WM9713 datasheet(52/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

1 (Mute)

Mute MONO

1: Mute (OFF)

0: No Mute (ON)

Right zero cross enable

0: Change gain immediately

1: Change gain only on zero crossings,

or after time-out

08h

MONO Vol

5:0

MONOVOL

000000

(0dB)

MONO Volume

000000: 0dB (maximum)

000001: -1.5dB

… (1.5dB steps)

011111: -46.5dB

1xxxxx: -46.5dB

Table 34 Mono PGA Control

SPEAKER OUTPUTS – SPKL AND SPKR

The SPKL and SPKR (pins 35 and 36) are designed to drive a loudspeaker load down to 8

Ω and can

also be used as line outputs and headphone outputs. They are designed to drive an 8

Ω load AC

coupled or in a BTL (capless) configuration. The available input sources are HPMIXL/R, SPKMIXL/R,

INV1/2 and Vmid (see Table 35).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

13:11

SPKL

000

(Vmid)

SPKL input source select

000: Vmid

001: no i/p (ZH if buffer disabled)

010: HPMIXL

011: SPKMIX

100: INV1

101-111: unused

1Ch

Output PGA

Mux Select

10:8

SPKR

000

(Vmid)

SPKR input source select

000: Vmid

001: no i/p (ZH if buffer disabled)

010: HPMIXR

011: SPKMIX

100: INV2

101-111: unused

Table 35 SPKL / SPKR PGA Input Source

The signal volume on SPKL and SPKR can be independently adjusted under software control by

writing to register 02h.

When not in use SPKL and SPKR can be powered down using the Powerdown register bits SPKL

and SPKR (register 3Eh, bits [8:7]). To minimise pops and clicks when the PGA is powered down /

up it is recommended that the Vmid input is selected during the power down / up cycle. This ensures

the same DC level is maintained on the output pin throughout.

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