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GD16521-D Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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GD16521-D Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
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6 / 13 page  Pin List Mnemonic: Pad and Pin No.: Pin Type: Description: SDIP SDIN 4 5 CML IN Data inputs. Internally terminated with 50 W to TDIP/TDIN. TDIP TDIN 3 6 CML IN Loop through termination pins for SDIP and SDIN respectively. SCIP SCIN 9 10 CML IN Clock inputs. Internally terminated with 50 W to TCIP/TCIN. TCIP TCIN 8 11 CML IN Loop through termination pins for SDIP and SDIN respectively. IM 29, 30 OPEN COLLECTOR Laser Driver Output (2.5 Gbit/s). IM sinks a modulation current, which is controlled by the pin IMSET. A logic HI on SDIP corre- sponds to IM sinking current. IMB 31, 32 OPEN COLLECTOR Laser Driver inverted Output (2.5 Gbit/s). IMB sinks a modulation current, which is controlled by the pin IMSET. Connect to VCC through 20 to 25 W. IB 27 OPEN COLLECTOR Pre-bias current output. IB sinks a current, which is controlled by the pin IMC. IMSET 40 ANL OUT Modulation current control monitor output. This pin is the output of the modulation current control loop OP-amp. For stability a capa- citor may be added between this pin and the IMC pin. IBSET 22 ANL OUT Pre-bias current control monitor output. This pin is the output of the optical power control loop OP-amp. For stability a capacitor may be added between this pin and the OPSET pin. IBM 23 ANL OUT Pre-bias current mirror output. The sink current into the IBM pin is 1/20 of the pre-bias current. IMM 39 ANL OUT Modulation current mirror output. The sink current into the IMM pin is 1/20 of the modulation current. Internally IMM is connected to the positive input of the modulation current control loop OP-amp. AR 25 ANL OUT Anti-rush current sink. AR sinksa1mA current when SHDW is high. Typically connected together with PD to the monitor diode. MARKP MARKN 35 36 ANL OUT Mark-space monitor outputs. High impedance CML outputs. MTJ 38 ANL OUT Temperature monitor. IMC 41 ANL IN Modulation current setting. The modulation current will automati- cally be adjusted to this value if the internal modulation control loop is used. The IMC pin is the negative input of the modulation current control loop OP-amp. PD 26 ANL IN Positive input of the automatic optical power control loop OP-amp, used to control the pre-bias current. Typically connected to the monitor diode photo detector of the laser diode. OPSET 19 ANL IN Negative input of the automatic optical power control loop OP-amp, used to control the pre-bias current. Typically connected to an external reference voltage. FFSET 15 LVTTL IN When FFSET is low data is re-timed. When high data re-timing is bypassed. SHDW 16 LVTTL IN Modulation and pre-bias current shutdown input. Set high for shutdown, low for normal operation. DUTY 48 ANL IN Input for control of the mark-space ratio of the output. Decreasing the voltage of the DUTY pin increases the pulse width of a current high into the IM pin. Typically connected to VEE through resistor. VCC 14, 18, 20, 28, 33, 42, 46 PWR Positive supply pins for laser driver part. VCCCONT 44 PWR Positive supply pin for modulation current control system. Data Sheet Rev.: 11 GD16521 Page 6 of 13 |
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