AD7794CRUZ

Overview

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

Feature Summary

• Integrated 24-bit sigma-delta ADC with six differential analog input channels
• On-chip low noise instrumentation amplifier with programmable gain up to 128
• Internal precision bandgap reference with low drift characteristics
• Programmable excitation current sources for sensor biasing

Applications

• Temperature measurement systems
• Pressure measurement applications
• Weigh scales and strain gage transducers
• Industrial process control instrumentation

Procurement Notes

Verify the specific ordering suffix CRUZ against the manufacturer's official documentation to confirm package type and grade specifications. Ensure compatibility with system voltage requirements and interface protocols before integration. Cross-reference the part number with authorized distributors to validate authenticity and traceability.

Selection Notes

Select this component for high-precision applications requiring multiple differential inputs without external amplification. Consider the C-grade temperature rating for environments exceeding standard industrial limits. Evaluate the integrated reference and current sources to simplify circuit design and reduce bill of materials complexity.

Part Context

The AD7794 belongs to a family of complete analog front ends designed for high-precision measurement. It shares architectural similarities with the AD7795 but offers higher resolution. The device is housed in a 24-lead TSSOP package, suitable for space-constrained designs requiring robust signal conditioning capabilities.

Replacement Considerations

The AD7795 serves as a lower-resolution alternative within the same product family. Verify pinout compatibility and software register configurations when substituting components. Ensure that the required resolution and input channel count align with the replacement part's specifications.