MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
General Description
Benefits and Features
● High Accuracy Enables Precision Signal Chain
The MAX44250/MAX44251/MAX44252 are 20V, ultra-
precision, low-noise, low-drift amplifiers that offer near-
zero DC offset and drift through the use of patented auto-
correlating 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 single, dual, and quad devices feature rail-to-rail
outputs, operate from a single 2.7V to 20V supply or dual
±1.35V to ±10V supplies 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.
Acquisition
• 6μV Input Offset Voltage (max) at Room
Temperature
• TCV
of 19nV/°C (max)
OS
• Low 5.9nV/√Hz Input-Referred Voltage Noise
• 123nV in 0.1Hz to 10Hz
P-P
• 10MHz Gain-Bandwidth Product
• Rail-to-Rail Output
• Fast 400ns Settling Time
● 2.7V to 20V Power-Supply Range Supports
Wide Range of Sensors
With excellent specifications such as offset voltage of
● Integrated EMI Filter Reduces Impact of Radio
6µV (max), drift of 19nV/°C (max), and 123nV
noise in
P-P
Frequency Interference on Signal Chain Performance
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.
Applications
● Strain Gauges
● Pressure Transducers
The ICs are available in 5-pin SOT23, 8-pin SOT23, 8-pin
µMAX®, and 14-pin SO packages and are rated over the
-40°C to +125°C temperature range.
● Medical Instrumentation
● Precision Instrumentation
● Load Cell and Bridge Transducer Amplification
Functional Diagrams appear at end of data sheet.
Ordering Information appears at end of data sheet.
Typical Operating Circuit
3.3V
+10V
3V
MAX44251
V
OUT
R
BUFFER
R
1
MAX6126
10V
V
DD
+10V
-10V
R
V
V
REF
DD
50R
50R
G
MAX44251
R
V
BUFFER
-10V
IN+
R
G
MICRO-
G
PROCESSOR
OUTPUT
MAX11211
V
+10V
IN-
V
SS
R
BUFFER
1.5V
C
1
MAX44251
-10V
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-6000; Rev 6; 1/17