19-1407; Rev 3; 8/99
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
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.
The outputs can swing rail-to-rail and drive a 1kΩ load
while maintaining excellent DC accuracy. The amplifier
is stable for capacitive loads up to 470pF.
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 1kΩ 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
MAX4174/5, MAX4274/5, MAX4281/2/4
†
Ordering Information
PART*
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
TOP
MARK
††
††
Applications
Portable Instruments
Instruments, Terminals,
and Bar-Code Readers
Keyless Entry
Photodiode Preamps
Smart-Card Readers
Infrared Receivers for
Remote Controls
Low-Side Current-Sense
Amplifiers
MAX4174_EUK-T
-40°C to +85°C
MAX4175_EUK-T
-40°C to +85°C
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.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
Typical Operating Circuit
+5V
V
CC
0.1µF
MAX4174
OUT 1
R
F
+
V
EE
2
R
G
IN+ 3
4
IN-
0.1µF
R
B
INPUT
0.1µF
IN-
R
G
IN+
5 V
CC
R
B
V
CC
MAX4175
OUT
V
EE
R
F
V
EE
SOT23-5
Pin Configurations continued 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.
________________________________________________________________
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
