V23826-K305-C63/C363, DC/DC Multimode 850 nm 1.3 Gigabit Ethernet 1x9 Trx
2
Semiconductor Group
This transceiver operates at 1.3 Gbits per second from a single
power supply (+5 V or +3.3 V). The full differential data inputs
and outputs are PECL compatible.
Functional Description of 1x9 Pin Row Transceiver
This transceiver is designed to transmit serial data via multimode
cable.
Functional Diagram
The receiver component converts the optical serial data into PECL
compatible electrical data (RD and RDnot). The Signal Detect (SD,
active high) shows whether an optical signal is present.
The transmitter converts PECL compatible electrical serial data
(TD and TDnot) into optical serial data.
The transmitter contains a laser driver circuit that drives the
modulation and bias current of the laser diode. The currents are
controlled by a power control circuit to guarantee constant output
power of the laser over temperature and aging. The power con-
trol uses the output of the monitor PIN diode (mechanically built
into the laser coupling unit) as a controlling signal, to prevent the
laser power from exceeding the operating limits.
Single fault condition is ensured by means of an integrated auto-
matic shutdown circuit that disables the laser when it detects
transmitter failures. A reset is only possible by turning the power
off, and then on again.
The transceiver contains a supervisory circuit to control the
power supply. This circuit makes an internal reset signal whene-
ver the supply voltage drops below the reset threshold. It keeps
the reset signal active for at least 140 milliseconds after the
voltage has risen above the reset threshold. During this time the
laser is inactive.
An ISM-Shut-Down (Input Signal Monitor) disables laser if a con-
stant logic low is present at the input.
Laser
Driver
Power
Control
Receiver
o/e
o/e
Laser
e/o
RX Coupling Unit
TD
TD
RD
RD
SD
Laser Coupling Unit
Multimode Fiber
LEN
Monitor
Signal Monitor and
Automatic Shut-Down
TECHNICAL DATA
The electro-optical characteristics described in the follow-
ing tables are valid only for use under the recommended
operating conditions.
Recommended Operating Conditions
Notes
1. For VCC–VEE (min., max.). 50% duty cycle. The supply current does
not include the load drive current of the receiver output. Add max.
45 mA for the three outputs. Load is 50 Ω to VCC–2 V.
2. Data inputs are DC coupled.
Transmitter Electro-Optical Characteristics
Notes
1. Into multimode fiber, 62.5 µm or 50 µm diameter.
2. Laser power is shut down if power supply is below VTH and swit-
ched on if power supply is above VTH after tRES.
Parameter Symbol Min. Typ. Max. Units
Case Temperature TC070°C
Power Supply
Voltage
K305-C63 VCC–
VEE
4.75 5.0 5.25 V
K305-C363 3.1 3.3 3.5
Supply
Current(1)
K305-C63 ICC Tbd Tbd mA
K305-C363 Tbd Tbd
Transmitter
Data Input Low Voltage(2) VIL–VCC -1950 -1475 mV
Data Input High Voltage VIH–VCC -1100 -720
Receiver
Input Center Wavelength λC770 860 nm
Transmitter Symbol Min. Typ. Max. Units
Launched Power
(Average)(1)
PO–9.5 –4 dBm
Center Wavelength λC830 850 860 nm
Spectral Width (RMS) σλ0.85
Relative Intensity Noise RIN –117 dB/Hz
Extinction Ratio (Dynamic) ER 9 dB
Reset Threshold(2) VTH 2.9 V
Reset Time Out(2) tRES 140 240 560 ms
Rise/Fall Time, 20%–80% tR, tF0.26 ns
Coupled Power Ratio CPR 9dB