Описание
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.
- 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
- 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation
