ACS102A Semtech Corporation, ACS102A Datasheet

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ACS102A

Manufacturer Part Number
ACS102A
Description
Acs102a Fiber Modem
Manufacturer
Semtech Corporation
Datasheet
Advanced Communications
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.
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TxD
RxD
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.
Ultra low power consumption, typically 2-3mA, which could be
extracted from the RS-232 port for self powered applications.
Uses a single Ping Pong LED or Laser Duplex Device for single fiber
applications, low cost LED/PIN or Laser/PIN combinations for twin
fiber applications.
Additional operating mode to support PIN with integrated TIA.
Supports 3 additional low frequency asynchronous channels or
the RS-232 handshake signals.
Digital and differential voltage input modes, plus modes for non
fiber applications - RF
Bit Error Rate (BER) < 10
Available in 44 pin TQFP (part no: ACS102A-TQ) and 44 pin
PLCC (part no: ACS102A-PL) packages.
ACS102A Fiber Modem
DCDB CTS
Digital
Digital
Filter
Filter
1
RS-232 Interface
DSR
Decompress
Compress
RIO
Equivalent Block Diagram of ACS102A
Data
Data
RTS
Description
DTR
Features
Decompress
FIFO Time
FIFO Time
Compress
RII
-9
DR(3:1) DM(3:1)
Encoder
Decoder
3B4B
3B4B
HD(2:1)
Control Logic
ACS102A Data Sheet
DP
HBT ERL
LED/Laser
LED/PIN
Receiver
TRC
Driver
PORB
PPLED
LDD
LED/PIN
Laser/PIN
combinations
2

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