Dell 2145cn Información técnica Pagina 37

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Product spec and feature
2-26
18) FAX section
ଝG
Block Diagram
Implemented by based on the silicon DAA (Data Access Arrangement) Solution, and is roughly composed
of two Chip Solution
• SI2435(SSD) A Modem Chip which embeds SSD (System Side Device) for interfacing between
LSD and Voice Codec(SI3000)
• SI3018 (LSD) A LIU (Line Interface Unit) Chip which is controlled by SSD and satisfies each PSTN
Requirements by modulating internal Configuration with connecting Tel Line.
Isolation
Interface
Hybrid and
dc
Termination
Ring
Detect
Off-Hook
RX
IB
SC
DCT
VREG
VREG2
DCT2
DCT3
RNG1
RNG2
QB
QE
QE2
Si3018
Si2435
DAA
Interface
Microcontroller
DSP
PLL
Clocking
RAM/ROM
External
Circuitry
Isolation
Barrier
CLKOUT
RXD
Codec
Interface
4.9152
XTALO
CLKI /XTALI
SDI SDO
nFSYNC
TXD
nCTS
nRTS
nDCD
ESC
nRI
nINT
Voic Codec
Si3000
MCLK nFSYNCSDI SDO
nRESET
nRESET
MBIAS
MIC
HANDSET
4pin Connector
Main Board Interface
20pin Connector
GND
3.3V
Tel
Line
Ext.
Line
5V
CML
BLOCK DIAGRAM
MC34119
AOUT
SPK_CTL
KEYCLICK
VOL_0~VOL_2
SPK_OUT
SPKER
Serial
Interface
5V
CML
5V
SPKRR
SPKRL
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