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MAX3850D Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3850D Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page 2.7Gbps, +3.3V DC-Coupled Laser Driver _______________________________________________________________________________________ 7 Pin Description PIN NAME FUNCTION 1, 4, 7 VCC1 Power Supply for Digital Circuits 2 DATA+ Positive Data Input 3 DATA- Negative Data Input 5 CLK+ Positive Clock Input. Connect to VCC or leave unconnected if latch function is not used. 6 CLK- Negative Clock Input. Connect to VCC or leave unconnected if latch function is not used. 8 LATCH TTL/CMOS Latch Input. High for latched data, low for direct data. Internal 100k Ω pullup resistor to VCC. 9 ENABLE TTL/CMOS Enable Input. High for normal operation, low to disable laser bias and modulation current. Internal 100k Ω pullup resistor to VCC. 10 GND1 Ground for Digital Curcuits 11 BIASMON Bias Current Monitor. Current into this pin is proportional to the laser bias current. 12 MODMON Modulation Current Monitor. Current into this pin is proportional to the laser modulation current. 13 FAIL TTL/CMOS Failure Output. Indicates APC failure when low. 14 APCFILT Connect a capacitor (CAPCFILT = 0.1µF) from this pad to ground to filter the APC noise. 15 GND4 Ground for Output Curcuitry 16, 18, 21 VCC4 Power Supply for Output Circuitry 17 BIAS Laser Bias Current Output 19 OUT+ Positive Modulation Current Output. IMOD flows into this pad when input data is high. 20 OUT- Negative Modulation Current Output. IMOD flows into this pad when input data is low. 22 GND4 Ground for Modulation Current Source 23 GND3 Ground for APC Circuitry 24 MD Monitor Diode Input. Connect this pin to a monitor photodiode anode. A capacitor to ground is required to filter high-speed AC monitor photocurrent. 25 VCC3 Power Supply for APC 26 CAPC A capacitor connected from this pad to ground controls the dominant pole for the APC feedback loop (CAPC = 0.1µF). 27 GND2 Ground for Internal Reference 28 N.C. No Connection. Leave unconnected. 29 APCSET A resistor connected from this pad to ground sets the desired average optical power. Connect a 100k Ω resistor from this pad to ground if APC is not used. 30 MODSET A resistor connected from this pad to ground sets the desired modulation current. 31 BIASMAX A resistor connected from this pad to ground sets the maximum bias current. The APC function can subtract from this maximum value but cannot add to it. 32 VCC2 Power Supply for Internal Reference |
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