WM8775

w WM8775 24-bit, 96kHz ADC with 4 Channel I/P Multiplexer DESCRIPTION The WM8775 is a high performance, stereo audio ADC with a 4 channel input mixer. The WM8775 is ideal for digitising multiple analogue sources for surround sound processing applications for home hi-fi, automotive and other audio visual equipment. A stereo 24-bit multi-bit sigma delta 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 32kHz to 96kHz 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-lead SSOP package. The WM8775 is software compatible with the WM8776. BLOCK DIAGRAM FEATURES Audio Performance − 102dB SNR (‘A’ weighted @ 48kHz) − -90dB THD ADC Sampling Frequency: 32kHz – 96kHz Four stereo ADC inputs with analogue gain adjust from +24dB to –21dB in 0.5dB steps Digital gain adjust from -21.5dB to -103dB. Programmable Automatic Level Control (ALC) or Limiter on ADC input 3-Wire SPI Compatible or 2-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...