AD7745ARUZ

ADCs/DACs - Special Purpose Overview

The AD7745ARUZ is a single-channel, 24-bit Sigma-Delta capacitance-to-digital converter (CDC) manufactured by Analog Devices Inc. It features high resolution with up to 21 effective bits and ±4 fF accuracy. The device integrates an on-chip temperature sensor with 0.1°C resolution and a voltage input channel. It operates on a single supply from 2.7 V to 5.25 V, consuming 0.7 mA. Key specifications include a ±4 pF full-scale capacitance range, tolerance for up to 60 pF parasitic capacitance to ground, and simultaneous 50/60 Hz rejection at 16 Hz update rate. Communication is handled via a 2-wire I²C-compatible serial interface.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit Σ-Δ Capacitance-to-Digital Converter with ±4 fF factory calibrated accuracy
• Integrated on-chip temperature sensor (0.1°C resolution, ±2°C accuracy)
• Programmable digital-to-capacitance converter (CAPDAC) balancing up to 17 pF common-mode capacitance
• I²C-compatible 2-wire serial interface with internal clock oscillator

ADCs/DACs - Special Purpose Applications

• Pressure measurement systems
• Position sensing applications
• Level sensing and flowmeters
• Humidity sensing and impurity detection

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix ARUZ corresponds to the 16-lead TSSOP package variant. Confirm RoHS3 compliance status as indicated in distributor catalogs. Check for any recent Product Change Notices regarding material or manufacturing site updates before finalizing procurement orders.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7745ARUZ for single-ended or differential floating capacitive sensor interfaces requiring high precision. Ensure the application supports the 2.7 V to 5.25 V single-supply requirement. Consider the AD7746 if dual-channel capacitance measurement is needed, or the AD7747 if one sensor plate is grounded.

ADCs/DACs - Special Purpose Part Context

The AD7745ARUZ belongs to the AD7745/AD7746 family of high-resolution capacitance-to-digital converters. It shares architectural similarities with the AD7746 but provides only one capacitance input channel compared to the AD7746's two channels. Both devices utilize the same 16-lead TSSOP footprint and share identical power and interface specifications.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.