Datasheet

Functional Description
MC13783 Technical Data, Rev. 3.5
32 Freescale Semiconductor
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.
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.
Asp
AhsR
AhsL
Phantom
Ground
SPP
LSPP
SPM
LSPM
HS
R
HSLDET
HSPGF
Detect
Detect
RXINL
VINLSP
GNDLSP
RXOUTL
HSPGS
LSPL
HSL
From Tx
RXINR
PGArxin
PGAst
Left
Channel
DAC
Right
Channel
DAC
Stereo DAC
PGArx
Voice Codec
DAC
Mono
Adder
Balance
RXOUT
R
Alsp
Mixer, Adder, Balance
CDCOUT
ArxoutL
ArxoutR
To USB
Codec
Right
Left
Codec
Codec
Codec
Codec
Codec
Right
Right
Left
Left
Left
CDCOUTEN
LSPLEN
ASPSEL
ALSPSEL
AHSSEL
ARXOUTSEL
ASPEN
ALSPEN
AHSLEN
AHSREN
ARXOUTLEN
ARXOUTREN
Selector
Arxin
Arxin
PGAst
PGArxin
A
SPE
N
ALSPEN
Codec
Right
PGASTE
N
PGAST[3:0]
ARXINEN
PGARXIN[3:0]
PGARXEN
PGARX[3:0]
ARXINEN
ARXIN
MONO[1:0
]
BALLR
BAL[2:0]
ADDCDCIN
ADDSTIN
ADDRXIN
CDCBYP
To Tx
HSDET