Stereo ADC With 4 Input Selector

The WM8775 is a high performance, stereo audio ADC with a 4 channel input mixer. The WM8775 is ideal for digitising multiple analog sources for surround sound processing applications for home hi-fi, automotive and other audio visual equipment. A stereo 24-bit multi-bit Delta Sigma ADC is used with a four stereo channel input selector. Each channel has programmable gain control. Digital audio output word lengths from 16-32 bits and sampling rates from 32 kHz to 96 kHz are supported. The audio data interface supports I²S, left justified, right justified and DSP digital audio formats. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including channel selection, volume controls, mutes, de-emphasis and power management facilities. The device is available in a 28-pin SSOP package. The WM8775 is software compatible with the WM8776.


  • Four stereo ADC inputs with analog gain adjust from +24 dB to -21 dB in 0.5 dB steps
  • Digital gain adjust from -21.5 dB to -103 dB.
  • Programmable automatic level control (ALC) or limiter on ADC input
  • Three-wire SPI compatible or two-wire serial control interface
  • Master or slave clocking mode
  • Programmable audio data interface modes
  • I²S, left, right justified or DSP
  • 16/20/24/32 bit word lengths

Parametric Specifications

Channels 8
Resolution (bits) 24
Dynamic Range (dB) 102
THD+N (dB) -90
Sample Rate (kHz) 32-96
Analog Inputs/Outputs Differential
Package 28 SSOP

Technical Documents

WM8775 Product Data Sheet

Oct 1, 2008, v4.4 : 344 Kb

WM8775-EV1B Evaluation Board User Handbook

Feb 1, 2004, v1.2 : 1100 Kb



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