AD7794 Datasheet PDF - ADI

●GENERAL DESCRIPTION

●The AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications. They contain a low noise, 24-/16-bit ∑-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be

●interfaced directly to the ADC.

●FEATURES

●Up to 23 effective bits

●RMS noise: 40 nV @ 4.17 Hz, 85 nV @ 16.7 Hz

●Current: 400 μA typical

●Power-down: 1 μA maximum

●Low noise, programmable gain, instrumentation amp

●Band gap reference with 4 ppm/°C drift typical

●Update rate: 4.17 Hz to 470 Hz

●Six differential analog inputs

●Internal clock oscillator

●Simultaneous 50 Hz/60 Hz rejection

●Reference detect

●Programmable current sources

●On-chip bias voltage generator

●Burnout currents

●Low-side power switch

●Power supply: 2.7 V to 5.25 V

●Temperature range:

●   B grade: –40°C to +105°C

●   C grade: –40°C to +125°C

●Independent interface power supply

●24-lead TSSOP

●3-wire serial interface

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

●   Schmitt trigger on SCLK

●APPLICATIONS

●Temperature measurement

●Pressure measurement

●Weigh scales

●Strain gage transducers

●Gas analysis