ACS101A データシートの表示（PDF） - Semtech Corporation

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ACS101A

Acapella Optical Modem IC

Semtech Corporation 

Acapella Optical Modem IC

ACS101A Main Features:

* Full duplex serial transmission over one fiber.

* Link lengths up to 5km.

* Supports asynchronous data rates from DC to 76.8kbps.

* Supports synchronous data rates up to 512kbps.

* Full diagnostic modes - Remote and Local loopback.

* Uses a single Ping Pong LED (PPLED) to both receive and transmit

data for single fiber operation.

* Supports two additional low frequency asynchronous channels or

the RS-232 handshake signals.

* Digital mode for non fiber applications - RF.

* Bit Error Rate (BER) < 10-9

* Available in 44 pin PLCC package.

2

TRC

TxD

TxCL

RxD

RxCL

Digital

Filter

Data

Co mpress

FIFO Time

Co mpress

3B 4B

En co de r

Digital

Filter

Data

De com pr ess

FIFO Time

De com pr ess

3B 4B

Decoder

RS-232 Interface

Control Logic

LED

Driver

LED

Receiver

PPLED

DCDB CTS DSR RSS RTS DTR DR(3:1) DM(3:1)

CKC PORB

Equivalent Block Diagram of ACS101A

General Description:

The ACS101A is a complete controller, driver and receiver IC, supporting full-

duplex asynchronous transmission from DC to 76.8kbps and synchronous

data rates up to 512kbps over one optical fiber. The ACS101A also supports

two additional low frequency asynchronous channels or RS-232 handshake

signals, RTS, CTS, DTR and DSR.

The ACS101A 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.

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. In 'standard' mode, the fiber may be up to 2.5km

long, or up to 5km in 'double' mode.

1

ACS101A Issue 1.2 October 1999.

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