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DTR-1250-MM-ST Datasheet(PDF) 2 Page - OPLINK Communications Inc. |
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DTR-1250-MM-ST Datasheet(HTML) 2 Page - OPLINK Communications Inc. |
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2 / 6 page  2 21737-0307, Rev. F 03-24-2003 1 9 2 3 7 8 6 5 4 + + +5 volt 1 H coil or ferrite inductor µ 1 H coil or ferrite inductor µ TXD+ TXD - SIGNAL DETECT RXD - RXD+ GND POSTS 0.1 0.1 10 10 0.1 0.1 0.01 0.01 190 68 510 68 190 270 270 Capacitor values in F, Resistor values in ohm µ 0.01 0.01 Transmitter Electrical Interface (over Operating Temperature, V CC = 4.75 to 5.25V) Receiver Electrical Interface (over Operating Temperature, V CC = 4.75 to 5.25V) Electrical Power Supply Characteristics (over Operating Temperature, V CC = 4.75 to 5.25V) 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 V CC - 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). 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. 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). 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). 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. DTR-1250-MM Application Notes DTR-1250-MM 1 9 2 3 7 8 6 5 4 + + +5 volt 1 H coil or ferrite inductor µ 1 H coil or ferrite inductor µ TXD+ TXD - SIGNAL DETECT RXD - RXD+ GND POSTS 0.1 0.1 10 10 0.1 0.1 130 82 510 82 82 82 130 130 130 Capacitor values in F, Resistor values in ohm µ DTR-1250-MM Fig.2 Interfacing DC-coupled module to 3.3 V SERDES Fig.1 Interfacing DC-coupled module to direct-PECL signals Parameter Symbol Minimum Typical Maximum Units Supply Voltage VCC 4.75 5.0 5.25 V Supply Current DC-coupled module ICC -140 200 mA AC-coupled module ICC -160 220 mA Parameter Symbol Minimum Typical Maximum Units Output HIGH Voltage 1 VOH VCC - 1.035 - VCC - 0.700 V Output LOW Voltage 1 VOL VCC - 1.950 - VCC - 1.595 V Output Current IO -- 25 mA 1 For AC-coupled modules, the output voltage swing into 50-ohm load is 0.3 V minimum and 1 V maximum. Parameter Symbol Minimum Typical Maximum Units Input HIGH Voltage 1 VIH VCC - 1.165 - VCC - 0.700 V Input LOW Voltage 1 VIL VCC - 1.890 - VCC - 1.475 V Data Input Current - HIGH IH -- 350 µA Data Input Current - LOW IL -- 250 µA 1 For AC-coupled modules, the input voltage swing is 0.3 V minimum and 1.2 V maximum. |
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