AD7793B Datasheet PDF - ADI

●GENERAL DESCRIPTION

●The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain a low noise 16-/24-bit ∑-Δ 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 40 nV when the update rate equals 4.17 Hz.

●FEATURES

●Up to 23 bits effective resolution

●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

●3 differential inputs

●Internal clock oscillator

●Simultaneous 50 Hz/60 Hz rejection

●Programmable current sources

●On-chip bias voltage generator

●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

●Thermocouple measurements

●RTD measurements

●Thermistor measurements

●Gas analysis

●Industrial process control

●Instrumentation

●Portable instrumentation

●Blood analysis

●Smart transmitters

●Liquid/gas chromatography

●6-digit DVM