company blog about ADI AD7794BRUZ 6-Channel Low Noise Low Power 24-Bit Sigma Delta ADC With On-Chip In-Amp and Reference

ADI AD7794BRUZ 6-Channel Low Noise Low Power 24-Bit Sigma Delta ADC With On-Chip In-Amp and Reference

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

Functional Block Diagram Of AD7794BRUZ