WM8711SEDSSLASHR datasheet(40/47 Pages) WOLFSON

40 / 47 page

Production Data

WM8711 / WM8711L

PD Rev 4.3 September 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

USB/

NORMAL

Mode Select

1 = USB mode (250/272fs)

0 = Normal mode (256/384fs)

BOSR

Base Over-Sampling Rate

USB Mode

0 = 250fs

1 = 272fs

5:2

SR[3:0]

0000

DAC sample rate

control;

See USB Mode

and Normal

Mode Sample

Rate sections for

operation

Normal Mode

0 = 256fs

1 = 384fs

CLKIDIV2

Core Clock divider select

1 = Core Clock is MCLK divide by 2

0 = Core Clock is MCLK

0001000

Sampling

Control

CLKODIV2

CLKOUT divider select

1 = CLOCKOUT is MCLK divide by 2

0 = CLOCKOUT is MCLK

0001001

Active Control

ACTIVE

Activate Interface

1 = Active

0 = Inactive

0001111

Reset Register

8:0

RESET

not reset

Reset Register

Writing 00000000 to register resets

device

Table 24 Register Map Description

Note:

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

otherwise.

DIGITAL FILTER CHARACTERISTICS

The DAC employ 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

TYP

MAX

UNIT

DAC Filter Type 0 (USB mode, 250fs operation)

+/- 0.03dB

0.416fs

Passband

-6dB

0.5fs

Passband Ripple

+/-0.03

Stopband

0.584fs

Stopband Attenuation

f > 0.584fs

-50

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

+/- 0.03dB

0.4535fs

Passband

-6dB

0.5fs

Passband Ripple

+/- 0.03

Stopband

0.5465fs

Stopband Attenuation

f > 0.5465fs

-50

Table 25 Digital Filter Characteristics

WM8711SEDS/R 数据表(PDF) 40 Page - Wolfson Microelectronics plc

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