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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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GD16521 датащи(PDF) 4 Page - List of Unclassifed Manufacturers |
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GD16521 датащи(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 13 page  Applications Temperature Monitor An on-chip, diode connected transistor is used to monitor the junction temperature in the proximity of the output stage. The voltage at pin MTJ decreases with in- creasing temperature, see Figure 4. Figure 4. Temperature Monitor. Figure 5. Voltage at pin MTJ versus Temperature. DC Coupling For a compact design, pre-bias and mod- ulation current can be DC coupled. DC coupling is appropriate when connections between laser driver and laser diode are kept short (with low inductance) as achieved, e.g. by flip-chip mounting of the two dice in close proximity, see Figure 10 on page 5. The GD16521 is optimized for this configuration. AC Coupling AC coupling is recommended for the packaged version, in particular when the output is connected to the laser diode through a transmission line, see Figure 6. Figure 6. AC coupled output. Duty Cycle Adjustment The “on-time” of the laser current (IM-pin) can be increased up to 20% by control- ling the voltage at the Duty input. In the configuration in Figure 7, a smaller R re- sults in a longer on-time. The duty cycle adjustment can be monitored using the Mark/Space monitor outputs (MARKP/ MARKN), see Figure 8. Figure 7. Duty cycle adjustment with an external resistor. Figure 8. MARKP/MARKN outputs. Laser Diode Slope Efficiency Compensation The pre-bias control loop may be used to make a simple compensation for changes in the slope efficiency of a laser diode, in order to maintain a constant ex- tinction ratio. Typically the slope effi- ciency of the laser diode is inversely proportional to the threshold current, as shown in Figure 9 below. Therefore the pre-bias monitor current will compensate changes in the threshold current of the laser diode if it is added to the reference voltage on pin IMC at a ratio. This ratio may be chosen individually for the spe- cific laser diode and is set by an external R as shown in Figure 3 on page 3. Thereby the extinction ratio may be maintained at a constant ratio. The varia- tion of the pre-bias monitor current com- pared to the pre-bias current is only +/-1% over temperature and supply, en- suring that the performance is not sacri- ficed by changes in this ratio. Figure 9. Laser diode characteristics Data Sheet Rev.: 11 GD16521 Page 4 of 13 VCC VEE MTJ 2k TEMP 0 50 100 -30 130 0. 80V 0. 90V 1. 00V 0. 75V L1 220uH L3 220uH L2 IMB IM IB L4 L 100nF 100nF 25W 25W VCC VCC VCC VCC VCC VCC VEE VEE 1k R VEE DUTY 100nF MARKP MARKP PO IL L1 and L3 = Siemens Chip Inductors (B82432A1224K). L2 and L4 = Siemens ferrite cores B64290-A36-X33 with 8 turns of 0.22mm Cu-Wire. |
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