WM8946ECSSLASHR datasheet(74/175 Pages) WOLFSON

Part #	WM8946ECS/R

Description	Stereo Low-Power CODEC with Video Buffer

PDF	175 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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74 / 175 page

WM8946

Production Data

PD, July 2012, Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

Companding

control

DAC_COMP

DAC Companding Enable

0 = Disabled

1 = Enabled

DAC_COMPMO

DAC Companding Mode

0 = µ-law

1 = A-law

ADC_COMP

ADC Companding Enable

0 = Disabled

1 = Enabled

ADC_COMPMO

ADC Companding Mode

0 = µ-law

1 = A-law

Table 47 Companding Control

Companding uses a piecewise linear approximation of the following equations (as set out by ITU-T

G.711 standard) for data compression:

-law (where =255 for the U.S. and Japan):

F(x) = ln( 1 +

|x|) / ln( 1 + )

} for -1 ≤ x ≤ 1

Table 1

law (where A=87.6 for Europe):

F(x) = A|x| / ( 1 + lnA)

 for x ≤ 1/A

F(x) = ( 1 + lnA|x|) / (1 + lnA)

 for 1/A ≤ x ≤ 1

u-law Companding

100

120

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Normalised Input

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Figure 29 µ-Law Companding

WM8946ECS/R Datasheet(PDF) 74 Page - Wolfson Microelectronics plc

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