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The WM8521H9GED/RV is a stereo digital-to-analog converter (DAC) manufactured by Cirrus Logic, formerly Wolfson Microelectronics. It features a 24-bit multi-bit sigma-delta architecture with oversampling digital interpolation filters. The device integrates an output op-amp stage designed to generate a 2.0 Vrms output signal directly at a 9V supply voltage, reducing external component requirements. It supports digital audio input word lengths from 16 to 32 bits and sampling rates from 8 kHz to 96 kHz. Key electrical parameters include a DAC Signal-to-Noise Ratio (SNR) of 98 dB ('A' weighted @ 48 kHz) and Total Harmonic Distortion (THD) of -81 dB ('A' weighted @ 48 kHz). Power supplies range from 8.2V to 13.2V for analog and 2.7V to 3.6V for digital sections.
The WM8521H9GED/RV belongs to the WM8521 series, which includes variants like the WM8521HC. The 'H9' suffix specifically denotes the variant optimized for 2.0 Vrms output at a 9V supply, whereas the HC variant operates at 12V. Both share pin compatibility and are housed in a 14-pin SOIC package. This part is designed for cost-sensitive consumer digital audio applications requiring high-quality line-level outputs.
The WM8521HC is a pin-compatible alternative within the same family, offering 2.0 Vrms output at a 12V supply instead of 9V. Designers must verify supply voltage constraints when substituting between H9 and HC variants. No other direct cross-model substitutes are documented in the provided source material.