WM8948ECSSLASHR datasheet(46/189 Pages) WOLFSON

Teilenummer	WM8948ECS/R

Bauteilbeschribung	Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller

PDF	189 Pages

Scroll/Zoom	100%

Hersteller	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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46 / 189 page

WM8948

Production Data

PD, May 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

(seconds/6dB)

0000 = 186ms

0001 = 372ms

0010 = 743ms

0011 = 1.49s

0100 = 2.97s

0101 = 5.94s

0110 = 11.89s

0111 = 23.78s

1000 = 47.56s

1001-1111 = Reserved

Table 20 DRC Time Constants

Under the following conditions, it is possible to predict the attack times with an input sine wave:

•

Decay rate is set at least 8 times the attack rate.

•

Attack time * input frequency > 1

To estimate the attack time for 10%-90%:

•

Attack Time = Register Value * 2.24

For example, if DRC_ATK = 1.45ms/6dB, then the attack time for 10%-90% = 1.45ms * 2.24 =

3.25ms.

The decay time for 10%-90% can be estimated using the graph in Figure 19.

Figure 19 Decay Time for 10%-90% vs Register Value Decay Rate

The decay rate register value read from the horizontal axis and the decay time for 10%-90% read

from the vertical axis.

WM8948ECS/R Datenblatt(PDF) 46 Page - Wolfson Microelectronics plc