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DTR-1250-SM2-LS-L1-M Datasheet(PDF) 3 Page - OPLINK Communications Inc. |
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DTR-1250-SM2-LS-L1-M Datasheet(HTML) 3 Page - OPLINK Communications Inc. |
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3 / 5 page  3 21737-0283, Rev.A 06-25-03 Transmitter Electrical Interface (over Operating Case Temperature Range) Receiver Electrical Interface (over Operating Case Temperature Range) DTR-1250-SM2-LC & DTR-1250-SM2-LS Parameter Symbol Minimum Typical Maximum Units Output HIGH Voltage (LV-PECL) 1 VOH VCC - 1.10 - VCC - 0.70 V Output LOW Voltage (LV-PECL) 1 VOL VCC - 1.95 - VCC - 1.50 V Output HIGH Voltage (LV-TTL) VOH 2.4 - VCC Output LOW Voltage (LV-TTL) VOL 0- 0.8 Output Current IO -- 25 mA 1 With 50 ohm terminated to V CC - 2 volts. Parameter Symbol Minimum Typical Maximum Units Input HIGH Voltage VIH VCC - 1.165 - VCC - 0.880 V Input LOW Voltage VIL VCC - 1.810 - VCC - 1.475 V Data Input Current - HIGH IH - - 150 µA Data Input Current - LOW IL 0.5 - - µA Transmitter Disable Voltage VDIS 2.0 - VCC V Transmitter Enable Voltage VEN 0- 0.8 V Differential Bias Monitor Voltage (Ta = 25°C) VBM+ - VBM- 0.02 - 0.12 V Differential Back Facet Monitor Voltage VFM+ - VFM- -100 - mV PIN FUNCTION PIN FUNCTION 1 VPD 11 VCCTX 2 RX GND 12 TX GND 3 RX GND 13 TX DISABLE 4 N/C 14 TD+ (TX DATA IN +) 5 N/C 15 TD- (TX DATA IN -) 6 RX GND 16 TX GND 7VCCRX 17 BM - (BIAS MONITOR -) 8 SD (RX SIGNAL DETECT) 18 BM + (BIAS MONITOR +) 9 RD- ( RX DATA OUT-) 19 FM - (FACET MONITOR -) 10 RD+ ( RX DATA OUT+) 20 FM + (FACET MONITOR +) Pin Assignments Transmitter: When the DATA+ input is at logic HIGH and DATA- input is at logic LOW, the Laser Diode is ON; and vice versa. 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 CC - 1.3 V, the laser is turned off 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. Therefore, when the input data is all continuous “zeroes” or all continuous “ones”, the transmitter optical output power is a constant level equal to thenominal average optical output power (not at the “OFF” level or at the “ON” level). 200 Ω 10 Ω PD Imon Ib LD 3 ΚΩ 3 ΚΩ FM + BM + VCC VCC GND GND FM - BM - 3 ΚΩ 3 ΚΩ Application Notes Receiver: Both differential DATA+ and DATA- outputs are LV- PECL levels requiring proper termination (see recommended interface circuits). For optimum performance, both outputs should be terminated in the same manner, even if only one is used. The Signal Detect circuit monitors the level of the incoming optical signal and generates a logic LOW signal when insufficient photocurrent is produced. If the SIGNAL DETECT output is LV-TTL level, no termination is required. If the SIGNALDETECT output is LV-PECL level, a termination resistor of 160 ohms to GND is required. |
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Similar Description - DTR-1250-SM2-LS-L1-M |
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