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 (A
V
= +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
1kΩ load 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.
Features
o
Internal Gain-Setting Resistors in SOT23
Packages (MAX4074)
o
0.1% Gain Accuracy (R
F
/R
G
) (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 1kΩ Load (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
MAX4074–MAX4078
†
Ordering Information
PART
MAX4074__EUK-T
MAX4074__ESA
TEMP. RANGE
-40°C to +70°C
-40°C to +70°C
PIN-
PACKAGE
5 SOT23-5
8 SO
TOP
MARK
**
—
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
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
R
F
V
EE
2
5
V
CC
Gain Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
IN+
3
R
G
4
IN-
†
Patent pending.
GainAmp is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
SOT23-5
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
MAX4074–MAX4078
ABSOLUTE MAXIMUM RATINGS
Supply Voltages (V
CC
to V
EE
) ..................................-0.3V to +6V
Voltage Inputs (IN_)
MAX4076/MAX4077/MAX4078 .....(V
CC
+ 0.3V) to (V
EE
- 0.3V)
MAX4074/MAX4075..........................................................±17V
Output Short-Circuit Duration to Either Supply (OUT_). . . . Continuous
Continuous Power Dissipation (T
A
= +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
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/2, R
L
=
∞
to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at V
CC
= +5V and T
A
= +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
Positive Input Voltage Range
Negative Input Voltage Range
Power-Supply Rejection Ratio
Closed-Loop Output Impedance
Output Short-Circuit Current
I
IN+_
R
IN_
R
IN_+
IN_+
IN_-
PSRR
R
OUT
Shorted to V
CC
Shorted to V
EE
R
L
= 1MΩ
Output Voltage Swing (Note 4)
R
L
= 10kΩ
R
L
= 1kΩ
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
Guaranteed by functional test (Note 3)
Guaranteed by functional test (Note 3)
V
CC
= 2.5V to 5.5V
70
V
EE
-
0.15
±15
96
0.2
5
-22
0.5
0.4
25
11
300
100
2.5
2.5
150
80
1000
600
mV
A
V
< +25V/V
A
V
≥
+25V/V
SYMBOL
V
CC
I
CC
V
OS
V
CC
= 5V
V
CC
= 3V
R
L
= 1MΩ
CONDITIONS
Guaranteed by PSRR test
MIN
2.5
37
34
0.2
0.3
0.8
300
80
1000
V
CC
-
1.2
1000
TYP
MAX
5.5
55
50
3.5
UNITS
V
µA
mV
µV/°C
pA
kΩ
MΩ
V
V
dB
Ω
mA
2
_______________________________________________________________________________________
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4074/MAX4075 (continued)
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/2, R
L
=
∞
to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Power-Up Time
Slew Rate
Settling Time (to 0.01%)
Input Voltage Noise Density
Input Noise Current Density
Capacitive Load Stability
DC Gain Accuracy
C
LOAD
e
n
SR
SYMBOL
V
OUT
= 4V step
V
OUT
= 4V step
f = 5kHz (Note 5)
f = 5kHz
No sustained oscillations
(V
EE
+ 25mV) < V
OUT
< (V
CC
- 25mV),
R
L
= 1MΩ (Note 6)
A
V
= +1.25V/V
A
V
= +3V/V
-3dB Bandwidth
BW (-3dB) A
V
= +5V/V
A
V
= +10V/V
A
V
= +25V/V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
200
90
80
90
120
kHz
CONDITIONS
Output settling to 1%
MIN
TYP
9
100
60
150
500
500
0.01
1.0
%
1.2
MAX
UNITS
ms
V/ms
µs
nV/√Hz
fA/√Hz
pF
MAX4074–MAX4078
ELECTRICAL CHARACTERISTICS—MAX4076/MAX4077/MAX4078
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/2, R
L
=
∞
to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current (per amplifier)
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current (Note 2)
Input Offset Current
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Closed-Loop Output Impedance
Output Short-Circuit Current
I
IBIAS
I
OS
I
VR
CMRR
PSRR
R
OUT
Guaranteed by CMRR
(V
CC
- 1.2V)
≥
V
CM
≥
-0.15V
V
CC
= 2.5V to 5.5V
A
V
= +1V/V
Shorted to V
CC
Shorted to V
EE
0.05V < V
OUT
< (V
CC
- 0.1V), R
L
= 1MΩ
Large-Signal Voltage Gain
A
VOL
0.25V < V
OUT
< (V
CC
- 0.3V), R
L
= 10kΩ
0.25V < V
OUT
< (V
CC
- 0.3V), R
L
= 5kΩ
80
80
80
0.15
70
70
95
95
0.2
4.5
20
117
95
93
dB
SYMBOL
V
CC
I
CC
V
OS
V
CC
= 5V
V
CC
= 3V
R
L
= 1MΩ
CONDITIONS
Guaranteed by PSRR test
MIN
2.5
45
40
1.2
1.5µV
1
±0.4
V
CC -
1.2
200
TYP
MAX
5.5
60
55
3.5mV
UNITS
V
µA
mV
µV/°C
pA
pA
V
dB
dB
Ω
mA
_______________________________________________________________________________________
3
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
MAX4074–MAX4078
ELECTRICAL CHARACTERISTICS—MAX4076/MAX4077/MAX4078 (continued)
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/2, R
L
=
∞
to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
R
L
= 1MΩ
Output Voltage Swing
V
OH
/V
OL
R
L
= 10kΩ
R
L
= 5kΩ
Gain-Bandwidth Product
Slew Rate
Settling Time (to 0.01%)
Input Voltage Noise Density
Input Noise Current Density
Capacitive Load Stability
Power-Up Time
C
LOAD
e
n
GBW
SR
V
OUT
= 4V step
V
OUT
= 4V step
f = 5kHz
f = 5kHz
No sustained oscillations, A
V
= +1V/V
Output settling to 1%
CONDITIONS
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
MIN
TYP
0.23
0.22
12
7
100
100
230
90
69
110
1.1
100
10
MAX
2.5
2.5
50
50
100
100
kHz
V/ms
µs
nV/√Hz
fA/√Hz
pF
ms
mV
UNITS
Note 1:
All devices are 100% production tested at T
A
= +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 A
V
= -0.5V/V and A
V
= -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
(V
CC
= +5.0V, R
L
= 100kΩ to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
MAX4074/MAX4075
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 tocc1-2
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 tocc3-4
SMALL-SIGNAL GAIN vs. FREQUENCY
3
2
1
GAIN (dB)
V
OUT
= 100mVp-p
MAX4074-8 tocc5-6
4
3
2
1
GAIN (dB)
V
OUT
= 100mVp-p
4
3
2
1
GAIN (dB)
V
OUT
= 100mVp-p
4
0
-1
-2
-3
-4
-5
-6
1k
10k
A
V
= +2.25V/V
A
V
= +1.25V/V
0
-1
-2
-3
-4
-5
-6
A
V
= +4V/V
A
V
= +2.5V/V
0
-1
-2
-3
-4
-5
-6
A
V
= +9V/V
A
V
= +5V/V
100k
1M
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
Typical Operating Characteristics
(V
CC
= +5.0V, R
L
= 100kΩ to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
MAX4074–MAX4078
MAX4074/MAX4075
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc04
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc05
SMALL-SIGNAL GAIN vs. FREQUENCY
3
2
1
GAIN (dB)
0
-1
-2
-3
-4
-5
-6
A
V
= +101V/V
A
V
= +51V/V
V
OUT
= 100mVp-p
MAX4074-8 toc06
4
3
2
1
GAIN (dB)
A
V
= +10V/V
A
V
= +21V/V
V
OUT
= 100mVp-p
4
3
2
1
GAIN (dB)
0
-1
-2
-3
-4
-5
-6
A
V
= +50V/V
A
V
= +25V/V
V
OUT
= 100mVp-p
4
0
-1
-2
-3
-4
-5
-6
1k
10k
100k
1M
FREQUENCY (Hz)
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc07
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc08
LARGE-SIGNAL GAIN vs. FREQUENCY
3
2
1
V
OUT
= 1Vp-p
MAX4074-8 toc09
4
3
2
1
GAIN (dB)
V
OUT
= 1Vp-p
4
3
2
1
GAIN (dB)
V
OUT
= 1Vp-p
4
A
V
= +1.25V/V
A
V
= +2.25V/V
-1
-2
-3
-4
-5
-6
1k
10k
100k
1M
FREQUENCY (Hz)
-1
-2
-3
-4
-5
-6
1k
A
V
= +2.5V/V
A
V
= +4V/V
GAIN (dB)
0
0
0
-1
-2
-3
-4
-5
-6
A
V
= +9V/V
A
V
= +5V/V
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc10
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc11
LARGE-SIGNAL GAIN vs. FREQUENCY
3
2
1
V
OUT
= 1Vp-p
MAX4074-8 toc12
4
3
2
1
GAIN (dB)
V
OUT
= 1Vp-p
4
3
2
1
GAIN (dB)
V
OUT
= 1Vp-p
4
-1
-2
-3
-4
-5
-6
1k
10k
A
V
= +21V/V
A
V
= +10V/V
-1
-2
-3
-4
-5
-6
A
V
= +50V/V
A
V
= +25V/V
GAIN (dB)
0
0
0
-1
-2
-3
-4
-5
-6
A
V
= +101V/V
A
V
= +51V/V
100k
1M
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
5
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