WM8940CGEFLSLASHV datasheet(45/88 Pages) CIRRUS

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WM8940

Rev 4.4

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

3:0

LIMBOOST

0000

Limiter volume boost (can be used as a

stand alone volume boost when

LIMEN=0):

0000 = 0dB

0001 = +1dB

0010 = +2dB

0011 = +3dB

0100 = +4dB

0101 = +5dB

0110 = +6dB

0111 = +7dB

1000 = +8dB

1001 = +9dB

1010 = +10dB

1011 = +11dB

1100 = +12dB

1101 to 1111 = reserved

Table 33 DAC Digital Limiter Control

ANALOGUE OUTPUTS

The WM8940 has a single MONO output and two outputs SPKOUTP and SPOUTN for driving a mono

BTL speaker. These analogue output stages are supplied from SPKVDD and are capable of driving

up to 1V rms signals.

SPKOUTP/SPKOUTN OUTPUTS

The SPKOUT pins can drive a single bridge tied 8

Ω speaker or two headphone loads of 16

 or 32

or a line output (see Headphone Output and Line Output sections, respectively). The signal to be

output on SKPKOUT comes from the Speaker Mixer circuit and can be any combination of the DAC

output, the Bypass path (output of the boost stage) and the AUX input. The SPKOUTP/N volume is

controlled by the SPKVOL register bits. Note that gains over 0dB may cause clipping if the signal is

large. The SPKMUTE register bit causes the speaker outputs to be muted (the output DC level is

driven out). The output pins remains at the same DC level (VMIDOP), so that no click noise is

produced when muting or un-muting.

The SPKOUTN pin always drives out an inverted version of the SPKOUTP signal.

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