The WM8778 is a stereo audio codec with a multi-bit Delta Sigma A/D converter featuring programmable gain with automatic level control. A stereo multi-bit Delta Sigma D/A converter is used with digital audio input word lengths from 16-32 bits and sampling rates from 32 kHz to 192 kHz. A multiplexor after the DAC allows the selection of either an external analog input or DAC playback into the line outputs. The IC supports fully independent sample rates for both the ADC and DAC, and the audio data interface supports I²S, left justified, right justified and DSP formats. The device is controlled in software via a two- or three-wire serial interface which provides access to all features including volume controls, mutes and de-emphasis facilities. It can also be controlled in hardware which gives access to the most commonly used features. Control interface selection is done via the MODE pin (tri-level).
32 to 192kHz DAC sampling frequency
32 to 96kHz ADC sampling frequency
Five stereo ADC inputs with analog gain adjust from +24 to -21dB in 0.5dB steps
Programmable limiter or automatic level control (ALC)
Stereo DAC with independent analog and digital volume controls
Stereo headphone and line output
Three-wire SPI compatible or two-wire software serial control interface
Master or slave clocking mode
Programmable audio data interface modes
Analog bypass path feature
Selectable AUX input to the volume controls
2.7V to 5.5V analog, 2.7V to 3.6V digital supply operation
Decoder or Encoder Signal Type - Audio
Decoder/Encoder Type - Analog to Digital Decoder/Encoder
Decoder/Encoder Type - Digital to Analog Decoder/Encoder
