GENERAL DESCRIPTION

The AD7788/AD7789 are low power, low noise, analog front ends for low frequency measurement applications. The AD7789 contains a low noise 24-bit ∑-∆ ADC with one differential input. The AD7788 is a 16-bit version of the AD7789. The device operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate is 16.6 Hz, which gives simultaneous 50 Hz/60 Hz rejection.

FEATURES

AD7788: 16-bit resolution

AD7789: 24-bit resolution

Power

Supply: 2.5 V to 5.25 V operation

Normal: 75 µA maximum

Power-down: 1 µA maximum

RMS noise: 1.5 µV

AD7788: 16-bit p-p resolution

AD7789: 19-bit p-p resolution (21.5 bits effective)

Integral nonlinearity: 3.5 ppm typical

Simultaneous 50 Hz and 60 Hz rejection

Internal clock oscillator

VDD monitor channel

10-lead MSOP