ADAU1977WBCPZ

Overview

The ADAU1977WBCPZ is a quad-channel analog-to-digital converter (ADC) with integrated diagnostics, designed for automotive audio applications. It features four direct-coupled differential inputs capable of handling 10 V rms line-level signals or connecting directly to electret microphones via an on-chip programmable bias generator (5 V to 9 V). The device utilizes a multibit sigma-delta architecture with a continuous-time front end for low EMI performance. Key electrical specifications include a 24-bit resolution, sample rates from 8 kHz to 192 kHz, and a dynamic range of 109 dB (A-weighted). It operates on a single 3.3 V supply, internally generating a 1.8 V digital core voltage, and supports I2C/SPI control interfaces.

Feature Summary

• Four high-performance ADC channels with direct-coupled differential inputs supporting up to 10 V rms full-scale input.
• Integrated diagnostic circuitry detects faults including short to battery, short to microphone bias, short to ground, short between inputs, and open terminals.
• On-chip DC-to-DC boost converter generates programmable microphone bias voltages ranging from 5 V to 9 V.
• Built-in phase-locked loop (PLL) derives the master clock from an external input or frame clock, eliminating the need for separate high-frequency oscillators.

Applications

• Automotive audio systems
• Active noise cancellation systems

Procurement Notes

Verify that the component matches the exact part number ADAU1977WBCPZ and package type LFCSP-40. Confirm the revision level corresponds to Rev. D documentation standards. Ensure the supplier provides traceability for automotive-grade qualification requirements. Check for physical integrity of the exposed pad connection, which must be grounded on the PCB.

Selection Notes

Select this component when designing systems requiring high dynamic range (109 dB) and comprehensive input fault detection for microphone arrays. It is suitable for environments where low electromagnetic interference (EMI) is critical due to its continuous-time sigma-delta architecture. Consider the internal PLL functionality if system clock distribution needs to be simplified by deriving clocks from the frame rate.

Part Context

The ADAU1977WBCPZ belongs to Analog Devices' portfolio of specialized audio data converters. It is specifically engineered for robust operation in automotive environments, featuring qualified reliability standards. The device integrates signal conditioning, conversion, and diagnostic capabilities into a single 40-lead LFCSP package, reducing the bill of materials compared to discrete solutions.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.