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General Description
The MAX4074MAX4078 GainAmpTM 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 34A.
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
1k
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.
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
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 1k Load (MAX4074/75)
o +2.5V to +5.5V Single Supply
o 34A 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
MAX4074MAX4078
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
________________________________________________________________ Maxim Integrated Products
1
TOP VIEW
MAX4074
5
4
1
2
3
IN-
OUT
V
CC
V
EE
R
G
R
F
IN+
SOT23-5
19-1526; Rev 1; 10/99
Pin Configurations/
Functional Diagrams
Patent pending.
GainAmp is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Ordering Information
Pin Configurations continued at end of data sheet.
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.
8 SO
5 SOT23-5
PIN-
PACKAGE
TEMP. RANGE
-40C to +70C
-40C to +70C
MAX4074__ESA
MAX4074__EUK-T
PART
--
**
TOP
MARK
Typical Operating Circuit appears at end of data sheet.
Gain Selector Guide appears at end of data sheet.
MAX4074MAX4078
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
= +25C.) (Note 1)
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.
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
= +70C)
5-Pin SOT23 (derate 7.1mW/C above +70C) ............571mW
14-Pin TSSOP (derate 6.3mW/C above +70C) ..........500mW
8-Pin MAX (derate 4.1mW/C above +70C) ..............330mW
8-Pin SO (derate 5.88mW/C above +70C).................471mW
14-Pin SO (derate 8.33mW/C above +70C)...............667mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
Supply Current (per amplifier)
I
CC
34
50
A
V
CC
= 3V
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Inverting Input Resistance
R
IN_
80
k
V
CC
- V
OH
300
Input Bias Current (Note 2)
I
IN+_
0.8
1000
pA
Input Offset Voltage Drift
0.3
V/C
Noninverting Input Resistance
R
IN_+
1000
M
Negative Input Voltage Range
IN_-
15
V
Power-Supply Rejection Ratio
PSRR
70
96
dB
Supply Voltage Range
V
CC
2.5
5.5
V
300
1000
37
55
Input Offset Voltage
V
OS
0.2
3.5
mV
Closed-Loop Output Impedance
R
OUT
0.2
V
CC
- V
OH
5
Output Short-Circuit Current
-22
mA
0.5
2.5
V
OL
- V
EE
Output Voltage Swing (Note 4)
100
600
mV
R
L
= 1k
V
CC
- V
OH
25
150
V
OL
- V
EE
Positive Input Voltage Range
IN_+
11
80
R
L
= 10k
V
OL
- V
EE
CONDITIONS
A
V
+25V/V
Shorted to V
CC
A
V
< +25V/V
Shorted to V
EE
V
EE
-
V
CC
-
0.15
1.2
Guaranteed by functional test (Note 3)
V
CC
= 2.5V to 5.5V
V
Guaranteed by functional test (Note 3)
0.4
2.5
Guaranteed by PSRR test
V
CC
= 5V
R
L
= 1M
R
L
= 1M
MAX4074MAX4078
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
_______________________________________________________________________________________
3
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
= +25C.) (Note 1)
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
= +25C.) (Note 1)
90
80
90
-3dB Bandwidth
BW (-3dB)
120
kHz
A
V
= +3V/V
A
V
= +5V/V
A
V
= +10V/V
A
V
= +25V/V
200
A
V
= +1.25V/V
Input Noise Current Density
500
fA/
Hz
Capacitive Load Stability
C
LOAD
500
pF
DC Gain Accuracy
0.01
1.0
%
f = 5kHz
No sustained oscillations
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Power-Up Time
9
ms
Slew Rate
SR
100
V/ms
Settling Time (to 0.01%)
60
s
Input Voltage Noise Density
e
n
150
nV/
Hz
CONDITIONS
Output settling to 1%
V
OUT
= 4V step
V
OUT
= 4V step
f = 5kHz (Note 5)
1.2
T
A
= +25C
(V
EE
+ 25mV) < V
OUT
< (V
CC
- 25mV),
R
L
= 1M
(Note 6)
T
A
= T
MIN
to T
MAX
Supply Current (per amplifier)
I
CC
40
55
A
V
CC
= 3V
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Input Bias Current (Note 2)
I
IBIAS
1
200
pA
Input Offset Voltage Drift
1.5V
V/C
Power-Supply Rejection Ratio
PSRR
70
95
dB
Supply Voltage Range
V
CC
2.5
5.5
V
80
93
45
60
Input Offset Voltage
V
OS
1.2
3.5mV
mV
Closed-Loop Output Impedance
R
OUT
0.2
4.5
Output Short-Circuit Current
20
mA
80
117
Large-Signal Voltage Gain
A
VOL
dB
0.25V < V
OUT
< (V
CC
- 0.3V), R
L
= 5k
80
95
Common-Mode Input Voltage
Range
I
VR
0.25V < V
OUT
< (V
CC
- 0.3V), R
L
= 10k
CONDITIONS
A
V
= +1V/V
Shorted to V
CC
Shorted to V
EE
0.15
V
CC -
1.2
V
CC
= 2.5V to 5.5V
V
Guaranteed by CMRR
Guaranteed by PSRR test
V
CC
= 5V
0.05V < V
OUT
< (V
CC
- 0.1V), R
L
= 1M
R
L
= 1M
Input Offset Current
I
OS
0.4
pA
Common-Mode Rejection Ratio
CMRR
70
95
dB
(V
CC
- 1.2V)
V
CM
-0.15V
MAX4074MAX4078
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
4
_______________________________________________________________________________________
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
= +25C.) (Note 1)
R
L
= 1M
0.22
2.5
CONDITIONS
V
OL
- V
EE
R
L
= 10k
7
50
V
OL
- V
EE
12
50
V
CC
- V
OH
R
L
= 5k
mV
100
100
V
OH
/V
OL
Output Voltage Swing
V
OL
- V
EE
0.23
2.5
V
CC
- V
OH
100
100
V
CC
- V
OH
kHz
GBW
Gain-Bandwidth Product
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
230
V
OUT
= 4V step
V/ms
SR
Slew Rate
90
V
OUT
= 4V step
s
Settling Time (to 0.01%)
69
f = 5kHz
nV/
Hz
e
n
Input Voltage Noise Density
110
f = 5kHz
fA/
Hz
Input Noise Current Density
1.1
No sustained oscillations, A
V
= +1V/V
pF
C
LOAD
Capacitive Load Stability
100
Note 1: All devices are 100% production tested at T
A
= +25C. 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.
Output settling to 1%
ms
Power-Up Time
10
3
-6
1k
1M
100k
10k
SMALL-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 tocc1-2
FREQUENCY (Hz)
GAIN (dB)
A
V
= +2.25V/V
A
V
= +1.25V/V
V
OUT
= 100mVp-p
3
-6
1k
1M
10k
100k
SMALL-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 tocc3-4
FREQUENCY (Hz)
GAIN (dB)
A
V
= +4V/V
A
V
= +2.5V/V
V
OUT
= 100mVp-p
3
-6
1k
1M
10k
100k
SMALL-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 tocc5-6
FREQUENCY (Hz)
GAIN (dB)
A
V
= +9V/V
A
V
= +5V/V
V
OUT
= 100mVp-p
Typical Operating Characteristics
(V
CC
= +5.0V, R
L
= 100k
to V
CC
/2, T
A
= +25C, unless otherwise noted.)
MAX4074/MAX4075
MAX4074MAX4078
Micropower, SOT23, Rail-to-Rail,
Fixed-Gain, GainAmp/Open-Loop Op Amps
_______________________________________________________________________________________
5
3
-6
1k
1M
100k
10k
SMALL-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc04
FREQUENCY (Hz)
GAIN (dB)
A
V
= +21V/V
A
V
= +10V/V
V
OUT
= 100mVp-p
3
-6
1k
1M
100k
10k
SMALL-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc05
FREQUENCY (Hz)
GAIN (dB)
A
V
= +25V/V
A
V
= +50V/V
V
OUT
= 100mVp-p
3
-6
1k
1M
100k
10k
SMALL-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc06
FREQUENCY (Hz)
GAIN (dB)
A
V
= +51V/V
A
V
= +101V/V
V
OUT
= 100mVp-p
3
-6
1k
1M
100k
10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc07
FREQUENCY (Hz)
GAIN (dB)
A
V
= +1.25V/V
A
V
= +2.25V/V
V
OUT
= 1Vp-p
3
-6
1k
1M
100k
10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc08
FREQUENCY (Hz)
GAIN (dB)
A
V
= +2.5V/V
A
V
= +4V/V
V
OUT
= 1Vp-p
3
-6
1k
1M
100k
10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc09
FREQUENCY (Hz)
GAIN (dB)
A
V
= +5V/V
A
V
= +9V/V
V
OUT
= 1Vp-p
Typical Operating Characteristics
(V
CC
= +5.0V, R
L
= 100k
to V
CC
/2, T
A
= +25C, unless otherwise noted.)
MAX4074/MAX4075
3
-6
1k
1M
100k
10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc10
FREQUENCY (Hz)
GAIN (dB)
A
V
= +10V/V
A
V
= +21V/V
V
OUT
= 1Vp-p
3
-6
1k
1M
100k
10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc11
FREQUENCY (Hz)
GAIN (dB)
A
V
= +25V/V
A
V
= +50V/V
V
OUT
= 1Vp-p
3
-6
1k
1M
100k
10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-5
1
-1
4
-2
-4
2
0
MAX4074-8 toc12
FREQUENCY (Hz)
GAIN (dB)
A
V
= +51V/V
A
V
= +101V/V
V
OUT
= 1Vp-p
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