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ADI AD7794BRUZ 6-Channel Low Noise Low Power 24-Bit Analog to Digital Converters

Product Description Of AD7794BRUZ

The AD7794BRUZ are low power, low noise, complete analog front ends for high precision measurement applications.They contain a low noise, 24-/16-bit ∑-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC.

Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator that is used to set the common-mode voltage of a channel to AVDD/2. The low-side power switch can be used to power down bridge sensors between conversions, minimizing the system’s power consumption. The AD7794BRUZ can operate with either an internal clock or an external clock. The output data rate from each part can vary from 4.17 Hz to 470 Hz.

Specification Of AD7794BRUZ

Input Type:Differential

Data Interface:SPI, DSP

Configuration:MUX-ADC

Number of A/D Converters:1

Architecture:Sigma-Delta

Reference Type:External, Internal

Voltage - Supply, Analog:2.7V ~ 5.25V

Voltage - Supply, Digital:2.7V ~ 5.25V

Features:PGA, Temperature Sensor

Operating Temperature:-40°C ~ 105°C

Features Of AD7794BRUZ

Up to 23 effective bits

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

Six differential analog inputs

Internal clock oscillator

Simultaneous 50 Hz/60 Hz rejection

Reference detect

Programmable current sources

On-chip bias voltage generator

Burnout currents

Low-side power switch

Power supply: 2.7 V to 5.25 V

Applications Of AD7794BRUZ

Temperature measurement

Pressure measurement

Weigh scales

Strain gage transducers

Gas analysis

Industrial process control

Instrumentation

Blood analysis

Smart transmitters

Liquid/gas chromatography

6-digit DVM