WM8608 datasheet(42/54 Pages) WOLFSON

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WM8608

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PP Rev 1.5 March 2004

FILTER TYPE 1

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Filter

Passband

0.242

Stopband

0.723

Passband ripple

±0.05

Stopband Attenuation

-60

Group Delay

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.

PWMP

PWMM

OBCLK

Figure 23 PCM to PWM Converter

WM8608 데이터시트(PDF) 42 Page - Wolfson Microelectronics plc

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