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ACS103 Datasheet

  • ACS103

  • Acapella Optical Modem IC

  • 10頁

  • SEMTECH   SEMTECH

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ACS103 - 3 Channel, Synchronous or Asynchronous Single Fiber Modem
Acapella Optical Modem IC
3 Channel, Synchronous or Asynchronous Single Fiber Modem
Main Features:
*
Enables three full-duplex serial transmission
channels through a single fiber optic cable,
providing a virtual six fiber path.
Link lengths up to 5 km.
Uses a single Ping Pong LED (PPLED) to both
transmit and receive data.
Supports 7 synchronous data rates up to 64 kbps
or asynchronous data rates from DC to 19.2/
9.6 kbps.
Supports three additional low frequency
asynchronous channels or RS-232 handshake
signals: RTS, CTS, DTR and DSR.
BER 10
-9
.
Inter-IC Encoding Technique
*
Digital mode, allowing the user to add an
external amplifier. Also enables the ACS103 be
used in non-fiber applications e.g. IR/RF.
ACS101 emulation mode giving 100 %
compatibility with the ACS101.
General Description:
ACS103
*
*
The ACS103 is a complete synchronous optical-
modem controller/driver IC, supporting various
user-programmable, full-duplex data-rates to
256 kbps over a single fiber. Alternatively, up to 3
channels of 64 kbps each can be carried. In
'Standard' mode, the fiber may be up to 2.5 km long,
or up to 5 km in 'Double' mode.
Communicating optical-modems automatically
maintain synchronisation with each other such that
the receive phase of one modem is lined-up with the
transmit phase of the other, compensating for the
propagation delay presented by the link. Link lengths
from zero to maximum distance are catered for
automatically.
The ACS103 incorporates ACS101 functionality, with
additional logic to support 3 channels.
*
2
*
*
*
The 3B4B encoding method is used for
communication between ACS103s, thus ensuring
that there is no DC component in the signal. The
encoding and decoding is transparent to the user.
Block diagram of ACS103
TxD1
TxD2
TxD3
TxCL
TRC
Digital
Filter
FIFO
Compress
3B4B
Encoder
LDP
PPLED
LED Driver
LED Receiver
RxD1
RxD2
RxD3
RxCL
LDN
Digital
Filter
FIFO
Decompress
3B4B
Decoder
GND
CNT
VA+
RS-232 Interface
VD+
GND
4
Control Logic
XTAL
3
DCDB RTS CTS DTR DSR XI3 XO3 RSS
XI1 XO1 XI2 XO2
DR
(1:4)
DM
(1:3)
CKC
SEL
1
ACS103 Issue 2.03 May 1996.

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