WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 13

• Manufacturer Part Number: WM8766
• Description: 24-bit, 192khz 6-channel Dac
• Manufacturer: Wolfson Microelectronics plc

Production Data
HARDWARE CONTROL MODES
w
Table 6 System Clock Frequencies Versus Sampling Rate
When the MODE pin is held high, the following hardware modes of operation are available.
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. When MUTE is de-asserted, the output will
restart almost immediately from the current input sample.
Figure 9 Application and Release of Soft Mute
SAMPLING
-0.5
-1.5
-2.5
1.5
0.5
(LRCLK)
44.1kHz
-1
-2
192kHz
1
0
32kHz
48kHz
96kHz
RATE
Floating
0
0
1
5.6448
12.288
24.576
0.001
4.096
6.144
128fs
Normal Operation
Mute DAC channels
Enable IZD, MUTE becomes an output to indicate when IZD occurs.
L=IZD not detected, H=IZD detected.
18.432
36.864
6.144
8.467
9.216
192fs
0.002
System Clock Frequency (MHz)
Unavailable Unavailable Unavailable Unavailable
11.2896
12.288
24.576
8.192
Time(s)
256fs
0.003
DESCRIPTION
16.9340
12.288
18.432
36.864
384fs
0.004
Unavailable Unavailable
22.5792
16.384
24.576
512fs
0.005
PD Rev 4.1 July 2005
33.8688
24.576
36.864
768fs
0.006
WM8766
MID
13