WM8753 Wolfson Microelectronics plc, WM8753 Datasheet - Page 40

• Manufacturer Part Number: WM8753
• Description: HI FI AND TELEPHONY DUAL CODEC
• Manufacturer: Wolfson Microelectronics plc

Advanced Information
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Table 30 Analogue Input to Output Mixer Bypass Signal Selection (same as Table 4)
OUTPUT MIXERS
The WM8753L provides the option to mix the Hi-FI DAC output signals and Voice DAC output signal
with analogue line-in signals from the bypass and sidetone paths. The level of the mixed-in signals
can be controlled with PGAs (Programmable Gain Amplifiers). The Mono mixer has a gain of -6dB to
allow two signals with input amplitude of 0dB to be mixed together without clipping. This may be
compensated for using the output PGAs if required.
Table 31 Analogue input to output Mixers Sidetone Signal Selection
R47 (2Fh)
Input Control (1)
R48 (30h)
Input Control (2)
REGISTER
REGISTER
ADDRESS
ADDRESS
[7:6]
[5:4]
[4:3]
BIT
3
2
1
0
BIT
2
1
0
RXMSEL[1:0]
MICMUX[1:0]
LINEALC
MIC2ALC
MIC1ALC
RXALC
LMSEL[1:0]
MM
RM
LM
LABEL
LABEL
00
0
0
0
00
00
0
0
0
0
DEFAULT
DEFAULT
Line Mix Select:
00: LINE1 + LINE2
01: LINE1 – LINE2
10: LINE1 (LINE2 disconnected)
11: LINE2 (LINE1 disconnected)
Mono Mux Select
0 : Line Mix Output
1: Rx Mix output ( RXP +/– RXN )
Right Mux Select
0 : LINE2
1 : Rx Mix output ( RXP +/– RXN )
Left Mux Select
0 : LINE1
1 : Rx Mix output ( RXP +/– RXN )
00: RXP – RXN
01: RXP + RXN
10: RXP (RXN disconnected)
11: RXN (RXP disconnected)
Mic Mux Sidetone Select
00 : Sidetone = Left PGA output
01 : Sidetone = Mic1 preamp output
10 : Sidetone = Mic 2 preamp output
11 : Sidetone = Right PGA output
0 : Line Mix not selected into ALC Mix
1 : Line Mix selected into ALC Mix
0 : MIC2 not selected into ALC Mix
1 : MIC2 selected into ALC Mix
0 : MIC1 not selected into ALC Mix
1 : MIC1 selected into ALC Mix
ALC Mix input select RX
0 : RX not selected into ALC Mix
1 : RX selected into ALC Mix
Differential input, Rx, mixer
ALC Mix input select Line Mix
ALC Mix input select MIC2
ALC Mix input select MIC1
DESCRIPTION
DESCRIPTION
AI Rev 3.1 June 2004
WM8753L
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