Maxim Intros MAX4238 and MAX4239 Op AmpsMay 13, 2002 by Jeff Shepard
Maxim Integrated Products Inc. (Sunnyvale, CA) announced its new MAX4238 and MAX4239 operational amplifiers, which provide an offset voltage of 0.1µV and a drift of 10nV per degree C, making them suitable for use in applications such as thermocouples, strain gauges and portable medical instruments. The chips also offer a loop gain of 150dB, CMRR of 140dB and noise of 1µVpp (100Hz).
The MAX4238 and MAX4239 feature an input-bias current of 1pA, ground-sensing input and rail-to-rail outputs. The amplifiers operate from a single 2.7V to 5.5V supply, and consume only 600µA. 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 has a gain-bandwidth product of 6.5MHz.
Both amplifiers are specified for operation from -40 to +125 degrees C and are available in eight-pin narrow SOP or six-pin SOT23 packages.
Pricing starts at $0.85 for quantities of 2,500 and more.