Rainbow Electronics MAX44252 User Manual
Typical operating circuit, General description, Benefits and features
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
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Typical Operating Circuit
19-6000; Rev 0; 10/11
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to
www.maxim-ic.com/MAX44251.related.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Functional Diagrams
appear at end of data sheet.
General Description
The MAX44251/MAX44252 are 20V, ultra-precision, low-
noise, low-drift 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. These
dual and quad devices feature rail-to-rail outputs, oper-
ate from a single 2.7V to 20V supply, and consume only
1.15mA per channel, while providing 5.9nV/
√Hz input-
referred voltage noise. The ICs are unity-gain stable with
a gain-bandwidth product of 10MHz.
With excellent specifications such as offset voltage of
6µV (max), drift of 19nV/°C (max), and 123nV
P-P
noise in
0.1Hz to 10Hz, the ICs are ideally suited for applications
requiring ultra-low noise and DC precision such as inter-
facing with pressure sensors, strain gauges, precision
weight scales, and medical instrumentation.
The ICs are available in 8-pin SOT23, 8-pin µMAX
M
,
and 14-pin SOIC packages and are rated over the
-40°C to +125°C temperature range.
Benefits and Features
S
2.7V to 20V Power-Supply Range
S
Integrated EMI Filter
S
6µV Input Offset Voltage (max) at Room
Temperature
S
TCV
OS
of 19nV/°C (max)
S
Low 5.9nV/√Hz Input-Referred Voltage Noise
S
123nV
P-P
in 0.1Hz to 10Hz
S
Fast 400ns Settling Time
S
10MHz Gain-Bandwidth Product
S
Rail-to-Rail Output
S
High Accuracy Enables Precision Signal Chain
Acquisition
Applications
Strain Gauges
Pressure Transducers
Medical Instrumentation
Precision Instrumentation
Load Cell and Bridge Transducer Amplification
20V
20V
20V
3.3V
3V
V
DD
MICRO-
PROCESSOR
V
OUT
50R
G
50R
G
R
G
V
REF
V
DD
V
SS
V
IN-
V
IN+
C
1
BUFFER
BUFFER
MAX44251
MAX44251
MAX11211
MAX6126
MAX44251
R
R
20V
1.5V
BUFFER
R
R
R
1
OUTPUT
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.