WM8595 datasheet(17/82 Pages) WOLFSON

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Production Data

WM8595

PD, Rev 4.2, January 2011

DEVICE DESCRIPTION

INTRODUCTION

The WM8595 is a high performance multi-channel audio CODEC with 2Vrms line level inputs and

outputs and flexible digital input / output switching. The device comprises a 24-bit stereo ADC, two

24-bit stereo DACs with independent sampling rates and digital volume control, two stereo PGAs in

the output path, a flexible digital audio interface multiplexer, a flexible analogue input multiplexer.

Analogue inputs and outputs are all at 2Vrms line level, minimising external component count.

The DACs can operate from independent left/right clocks, bit clocks and master clocks with

independent data inputs. Alternatively, the DACs can be synchronised to use the same clocks with

independent data inputs.

The ADC uses a separate left/right clock, bit clock and master clock, allowing independent recording

and playback in audio applications. The ADC audio interface can be configured to operate in either

master or slave clocking mode. In master mode, left/right clocks and bit clocks are all outputs. In

slave mode, left/right clocks and bit clocks are all inputs.

The ADC includes digital gain control, allowing signals to be gained and attenuated between +30dB

and -97dB in 0.5dB steps.

The DACs include independent digital volume control, which is adjustable between +12dB and -100

dB in 0.5dB steps. The DACs can be configured to output stereo audio data and a range of mono

audio options.

The input analogue multiplexer accepts six stereo line level inputs at up to 2Vrms, and allows any

stereo input to be routed to the input of the ADC.

The output PGAs have optional zero cross functionality, with gain adjustable between +6dB and -

73.5dB in 0.5dB steps, and configurable soft ramp rate. Analogue audio is output at 2Vrms line level.

The digital audio interface multiplexer allows flexible routing of the digital signals internal to the

device between the independent ADC, DAC1 and DAC2 audio interfaces from the digital audio ports.

By integrating this functionality into the WM8595, the external component count and board space

normally required to switch between various digital audio sources can be significantly reduced.

Control of the internal functionality of the device is by 2-wire or 3-wire serial control interface with

readback. The interface may be asynchronous to the audio data interface as control data will be re-

synchronised to the audio processing internally. In addition, control of mute, emergency shutdown

and reset may also be achieved by pin control.

Operation using system clocks of 128fs, 192fs, 256fs, 384fs, 512fs, 768fs or 1152fs is provided. ADC

and DACs may be clocked independently. Sampling rates from 32kHz to 192kHz are supported for

both DACs provided the appropriate master clocks are input. Sampling rates from 32kHz to 96kHz

are supported for the ADC provided the appropriate master clock is input.

The audio data interface supports right justified, left justified, and I2S interface formats along with a

highly flexible DSP serial port interface format.

WM8595 Datasheet(PDF) 17 Page - Wolfson Microelectronics plc