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The WM8521CH9GED is a stereo digital-to-analog converter (DAC) from Cirrus Logic, designed for consumer digital audio applications requiring a 2.0Vrms line output. It integrates an output op-amp stage to reduce external component requirements. The device utilizes a 24-bit multi-bit sigma-delta architecture with oversampling digital interpolation filters. It supports digital audio input word lengths from 16 to 32 bits and sampling rates from 8kHz to 96kHz. Key electrical parameters include a DAC signal-to-noise ratio (SNR) of 98dB ('A' weighted at 48kHz) and total harmonic distortion (THD) of -81dB ('A' weighted at 48kHz). Power supplies are specified as 8.2V to 13.2V for analog and 2.7V to 3.6V for digital.
The WM8521CH9GED belongs to the WM8521 series, which includes variants like the WM8521HC and WM8521H9. These devices are pin-equivalent and share the same 14-pin SOIC package. The 'H9' suffix indicates the specific variant optimized for 2.0Vrms output at a 9V supply, distinguishing it from the HC variant which requires 12V for the same output level.
The WM8521HC is a pin-compatible alternative within the same family, offering identical functionality but designed for a 12V supply to achieve the 2.0Vrms output. Designers must verify supply voltage compatibility when substituting between H9 and HC variants.