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ACS104A-TQ Datasheet

  • ACS104A-TQ

  • ACS104A Fiber Modem

  • 12頁(yè)

  • SEMTECH   SEMTECH

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100 SERIES
Advanced Communications
ACS104A Fiber Modem
ACS104A Data Sheet
Features
Low cost, single-chip solution for data powered RS-232 modems
using twin fiber-optic cables. Includes all analog/digital functions
except for power extraction circuitry and RS-232 level shifting.
Suitable for plastic or glass fiber, RF, infra-red over free air or
other media.
Uses low cost LED and PIN combination to transmit and receive
data.
Additional operating mode to support PIN with integrated TIA.
Asynchronous data rates from DC to 162kbps.
Very low power consumption; typically 2 - 3mA, which could be
extracted from the RS232 port itself, for > 12 dB link budget.
Supports 3 additional low frequency asynchronous channels or
the RS-232 handshake signals.
Bit Error Rate (BER) < 10
-9
*
*
*
*
*
*
*
*
*
Available in 44 pin TQFP (part no: ACS104A-TQ) and 28 pin
PLCC (part no: ACS104A-PL) packages.
A
DSR RIO
S
C
FIFO Time
Compress
FIFO Time
Decompress
0
1
3B4B
Encoder
A
4
TRC
2
LED/PIN
combinations
TxD
Digital
Filter
Data
Compress
LED
Driver
PIN
Receiver
RxD
Digital
Filter
Data
Decompress
3B4B
Decoder
RS-232 Interface
Control Logic
DCDB CTS
RTS
DTR RII
DR(2:1) DM(2:1)
HBT
PORB
Equivalent Block Diagram of ACS104A
ACS104A Revision 1.6 September 2000
Description
The ACS104A is a complete controller, driver and receiver IC, supporting full-
duplex asynchronous transmission from DC to 162kbps over a serial link.
Improved sensitivity and additional operating modes are offered over the
ACS104. Although primarily designed to be used with standard LED emitters and
PIN receivers and twin optical fibers, any other simple serial media may be used.
The ACS104A 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 ACS104A 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 100碌F.
1

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