xwm8722eds ETC-unknow, xwm8722eds Datasheet - Page 21

• Manufacturer Part Number: xwm8722eds
• Description: Stereo Dac With Integrated Tone Generator And Line/variable Level Outputs
• Manufacturer: ETC-unknow

WM8722
SYSTEM DIAGRAM
SQR
The WM8722 can generate three different tone types. The default setting is a sinusoidal tone.
Square waves are generated by setting the SQR bit.
F2F
A two-tone output that generates one cycle at the chosen frequency, followed by two cycles at twice
that frequency can be selected by setting the F2F bit. This facility may be used in sine or square
wave modes.
Figure 10 Digital Set Top Box Application
The WM8722 is a complete audio sub-system designed for digital set top box applications. A typical
application might require audio outputs to be routed to a VCR and television. The WM8722 allows
the user to control the output audio level being sent to the television whilst maintaining a constant
volume level to the VCR. The on-chip tone generator can be programmed to provide a audible
warning signal from the set top box to the television outputs without appearing on the line level
outputs. The WM8722 can also directly generate a mono signal for UHF outputs.
The WM8722 contains a stereo analogue input. This signal can be routed or mixed together onto the
line and variable outputs. It can be used to control the volume level of an audio output from another
audio source such as a games machine or additional set top box. Alternatively, it could be used to
provide a karaoke input from a digital effects processor.
CONNECTIVITY
FRONT END
CLOCKS
SYSTEM
MEDIA
HOME
DECODER
STORAGE
DIGITAL
(HDD)
WM8722
AUDIO
VIDEO
DAC
DAC
L
R
L
R
AMPLIFIER
AI Rev 2.1 June 2001
Advanced Information
VIDEO OUT
TONE
GENERATOR
OUTPUT
MONO AUDIO
OUTPUT
(OPTIONAL)
VARIABLE LEVEL
AUDIO OUTPUT (TV)
LINE LEVEL AUDIO
OUTPUT (VCR)
HEADPHONE
OUT
MIC OR
ANALOGUE
INPUT
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