MAX4238 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers

19-2424; Rev 1; 12/02
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
General Description
The MAX4238/MAX4239 are low-noise, low-drift, ultra-
high precision amplifiers that offer near-zero DC offset
and drift through the use of patented autocorrelating
zeroing techniques. This method constantly measures
and compensates the input offset, eliminating drift over
time and temperature and the effect of 1/f noise. Both
devices feature Rail-to-Rail^® outputs, operate from a
single 2.7V to 5.5V supply, and consume only 600µA.
An active-low shutdown mode decreases supply cur-
rent to 0.1µA.
The MAX4238 is unity-gain stable with a gain-band-
width product of 1MHz, while the decompensated
MAX4239 is stable with A_V ≥ 10V/V and a GBWP of
6.5MHz. The MAX4238/MAX4239 are available in 8-pin
narrow SO and 6-pin SOT23 packages.
Applications
Thermocouples
Strain Gauges
Electronic Scales
Medical Instrumentation
Instrumentation Amplifiers
Features
o Ultra-Low, 0.1µV Offset Voltage
2.0µV (max) at +25°C
2.5µV (max) at -40°C to +85°C
3.5µV (max) at -40°C to +125°C
o Low 10nV/^oC Drift
o Specified over the -40^oC to +125^oC Automotive
Temperature Range
o Low Noise: 1.5µV_P-P from DC to 10Hz
o 150dB A_VOL, 140dB PSRR, 140dB CMRR
o High Gain-Bandwidth Product
1MHz (MAX4238)
6.5MHz (MAX4239)
o 0.1µA Shutdown Mode
o Rail-to-Rail Output (R_L = 1kΩ)
o Low 600µA Supply Current
o Ground-Sensing Input
o Single 2.7V to 5.5V Supply Voltage Range
o Available in a Space-Saving 6-Pin SOT23 Package
Typical Application Circuit
5V
360Ω
STRAIN GUAGE
18kΩ
A_V = 100
ADC
AIN
18kΩ _MAX4238/
MAX4239
Ordering Information
PART
MAX4238AUT-T
MAX4238ASA
MAX4239AUT-T
MAX4239ASA
TEMP RANGE
-40^oC to +125^oC
-40^oC to +125^oC
-40^oC to +125^oC
-40^oC to +125^oC
PIN-
PACKAGE
6 SOT23-6
8 SO
6 SOT23-6
8 SO
TOP
MARK
AAZZ
—
ABAA
—
PART
MAX4238
MAX4239
Selector Guide
MINIMUM STABLE
GAIN
1V/V
10V/V
GAIN
BANDWIDTH
(MHz)
1
6.5
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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