AD7766BRUZ-1

Overview

The AD7766BRUZ-1 is a 24-bit, oversampled successive approximation register (SAR) analog-to-digital converter from Analog Devices Inc. It operates at an output data rate of 64 kSPS with a typical dynamic range of 112.5 dB and power consumption of 10.5 mW. The device features a built-in low-pass FIR filter with linear phase response, ±0.005 dB pass-band ripple, and 100 dB stop-band attenuation. It utilizes a 2.5 V analog/digital supply and supports logic interfaces from 1.8 V to 3.6 V. Key DC accuracy metrics include ±15 ppm maximum integral nonlinearity and 15 nV/°C zero error drift. The component is housed in a 16-lead TSSOP package and functions within a temperature range of −40°C to +105°C.

Feature Summary

• Oversampled SAR architecture providing high dynamic range and low power consumption
• Integrated digital FIR filter with linear phase response for effective out-of-band noise elimination
• Flexible serial interface supporting daisy-chaining and multi-device synchronization via SYNC/PD pin
• High DC accuracy with no missing codes and low temperature drift characteristics

Applications

• Low power PCI/USB data acquisition systems
• Low power wireless acquisition systems
• Vibration analysis instrumentation
• High precision medical acquisition devices

Procurement Notes

Verify the specific suffix 'R' indicates RoHS compliance and the 'U' denotes the TSSOP package type when sourcing. Confirm the '-1' designation corresponds to the 64 kSPS variant with 112.5 dB dynamic range. Ensure the supplier provides documentation confirming the operating voltage ranges and temperature specifications match the required application constraints.

Selection Notes

Select this model when a balance between speed and resolution is required, specifically needing 64 kSPS throughput. Consider the AD7766 if higher speed (128 kSPS) is needed, or the AD7766-2 for lower power at 32 kSPS. Evaluate the need for the integrated FIR filter to simplify external antialiasing requirements. Check compatibility with available clock frequencies and logic voltage levels before finalizing the design.

Part Context

The AD7766 series includes variants optimized for different performance trade-offs. The standard AD7766 offers 128 kSPS, while the AD7766-2 provides 32 kSPS with improved dynamic range. This specific part sits in the middle, offering 64 kSPS operation. It shares the same 24-bit resolution and SAR core architecture as its siblings but differs in decimation settings and power profiles.

Replacement Considerations

The AD7767-1 is a related device with similar serial interface capabilities but may differ in internal amplifier configurations. Verify pinout compatibility and software register mappings if substituting. The AD7766-2 offers lower power but reduced speed, while the AD7766 provides higher speed. Ensure the replacement meets the specific 112.5 dB dynamic range requirement.