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24-bit, 192kHz AV Receiver on-a-Chip
DESCRIPTION
The WM8777 is a high performance, multi-channel audio codec.
The WM8777 is ideal for surround sound processing applications
for home hi-fi, automotive and other audio visual equipment. A
S/PDIF transceiver with 4-channel input mux is included. Analogue
domain bass management processing, and front channel analogue
tone control facilities are provided.
A stereo 24-bit multi-bit sigma delta ADC is used with a six stereo
channel input selector. Each channel has analogue domain mute
and programmable gain control. Sampling rates from 8kHz to
192kHz are supported.
Four stereo 24-bit multi-bit sigma delta DACs are provided, which
may be used to support up to 7.1 channel operation. If preferred,
5.1 operation may be chosen, with the spare stereo DAC used to
support an Aux remote room. Sampling rates from 8kHz to 192kHz
are supported. Each DAC channel has independent digital volume
and mute control. A set of input multiplexors allows switching of an
external 5.1 analogue input, or bypass channel stereo analogue
input into the signal path. The front channel analogue signals may
be looped out of the chip prior to each master volume control, and
external filtering applied in order to select treble and bass filter
characteristics. Adjustment of tone controls is then achieved using
on-chip gain adjust amplifiers, addressed via the control interface.
Analogue bass management support is provided, plus analogue
stereo mixdown options.
The device is controlled via a serial interface giving access to all
features including channel selection, volume controls, tone
controls, mutes, de-emphasis and power management facilities.
The device is available in a 100-pin LQFP package.
WM8777
FEATURES
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AV receiver on-a-chip with 8 DACs and 2 ADCs
Integrated S/PDIF/IEC60958/AES3 transceiver
Analogue Bass Management and stereo mixdown support
Analogue tone controls for front 3 channels
Master volume control on each DAC channel with gain range
of +20dB to -100dB in 1dB steps
Audio Performance
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108dB SNR (‘A’ weighted @ 48kHz) DAC
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102dB SNR (‘A’ weighted @ 48kHz) ADC
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110dB SNR (‘A’ weighted) Analogue volume control
DAC Sampling Frequency: 8KHz – 192kHz
ADC Sampling Frequency: 8KHz – 192kHz
3-Wire SPI or 2-wire MPU Serial Control Interface with
readback.
Master or Slave Clocking Mode
Programmable Format Audio Data Interface Modes
Four Independent stereo DAC outputs with independent
digital volume controls
Integrated Stereo headphone amplifier with source select
5.1 channel analogue input prior to the tone controls, bass
management and stereo mixdown functions.
Six stereo input ADC mux with analogue gain adjust from
+24dB to –21dB in 0.5dB steps
5V Analogue, 2.7V to 3.6V Digital supply Operation
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APPLICATIONS
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Surround Sound AV Processors and Hi-Fi systems
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Product Preview, November 2004, Rev 1.94
Copyright
2004
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
