WM8728
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INFINITE ZERO DETECTION
Setting the IZD register bit determines whether the device is automuted when a sequence of more
than 1024 ZEROS is detected.
REGISTER ADDRESS
0011
BIT
LABEL
DEFAULT
DESCRIPTION
8
IZD
0
Infinite ZERO detection circuit
control and automute control
Interface Control
0: Infinite ZERO detect disabled
1: Infinite ZERO detect enabled
Table 20 IZD Control
DIGITAL FILTER CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITIONS
-3dB
MIN
TYP
MAX
UNIT
Passband Edge
Passband Ripple
Stopband Attenuation
0.487fs
f < 0.444fs
f > 0.555fs
±0.05
dB
dB
-60
Table 21 Digital Filter Characteristics
DAC FILTER RESPONSES
0.2
0.15
0.1
0
-20
-40
0.05
0
-60
-0.05
-0.1
-0.15
-0.2
-80
-100
-120
0
0.5
1
1.5
2
2.5
3
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Frequency (Fs)
Frequency (Fs)
Figure 16 DAC Digital Filter Frequency Response
-44.1, 48 and 96kHz
Figure 17 DAC Digital Filter Ripple
-44.1, 48 and 96kHz
0.2
0
-20
-40
-60
-80
0
-0.2
-0.4
-0.6
-0.8
-1
0
0.2
0.4
0.6
0.8
1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Frequency (Fs)
Frequency (Fs)
Figure 18 DAC Digital Filter Frequency Response
-192kHz
Figure 19 DAC Digital Filter Ripple
-192kHz
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
22
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
