深圳市中立信电子科技有限公司

AD7791BRMZ

模数转换器 - ADC 24-Bit SGL-Ch Ultra Low Power

Low Power, Buffered 24-Bit Sigma-Delta ADC

GENERAL DESCRIPTION

The AD7791BRMZ AD7791 is a low power, complete analog front end for low frequency measurement applications. It contains a low noise 24-bit ∑-Δ ADC with one differential input that can be buffered or unbuffered.

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 from the part is software programmable and can be varied from 9.5 Hz to 120 Hz, with the rms noise equal to 1.1 μV at the lower update rate. The internal clock frequency can be divided by a factor of 2, 4, or 8, which leads to a reduction in the current consumption. The update rate, cutoff frefrequency, and settling time will scale with the clock frequency.

FEATURES AD7791BRMZ

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

APPLICATIONS AD7791BRMZ

Smart transmitters

Battery applications

Portable instrumentation

Sensor measurement

Temperature measurement

Pressure measurement

Weigh scales

4 to 20 mA loops