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
