WM8985GEFLSLASHR datasheet(67/118 Pages) WOLFSON

67 / 118 page

Pre-Production

WM8985

PP, Rev 3.4, October 2006

CLASS D / CLASS AB HEADPHONE OUTPUTS (LOUT2 AND ROUT2)

The outputs LOUT2 and ROUT2 are designed to drive two headphone loads of 16

Ω or 32Ω or line

outputs (See Headphone Output and Line Output sections, respectively). Each output has an

individual volume control PGA, a mute and an enable control bit as shown in Figure 27. LOUT2 and

ROUT2 output the left and right channel mixer outputs respectively.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R7 (07h)

7:4

DCLKDIV

1000

Controls clock division from

SYSCLK to generate suitable class

D clock.

Recommended class D clock

frequency = 1.4MHz.

0000 = divide by 1

0010 = divide by 2

0011 = divide by 3

0100 = divide by 4

0101 = divide by 5.5

0110 = divide by 6

1000 = divide by 8

1001 = divide by 12

1010 = divide by 16

R23 (17h)

CLASSDEN

Enable signal for class D mode on

LOUT2 and ROUT2

0 = Class AB mode

1 = Class D mode

Table 35 Class D Control Registers

When driving headphones using class D outputs it is necessary to use appropriate filtering, placed

close to the device, to minimise EMI emissions from the headphone cable (Refer to "Applications

Information" for more information). This filtering does not prevent class AB mode operation.

Figure 27 LOUT2 and ROUT2 Class D Headphone Configuration

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