Features: • Multi-channel PWM audio amplifier controller
• Supports Stereo, 5.1, 6.1 or 7.1 inputs
• Supports 2.1, 5.1 or 6.1 outputs with optional rear centrechannel 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 for 3 front channels
• Adjustable output stage filter compensation for differentspeakers
• Volume control on each 6.1 channel +24dB to -103.5dB in0.5dB steps, with volume ramping and auto-mutefunctions
• Programmable Dynamic Peak Compressor avoids clippingeven at high volume settings
• Internal PLL and optional crystal oscillator, supportingAudio 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
• Selectable CMOS or LVDS digital outputsApplication• Surround Sound AV Processors and Hi-Fi systems
• Automotive Audio
• DVD receiversPinout
Specifications
| CONDITION |
MIN |
MAX |
| Analogue supply voltage (AVDD) |
-0.3V |
+5V |
| Digital supply voltage (DVDD) |
-0.3V |
+5V |
| PWM output buffer supply voltage (BVDD) |
-0.3V |
+5V |
| Voltage range inputs |
DGND -0.3V |
DVDD +0.3V |
| Master Clock Frequency |
10MHz |
50MHz |
| Operating temperature range, TA |
-20°C |
+85°C |
| Storage temperature |
-65°C |
+150°C |
DescriptionThe WM8608 comprises a high performance multi-channelPWM digital power amplifier controller. Simply by addingappropriate power output stages a multi channel poweramplifier may be built. Six identical full audio bandwidthchannels, plus a reduced bandwidth sub channel areprovided as PWM outputs, to drive 6 speakers plus Sub.
The PCM to PWM converter supports up to 7.1 channels ofaudio, in PCM input formats. These may be mixed down to6.1 or 5.1 outputs, by mixing rear channel data into centrerear or surround speakers if required. If 5.1 channel data isinput, the surround data may be processed internally tocreate a pseudo 6.1 signal with rear channel output.
A Graphic Equaliser function is provided, plus selectablehigh frequency equalisation to suit different speaker types.Independent volume control for each channel is provided.
The WM8608 PWM controller of the WM8608 is compatible with integratedswitching output stages available from a number of vendorsor alternatively may be used with a discrete output stageconfiguration and achieve similar levels of performance.
A Dynamic Peak Compressor with programmable attackand decay times is included, which allows headroom fortone control, bass management and extra digital gain to beprovided, without clipping occurring.
A Synchroniser allows slaving to LRCLK, thus making theWM8608 independent of source MCLK frequency and jitter.
The WM8608 is controlled via a 2/3 wire serial interface. Theinterface provides access to all features including channelselection, volume controls, mutes, de-emphasis and powermanagement facilities. The device is supplied in a 48-pinTQFP package.
WM8608 Data Sheet
