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WM8608 Datasheet(PDF) 42 Page - Wolfson Microelectronics plc

Part # WM8608
Description  5 TO 7.1 CHANNEL PWM CONTROLLER
PDF  54 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8608 Datasheet(HTML) 42 Page - Wolfson Microelectronics plc

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PP Rev 1.5 March 2004
42
FILTER TYPE 1
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Filter
Passband
0.242
fs
Stopband
0.723
fs
Passband ripple
±0.05
dB
Stopband Attenuation
-60
dB
Group Delay
6
samples
Table 43 Digital Filter 1 Characteristics
The subwoofer filter characteristic is defined in Table 44
FILTER TYPE SUBWOOFER
PARAMETER
SYMBOL
TEST CONDITIONS
-0.1dB
-3dB
UNIT
Sample Rate
32k
2.0
10.7
kHz
44k1
2.7
14.5
kHz
48k
3.0
15.8
kHz
88k2
6.1
32.1
kHz
96k
6.8
34.9
kHz
176k
*
*
kHz
192k
*
*
kHz
Table 44 Subwoofer Filter Characteristic
Note: * indicates no interpolation filters
PCM TO PWM CONVERTER
The PCM to PWM converter converters the Pulse-Code Modulated (PCM) signal into a highly linear
Pulse-Width Modulated (PWM) signal. Table 45 defines the Pulse Repetition Frequency, (PRF),
output clock rate (OBCLK) and minimum pulse width for each supported sampling frequency.
t
PWMP
t
PWMP
t
PWMM
t
PWMM
t
OBCLK
Figure 23 PCM to PWM Converter



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