AD7793BRUZ Datasheet

Data Acquisition - Analog to Digital Converters (ADC)


The AD7793BRUZ is low power, low noise, complete analog front ends for high precision measurement applications. The AD7793BRUZ contain a low noise 16-/24-bit 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. The devices contain a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2. The devices can be operated with either the internal clock or an external clock. The output data rate from the parts is softwareprogrammable and can be varied from 4.17 Hz to 470 Hz. The parts operate with a power supply from 2.7 V to 5.25 V. They consume a current of 400 μA typical and are housed in a 16-lead TSSOP package. AD7793BRUZ 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 AD7793BRUZ 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


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