XWM8739LEFL Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

Número de pieza

componentes Descripción

fabricante

XWM8739LEFL

Stereo Audio ADC

Wolfson Microelectronics plc 

WM8739 / WM8739L

Advanced Information

REGISTER

ADDRESS

0001001

Active Control

BIT

LABEL

0

ACTIVE

0001111

Reset Register

8:0 RESET

Table 20 Register Map Description

DEFAULT

DESCRIPTION

0

not reset

Activate Interface

1 = Active

0 = Inactive

Reset Register

Write 000000000 to register triggers

reset

Note

1. All other bits not explicitly defined in the register table should be set to zero, unless specified

otherwise (see Powerdown section).

DIGITAL FILTER CHARACTERISTICS

The ADC employs different digital filters. There are 4 types of digital filter, called Type 0, 1, 2 and 3.

The performance of Types 0 and 1 is listed in the table below, the responses of all filters is shown in

the proceeding pages.

PARAMETER

TEST CONDITIONS

MIN

ADC Filter Type 0 (USB Mode, 250fs operation)

Passband

+/- 0.05dB

0

-6dB

Passband Ripple

Stopband

0.584fs

Stopband Attenuation

f > 0.584fs

-60

ADC Filter Type 1 (USB mode, 272fs or Normal mode operation)

Passband

+/- 0.05dB

0

-6dB

Passband Ripple

Stopband

0.5465fs

Stopband Attenuation

f > 0.5465fs

-60

High Pass Filter Corner

Frequency

-3dB

-0.5dB

-0.1dB

Table 21 Digital Filter Characteristics

TYP

0.5fs

MAX

0.416fs

+/- 0.05

0.5fs

0.4535fs

+/- 0.05

3.7

10.4

21.6

UNIT

dB

dB

dB

dB

Hz

TERMINOLOGY

1. Stop Band Attenuation (dB) - the degree to which the frequency spectrum is attenuated (outside audio band)

2. Pass-band Ripple – any variation of the frequency response in the pass-band region

AI Rev 2.2 September 2001

29

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