dtr-2488-sm2-lc-ls-w-g-mr OPLINK Communications Inc., dtr-2488-sm2-lc-ls-w-g-mr Datasheet - Page 4

• Manufacturer Part Number: dtr-2488-sm2-lc-ls-w-g-mr
• Description: Multi-rate Oc-48/stm-16 2x10 Sff Single Mode Transceivers
• Manufacturer: OPLINK Communications Inc.

Application Notes
DATA interface (DC-coupled modules): The interface
circuit for standard DC-coupled modules with direct-coupled
LV-PECL interface is shown in Fig. 1. The transmitter input
has internal 50Ω termination.
DATA interface (AC-coupled modules): For modules with
AC coupling option, both transmitter and receiver interfaces
have internal bias, 50Ω termination and AC coupling capacitors.
The transmitter can be connected directly to the driving
SERDES as shown in Fig. 2. The receiver can be connected
directly to the external 50Ω loads (termination resistor of the
SERDES). For best performance, both DATA+ & DATA-
should be used.
DTR-2488
Receiver Power Monitor option 1
Receiver Power Monitor option 2
DTR-2488
806Ω
806Ω
1
1
Vcc
Recommended external current
monitor resistor value is 1kΩ
R1
R1: 510
R2: 2k
External resistor
AD8551 or
equivalent
Ω
Vcc
Ω
recommended
DTR-2488-SM2-LC/LS-W-G-MR
2N3906 or
equivalent
R1
R2
RPM
(see Power Monitor Options)
(see Power Monitor Options)
SIGNAL DETECT
SIGNAL DETECT
+
+
10
10
ferrite inductor
+3.3V
+3.3V
ferrite inductor
Vcc
1 H coil or
Vcc
1 H coil or
µ
ferrite inductor
ferrite inductor
RPM
µ
0.1
RPM
0.1
1 H coil or
1 H coil or
4
µ
µ
SIGNAL DETECT: The SIGNAL DETECT circuit monitors
the incoming optical signal level and generates a logic LOW
signal when an insufficient photocurrent is produced. The output
is LV-TTL with no termination required.
TX DISABLE: The transmitter is normally enabled (i.e. when
the TX DISABLE control input is not connected). When the
TX DISABLE control input voltage is higher than V
the laser is turned off independent of the input data.
Power supply and grounding: The power supply line should
be well-filtered. All 0.1µF power supply bypass capacitors
should be as close to the DTR transceiver module as possible.
The module case ground is internally AC-coupled to the circuit
ground.
0.1
0.1
+
+
10
10
Capacitor values in F, Resistor values in
11
1
8
Fig.1 DC-coupled modules
Capacitor values in F, Resistor values in
Fig.2 AC-coupled modules
1
2,3,6
11
8
2,3,6
DTR-2488-SM2
DTR-2488-SM2
0.1
0.1
chassis
POSTS
ground
POSTS
chassis
ground
GND
7
GND
7
100
100
12,16
12,16
14
10
15
9
14
10
15
9
TD+
TD-
depends on SERDES
RD+
RD-
µ
TD+
RD+
TD-
RD-
µ
160
50
50
50
50
Ω
Ω
Ω
Ω
50
50
160
depends on SERDES
line
line
line
line
50
50
Ω
Ω
Ω
Ω
line
line
line
line
160
160
Ω
21737-0274, Rev. B
100
Ω
160
100
160
LV-PECL
LV-PECL
SERDES
06-29-2005
CC
- 1.3V,