WM1811A datasheet(110/328 Pages) WOLFSON

110 / 328 page

WM1811A

Production Data

PD, November 2013, Rev 4.1

110

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

5:0

MIXOUTR_VOL[5:0]

39h

(0dB)

MIXOUTRVOL (Right Mixer Output

PGA) Volume

-57dB to +6dB in 1dB steps

00_0000 = -57dB

00_0001 = -56dB

… (1dB steps)

11_1111 = +6dB

(See Table 64 for output PGA

volume control range)

Table 61 Mixer Output PGA (MIXOUTLVOL, MIXOUTRVOL) Control

The headphone output PGA controls are shown inTable 62.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 toeither HPOUT1_VU bit. This

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

The HPOUT1_ATTN register controls a -3dB attenuation function in the HPOUT1L and HPOUT1R

signal paths. (Note that this single register applies to the Left and Right output paths.) The output path

Signal to Noise Ratio (SNR) may be improved when the HPOUT1_ATTN bit is set, but the maximum

signal level is reduced by 3dB.

Note

that,

when

the

HPOUT1_ATTN

updated

Control mode

(CP_DYN_PWR=0), the HPOUT1_ATTN function is not fully implemented until a ‘1’ has been written

to HPOUT1_VU. See “Charge Pump” for details of the CP_DYN_PWR register bit.

The DAC1L_TO_HPOUT1L and DAC1R_TO_HPOUT1R register bits allow the DACL and DACR

outputs to be selected as the single input to the HPOUT1L and HPOUT1R headphone output PGAs

respectively. When these bits are asserted, the respective output mixer settings are ignored, and only

the DAC path(s) are enabled. Note that these register controls are provided for software compatibility

with WM8994; it is not recommended to use these register bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R28 (001Ch)

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_

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

00_0000 = -57dB

00_0001 = -56dB

… (1dB steps)

11_1111 = +6dB

(See Table 64 for output PGA

volume control range)

WM1811A Datasheet(PDF) 110 Page - Wolfson Microelectronics plc

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