WM8941GEFL/RV Wolfson Microelectronics, WM8941GEFL/RV Datasheet - Page 47

• Manufacturer Part Number: WM8941GEFL/RV
• Description: Audio CODECs Mono CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8941GEFL/RV

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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ANALOGUE OUTPUTS
Table 33 DAC Digital Limiter Control
SPKOUTP/SPKOUTN OUTPUTS
Table 34 Speaker Mixer Control
The WM8941 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.
The SPKOUT pins can drive a single bridge tied 8Ω speaker or two headphone loads of 16Ω or 32Ω
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.
R50
Speaker mixer
control
R54
Bypass path
attenuation
control
REGISTER
ADDRESS
REGISTER
ADDRESS
3:0
BIT
5
1
0
8
BIT
LIMBOOST
AUX2SPK
BYP2SPK
DAC2SPK
SPKATTN
LABEL
LABEL
0000
DEFAULT
DEFAULT
0
0
0
0
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
Output of auxiliary amplifier to speaker
mixer input
0 = not selected
1 = selected
Bypass path (output of input boost
stage) to speaker mixer input
0 = not selected
1 = selected
Output of DAC to speaker mixer input
0 = not selected
1 = selected
Attenuation control for bypass path
(output of input boost stage) to speaker
mixer input
0 = 0dB
1 = -10dB
PP, Rev 3.3, December 2007
DESCRIPTION
DESCRIPTION
WM8941
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