AD7771-4BCPZ

Overview

The AD7771-4BCPZ is an 8-channel, 24-bit simultaneous sampling analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a programmable gain amplifier (PGA) per channel with gains of 1, 2, 4, and 8, supporting single-ended or true differential inputs. The device offers up to 128 kSPS output data rate (ODR) per channel and includes a sample rate converter (SRC) for coherent sampling with resolution up to 15.2 × 10⁻⁶ SPS. It operates on bipolar (±1.65 V) or unipolar (3.3 V) analog supplies and a 1.8 V to 3.6 V digital I/O supply. Performance specifications include 107 dB SNR/dynamic range at 32 kSPS in high resolution mode, -109 dB THD, ±8 ppm FSR INL, and ±15 µV offset error. The specified operating temperature range is −40°C to +105°C.

Feature Summary

• Eight full sigma-delta ADCs provide simultaneous sampling across all channels.
• Integrated low latency sinc3 and sinc5 digital filter paths allow adjustable phase synchronization.
• Built-in 12-bit SAR ADC enables system and chip diagnostics without decommissioning measurement channels.
• Two power modes optimize the balance between power dissipation and dynamic range performance.

Applications

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

Procurement Notes

Verify the specific suffix '4B' against official documentation to confirm exact grade or revision details. Ensure compatibility with required analog supply voltages and SPI interface levels before integration. Confirm package availability and lead times through authorized distributors.

Selection Notes

Select this component when simultaneous multi-channel sampling with high precision is required. Evaluate the trade-off between high resolution mode and low power mode based on thermal constraints. Verify that the input signal range matches the PGA settings and reference voltage capabilities.

Part Context

The AD7771 belongs to a family of high-performance data converters from Analog Devices designed for demanding industrial and medical applications. It shares architectural similarities with other members like the AD7770 and AD7779 but offers specific channel counts and feature sets tailored for complex signal processing tasks requiring precise timing alignment.

Replacement Considerations

Direct substitutes within the same family include the AD7770 and AD7779. Verify pinout compatibility and register mapping differences before replacement. Ensure that the alternative part supports the required number of channels and sampling rates for the specific application design.