WM8608 ETC-unknow, WM8608 Datasheet - Page 42

• Manufacturer Part Number: WM8608
• Description: The Wm8608 Comprises A High Performance Multi-channel Pwm Digital Power Amplifier Controller. Simply By Adding Appropriate Power Output Stages A Multi-channel Power Amplifier May Be Built. Six Identical Full Audio Bandwidth Channels, Plus A Reduced B
• Manufacturer: ETC-unknow

WM8608
Table 43 Digital Filter 1 Characteristics
Table 44 Subwoofer Filter Characteristic
PCM TO PWM CONVERTER
w
PARAMETER
Filter
Passband
Stopband
Passband ripple
Stopband Attenuation
Group Delay
PARAMETER
Sample Rate
32k
44k1
48k
88k2
96k
176k
192k
FILTER TYPE 1
The subwoofer filter characteristic is defined in Table 44
FILTER TYPE SUBWOOFER
Note: * indicates no interpolation filters
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.
Figure 23 PCM to PWM Converter
SYMBOL
SYMBOL
TEST CONDITIONS
TEST CONDITIONS
t
PWMP
t
OBCLK
-0.1dB
MIN
-60
2.0
2.7
3.0
6.1
6.8
t
6
*
*
PWMM
0.723
t
-3dB
10.7
14.5
15.8
32.1
34.9
TYP
PWMP
*
*
PP Rev 1.5 March 2004
0.242
UNIT
MAX
kHz
kHz
kHz
kHz
kHz
kHz
kHz
0.05
Product Preview
samples
UNIT
dB
dB
f
f
t
s
s
PWMM
42