WM8777_05 Datasheet, PDF (1/103 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz AV Receiver on-a-Chip

w
WM8777
24-bit, 192kHz AV Receiver on-a-Chip
DESCRIPTION
FEATURES
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 multiplexers 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 mix down 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.
• 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
− 108dB SNR (‘A’ weighted @ 48kHz) DAC
− 102dB SNR (‘A’ weighted @ 48kHz) ADC
− 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 read
back.
• 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 mix down 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
APPLICATIONS
• Surround Sound AV Processors and Hi-Fi systems
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Pre-Production, January 2005, Rev 3.0
Copyright 2005 Wolfson Microelectronics plc