WM8753LEBSLASHV datasheet(40/87 Pages) WOLFSON

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WM8753L

AI Rev 3.1 June 2004

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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

[4:3]

LMSEL[1:0]

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 )

R47 (2Fh)

Input Control (1)

Left Mux Select

0 : LINE1

1 : Rx Mix output ( RXP +/– RXN )

Table 30 Analogue Input to Output Mixer Bypass Signal Selection (same as Table 4)

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

[7:6]

RXMSEL[1:0]

Differential input, Rx, mixer

00: RXP – RXN

01: RXP + RXN

10: RXP (RXN disconnected)

11: RXN (RXP disconnected)

[5:4]

MICMUX[1:0]

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

LINEALC

ALC Mix input select Line Mix

0 : Line Mix not selected into ALC Mix

1 : Line Mix selected into ALC Mix

MIC2ALC

ALC Mix input select MIC2

0 : MIC2 not selected into ALC Mix

1 : MIC2 selected into ALC Mix

MIC1ALC

ALC Mix input select MIC1

0 : MIC1 not selected into ALC Mix

1 : MIC1 selected into ALC Mix

R48 (30h)

Input Control (2)

RXALC

ALC Mix input select RX

0 : RX not selected into ALC Mix

1 : RX selected into ALC Mix

Table 31 Analogue input to output Mixers Sidetone Signal Selection

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