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19-1526; Rev 1; 10/99
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
General Description
The MAX4074–MAX4078 GainAmp™ op amp family
combines low-cost Rail-to-Rail® op amps with precision
internal gain-setting resistors. Factory-trimmed on-chip
resistors decrease design size, cost, and layout, and
provide 0.1% gain accuracy. Fixed inverting gains from
-0.25V/V to -100V/V or noninverting gains from +1.25V/V
to +101V/V are available. These devices operate from a
single +2.5V to +5.5V supply and consume just 34µA.
GainAmp amplifiers are optimally compensated for each
gain version, achieving gain bandwidth (GBW) products
up to 4MHz (AV = +25V/V to +101V/V). High-voltage
fault protection withstands ±17V at either input without
damage or excessive current draw (MAX4074/MAX4075
only).
Two versions are available in this amplifier family. The
MAX4076/MAX4077/MAX4078 are single/dual/quad
open-loop, unity-gain-stable op amps, and the
MAX4074/MAX4075 are single/dual fixed-gain op
amps. The input common-mode voltage range of the
open-loop amplifiers extends from 150mV below the
negative supply to within 1.2V of the positive supply.
The GainAmp outputs can swing rail-to-rail and drive a
1kload while maintaining excellent DC accuracy
(MAX4074/MAX4075 only). The amplifiers are stable for
capacitive loads up to 100pF.
For space-critical applications, the MAX4074/MAX4076
are available in space-saving SOT23-5 packages.
Applications
Portable Battery-Powered Equipment
Instruments, Terminals, and Bar-Code Readers
Keyless Entry
Photodiode Preamps
Smart-Card Readers
Infrared Receivers for Remote Controls
Low-Side Current-Sense Amplifiers
Gain Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Patent pending.
GainAmp is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Features
o Internal Gain-Setting Resistors in SOT23
Packages (MAX4074)
o 0.1% Gain Accuracy (RF/RG) (MAX4074/75)
o 54 Standard Gains Available (MAX4074/75)
o Open-Loop, Unity-Gain-Stable Op Amps
(MAX4076/77/78)
o Rail-to-Rail Outputs Drive 1kLoad (MAX4074/75)
o +2.5V to +5.5V Single Supply
o 34µA Supply Current (MAX4074/75)
o Up to 4MHz GBW Product
o Fault-Protected Inputs Withstand ±17V
(MAX4074/75)
o 200pA max Input Bias Current (MAX4076/77/78)
o Stable with Capacitive Loads up to 100pF
with No Isolation Resistor
Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
TOP
MARK
MAX4074__EUK-T -40°C to +70°C 5 SOT23-5
MAX4074__ESA -40°C to +70°C 8 SO
**
Ordering Information continued at end of data sheet.
Note: Insert the desired gain code in the blank to complete the
part number (see the Gain Selector Guide).
**See the Gain Selector Guide for a list of preferred gains and
top marks.
Pin Configurations/
Functional Diagrams
TOP VIEW
MAX4074
OUT 1
5 VCC
RF
VEE 2
RG
IN+ 3
4 IN-
SOT23-5
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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 1-800-835-8769.

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Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltages (VCC to VEE) ..................................-0.3V to +6V
Voltage Inputs (IN_)
MAX4076/MAX4077/MAX4078 .....(VCC + 0.3V) to (VEE - 0.3V)
MAX4074/MAX4075 ..........................................................±17V
Output Short-Circuit Duration to Either Supply (OUT_)....Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C) ............571mW
14-Pin TSSOP (derate 6.3mW/°C above +70°C) ..........500mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............330mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°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—MAX4074/MAX4075
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current (per amplifier)
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current (Note 2)
Inverting Input Resistance
Noninverting Input Resistance
SYMBOL
VCC
ICC
VOS
CONDITIONS
Guaranteed by PSRR test
VCC = 5V
VCC = 3V
RL = 1M
IIN+_
RIN_
RIN_+
AV < +25V/V
AV +25V/V
Positive Input Voltage Range
IN_+ Guaranteed by functional test (Note 3)
Negative Input Voltage Range
Power-Supply Rejection Ratio
Closed-Loop Output Impedance
IN_-
PSRR
ROUT
Output Short-Circuit Current
Output Voltage Swing (Note 4)
Guaranteed by functional test (Note 3)
VCC = 2.5V to 5.5V
Shorted to VCC
Shorted to VEE
RL = 1M
RL = 10k
RL = 1k
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
MIN
2.5
VEE -
0.15
70
TYP
37
34
0.2
0.3
0.8
300
80
1000
±15
96
0.2
5
-22
0.5
0.4
25
11
300
100
MAX
5.5
55
50
3.5
1000
UNITS
V
µA
mV
µV/°C
pA
k
VCC -
1.2
M
V
V
dB
mA
2.5
2.5
150
80
1000
600
mV
2 _______________________________________________________________________________________

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Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4074/MAX4075 (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Power-Up Time
Slew Rate
Settling Time (to 0.01%)
Input Voltage Noise Density
Input Noise Current Density
Capacitive Load Stability
DC Gain Accuracy
-3dB Bandwidth
Output settling to 1%
SR VOUT = 4V step
VOUT = 4V step
en f = 5kHz (Note 5)
f = 5kHz
CLOAD No sustained oscillations
(VEE + 25mV) < VOUT TA = +25°C
< (VCC - 25mV),
RL = 1M(Note 6) TA = TMIN to TMAX
AV = +1.25V/V
AV = +3V/V
BW (-3dB) AV = +5V/V
AV = +10V/V
AV = +25V/V
9
100
60
150
500
500
0.01
200
90
80
90
120
ms
V/ms
µs
nV/Hz
fA/Hz
pF
1.0
%
1.2
kHz
ELECTRICAL CHARACTERISTICS—MAX4076/MAX4077/MAX4078
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage Range
Supply Current (per amplifier)
Input Offset Voltage
Input Offset Voltage Drift
VCC Guaranteed by PSRR test
ICC
VCC = 5V
VCC = 3V
VOS RL = 1M
2.5 5.5 V
45 60
µA
40 55
1.2 3.5mV mV
1.5µV
µV/°C
Input Bias Current (Note 2)
Input Offset Current
IIBIAS
IOS
1
±0.4
200
pA
pA
Common-Mode Input Voltage
Range
IVR Guaranteed by CMRR
0.15
VCC -
1.2
V
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Closed-Loop Output Impedance
Output Short-Circuit Current
Large-Signal Voltage Gain
CMRR
PSRR
ROUT
AVOL
(VCC - 1.2V) VCM -0.15V
VCC = 2.5V to 5.5V
AV = +1V/V
Shorted to VCC
Shorted to VEE
0.05V < VOUT < (VCC - 0.1V), RL = 1M
0.25V < VOUT < (VCC - 0.3V), RL = 10k
0.25V < VOUT < (VCC - 0.3V), RL = 5k
70 95
70 95
0.2
4.5
20
80 117
80 95
80 93
dB
dB
mA
dB
_______________________________________________________________________________________ 3

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Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4076/MAX4077/MAX4078 (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Output Voltage Swing
Gain-Bandwidth Product
Slew Rate
Settling Time (to 0.01%)
Input Voltage Noise Density
Input Noise Current Density
Capacitive Load Stability
Power-Up Time
SYMBOL
CONDITIONS
RL = 1M
VCC - VOH
VOL - VEE
VOH/VOL RL = 10k
VCC - VOH
VOL - VEE
RL = 5k
VCC - VOH
VOL - VEE
GBW
SR VOUT = 4V step
VOUT = 4V step
en f = 5kHz
f = 5kHz
CLOAD No sustained oscillations, AV = +1V/V
Output settling to 1%
MIN TYP MAX UNITS
0.23 2.5
0.22 2.5
12 50
mV
7 50
100 100
100 100
230 kHz
90 V/ms
69 µs
110 nV/Hz
1.1 fA/Hz
100 pF
10 ms
Note 1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: The input common-mode range for IN_+ is guaranteed by a functional test. A similar test is done on the IN_- input. See the
Applications Information section for more information on the input voltage range of the GainAmps.
Note 4: For AV = -0.5V/V and AV = -0.25V/V, the output voltage swing may be limited by the input voltage range.
Note 5: Includes noise from on-chip resistors.
Note 6: The gain accuracy test is performed with the GainAmps in the noninverting configuration. The output voltage swing is limit-
ed by the input voltage range for certain gains and supply voltage conditions. For situations where the output voltage swing
is limited by the valid input range, the output limits are adjusted accordingly.
Typical Operating Characteristics
(VCC = +5.0V, RL = 100kto VCC/2, TA = +25°C, unless otherwise noted.)
MAX4074/MAX4075
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 100mVp-p
2
1
0 AV = +1.25V/V
-1 AV = +2.25V/V
-2
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 100mVp-p
2
1
0 AV = +2.5V/V
-1 AV = +4V/V
-2
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 100mVp-p
2
1
0
AV = +5V/V
-1
-2 AV = +9V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
4 _______________________________________________________________________________________

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Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
Typical Operating Characteristics
(VCC = +5.0V, RL = 100kto VCC/2, TA = +25°C, unless otherwise noted.)
MAX4074/MAX4075
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 100mVp-p
2
1
0
-1 AV = +10V/V
-2 AV = +21V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 100mVp-p
2
1
0
-1 AV = +25V/V
-2 AV = +50V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 100mVp-p
2
1
0
AV = +51V/V
-1
-2 AV = +101V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 1Vp-p
2
1
0 AV = +1.25V/V
-1
-2 AV = +2.25V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 1Vp-p
2
1
0
AV = +2.5V/V
-1
-2 AV = +4V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 1Vp-p
2
1
0
-1
-2 AV = +9V/V
-3
-4
AV = +5V/V
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 1Vp-p
2
1
0
AV = +10V/V
-1
-2 AV = +21V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 1Vp-p
2
1
0
AV = +25V/V
-1
-2 AV = +50V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3 VOUT = 1Vp-p
2
1
0
-1 AV = +51V/V
-2 AV = +101V/V
-3
-4
-5
-6
1k
10k 100k
FREQUENCY (Hz)
1M
_______________________________________________________________________________________ 5