AD7798BRU

3V/5V/ CMOS/ 500uA Signal Conditioning ADC

GENERAL DESCRIPTION

The AD7798/AD7799 is a low power, low noise, complete analog front end for high precision measurement applications. The AD7798/AD7799 contains a low noise 16/24-bit ∑-∆ ADC with three differential analog inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 30 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.

FEATURES

RMS noise: 80 nV at 16.6 Hz AD7798

           65 nV at 16.6 Hz AD7799

           30 nV at 4.17 Hz AD7799

Current: 400 µA typ

Power-down: 1 µA max

Low noise programmable gain instrumentation-amp

Update rate: 4.17 Hz to 500 Hz

3 differential inputs

Internal clock oscillator

Simultaneous 50 Hz/60 Hz rejection

Low Side Power Switch

Programmable Digital Outputs

Burnout currents

Power supply: 2.7 V to 5.25 V

–40°C to +105°C temperature range

Independent interface power supply

16-lead TSSOP package

INTERFACE

3-wire serial

SPI®-, QSPI™-, MICROWIRE™-, and DSP-compatible

Schmitt trigger on SCLK

APPLICATIONS

Pressure measurement

Weigh scales

Strain gauge transducers

Gas analysis

Industrial process control

Instrumentation

Portable instrumentation

Blood analysis

Smart transmitters

Liquid/gas chromotography

6-digit DVM