AD7770ACPZ-RL

Overview

The AD7770ACPZ-RL is an 8-channel, 24-bit simultaneous sampling analog-to-digital converter (ADC) from Analog Devices. It features a sigma-delta architecture with per-channel programmable gain amplifiers offering gains of 1, 2, 4, and 8. The device supports output data rates up to 32 kSPS in high resolution mode and includes a sample rate converter for coherent sampling. 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. Key performance metrics include 103 dB dynamic range at 32 kSPS, -109 dB total harmonic distortion, and ±9 ppm FSR integral nonlinearity. It integrates a 2.5 V reference and a 12-bit SAR ADC for diagnostics.

Feature Summary

• Eight independent sigma-delta channels provide simultaneous sampling capabilities with low dc input current.
• Integrated sample rate converter allows fine-resolution control over the output data rate for system coherency.
• Includes a dedicated 12-bit SAR ADC for internal node sensing and functional safety diagnostics without channel loss.
• Dual power modes optimize the trade-off between dynamic range performance and power dissipation.

Applications

• Protection relays
• General-purpose data acquisition systems
• Industrial process control

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest datasheet to confirm package type and reel specifications. Ensure compatibility with the required analog supply voltage configuration, as the device supports both bipolar and unipolar operation. Confirm that the selected variant meets the necessary thermal resistance requirements for the intended PCB layout.

Selection Notes

Select this component when simultaneous multi-channel sampling with high precision is required. Evaluate the power consumption differences between high resolution and low power modes based on thermal constraints. Consider the integrated SAR ADC utility if system diagnostics are critical. Verify that the SPI interface timing aligns with the host processor capabilities.

Part Context

This part belongs to the AD777x family of high-performance data converters. It shares architectural similarities with the AD7771 and AD7779 but offers distinct channel counts and feature sets. The LFCSP-64 package provides a compact footprint suitable for dense industrial circuit boards while maintaining thermal performance through vias.

Replacement Considerations

Public confirmed substitute part numbers: AD7771ACPZ-RL, AD7779ACPZ-RL.