AD7747ARUZ-REEL7

ADCs/DACs - Special Purpose Overview

The AD7747ARUZ-REEL7 is a high-resolution, sigma-delta capacitance-to-digital converter (CDC) manufactured by Analog Devices Inc. It features a single-ended or differential capacitive input range of ±8 pF with up to 17 pF common-mode capacitance handling. The device provides 24-bit resolution without missing codes and an effective resolution of up to 19.5 bits. Key electrical parameters include a supply voltage range of 2.7 V to 5.25 V, current consumption of 0.7 mA, and an operating temperature range of −40°C to +125°C. It integrates an on-chip temperature sensor with 0.1°C resolution and communicates via a 2-wire I²C-compatible serial interface.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit Sigma-Delta Capacitance-to-Digital Converter with ±10 fF accuracy
• Integrated internal clock oscillator and voltage reference
• On-chip temperature sensor with 0.1°C resolution and ±2°C accuracy
• Active AC shield capability for parasitic capacitance reduction

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the REEL7 suffix indicates tape-and-reel packaging containing 1000 units per manufacturer specification. Confirm the ARUZ designation corresponds to the industrial temperature grade (-40°C to +125°C) and TSSOP-16 package. Ensure compatibility with standard I²C bus protocols before integration.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7747 when interfacing with grounded single-ended or differential capacitive sensors requiring high precision. For floating capacitive sensors, consider the AD7745 or AD7746 variants instead. This component is suitable for applications demanding simultaneous rejection of 50 Hz and 60 Hz line frequencies at low update rates.

ADCs/DACs - Special Purpose Part Context

This part belongs to the AD774X family of capacitance-to-digital converters from Analog Devices. It shares architectural similarities with the AD7745 and AD7746 but is specifically optimized for grounded sensor configurations. The device eliminates external components by integrating excitation control, calibration DACs, and digital filtering.

ADCs/DACs - Special Purpose Replacement Considerations

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