GENERAL DESCRIPTION
●The AD7798/AD7799 are low power, low noise, complete analog front ends 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 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.
●FEATURES
●RMS noise:
● 27 nV at 4.17 Hz (AD7799)
● 65 nV at 16.7 Hz (AD7799)
● 40 nV at 4.17 Hz (AD7798)
● 85 nV at 16.7 Hz (AD7798)
●Current: 380 µA typical
●Power-down: 1 µA maximum
●Low noise, programmable gain, instrumentation amp
●Update rate: 4.17 Hz to 470 Hz
●3 differential inputs
●Internal clock oscillator
●Simultaneous 50 Hz/60 Hz rejection
●Reference detect
●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
●Weigh scales
●Pressure measurement
●Strain gauge transducers
●Gas analysis
●Industrial process control
●Instrumentation
●Portable instrumentation
●Blood analysis
●Smart transmitters
●Liquid/gas chromotography
●6-digit DVM
