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Semtech Corporation - ACS102A Fiber Modem

Numéro de référence ACS102A
Description ACS102A Fiber Modem
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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ACS102A fiche technique
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ACS102A Fiber ModemAdvanced Communications
ACS102A Data Sheet
Features
* Full duplex serial transmission over single/twin fiber.
* Link lengths up to 25km.
* Supports asynchronous data rates from DC to 162kbps.
* Full diagnostic modes - Remote and Local loopback.
A* Ultra low power consumption, typically 2-3mA, which could be
extracted from the RS-232 port for self powered applications.
2* Uses a single Ping Pong LED or Laser Duplex Device for single fiber
0applications, low cost LED/PIN or Laser/PIN combinations for twin
fiber applications.
1* Additional operating mode to support PIN with integrated TIA.
* Supports 3 additional low frequency asynchronous channels or
Sthe RS-232 handshake signals.
* Digital and differential voltage input modes, plus modes for non
Cfiber applications - RF
A 2* Bit Error Rate (BER) < 10-9
* Available in 44 pin TQFP (part no: ACS102A-TQ) and 44 pin
PLCC (part no: ACS102A-PL) packages.
TRC PPLED
LDD
LED/PIN
Laser/PIN
Digital
Data
FIFO Time
3B4B
combinations
TxD
Filter
Compress
Compress
Encoder
LED/Laser
Driver
RxD
Digital
Data
FIFO Time
3B4B
Filter
D ecom pr ess
D ecom pr ess
Decoder
LED/PIN
Receiver
RS-232 Interface
Control Logic
DCDB CTS DSR RIO RTS DTR RII
DR(3:1) DM(3:1) HD(2:1) DP HBT ERL PORB
Equivalent Block Diagram of ACS102A
Description
The ACS102A is a complete controller, driver and receiver IC, supporting full-
duplex asynchronous transmission from DC to 162kbps over a single serial link.
Although primarily designed for single optical fibre applications, any other simple
serial media may be used. The ACS102A is optimised for very low power
consumption, consuming only 2 - 3mA at RS-232 data rates including power
provided to the LED and 'heartbeat' monitor. In applications where the power is
extracted from the RS232 data lines, this leaves a generous amount of power left
for any power extraction and RS-232 level shifting circuitry.
The ACS102A employs data compression and time compression techniques,
affording high launch power in short bursts, leading to a low average power
consumption. The advantage of this approach is that high link budgets can be
achieved with inexpensive optical components.
For example, the recommended set-up for RS-232 applications (19.2kbps +
handshake signals) assumes that the LED is driven with a peak current of
approximately 15.4mA for 6 % of the time. The machine cycle is short enough to
facilitate power supply smoothing with a small external capacitor in the region of
100µF.
1

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