AD7771BCPZ

Overview

The AD7771BCPZ is an 8-channel, 24-bit simultaneous sampling analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a sigma-delta architecture with per-channel programmable gain amplifiers supporting gains of 1, 2, 4, and 8. The device provides low DC input currents of ±4 nA for differential inputs and ±8 nA for single-ended inputs in high-resolution mode. It supports output data rates up to 128 kSPS per channel and includes a sample rate converter for coherent sampling applications. The integrated internal reference operates at 2.5 V with a typical temperature coefficient of ±10 ppm/°C. Power supply requirements include bipolar (±1.65 V) or unipolar (3.3 V) analog supplies and a digital I/O supply ranging from 1.8 V to 3.6 V.

Feature Summary

• Eight fully independent sigma-delta ADC channels enable true simultaneous sampling across all inputs.
• Integrated programmable gain amplifiers allow flexible signal conditioning for various sensor types.
• Sample rate converter facilitates precise frequency alignment for coherent sampling applications.
• Built-in 12-bit SAR ADC supports system diagnostics without disabling measurement channels.

Applications

• Power quality and measurement applications
• General-purpose data acquisition systems
• Electroencephalography (EEG)
• Industrial process control

Procurement Notes

Verify the specific suffix BC against official documentation to confirm performance grade and temperature range specifications. Ensure compatibility with required power supply configurations and interface protocols before integration. Cross-reference ordering information with manufacturer catalogs to validate availability and revision status.

Selection Notes

Select this component when simultaneous multi-channel sampling is critical for phase accuracy. Evaluate the trade-off between high resolution mode dynamic range and low power mode consumption based on application constraints. Consider the integrated PGA and reference to simplify external signal conditioning circuitry requirements.

Part Context

The AD7771 belongs to a family of high-performance analog-to-digital converters designed for precision measurement. It complements other devices like the AD7770 and AD7779 within the product line, offering distinct feature sets tailored for different power and performance requirements in industrial and medical sensing environments.

Replacement Considerations

Public confirmed substitute part numbers: AD7770ACPZ, AD7779ACPZ.