ADAU1978WBCPZ-RL

Overview

The ADAU1978WBCPZ-RL is a quad analog-to-digital converter (ADC) from Analog Devices, designed for high-performance 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 electrical specifications include a dynamic range of 109 dB (A-weighted), total harmonic distortion plus noise of −95 dB, and support for sample rates from 8 kHz to 192 kHz. It integrates an on-chip phase-locked loop for master clock generation and offers I2C/SPI control interfaces.

Feature Summary

• Quad 24-bit ADCs 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
• Selectable digital high-pass filter and multiple serial audio data formats

Applications

• Automotive audio systems
• Active noise cancellation systems

Procurement Notes

Verify the specific suffix WBCPZ-RL against the manufacturer's current ordering guide to confirm package type and reel quantity. Ensure compatibility with automotive qualification standards if required for the target application. Cross-reference the datasheet revision B specifications with the component marking to validate manufacturing date codes and lot traceability.

Selection Notes

Select this component when a quad-channel ADC with low EMI characteristics is required. The internal DVDD regulator simplifies power design by requiring only a single 3.3 V external supply. Consider the 40-lead LFCSP package dimensions for PCB layout constraints. Verify that the required sample rates up to 192 kHz align with the system's processing capabilities and that I2C/SPI interface speeds are supported by the host controller.

Part Context

The ADAU1978 belongs to Analog Devices' specialized audio data converter family. It is specifically engineered for multi-channel audio acquisition where signal integrity and low noise are critical. The device complements other audio processors by providing high-resolution digitization with integrated clock management and digital filtering capabilities.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate pin-compatible alternatives only after verifying electrical parameter equivalence, particularly dynamic range and supply voltage requirements.

FAQ

How is the digital core voltage generated?

The ADAU1978 uses an internal low-dropout (LDO) regulator to generate the 1.8 V digital core voltage (DVDD) from the external 3.3 V analog supply (AVDDx).

What clock sources are supported by the on-chip PLL?

The PLL can derive the master clock from an external master clock input (MCLKIN) or from the audio frame clock (LRCLK) when operating in slave mode.

What is the function of the SA_MODE pin?

The SA_MODE pin configures the standalone mode. Connecting it to IOVDD via a pull-up resistor enables standalone operation without external microcontroller intervention.