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STXB48FS4I000P1 Arkusz danych(PDF) 3 Page - OPLINK Communications Inc.

Numer części STXB48FS4I000P1
Szczegółowy opis  Transmitter
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Producent  OPLINK [OPLINK Communications Inc.]
Strona internetowa  http://www.oplink.com
Logo OPLINK - OPLINK Communications Inc.

STXB48FS4I000P1 Arkusz danych(HTML) 3 Page - OPLINK Communications Inc.

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Oplink Communications, Inc.
Application Notes
Interface Circuit
DIFFERENTIAL
DIRECT-COUPLED PECL
STX-48
7 / 18
50 ohm line
50 ohm line
50 ohm line
50 ohm line
0.01
VCC - 2 V
5 / 20
DATA+ / CLK+
DATA- / CLK-
6 / 19
STX-48
7 / 18
0.01
0.022
5 / 20
DATA+/
CLK+
6 / 19
0.022
DATA-/
CLK-
DIFFERENTIAL
AC-COUPLED
Control
Circuit
Bias
Circuit
200Ω
10Ω
PD
Imon
Ib
LD
3KΩ
3KΩ
FM+
BM+
VCC
VCC
VEE
VEE
FM -
BM -
3KΩ
3KΩ
T
DC
DATA
CLOCK
Monitor Circuit
Timing Diagram (Clocked Operation)
STX48 Series
R04.2008.04.30
3
When the DATA+ input is at logic HIGH and DATA- input is
at logic LOW, the LD is ON; and vice versa. The transmitter is
normally enabled (i.e. when the TX DISABLE control input is
not connected). When theTX DISABLE input voltage is higher
than V
CC - 2 V, the laser is disabled (less than -30dBm output
power) independent of the input data.
The transmitter incorporates an Average Power Control (APC)
loop to stabilize the transmitter average optical output power
against temperature variation. The APC loop always acts
to keep the transmitter average optical output power at a
constant value (when the transmitter is enabled). Therefore,
when the input data is all continuous“zeroes”or all continuous
“ones”, the transmitter optical output power is a constant level
equal to the nominal average optical output power (not at the
“OFF” level or at the “ON” level).
When the MODE SELECTOR input is left unconnected or at
logic “LOW” (V
EE to VEE + 1.5V), the transmitter is in clocked
operation mode. In this mode, the input clock resynchronizes
the incoming data to reduce timing jitter.The timing between
the DATA and CLOCK inputs is as shown below. When the
MODE SELECTOR input at logic “HIGH” (V
CC - 1.5V to VCC),
the transmitter is in non-clocked operation mode. In this
mode, the CLOCK inputs are not used and hence need not
be provided.
The transmitter has internal 50 ohm termination to V
TD (pin 6)
for DATA inputs & V
TC (pin 19) for CLOCK inputs. The DATA &
CLOCK interface can be either direct PECL/ECL coupling or via
AC coupling as shown below. The use of differential signals is
strongly recommended. In cases where only single-ended signal
is available, the unused DATA input pin should be biased to V
CC
- 1.29 V for direct PECL/ ECL coupling or bypassed to AC Ground
for AC coupling. Similarly, the unused CLOCK input pin should
be bypassed with a 0.01 μF capacitor to V
EE .


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