WM8960GEFLSLASHV datasheet(39/88 Pages) WOLFSON

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Preliminary Technical Data

WM8960

PTD, September 2006, Rev 2.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

ACGAIN

[2:0]

000

(1.0x)

AC Speaker Boost (Boosts speaker AC

output signal by up to 1.8 x on left and

right channels)

000 = 1.00x boost (+0dB)

001 = 1.27x boost (+2.1dB)

010 = 1.40x boost (+2.9dB)

011 = 1.52x boost (+3.6dB)

100 = 1.67x boost (+4.5dB)

101 = 1.8x boost (+5.1dB)

110 to 111 = Reserved

Table 25 SPK_L/SPK_R Volume and Speaker Boost Control

To prevent pop noise, DCGAIN and ACGAIN should not be modified while the speaker outputs are

enabled.

To avoid clipping at speaker ground, ACGAIN should not be greater than DCGAIN.

To avoid clipping at speaker supply, SPKVDD1 and SPKVDD2 must be high enough to support the

peak output voltage when using DCGAIN and ACGAIN functions. The peak output voltage is

AVDD*(DCGAIN+ACGAIN)/2.

DCGAIN should normally be set to the same value as ACGAIN.

See "Volume Updates" for more information on volume update bits, zero cross and timeout

operation.

See "Class D Speaker Outputs" for more information on class D speaker operation.

OUT3 OUTPUT

The OUT3 pin can drive a 16

Ω or 32Ω headphone or a line output or be used as a pseudo-ground for

capless headphone drive (see Headphone Output section). It can also drive out a mono mix of left

and right output mixers (See Output Signal Path).

WM8960GEFL/V Datasheet(PDF) 39 Page - Wolfson Microelectronics plc