WM8581 datasheet(55/100 Pages) WOLFSON

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Production Data

WM8581

PD Rev 4.0 April 2007

OSC

CLK

(MHz)

PRE-

SCALE

(MHz)

PLLx_N

(Hex)

PLLx_K

(Hex)

FREQ

MODE_x

[1:0]

POST-

SCALE_x

PLLxCLK

(MHz)

98.304

8.192

C49BA

24.576

98.304

8.192

C49BA

24.576

98.304

8.192

C49BA

12.288

98.304

8.192

C49BA

12.288

98.304

8.192

C49BA

6.144

98.304

8.192

C49BA

8.192

98.304

8.192

C49BA

4.096

90.3168

7.5264

21B089

22.5792

90.3168

7.5264

21B089

22.5792

90.3168

7.5264

21B089

11.2896

90.3168

7.5264

21B089

11.2896

90.3168

7.5264

21B089

5.6448

90.3168

7.5264

21B089

7.5264

90.3168

7.5264

21B089

3.7632

13.5

98.304

7.2818

1208A5

24.576

13.5

98.304

7.2818

1208A5

12.288

13.5

90.3168

6.6901

2C2B24

22.5792

13.5

90.3168

6.6901

2C2B24

11.2896

Table 46 User Mode PLL Configuration Examples

When considering settings not shown in this table, the key configuration parameters which must be selected

for optimum operation are:

•

90MHz ≤ f2 ≤ 100MHz

•

5 ≤ PLLx_N ≤ 13

•

OSCCLOCK = 10 to 14.4MHz or 16.28 to 27MHz

CLOCK OUTPUT (CLKOUT) AND MCLK OUTPUT (MCLK)

The clock output (CLKOUT) pin can be used as a clock output. This pin is intended to be used as a

clock source pin for providing the central clock reference for an audio system.

The CLKOUT clock source can be selected from OSCCLK, PLLACLK or PLLBCLK. The control bits

for the CLKOUT signal are shown in Table 47.

The MCLK pin can be configured as an input or output – the WM8581 should be powered down when

switching MCLK between an input and an output. As an output, MCLK can be sourced from

OSCCLK, PLLACLK or PLLBCLK.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

6:5

MCLKOUTSRC

MCLK pin output source

00 = Input – Source MCLK pin

01 = Output – Source PLLACLK

10 = Output – Source PLLBCLK

11 = Output – Source OSCCLK

PLLB 4

07h

8:7

CLKOUTSRC

CLKOUT pin source

00 = No Output (tristate)

01 = Output – Source PLLACLK

10 = Output – Source PLLBCLK

11 = Output – Source OSCCLK

Table 47 MCLK and CLKOUT Control

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