WM8593 datasheet(17/98 Pages) WOLFSON

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WM8593

PP Rev 1.0 January 2007

DEVICE DESCRIPTION

INTRODUCTION

The WM8593 is a high performance multi-channel audio CODEC with 2Vrms line level inputs and

outputs and flexible analogue and 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, a

flexible analogue input and output multiplexer and a flexible analogue input and output 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. Each of the DAC audio interfaces can be configured to operate in ether

master or slave clocking modes. 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 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 eight stereo line level inputs at up to 2Vrms. One stereo input

can be routed to the ADC, and all eight stereo inputs can be routed to the output multiplexer.

The output analogue multiplexer includes analogue volume control with zero cross, 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 any of the five digital

audio ports. By integrating this functionality into the WM8593, the external component count and

board space normally required to switch between various digital audio sources can be significantly

reduced.

Additionally, a jack detect function is included that allows various paths within the device to be muted

when a set of headphones is detected.

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, power-down 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 I

2S interface formats along with a

highly flexible DSP serial port interface format.

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