WM8961GEFLSLASHV datasheet(43/116 Pages) WOLFSON

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WM8961

Pre-Production

PP, August 2009, Rev 3.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R2 (02h)

LOUT1

Volume

OUT1VU

Headphone Volume Update

0 = Store LOUT1VOL in intermediate

latch (no gain change)

1 = Update left and right channel gains

(left = LOUT1VOL, right = intermediate

latch)

LO1ZC

Left zero cross enable

0 = Change gain immediately

1 = Change gain on zero cross only

6:0

LOUT1VOL

[6:0]

0000000

(MUTE)

LOUT1 Volume

1111111 = +6dB

… 1dB steps down to

0110000 = -73dB

0101111 to 0000000 = Analogue

MUTE

R3 (03h)

ROUT1

Volume

OUT1VU

Headphone Volume Update

0 = Store ROUT1VOL in intermediate

latch (no gain change)

1 = Update left and right channel gains

(left = intermediate latch, right =

ROUT1VOL)

RO1ZC

Right zero cross enable

0 = Change gain immediately

1 = Change gain on zero cross only

6:0

ROUT1VOL

[6:0]

0000000

(MUTE)

ROUT1 Volume

Similar to LOUT1VOL

R26 (1Ah)

Power

Management

(2)

LOUT1_PGA

LOUT1 left headphone PGA Output

Enable

ROUT1_PGA

ROUT1 right headphone PGA Output

Enable

Table 28 Headphone Output PGA Volume Control

See "Volume Updates" section for a description of the volume update function, the zero cross function

and the timeout operation.

HEADPHONE OUTPUT DRIVE STAGE

The headphone output drive stage is a stereo differential to single-ended amplifier. It is capable of

driving 16

Ω or 32Ω headphones without the need for large AC coupling capacitors, which is achieved

by having separate positive and negative supplies, generated by a charge pump, detailed in the

“Charge Pump” section. It also permits power up and power down with minimised ‘pop’ operation

through the use of a DC Servo to null out any offset on the outputs.

A secondary volume PGA in the output drive stage permits an improvement in SNR for applications

that limit the maximum output voltage. This PGA can be set to attenuate by up to 7dB, as detailed in

Table 29.

Because the secondary volume PGA controlled by HPL_VOL[2:0] and HPR_VOL[2:0] does not have

a Zero Cross functionality, it is designed to be adjusted only during initialisation or periods of silence.

For volume adjustments with a signal playing, it is recommended to use LOUT1VOL and ROUT1VOL.

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