WM8602 Datasheet, PDF (1/46 Pages) Wolfson Microelectronics plc – 2.1 CHANNEL PWM CONTROLLER

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2.1 Channel PWM Controller
WM8602
DESCRIPTION
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
channels, plus a reduced bandwidth sub channel are
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.
A Graphic Equaliser function is provided, plus selectable
high frequency equalisation to suit different speaker types.
Independent volume control for each channel is provided.
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.
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.
A Synchroniser allows slaving to LRCLK, thus making the
WM8602 independent of source MCLK frequency and jitter.
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.
FEATURES
• Multi-channel PWM audio amplifier controller
• Supports Stereo input
• Supports stereo or 2.1 with sub channel generation
• PWM Audio Performance with typical output stage
− 100dB SNR (‘A’ weighted @ 48kHz)
− 0.01% THD @ 1Watt
− 0.1% THD @ 30Watt
• Integrated Bass Management support with adjustable filter
• Integrated 4-band Graphic Equaliser
• Adjustable output stage filter compensation for different
speakers
• Volume control on each channel +24dB to -103.5dB in
0.5dB steps, with volume ramping and auto-mute
functions
• Programmable Dynamic Peak Compressor avoids clipping
even at high volume settings
• Internal PLL and optional crystal oscillator, supporting
Audio and MPEG standards
• 2/3-Wire MPU Serial Control Interface
• Master or Slave Clocking Mode
• Programmable Audio Data Interface Modes
− I²S, Left, Right Justified or DSP
− 16/20/24/32 bit Word Lengths
• De-emphasis support for stereo
• CMOS digital outputs
APPLICATIONS
• Hi-Fi systems
• Automotive Audio
• Boombox
• Active Speakers
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Product Preview, May 2004, Rev 1.5
Copyright 2004 Wolfson Microelectronics plc