DTR-1250-SM-LC/LS-MR
Transmitter Electrical Interface (over Operating Case Temperature Range)
Parameter
Input HIGH Voltage 1
Input LOW Voltage 1
Symbol
Minimum
VCC - 1.165
VCC - 1.950
VCC - 1.3
0
Typical
Maximum
VCC - 0.700
VCC - 1.475
VCC
Units
VIH
-
-
-
-
V
V
V
V
VIL
VDIS
Transmitter Disable Voltage
VEN
Transmitter Enable Voltage
0.8
1
For AC-coupled modules, the input voltage swing is 0.25 V minimum and 1.2 V maximum single-ended.
Receiver Electrical Interface (over Operating Case Temperature Range)
Parameter
Output HIGH Voltage (LV-PECL) 1,2
Output LOW Voltage (LV-PECL) 1,2
Output HIGH Voltage (LV-TTL)
Output LOW Voltage (LV-TTL)
Symbol
VOH
Minimum
Typical
Maximum
VCC - 0.90
VCC - 1.60
VCC
Units
VCC - 1.10
-
-
-
-
-
V
V
VOL
VCC - 1.84
VOH
2.4
0
VOL
0.8
IO
Output Current
-
25
mA
1
With 50 ohm terminated to VCC - 2 volt (for DC-coupled modules).
For AC-coupled modules, the output voltage swing into 50-ohm load is 0.3 V minimum and 1 V maximum single-ended.
2
Electrical Power Supply Characteristics (over Operating Case Temperature Range)
Parameter
Symbol
Minimum
Typical
Maximum
Units
VCC
ICC
ICC
Supply Voltage
Supply Current 1
3.13
3.3
150
175
3.47
220
245
V
DC-coupled module
AC-coupled module
-
-
mA
mA
1 Supply current does not include termination.
+3.3 volt
Application Notes
Capacitor values in
µ
F, Resistor values in ohm
1 µH coil or
ferrite inductor
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 50 ohm termination.
+
0.1
10
0.1
160 160
50 ohm line
µ
1 H coil or
2
TXD+
9
6
ferrite inductor
10
+
LV-PECL
100
10
50 ohm line
0.1
DATA interface (AC-coupled modules):
For modules with AC coupling option, both
transmitter and receiver interface has internal
bias, termination and AC coupling capacitor.
The transmitter can be connected directly to
the driving SERDES as shown in Fig. 2. The
receiver can be connected directly to the
external 50 ohm loads (termination resistor
of the SERDES). For best performance, both
DATA+ & DATA- should be used.
TXD -
RXD+
50 ohm line
5
8
TX DISABLE
LV-PECL
100
50 ohm line
RXD -
4
1
SIGNAL DETECT
3
GND
POSTS
7
160 160
Fig.1 DC-coupled modules
µF, Resistor values in ohm
+3.3 volt
Capacitor values in
1 µH coil or
TX DISABLE: The transmitter is normally
enabled (i.e. when the TX DISABLE control
input is not connected or at LV-TTL logic
LOW). When the TX DISABLE voltage is
higher than VCC - 1.3 V, the laser is turned off
independent of the input data.
ferrite inductor
depending on SERDES
+
0.1
10
0.1
160
160
50 ohm line
µ
1 H coil or
2
TXD+
9
6
ferrite inductor
10
100
+
50 ohm line
50 ohm line
0.1
TXD -
RXD+
10
5
SIGNAL DETECT: The Signal Detect
circuit monitors the level of the incoming
optical signal and generates a logic LOW
signal when insufficient photocurrent is
produced. Its output is LV-TTL with no
termination required.
SERDES
8
TX DISABLE
100
50 ohm line
RXD -
SIGNAL DETECT
4
3
GND
POSTS
7
1
depending on SERDES
Fig.2 AC-coupled modules
21737-0337, Rev. A
5-16-2002
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