WM8521CHCGED

Overview

The WM8521CHCGED is a stereo digital-to-analog converter (DAC) featuring an integrated output stage designed for direct 2.0Vrms line-level signal generation. It utilizes a 24-bit multi-bit sigma-delta architecture with 128x oversampling to achieve high audio fidelity, including a typical Signal-to-Noise Ratio (SNR) of 98dB and Total Harmonic Distortion (THD) of -81dB at 48kHz sampling rates. The device supports digital audio input word lengths from 16 to 32 bits and sampling frequencies ranging from 8kHz to 192kHz. It operates on independent analog and digital supplies, specifically requiring 7.6V to 13.2V for the analog section and 2.7V to 3.6V for the digital section. The component is housed in a 14-lead SOIC package.

Feature Summary

• Integrated output op-amp stage generating 2.0Vrms directly at 12V analog supply
• High-performance 24-bit multi-bit sigma-delta DAC with 98dB SNR
• Supports sampling rates from 8kHz to 192kHz
• Hardware-configurable interface supporting I2S, Right Justified, and DSP formats

Applications

• DVD Players
• Digital TV
• Digital Set Top Boxes
• A/V Receivers

Procurement Notes

Verify the specific suffix 'HC' indicates the variant optimized for 2.0Vrms output at a 12V analog supply voltage. Confirm the 'GED/R' suffix details regarding tape and reel packaging if automated assembly is required. Ensure the operating temperature range of -25°C to +85°C aligns with the target application environment.

Selection Notes

Select this component when a cost-sensitive consumer audio design requires a complete stereo DAC solution with integrated line drivers. The WM8521HC variant is suitable for systems utilizing a 12V analog rail. Designers must ensure the master clock frequency matches the supported ratios (256fs to 768fs) for the desired sampling rate up to 192kHz.

Part Context

The WM8521CHCGED belongs to the WM8521 family produced by Wolfson Microelectronics plc, now part of Cirrus Logic. This series includes pin-equivalent variants such as the WM8521H9, which provides the same 2.0Vrms output capability but is optimized for operation at a lower 9V analog supply voltage. Both variants share identical digital interfaces and packaging.

Replacement Considerations

The WM8521CH9GED serves as a direct pin-compatible alternative within the same family, offering identical functionality but designed for a 9V analog supply instead of 12V. Other Cirrus Logic or Wolfson stereo DACs may require significant circuit redesign due to differences in output stages or interface protocols.

FAQ

How is the digital audio data format selected?

The FORMAT pin (Pin 12) selects the interface mode. A logic low selects 16-bit Right Justified or 16-bit DSP Mode A, while a logic high selects 16-32-bit I2S or 16-bit DSP Mode B.

What is the function of the MUTE pin?

The MUTE pin controls soft mute functionality. Driving it high activates mute, ramping down the signal over milliseconds. Leaving it floating enables the Infinite Zero Detect (IZD) automute feature.

Does the WM8521 require an external anti-aliasing filter?

While an external single-pole RC filter is recommended for driving wideband amplifiers, the internal digital interpolation filters are often sufficient for most applications, potentially eliminating the need for complex external filtering.