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MAX3867 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3867 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page laser package is used to convert the optical power into a photocurrent. The APC loop adjusts the laser bias current so that the monitor current is matched to a ref- erence current set by RAPCSET. The time constant of the APC loop is determined by an external capacitor (CAPC). To eliminate the pattern-dependent jitter asso- ciated with the APC loop-time constant, and to guaran- tee loop stability, the recommended value for CAPC is 0.1µF. When the APC loop is functioning, the maximum allow- able bias current is set by an external resistor, RBIASMAX. An APC failure flag (FAIL) is set low when the bias current can no longer be adjusted to achieve the desired aver- age optical power. To filter out the APC loop noise, use an external capacitor at APCFILT with a recommended value of 0.1µF. APC closed-loop operation requires the user to set three currents with external resistors connected between ground and BIASMAX, MODSET, and APCSET. Detailed guidelines for these resistor settings are described in the Design Procedure section. Open-Loop Operation If necessary, the MAX3867 is fully operational without APC. In this case, the laser current is directly set by two external resistors connected from ground to BIASMAX +3.3V, 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control 8 _______________________________________________________________________________________ LATCH CD CF RF VCC 1000pF IMD RAPCSET RBIASMAX RMODSET APCSET CAPC CAPC BIASMAX MD MODSET FAIL BIAS RD 25 Ω IMOD IBIAS LP LP VCC MUX DATA CLK 0 1 ENABLE OUT+ OUT- DQ 172X FAILURE DETECTOR 40X 5X MAX3867 Figure 4. Functional Diagram |
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