GENERAL DESCRIPTION

The AD7791 is a low power, complete analog front end for low frequency measurement applications. It contains a low noise 24-bit ∑-∆ ADC with one differential input that can be buffered or unbuffered.

FEATURES

Power

   Supply: 2.5 V to 5.25 V operation

   Normal: 75 µA max

   Power-down: 1 µA max

RMS noise: 1.1 µV at 9.5 Hz update rate

19.5-bit p-p resolution (22 bits effective resolution)

Integral nonlinearity: 3.5 ppm typical

Simultaneous 50 Hz and 60 Hz rejection

Internal clock oscillator

Rail-to-rail input buffer

VDD monitor channel

Temperature range: –40°C to +105°C

10-lead MSOP