0.1µV OFFSET, 10nV/°C DRIFT OP AMPS IN TINY SOT23
SUNNYVALE, CA-May 30, 2002-Maxim Integrated Products introduces the MAX4238/MAX4239 ultra-precision op amps that use a patented auto-zero technique to achieve nearly ideal op amp specifications and still manage to squeeze into a tiny 6-pin SOT23 package. The offset voltage is an ultra-low 0.1µV (typ), 2µV (max); drift is only 10nV/°C and 50nV per 1000 hours (equivalent to 5µV over 10 years). Open-loop gain is 150dB, PSRR is 140dB, CMRR is 140dB, and noise is only 1µVP-P from DC to 10Hz. Applications including thermocouples, strain gauges, and portable medical instruments can take advantage of the uncompromising performance of these small devices.
Maxim's auto-correlating zeroing method constantly measures and compensates the input offset voltage, eliminating drift over time and temperature and the effect of 1/f noise without introducing fixed-frequency "chopper" noise. The MAX4238 and MAX4239 feature 1pA input bias current, ground-sensing input, Rail-to-Rail® outputs. They operate from a single 2.7V to 5.5V supply, and consume only 600mA quiescent supply current. An active-low shutdown mode decreases supply current to only 0.1µA.
The MAX4238 is unity-gain stable with a gain-bandwidth product of 1MHz. The MAX4239 is stable with AV > 10V/V but extends its GBWP to 6.5MHz. All devices are specified for operation over the automotive temperature range (-40°C to +125°C). The MAX4238/MAX4239 are available in 8-pin narrow SO and 6-pin SOT23 packages. Prices start at $0.85 (2500-up, FOB USA).
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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