WM8993 datasheet(77/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

The headphone output PGA is configurable between two input sources. The default input to each

headphone output PGA is the respective output mixer (MIXOUTL or MIXOUTR). A direct path from

the DACL or DACR can be selected using the DACL_TO_HPOUT1L and DACR_TO_HPOUT1R

using the output mixers; this offers reduced power consumption by allowing the output mixers to be

disabled in this typical usage case.

The headphone output PGA controls are shown in Table 48. The HPOUT1_VU bits control the

loading of the headphone PGA volume data. When HPOUT1_VU is set to 0, the volume control data

will be loaded into the respective control register, but will not actually change the gain setting. The

headphone PGA volume settings are both updated when a 1 is written to either HPOUT1_VU bit.

This makes it possible to update the gain of both output paths simultaneously.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R28 (1Ch)

Left Output

Volume

HPOUT1_VU

N/A

Headphone Output PGA Volume

Update

Writing a 1 to this bit will update

HPOUT1LVOL and HPOUT1RVOL

volumes simultaneously.

HPOUT1L_ZC

HPOUT1LVOL (Left Headphone

Output PGA) Zero Cross Enable

0 = Zero cross disabled

1 = Zero cross enabled

HPOUT1L_MUTE_N

HPOUT1LVOL (Left Headphone

Output PGA) Mute

0 = Mute

1 = Un-mute

5:0

HPOUT1L_VOL [5:0]

2Dh

(-12dB)

HPOUT1LVOL (Left Headphone

Output PGA) Volume

-57dB to +6dB in 1dB steps

(See Table 50 for output PGA

volume control range)

R45 (2Dh)

Output

Mixer1

DACL_TO_HPOUT1L

HPOUT1LVOL (Left Headphone

Output PGA) Input Select

0 = MIXOUTL

1 = DACL

R29 (1Dh)

Right Output

Volume

HPOUT1_VU

N/A

Headphone Output PGA Volume

Update

Writing a 1 to this bit will update

HPOUT1LVOL and HPOUT1RVOL

volumes simultaneously.

HPOUT1R_ZC

HPOUT1RVOL (Right Headphone

Output PGA) Zero Cross Enable

0 = Zero cross disabled

1 = Zero cross enabled

HPOUT1R_MUTE_N

HPOUT1RVOL (Right Headphone

Output PGA) Mute

0 = Mute

1 = Un-mute

5:0

HPOUT1R_VOL [5:0]

2Dh

(-12dB)

HPOUT1RVOL (Right Headphone

Output PGA) Volume

-57dB to +6dB in 1dB steps

(See Table 50 for output PGA

volume control range)

R46 (2Eh)

Output

Mixer2

DACR_TO_HPOUT1

HPOUT1RVOL (Right Headphone

Output PGA) Input Select

0 = MIXOUTR

1 = DACR

Table 48 Headphone Output PGA (HPOUT1LVOL, HPOUT1RVOL) Control

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