company blog about ADI AD7194BCPZ 8-Channel 4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA

ADI AD7194BCPZ 8-Channel 4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA

AD7194BCPZ is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can interface directly to the ADC.

The device can be configured to have eight differential inputs or sixteen pseudo differential inputs. The on-chip 4.92 MHz clock can be used as the clock source to the ADC or, alternatively, an external clock or crystal can be used. The output data rate from the part can be varied from 4.7 Hz to 4.8 kHz.

The device has a very flexible digital filter, including a fast settling option. Variables such as output data rate and settling time are dependent on the option selected. For applications that require all conversions to be settled, the AD7194 includes zero latency.

The part operates with a power supply from 3 V to 5.25 V. It consumes a current of 4.65 mA, and it is housed in a 32-lead LFCSP package.

Features of AD7194BCPZ
Fast settling filter option
8 differential/16 pseudo differential input channels
RMS noise: 11 nV at 4.7 Hz (gain = 128)
15.5 noise-free bits at 2.4 kHz (gain = 128)
Up to 22 noise-free bits (gain = 1)
Offset drift: ±5 nV/°C
Gain drift: ±1 ppm/°C
Programmable gain (1 to 128)
Output data rate: 4.7 Hz to 4.8 kHz
Internal or external clock
Simultaneous 50 Hz/60 Hz rejection
4 general-purpose digital outputs
Current: 4.65 mA
Temperature range: −40°C to +105°C
Package: 32-lead LFCSP

Applications of AD7194BCPZ
PLC/DCS analog input modules
Data acquisition
Strain gage transducers
Pressure measurement
Temperature measurement
Flow measurement
Weigh scales
Chromatography
Medical and scientific instrumentation

Functional Block Diagram of AD7194BCPZ