WM8602
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2.1 Channel PWM Controller
DESCRIPTION
FEATURES
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Multi-channel PWM audio amplifier controller
Supports Stereo input
The WM8602 comprises a high performance stereo + sub
PWM digital power amplifier controller. Simply by adding
appropriate power output stages a 2.1 channel power
amplifier may be built. Two identical full audio bandwidth
Supports stereo or 2.1 with sub channel generation
PWM Audio Performance with typical output stage
channels, plus
a reduced bandwidth sub channel are
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100dB SNR (‘A’ weighted @ 48kHz)
0.01% THD @ 1Watt
provided as PWM outputs.
The PCM to PWM converter supports up to 2 channels of
audio, in PCM input formats. The on board bass
management enables the generation of a sub channel from
the stereo PCM data.
0.1% THD @ 30Watt
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Integrated Bass Management support with adjustable filter
Integrated 4-band Graphic Equaliser
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 channel +24dB to -103.5dB in
0.5dB steps, with volume ramping and auto-mute
functions
The WM8602 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
I2S, Left, Right Justified or DSP
A Synchroniser allows slaving to LRCLK, thus making the
WM8602 independent of source MCLK frequency and jitter.
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16/20/24/32 bit Word Lengths
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De-emphasis support for stereo
CMOS digital outputs
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 28-pin
SSOP package.
APPLICATIONS
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Hi-Fi systems
Automotive Audio
Boombox
Active Speakers
Product Preview, May 2004, Rev 1.5
WOLFSON MICROELECTRONICS plc
Copyright 2004 Wolfson Microelectronics plc
www.wolfsonmicro.com