AD7794CRUZ-REEL

Overview

The AD7794CRUZ-REEL is a low-power, low-noise analog front end featuring a 24-bit Sigma-Delta ADC with six differential inputs. It integrates a programmable gain instrumentation amplifier (1 to 128), an internal bandgap reference, and excitation current sources. The device operates on a 2.7 V to 5.25 V supply, consuming 400 μA typically. It supports output data rates from 4.17 Hz to 470 Hz and includes simultaneous 50/60 Hz rejection. The C-grade variant functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a 24-bit Sigma-Delta ADC with six differential analog inputs and a low-noise programmable gain instrumentation amplifier.
• Includes an internal bandgap reference and programmable excitation current sources for direct sensor interfacing.
• Features a low-side power switch to minimize system power consumption by powering down bridge sensors between conversions.

Applications

• Temperature measurement
• Pressure measurement
• Weigh scales
• Strain gage transducers
• Industrial process control

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and grade specifications. Ensure that the REEL designation matches the required tape-and-reel packaging format for automated assembly processes. Cross-reference the component marking with the datasheet pinout to validate authenticity upon receipt.

Selection Notes

Select this component for high-precision applications requiring multiple differential channels in a compact form factor. Consider the integrated instrumentation amplifier for small amplitude signals and the programmable current sources for RTD or bridge sensor excitation. Verify that the 24-bit resolution and noise performance meet the specific sensitivity requirements of the target application.

Part Context

This part belongs to the AD7794/AD7795 family of complete analog front ends designed for high-precision measurement applications. The AD7794 variant provides 24-bit resolution, while the AD7795 offers 16-bit resolution. Both share similar architectures but differ in effective bits and noise performance characteristics defined in the official specifications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult the manufacturer's official documentation for any recommended replacements or updated versions of this component.

FAQ

What is the function of the PSW pin?

The PSW pin serves as a low-side power switch to ground, allowing the device to power down connected bridge sensors between conversions to minimize system power consumption.

How does the device handle clocking?

The AD7794 can operate using either its internal clock oscillator or an external clock signal applied to the CLK pin, allowing synchronization with other devices on a common clock.

What is the purpose of the Reference Detect feature?

Reference Detect monitors the external reference voltage and activates a flag if the voltage falls below specified thresholds, ensuring the integrity of the conversion reference.