Analog Devices AD7792 Product Info

• 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

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 Σ-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.

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 μA 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