 40 60 80 100 VDD = 3V OR 5V SHORT TO EITHER SUPPLY RAIL
MAX4162-13
10,000 AV = +1 OUTPUT IMPEDANCE () 1000
2.00
40
1.75
100
1.50
10
1
1.25
0.1 0.1 1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
1.00 0 1.25 2.50 3.75 5.00 COMMON-MODE VOLTAGE (V)
TEMPERATURE (C)
_______________________________________________________________________________________
5
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
____________________________Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25C, unless otherwise noted.)
MAXIMUM OUTPUT VOLTAGE vs. LOAD CURRENT
MAX4162-14
MINIMUM OUTPUT VOLTAGE vs. LOAD CURRENT
MAX4162-15
MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 5V)
90 80 VDD - VOUT(MAX) (mV) 70 60 50 40 30 20 10 RL = 100k -40 -20 0 20 40 60 80 100 RL = 10k VDD = 5V LOAD TO VDD / 2
MAX4162-16
300 250 VDD - VOUT(MAX) (mV) 200 150 100 50 0 0
VDD = 3V OR 5V LOAD TO VDD / 2
300 250 VOUT(MIN) (mV) 200 150 100 50 0
100
VDD = 3V OR 5V LOAD TO VDD / 2
RL = 5k
0.4
0.8
1.2
1.6
2.0
0 0 0.4 0.8 1.2 1.6 2.0 LOAD CURRENT (mA) TEMPERATURE (C)
LOAD CURRENT (mA)
MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 5V)
MAX4162-17
MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 3V)
MAX4162-18
MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE (VDD = 3V)
80 70 VOUT(MIN) (mV) 60 50 40 30 20 RL = 10k VDD = 3V LOAD TO VDD / 2 RL = 5k
MAX4162-19
140 120 100 VOUT(MIN) (mV) 80 60 40 20 0 -40 -20 0 20 40 60 80 RL = 100k RL = 10k VDD = 5V LOAD TO VDD / 2 RL = 5k
60 50 VDD - VOUT(MAX) (mV) 40 30 20 10 0 RL = 10k VDD = 3V LOAD TO VDD / 2 RL = 5k
90
RL = 100k -40 -20 0 20 40 60 80 100
10 0 -40 -20 0 20
RL = 100k 40 60 80 100
100
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
NOISE VOLTAGE DENSITY vs. COMMON-MODE VOLTAGE
MAX4162-20
NOISE VOLTAGE DENSITY vs. FREQUENCY
MAX4162-21a
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
AV = +1 RL = 100k THD + NOISE (%) Vp-p = 4.99V
MAX4162-21b
120 NOISE VOLTAGE DENSITY (nV/Hz) 100 80 60 40 20 0 -0.5 0.5 1.5 2.5 3.5 4.5 100Hz 1kHz
100 NOISE VOLTAGE DENSITY (nV/Hz ) 90 80 70 60 50 40 30 20 10 0
1
0.1
10kHz
0.01
Vp-p = 1V
0.001 10 100 1k 10k 100k 1M 10 100 1k 10k FREQUENCY (Hz) FREQUENCY (Hz)
5.5
COMMON-MODE VOLTAGE (V)
6
_______________________________________________________________________________________
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
____________________________Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING
MAX4162-21c
GAIN AND PHASE vs. FREQUENCY (CL = 0pF)
60
MAX4162-22
1 AV = +1 RL = 100k f = 5kHz THD + NOISE (%)
GAIN AND PHASE vs. FREQUENCY (CL = 500pF)
180 144 108 PHASE (degrees) 72 36 0 40 GAIN GAIN (dB) 20 60
MAX4162-23
180 144 108 PHASE (degrees) 72 36 0
40 GAIN GAIN (dB) 20
RL = 100k CL = 0pF AV = +1000
RL = 100k CL = 500pF AV = +1000
0.1
0 PHASE
-36 -72
0 PHASE -20
-36 -72
f = 1kHz 0.01 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 PEAK-TO-PEAK OUTPUT VOLTAGE SWING (V)
-20
-108 -144
-108 -144
-40 1 100 1k 10k 100k 1M FREQUENCY (Hz)
-180
-40 1 100 1k 10k 100k 1M FREQUENCY (Hz)
-180
GAIN AND PHASE vs. FREQUENCY (CL = 0.01F)
60 GAIN
MAX4162-24
NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 0pF)
180 144 108 PHASE (degrees) 72 IN (50mV/ div) IN (50mV/ div)
MAX4162-25
NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 1500pF)
MAX4162-26
40 GAIN (dB)
RL = 100k CL = 0.01F AV = +1000
20
36 0
0
-36 -72
-20 PHASE -40 1 100 1k 10k 100k 1M FREQUENCY (Hz)
-108 -144 -180
OUT (50mV/ div)
OUT (50mV/ div)
TIME (100s/div) VDD = 3V, VIN = 100mV, RL = 100k to VDD / 2, CL = 0pF
TIME (100s/div) VDD = 3V, VIN = 100mV, RL = 100k to VDD / 2, CL = 1500pF
_______________________________________________________________________________________
7
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
____________________________Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25C, unless otherwise noted.)
NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 0pF)
MAX4162-27
NONINVERTING SMALL-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 1500pF)
MAX4162-28
NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 0pF)
MAX4162-29
IN (50mV/ div)
IN (50mV/ div)
IN (1V/ div)
OUT (50mV/ div)
OUT (50mV/ div)
OUT (1V/ div)
TIME (100s/div) VDD = 5V, VIN = 100mV, RL = 100k to VDD / 2, CL = 0pF
TIME (100s) VDD = 5V, VIN = 100mV, RL = 100k to VDD / 2, CL = 1500pF
TIME (100s/div) VDD = 3V, VIN = 2V, RL = 100k to VDD / 2, CL = 0pF
NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 3V, CL = 1500pF)
MAX4162-30
NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 0pF)
MAX4162-31
IN (1V/ div)
IN (2V/ div)
OUT (1V/ div)
OUT (2V/ div)
TIME (100s/div) VDD = 3V, VIN = 2V, RL = 100k to VDD / 2, CL = 1500pF
TIME (100s/div) VDD = 5V, VIN = 4V, RL = 100k to VDD / 2, CL = 0pF
8
_______________________________________________________________________________________
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps
____________________________Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = VDD / 2, TA = +25C, unless otherwise noted.)
MAX4162/MAX4163/MAX4164
NONINVERTING LARGE-SIGNAL PULSE RESPONSE (VDD = 5V, CL = 1500pF)
MAX4162-32
MAX4163/MAX4164 CROSSTALK vs. FREQUENCY
-20 -40 CROSSTALK (dB) -60 -80 -100 -120 -140 -160
MAX4162-40
0
IN (2V/ div)
OUT (2V/ div)
TIME (100s/div) VDD = 5V, VIN = 4V, RL = 100k to VDD / 2, CL = 1500pF
0.1
1
10 FREQUENCY (kHz)
100
1000
______________________________________________________________Pin Description
PIN MAX4162 SO 1, 5, 8 2 3 4 6 7 -- -- -- -- -- -- -- -- -- -- -- -- SOT23-5 -- 4 3 2 1 5 -- -- -- -- -- -- -- -- -- -- -- -- MAX4163 SO/MAX -- -- -- 4 -- 8 1 2 3 5 6 7 -- -- -- -- -- -- MAX4164 SO -- -- -- 11 -- 4 1 2 3 5 6 7 8 9 10 12 13 14 NAME FUNCTION
N.C. ININ+ VSS OUT VDD OUTA INAINA+ INB+ INBOUTB OUTC INCINC+ IND+ INDOUTD
No Connection. Not internally connected. Amplifier Inverting Input Amplifier Noninverting Input Negative Power Supply Amplifier Output Positive Power Supply Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output Amplifier C Output Amplifier C Inverting Input Amplifier C Noninverting Input Amplifier D Noninverting Input Amplifier D Inverting Input Amplifier D Output
_______________________________________________________________________________________
9
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
a)
RAIL-TO-RAIL INPUT/OUTPUT VOLTAGE RANGE (VDD = 3V)
MAX4162-35
b)
RAIL-TO-RAIL INPUT/OUTPUT VOLTAGE RANGE (VDD = 2V)
MAX4162-34
3V IN (1V/ div) 0V 3V OUT (1V/ div) 0V TIME (200s/div) VDD = 3V, VPP = 3V, f = 1kHz, RL = 10k
2V IN (0.667V/ div) 0V 2V OUT (0.667V/ div) 0V TIME (200s/div) VDD = 2V, VPP = 2V, f = 1kHz, RL = 10k
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)
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.
0mV
Output Loading and Stability
These devices drive 1mA loads to within 150mV of the supply rails while consuming only 25A of quiescent current. Internal compensation allows these amplifiers to remain unity-gain stable while driving any capacitive load (Figure 2).
TIME (5s/div) AV = +1, CL = 1F, RL = 100k
Figure 2. Large Capacitive-Load Drive
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
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 100Vp-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. 2) The charge pumps typically require up to 20s 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 1F capacitor in parallel with a 0.1F 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.
MAX4162/MAX4163/MAX4164
a)
POWER-UP TRANSIENT (VDD = 3V)
MAX4162-38
b)
POWER-UP TRANSIENT (VDD = 5V)
MAX4162-39
3V IN (1.5V/ div) 0V IN (2V/ div)
5V
0V
1.5V OUT (750mV/ div) OUT (1V/ div) 0V TIME (100s/div)
2.5V
0V
TIME (100s/div) VDD = 3V, VIN = VDD / 2, RL = 10k, CL = 1500pF
VDD = 5V, VIN = VDD / 2, RL = 10k, CL = 1500pF
Figure 3. Power-Up Transient: a) VDD = 3V; b) VDD = 5V
_____________________________________________Pin Configurations (continued)
TOP VIEW
OUTA 1 OUTA 1 INA- 2 INA+ 3 VSS 4 8 VDD 7 OUTB INA- 2 INA+ 3 VDD 4 INB+ 5 INB- 6 14 OUTD 13 IND12 IND+
MAX4163
6 INB5 INB+
MAX4164
11 VSS 10 INC+ 9 8 INCOUTC
SO/MAX
OUTB 7
SO
______________________________________________________________________________________
11
SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Amps MAX4162/MAX4163/MAX4164
___________________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 1.5 +0.1/-0.0 DIAMETER 2.0 0.05 1.75 0.1 A
3.5 0.05 2.2 0.1
8.0 0.3
0.5 RADIUS TYPICAL Bo 0.30 0.05 0.8 0.05 0.30R MAX.
4.0 0.1
A0 A
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.
________________________________________________________Package Information
SOT5L.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) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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