AD7747ARUZ-REEL

ADCs/DACs - Special Purpose Overview

The AD7747ARUZ-REEL is a high-resolution, sigma-delta capacitance-to-digital converter (CDC) manufactured by Analog Devices Inc. It features a 24-bit resolution with up to 19.5-bit effective noise-free resolution and ±10 fF absolute accuracy. The device interfaces directly to single or differential grounded sensors, accepting a full-scale changing capacitance range of ±8 pF and up to 17 pF common-mode capacitance. It operates on a single 2.7 V to 5.25 V supply, consumes 0.7 mA, and includes an on-chip temperature sensor with 0.1°C resolution. Communication is handled via a 2-wire I²C-compatible serial interface within the −40°C to +125°C automotive temperature range.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit Sigma-Delta Capacitance-to-Digital Converter with ±10 fF factory calibrated accuracy
• On-chip Temperature Sensor with 0.1°C resolution and ±2°C accuracy
• I²C Compatible 2-Wire Serial Interface for digital control and data readout
• Active Shielding capability to minimize parasitic capacitance effects

ADCs/DACs - Special Purpose Applications

• Pressure measurement systems
• Position and proximity sensing
• Level sensing applications
• Flow metering devices
• Impurity detection systems

ADCs/DACs - Special Purpose Procurement Notes

Verify that the ordering suffix REEL corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the specific revision matches the design requirements, as specifications are subject to change without notice. Ensure compatibility with the target I²C bus voltage levels and check for any regional distribution restrictions before finalizing procurement plans.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7747 when using capacitive sensors where one plate is connected to ground; use the AD7745 or AD7746 for floating sensors. Consider the update rate requirements, as conversion times range from 22 ms to 219.3 ms depending on desired resolution. Account for the internal reference and clock generator capabilities which eliminate the need for external components in standard capacitive sensor applications.

ADCs/DACs - Special Purpose Part Context

This component belongs to the AD774X family of capacitance-to-digital converters produced by Analog Devices Inc. It is housed in a 16-lead TSSOP package and is designed for automotive, industrial, and medical systems. The device integrates a voltage input channel and excitation control logic, distinguishing it from simpler ADCs by providing a complete solution for precision capacitive measurements.

ADCs/DACs - Special Purpose Replacement Considerations

For floating capacitive sensors, consider the AD7745 or AD7746 as alternatives. Verify pinout and register compatibility if substituting within the AD774X family, as channel counts and specific input configurations differ between models.