The MAX9636-MAX9638, rail-to-rail, low-noise operational amplifiers from Maxim Integrated Products (Sunnyvale, CA) are offered in 6-pin SC70 (single), 8-pin SC70 (dual), and 10-pin UTQFN (dual) packages to minimize board space. With 38 nV/rt-Hz input-voltage noise density, 50 fA/rt-Hz input-current noise density, and 0.1 pA input-bias current, the amplifiers facilitate interfacing to high-impedance sources such as photodiode and piezoelectric sensors. They are designed to operate from a 2.1 V to 5.5 V supply and suitable for use in sensor interfaces in portable medical applications that require low noise and low quiescent current. An optimized ratio of gain bandwidth to supply current allows the devices to support 1.5 MHz bandwidth. The MAX9636 and MAX9638 also offer a low-power shutdown mode that reduces supply current to 1 microamp. The amplifiers are fully specified for operation over the -40 °C to 125 °C automotive temperature range. The MAX9636 is packaged in a lead-free, 2 mm × 2.2 mm, 6-pin SC70; the MAX 9637 in a lead-free 2 mm × 2.2 mm, 8-pin SC70; and the MAX9638 in a lead-free, 1.4 mm × 1.8 mm, 10-pin UTQFN package.
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