wm8595 Wolfson Microelectronics plc, wm8595 Datasheet - Page 17

• Manufacturer Part Number: wm8595
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
DEVICE DESCRIPTION
INTRODUCTION
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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.
PD, Rev 4.1, April 2010
WM8595
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