TODX2960(F) Toshiba, TODX2960(F) Datasheet - Page 2

• Manufacturer Part Number: TODX2960(F)
• Description: TXRX FIBER OPTIC
• Manufacturer: Toshiba
• Series: -r

Specifications of TODX2960(F)

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TOSLINK
A photocoupler is a semiconductor that consists of a light-emitting device
and a light-receiving device molded in one package. It is used to provide
electrical isolation between input and output. In contrast, TOSLINK uses
separate light-emitting and light-receiving units that are connected
through a long optical cable.
Because an optical cable is used as a transmission line, it is possible to
transmit signals over long distances while providing a galvanic isolation
between the transmitting and receiving ends.
Thus, TOSLINK can be viewed, in a sense, as a long-distance
photocoupler.
In an electrical data transmission system, a line driver is used to drive
electrical signals through a long transmission line such as a twisted-pair
cable. At the other end, a line receiver compensates for signal decay by
amplifying the signals. A connector is required at each end of the cable.
By contrast, in a TOSLINK-based system, a transmitting module converts
electrical signals into optical signals, and a receiving module converts
optical signals back to electrical signals. An optical fiber cable is used as a
transmission line, and optical connectors link the transmitting and
receiving modules to the cable.
The TOSLINK transmitting module incorporates a light-emitting diode and
driver circuit. The TOSLINK receiving module incorporates a photodiode
and waveform reshaping circuit. The interface is either TTL or PECL for
both modules for easy connection with other peripheral ICs.
TOSLINK is a trademark of Toshiba Corp.
Comparison of TOSLINK devices and photocouplers
Electrical and optical transmission systems
External appearances of TOSLINK
TM
Optical Transmission Devices
2
TOSLINK™ is a family of data transmission devices that use
optical signals instead of electrical signals. Because TOSLINK
uses an optical fiber cable as a transmission line, it provides
the following benefits, compared to electrical transmission
using a twisted-pair or coaxial cable:
Electrical input
Electrical input
Comparison of a TOSLINK device and a photocoupler
Optical transmitting module
Input
signal
signal
(a) Data transmission using a twisted-pair cable
(b) Data transmission using an optical cable
Input
Transmitting
E/O converter
V
circuit
Transmitting
CC
Data transmission systems
driver
module
Line
V
LED
connector
Electrical
CC
connector
(a) Photocoupler
Optical cable
optical
Twisted-pair cable
(b) TOSLINK
Fiber-optic link
Optical cable
Photodiode
Optical receiving module
connector
connector
optical
Electrical
O/E converter
Receiving
receiver
module
Line
Receiving
circuit
V
Output
Electrical output
Electrical output
CC
signal
signal
V
Output
CC