MC13783VK Datasheet, PDF (32/50 Pages) Freescale Semiconductor, Inc – Power Management and Audio Circuit

Functional Description
4.3.5 Audio Output Section
4.3.5.1 Audio Signal Routing
Figure 9 on page 32 shows a block diagram of the audio output section is given indicating the routing
possibilities.
From Tx
Voice Codec
DAC
CDCBYP
PGArx
PGARXEN
PGARX[3:0]
Stereo DAC
Right
Channel
DAC
Left
Channel
DAC
To Tx
RXINR
Arxin
PGAst
PGAst
PGASTEN
PGAST[3:0]
PGArxin
Mixer, Adder, Balance
ADDCDCIN
ADDSTIN
ADDRXIN
Mono
Adder
Balance
MONO[1:0]
BALLR
BAL[2:0]
RXINL
Arxin
ARXINEN
ARXIN
PGArxin
ARXINEN
PGARXIN[3:0]
Selector
Codec
CDCOUTEN
Codec
Right
ASPSEL
ALSPSEL
Codec
ASPEN
ALSPEN
Right
Left
Left
LSPLEN
Codec
Right
AHSSEL
Codec
Left
CDCOUT
Asp
ASPEN
SPP
SPM
VINLSP
Alsp
ALSPEN
LSPP
LSPM
GNDLSP
LSPL
AhsR
AHSREN
AhsL
AHSLEN
Detect
HS R
HSDET
Phantom ^HSPGF
Ground HSPGS
Detect
HSL
HSLDET
Codec
Right
ARXOUTSEL
Codec
Left
ArxoutR ^RXOUTR
ARXOUTREN
RXOUTL
ArxoutL
To USB
ARXOUTLEN
Figure 9. Audio Output Section Diagram
Four signal sources can be used in the receive path. The voice CODEC receive signal, the voice CODEC
transmit signal (for test purposes), the stereo DAC and an external stereo source like an FM radio. The
latter can also be routed to the voice CODEC ADC section for recording purposes. Each of the input source
signals is amplified via an independently programmable gain amplifier. The amplified signals are fed into
a mixer where the different signals can be mixed. The mixed signal goes through a mono adder and balance
circuit which can create a mono signal out of the stereo input signals, and allows for balance control. Via
the selector, the composite signal is then directed to one or more of the outputs. These are the regular phone
earpiece (Asp), the loudspeaker for hands free or ringing (Alsp), the stereo headset (Ahsr, Ahsl) and the
stereo line out. The voice CODEC output signal can also follow an independent route to all of the
amplifiers via the additional selector inputs. In addition to the amplifiers, low power outputs are available
at LSPL and CDCOUT.
MC13783 Technical Data, Rev. 3.5
32
Freescale Semiconductor