WM8608
5 to 7.1 Channel PWM Controller
DESCRIPTION
FEATURES
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Multi-channel PWM audio amplifier controller
The WM8608 comprises a high performance multi-channel
PWM digital power amplifier controller. Simply by adding
appropriate power output stages a multi-channel power
amplifier may be built. Six identical full audio bandwidth
Supports Stereo, 5.1, 6.1 or 7.1 inputs
Supports 2.1, 5.1 or 6.1 outputs with optional rear centre
channel generation
channels, plus
a reduced bandwidth sub channel are
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PWM Audio Performance with typical output stage
provided as PWM outputs, to drive 6 speakers plus Sub.
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100dB SNR (‘A’ weighted @ 48kHz)
0.01% THD @ 1Watt
The PCM to PWM converter supports up to 7.1 channels of
audio, in PCM input formats. These may be mixed down to
6.1 or 5.1 outputs, by mixing rear channel data into centre
rear or surround speakers if required. If 5.1 channel data is
input, the surround data may be processed internally to
create a pseudo 6.1 signal with rear channel output.
0.1% THD @ 30Watt
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Integrated Bass Management support with adjustable filter
Integrated 4-band Graphic Equaliser for 3 front channels
Adjustable output stage filter compensation for different
speakers
A Graphic Equaliser function is provided, plus selectable
high frequency equalisation to suit different speaker types.
Independent volume control for each channel is provided.
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Volume control on each 6.1 channel +24dB to -103.5dB in
0.5dB steps, with volume ramping and auto-mute
functions
The WM8608 PWM controller is compatible with integrated
switching output stages available from a number of vendors
or alternatively may be used with a discrete output stage
configuration and achieve similar levels of performance.
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Programmable Dynamic Peak Compressor avoids clipping
even at high volume settings
Internal PLL and optional crystal oscillator, supporting
Audio and MPEG standards
A Dynamic Peak Compressor with programmable attack
and decay times is included, which allows headroom for
tone control, bass management and extra digital gain to be
provided, without clipping occurring.
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2/3-Wire MPU Serial Control Interface
Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
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I2S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
A Synchroniser allows slaving to LRCLK, thus making the
WM8608 independent of source MCLK frequency and jitter.
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De-emphasis support for stereo
The device is controlled via a 2/3 wire serial interface. The
interface provides access to all features including channel
selection, volume controls, mutes, de-emphasis and power
management facilities. The device is supplied in a 48-pin
TQFP package.
Selectable CMOS or LVDS digital outputs
APPLICATIONS
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Surround Sound AV Processors and Hi-Fi systems
Automotive Audio
DVD receivers
Product Preview, January 2004, Rev 1.4
Copyright 2004 Wolfson Microelectronics plc
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com