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 current to 0.1µA.
The MAX4238 is unity-gain stable with a gain-bandwidth product of 1MHz, while the decompensated MAX4239 is stable with AV ≥ 10V/V and a GBWP of 6.5MHz. The MAX4238/MAX4239 are available in 8-pin narrow SO, 6-pin TDFN and SOT23 packages.
Key Features
Applications/Uses
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
Low 10nV/°C Drift
Specified over the -40°C to +125°C Automotive Temperature Range
Low Noise: 1.5µVP-P from DC to 10Hz
150dB AVOL, 140dB PSRR, 140dB CMRR
High Gain-Bandwidth Product
1MHz (MAX4238)
6.5MHz (MAX4239)
0.1µA Shutdown Mode
Rail-to-Rail Output (RL = 1kΩ)
Low 600µA Supply Current
Ground-Sensing Input
Single 2.7V to 5.5V Supply Voltage Range
Available in a Space-Saving 6-Pin SOT23 and TDFN Packages
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