DTR-1250-MM
Transmitter Electrical Interface (over Operating Temperature, VCC = 4.75 to 5.25V)
Parameter
Input HIGH Voltage 1
Input LOW Voltage 1
Symbol
Minimum
Typical
Maximum
VCC - 0.700
VCC - 1.475
350
Units
V
VIH
VIL
IH
VCC - 1.165
-
-
-
-
VCC - 1.890
V
µA
µA
Data Input Current - HIGH
Data Input Current - LOW
-
-
IL
250
1 For AC-coupled modules, the input voltage swing is 0.3 V minimum and 1.2 V maximum.
Receiver Electrical Interface (over OperatingTemperature, VCC = 4.75 to 5.25V)
Parameter
Output HIGH Voltage 1
Output LOW Voltage 1
Symbol
VOH
Minimum
VCC - 1.035
VCC - 1.950
-
Typical
Maximum
VCC - 0.700
VCC - 1.595
25
Units
V
-
-
-
VOL
V
IO
Output Current
mA
1
For AC-coupled modules, the output voltage swing into 50-ohm load is 0.3 V minimum and 1 V maximum.
Electrical Power Supply Characteristics (over Operating Temperature, VCC = 4.75 to 5.25V)
Parameter
Symbol
VCC
Minimum
Typical
Maximum
Units
V
Supply Voltage
Supply Current
4.75
5.0
5.25
ICC
DC-coupled module
AC-coupled module
-
-
140
200
mA
mA
ICC
160
220
+5 volt
Capacitor values in µF, Resistor values in ohm
Application Notes
DATA interface (DC-coupled module): The interface
circuit for the standard DC-coupled module with direct-
coupled PECL interface is shown in Figure 1. The
termination resistors for the transmitter should be close to
the DTR transceiver module. The termination resistors for
the receiver (50 ohms to VCC - 2 volts or the Thevenin
equivalent resistors shown) should be close to the PHY or
SERDES IC (which receives the DATA outputs from the
receiver).
0.1
1 µH coil or
ferrite inductor
+
0.1
10
0.1
82
82
82
82
5
8
TXD+
TXD -
SIGNAL
DETECT
4
7
DTR-1250-MM
510
RXD+
RXD -
2
3
1 µH coil or
6
ferrite inductor
10
When interfacing with 3.3 V SERDES IC, AC coupling
can be used as shown in Figure 2. The termination resistors
required by the SERDES are not shown in this figure.
GND
POSTS
+
130
130
130
130
9
1
0.1
DATA interface (AC-coupled module): 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. The receiver can be connected directly to the
external 50 ohm load (termination resistor of the SERDES).
Fig.1 Interfacing DC-coupled module to direct-PECL signals
+5 volt
Capacitor values in
µ
F, Resistor values in ohm
0.1
1 µH coil or
ferrite inductor
68
68
+
0.1
10
0.1
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.
The SIGNAL DETECT output is PECL level requiring
termination (510 ohms to GND is recommended).
0.01
5
8
7
TXD+
TXD -
SIGNAL
DETECT
4
0.01
190
190
510 DTR-1250-MM
Power supply and grounding: The power supply line
should be well-filtered. All 0.1 µF power supply bypass
capacitors should be as close to the DTR transceiver module
as possible. The two front GND posts should be grounded
to Circuit Ground or Chassis Ground.
0.01
2
RXD+
RXD -
1 µH coil or
6
3
ferrite inductor
10
0.01
GND
POSTS
+
9
1
270
270
0.1
Fig.2 Interfacing DC-coupled module to 3.3 V SERDES
21737-0307, Rev. F
03-24-2003
2
5秒后页面跳转
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