WM8569_06 Wolfson Microelectronics Ltd., WM8569_06 Datasheet - Page 15

• Manufacturer Part Number: WM8569_06
• Description: 24-bit, 192khz Stereo Codec with Volume Control
• Manufacturer: Wolfson Microelectronics Ltd.

Production Data
HARDWARE CONTROL MODES
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Table 6 System Clock Frequencies Versus Sampling Rate
When the MODE pin is held high, the following hardware modes of operation are available.
Note: When in hardware mode the ADC and DAC will only run in slave mode.
MUTE AND AUTOMUTE OPERATION
In both hardware and software modes, MUTE controls the selection of MUTE directly, and can be
used to enable and disable the automute function. This pin becomes an output when left floating and
indicates infinite ZERO detect (IZD) has been detected.
Table 7 Mute and Automute Control
Figure 9 shows the application and release of MUTE whilst a full amplitude sinusoid is being played
at 48kHz sampling rate. When MUTE (lower trace) is asserted, the output (upper trace) begins to
decay exponentially from the DC level of the last input sample. The output will decay towards V
with a time constant of approximately 64 input samples. If MUTE is applied to all channels for 1024
or more input samples the outputs will be connected directly to V
asserted, the output will restart immediately from the current input sample.
Figure 9 Application and Release of Soft Mute
SAMPLING
(DACLRC/
ADCLRC)
44.1kHz
192kHz
-0.5
-1.5
-2.5
32kHz
48kHz
96kHz
1.5
0.5
RATE
Floating
-1
-2
1
0
0
0
1
DAC only
5.6448
12.288
24.576
4.096
6.144
128fs
0.001
Normal Operation
Mute DAC channels
Enable IZD, MUTE becomes an output to indicate when IZD occurs.
L=IZD detected, H=IZD not detected.
DAC only
18.432
36.864
6.144
8.467
9.216
192fs
0.002
System Clock Frequency (MHz)
Unavailable Unavailable Unavailable Unavailable
11.2896
Time(s)
12.288
24.576
8.192
0.003
256fs
DESCRIPTION
16.9340
12.288
18.432
36.864
0.004
384fs
MID
Unavailable Unavailable
if IZD is set. When MUTE is de-
22.5792
0.005
16.384
24.576
512fs
PD Rev 4.0 June 2006
0.006
33.8688
24.576
36.864
768fs
WM8569
MID
15