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General Description
The MAX4174/MAX4175/MAX4274/MAX4275 Gain-
Amp family combines a low-cost Rail-to-Rail
op amp
with precision internal gain-setting resistors and V
CC
/ 2
biasing. 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 only 300μA.
GainAmp amplifiers are optimally compensated for
each gain version, achieving exceptional GBW prod-
ucts up to 23MHz (A
V
= +25V/V to +101V/V). High-volt-
age fault protection withstands ±17V at either input
without excessive current draw.
Three versions are available in this amplifier family: single/
dual/quad open-loop, unity-gain stable (MAX4281/
MAX4282/MAX4284); single/dual fixed gain (MAX4174/
MAX4274); and single/dual fixed gain plus internal
V
CC
/ 2 bias at the noninverting input (MAX4175/
MAX4275), which simplifies input biasing in single-supply
designs. 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.
load
while maintaining excellent DC accuracy. The amplifier
is stable for capacitive loads up to 470pF.
Applications
Smart-Card Readers
Infrared Receivers for
Remote Controls
Low-Side Current-Sense
Amplifiers
Portable Instruments
Instruments, Terminals,
and Bar-Code Readers
Keyless Entry
Photodiode Preamps
Features
o
GainAmp Family Provides Internal Precision
Gain-Setting Resistors in SOT23 (MAX4174/5)
o
0.1% Gain Accuracy (R
F
/R
G
) (MAX4174/5,
MAX4274/5)
o
54 Standard Gains Available (MAX4174/5,
MAX4274/5)
o
Open-Loop Unity-Gain-Stable Op Amps
(MAX4281/2/4)
o
Rail-to-Rail Outputs Drive 1k
Load
o
Internal V
CC
/ 2 Biasing (MAX4175/MAX4275)
o
+2.5V to +5.5V Single Supply
o
300μA Supply Current
o
Up to 23MHz GBW Product
o
Fault-Protected Inputs Withstand ±17V
o
Stable with Capacitive Loads Up to 470pF with
No Isolation Resistor
M
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
________________________________________________________________ Maxim Integrated Products
1
19-1407; Rev 3; 8/99
PART
*
MAX4174
_EUK-T
MAX4175
_EUK-T
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
Ordering Information continued at end of data sheet.
* Insert the desired gain code (from the Gain Selection Guide)
in the blank to complete the part number.
Refer to the Gain Selection Guide for a list of preferred gains
and SOT Top Marks.
Ordering Information
GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Patent pending
Pin Configurations
Typical Operating Circuit
MAX4175
INPUT
IN-
IN+
+5V
R
B
R
B
OUT
V
CC
V
CC
V
EE
V
EE
R
G
0.1
μ
F
R
F
0.1
μ
F
0.1
μ
F
TOP VIEW
MAX4174
5
4
1
2
3
IN-
OUT
V
CC
V
EE
R
G
R
F
IN+
+
SOT23-5
Selector Guide appears at end of data sheet.
Pin Configurations continued at end of data sheet.
TOP
MARK
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