Advanced Information

WM8740

WOLFSON MICROELECTRONICS LTD

AI Rev 1.7 July 2000

13

POLARITY OF LR INPUT CLOCK

The left channel data for a particular sample instant is always input first, then the right channel data.

LRP

(REG3, B1)

L

LR High – left channel

LR Low – right channel

H

LR Low – left channel

LR High – right channel

Table 12 Polarity of LR Input Clock

INDIVIDUAL OR COMMON ATTENUTATION CONTROL

ATC

(REG3, B2)

L

Individual control

H

Common control from Reg0

Table 13 Individual or Common Attenuation Control

DIGITAL FILTER ROLL-OFF SELECTION

SRO

(REG3, B3)

L

Sharp

H

Slow

Table 14 Digital Filter Roll-Off Selection

ANALOGUE OUTPUT POLARITY REVERSAL

REV

(REG3, B4)

L

Normal

H

Inverted

Table 15 Analogue Output Polarity Reversal

CLKO OUTPUT FREQUENCY

CKO

(REG3, B5)

L

XTI

H

XTI/2

Table 16 CLKO Output Frequency

DE-EMPHASIS SAMPLE RATE

SF1

(REG3, B7)

SF0

(REG3, B6)

SAMPLE RATE

0

0

No de-emphasis

0

1

48kHz

1

0

44.1kHz

1

1

32kHz

Table 17 De-Emphasis Sample Rate

INFINITE ZERO DETECT

IZD

(REG3, B8)

L

Zero detect mute off

H

Zero detect mute on

Table 18 Infinite Zero Detect