ACS103 Semtech Corporation, ACS103 Datasheet
ACS103
Manufacturer Part Number
ACS103
Description
Acapella Optical Modem ic
Manufacturer
Semtech Corporation
Datasheet
1.ACS103.pdf
(10 pages)
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ACS103 - 3 Channel, Synchronous or Asynchronous Single Fiber Modem
Acapella Optical Modem IC
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
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.
TxCL
RxD1
RxD2
RxD3
RxCL
TxD1
TxD2
TxD3
GND
VA+
VD+
-9
.
DCDB RTS CTS DTR DSR XI3 XO3 RSS
3 Channel, Synchronous or Asynchronous Single Fiber Modem
XI1 XO1 XI2 XO2
RS-232 Interface
Digital
Digital
Filter
Filter
Block diagram of ACS103
Decompress
Compress
FIFO
FIFO
1
Decoder
Encoder
General Description:
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.
'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.
Inter-IC Encoding Technique
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.
3B4B
3B4B
DR
(1:4)
4
DM
Control Logic
3
(1:3)
LED Receiver
LED Driver
CKC SEL
LDP
LDN
ACS103
ACS103 Issue 2.03 May 1996.
GND
PPLED
TRC
CNT
XTAL
In
2
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