AD7746ARUZ-REEL

ADCs/DACs - Special Purpose Overview

The AD7746ARUZ-REEL is a high-resolution, sigma-delta capacitance-to-digital converter (CDC) manufactured by Analog Devices Inc. It features two independent capacitance input channels, each configurable for single-ended or differential measurements. The device provides 24-bit resolution with up to 21 effective bits and an accuracy of 4 fF. It operates on a single supply voltage ranging from 2.7 V to 5.25 V and includes an on-chip temperature sensor with 0.1°C resolution. Communication is handled via a standard I²C-compatible serial interface.

ADCs/DACs - Special Purpose Feature Summary

• Dual-channel capacitance-to-digital conversion with ±4 pF full-scale range
• Integrated internal clock oscillator and voltage reference
• On-chip temperature sensor with ±2°C accuracy
• I²C-compatible 2-wire serial interface

ADCs/DACs - Special Purpose Applications

• Pressure measurement systems
• Position sensing applications
• Level sensing in industrial tanks
• Humidity sensing devices
• Flowmeter instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly. Confirm the specific revision level matches design requirements. Ensure ESD precautions are observed during handling due to the sensitivity of the capacitive inputs.

ADCs/DACs - Special Purpose Selection Notes

Select this model over the AD7745 variant when dual-channel simultaneous or independent capacitance measurement is required. Verify that the system power supply remains within the 2.7 V to 5.25 V range. Ensure the PCB layout accommodates the 16-lead TSSOP package dimensions.

ADCs/DACs - Special Purpose Part Context

This component belongs to the AD7745/AD7746 family of precision capacitive sensors. The AD7746 specifically distinguishes itself by offering two dedicated capacitance input channels (CIN1 and CIN2), whereas the AD7745 provides only one channel. Both share identical core ADC architecture and peripheral features.

ADCs/DACs - Special Purpose Replacement Considerations

The AD7745ARUZ serves as a functional substitute if only a single capacitance channel is needed, though it lacks the second channel found in the AD7746. No other direct pin-compatible replacements are documented in the provided source material.