3-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC With On-Chip In-Amp And Reference

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 - 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.
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 software-programmable 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 A typical and are housed in a 16-lead TSSOP package.
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
Data Sheet, Rev. B, 3/07
By Analog Devices, Inc.