ADAU1978WBCPZ

Overview

The ADAU1978WBCPZ is a quad-channel, 24-bit analog-to-digital converter (ADC) designed for high-fidelity audio applications. It features four 2 V rms differential inputs and utilizes a multibit sigma-delta architecture with a continuous-time front end to minimize electromagnetic interference. The device operates on a single 3.3 V supply, internally generating a 1.8 V digital core voltage. Key performance metrics include a dynamic range of 109 dB and total harmonic distortion plus noise of −95 dB. It supports sample rates from 8 kHz to 192 kHz and includes an on-chip phase-locked loop for master clock generation.

Feature Summary

• Quad-channel 24-bit ADC with 109 dB dynamic range and -95 dB THD+N
• On-chip PLL supporting MCLK or LRCLK input for jitter-free clocking
• Digital volume control with autoramp and software-controllable clickless mute
• I2C/SPI control interface with selectable data formats (I2S, TDM, Left/Right Justified)

Applications

• Automotive audio systems
• Active noise cancellation systems

Procurement Notes

Verify the automotive qualification status and specific package variant when sourcing. Confirm that the ordering suffix corresponds to the required tape-and-reel or tube packaging format. Ensure compatibility with the intended I2C address or SPI configuration settings during procurement planning.

Selection Notes

Select this component for designs requiring low EMI and high dynamic range in a compact form factor. The internal DVDD regulator simplifies power design by eliminating the need for an external 1.8 V supply. Consider the 40-lead LFCSP thermal characteristics and ensure adequate PCB ground plane connectivity for the exposed pad to maintain thermal performance.

Part Context

This part belongs to the ADAU1978 family of specialized audio data converters. It is specifically qualified for automotive applications, distinguishing it from standard commercial-grade variants within the broader Analog Devices portfolio. The WBCPZ suffix indicates the specific leaded frame chip package configuration used for this automotive-qualified version.

Replacement Considerations

Direct pin-compatible replacements are not explicitly documented in the provided datasheet. Evaluate other quad-channel ADCs from the manufacturer only if they support identical 24-bit resolution, similar dynamic range specifications, and compatible serial audio interfaces.