WM9713 datasheet(49/111 Pages) WOLFSON

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Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

MONO MIXER

The mono mixer drives the MONO pin. The following signals can be mixed into MONO:

•

LINEL/R (controlled by register 0Ah, see “Audio Inputs”)

•

the output of the Record PGA (controlled by register 14h, see “Audio ADC”,

“Record Gain”)

•

the stereo DAC signal (controlled by register 0Ch, see “Audio DACs”)

•

the MIC signal (controlled by register 10h, see “Audio Inputs”)

•

PC_BEEP (controlled by register 16h, see “Audio Inputs”)

•

the VXDAC signal (controlled by register 18h, see “Audio DACs”)

•

the AUXDAC signal (controlled by register 12h, see “Auxiliary DAC”)

In a typical smartphone application, the MONO signal is a mix of the amplified microphone signal

(possibly with Automatic Gain Control) and (if enabled) an audio playback signal from the stereo

DAC or the auxiliary DAC.

Note that when selected the stereo input pairs LINEL/R and DACL/R are summed and attenuated by

-6dB so that 0dBFS signals on each channel sum to give a stereo mixed 0dBFS output.

When not in use the mono mixer can be powered down using the Powerdown register bit MX

(register 3Ch, bit 0).

MIXER OUTPUT INVERTERS

There are two general purpose mixer output inverters, INV1 and INV2. Each inverter can be selected

to drive HPMIXL, HPMIXR, SPKMIX, MONOMIX or { ( HPMIXL + HPMIXR ) / 2 }. The outputs of the

inverters can be used to generate complimentary signals (to drive BTL configured loads) and to

provide greater flexibility in output driver configurations. INV1 can be selected as the source for

SPKL, MONO and OUT3 and INV2 as the source for SPKR and OUT4.

The input source for each inverter is selected using INV1[2:0] and INV2[2:0] in register 1Eh (see

Table 30). When no input is selected the inverter is powered down.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

15:13

INV1

000 (OFF)

INV1 source select

000: ZH (OFF – no source selected)

001: MONOMIX

010: SPKMIX

011: HPMIXL

100: HPMIXR

101: HPMIXMONO

110: unused

111: Vmid

1Eh

12:10

INV2

000 (OFF)

INV2 source select

Same as INV1

Table 30 Mixer Inverter Source Select

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