• Multi-channel CODEC with 5 stereo input selector and 3 stereo output selector
• 4-channel DAC, 2-channel ADC
• 5x2Vrms stereo input selector with 3x2 channel analogue bypass to output selector
• 3x2Vrms stereo output selector
• Stereo headphone driver
• Audio performance
  -  DAC: 100dB SNR typical (‘A’ weighted @ 48kHz)
  -  DAC: -87dB THD typical
  -  ADC: 96dB SNR typical (‘A’ weighted @ 48kHz)
  -  ADC: -80dB THD typical
• Independent sampling rate for ADC and DACs
• Independent sampling rate for DAC1 and DAC2
• DACs sampling frequency 32kHz – 192kHz
• ADC sampling frequency 32kHz – 96kHz
• DAC digital volume control +12dB to -100dB in 0.5dB steps
• ADC digital volume control from +30dB to -97dB in 0.5dB steps
• ADC input analogue boost control, selectable from 0dB, +3dB, +6dB and +12dB
• Output analogue volume control +6dB to -73.5dB in 0.5dB steps with zero cross or soft ramp to prevent pops and clicks
• Headphone drive capability on one stereo output with jack detect
• 2 and 3-wire serial control interface with readback and hardware reset, mute and powerdown pins
• Independent master or slave clocking modes
• Programmable format audio data interface modes
  -  I2S, LJ, RJ, DSP
• 3.3V / 9V analogue, 3.3V digital supply operation
• 48-lead TQFP package

The WM8594 is a high performance multi-channel audio CODEC with flexible input/output selection and digital and analogue volume control. Features include a 24-bit stereo ADC with digital gain control, two 24-bit DACs with independent volume control and clocking, and a range of input/output channel selection options with analogue volume control for flexible routing within current and future audio systems. 

The WM8594 has a five stereo input selector which accepts input levels up to 2Vrms. One stereo input can be routed to the ADC. All inputs can be routed to an output selector. 

The WM8594 outputs three stereo audio channels at line levels up to 2Vrms, which can be selected from any of the analogue inputs and DAC outputs. Additionally, one stereo output is available with a headphone driver. The DAC channels include independent digital volume control, and all three stereo output channels include analogue volume control with soft ramp. 

The WM8594 supports up to 2Vrms analogue inputs, 2Vrms outputs, with sampling rates from 32kHz to 192kHz for the DACs, and 32kHz to 96kHz for the ADC. 

The WM8594 is controlled via a serial interface with support for 2-wire and 3-wire control with full readback. Control of mute, powerdown and reset can also be achieved by pin selection. 

The WM8594 is ideal for audio applications requiring high performance and flexible routing options, including flat panel digital TV and DVD recorder. 

The WM8594 is available in a 48-lead TQFP package.