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MAX3263 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX3263 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 12 page Single +5V, Fully Integrated, 155Mbps Laser Diode Driver 4 _______________________________________________________________________________________ ______________________________________________________________Pin Description NAME FUNCTION PIN 10 ENB+ Noninverting Enable TTL Input. Output currents are enabled only when ENB+ is high and ENB- is low. 1 VREF2 Temperature-Compensated Reference Output. VREF2 is internally connected to VREF1. 12 OSADJ Overshoot-Adjust Input. Connect to internal voltage reference through a resistor to adjust the overshoot of the modulation output signal (see Typical Operating Characteristics). 11 VREF1 Temperature-Compensated Reference Output. VREF1 is internally connected to VREF2. 13 IBIASFB Bias-Feedback Current Output. Output from automatic power-control circuit. Connect to IBIASSET when using APC. 14 IBIASSET Laser Bias Current-Programming Input. Connect to internal voltage reference through a resis- tor to set bias current (see Typical Operating Characteristics). IBIASOUT = 40 x (IBIASSET + IBIASFB). 15 IMODSET Laser Modulation Current-Programming Input. Connect to internal voltage reference through a resistor to set modulation current (see Typical Operating Characteristics). IMOD = 20 x IMODSET. 16 IBIASOUT Laser Bias Current Output. Connect to laser cathode through an R-L filter network (see the Bias Network Compensation section). 17, 19, 21 GNDA Ground for Bias and Modulation Current Drivers 22 VCCA +5V Supply Voltage for Bias and Modulation Current Drivers. Connect VCCA to the same potential as VCCB, but provide separate bypassing for VCCA and VCCB. 20 OUT+ Modulation Output. When VIN+ is low and VIN- is high, OUT+ sinks IMOD. 9 ENB- Inverting Enable TTL Input. Output currents are enabled only when ENB+ is high and ENB- is low. 8 VCCB +5V Supply Voltage for Voltage Reference and Automatic Power-Control Circuitry. Connect VCCB to the same potential as VCCA, but provide separate bypassing for VCCA and VCCB. 6 VIN- Inverting PECL Data Input 5 VIN+ Noninverting PECL Data Input 4, 7 GNDB Ground for Voltage Reference and Automatic Power-Control Circuitry 3 FAILOUT Failout Output. Active-low, open-collector TTL output indicates if automatic power-control loop is out of regulation due to insufficient monitor-diode current (when VPIN is below the 2.6V threshold). Connect FAILOUT to VCC through a 2.7k Ω pull-up resistor. 2 IPINSET Monitor Photodiode Programming Input. Connect INPINSET to VREF1 or VREF2 through a resistor to set the monitor current when using automatic power control (see Typical Operating Characteristics). 18 OUT- Modulation Output. When VIN+ is high and VIN- is low, OUT- sinks IMOD. 23 IPIN Monitor Photodiode Current Input. Connect IPIN to photodiode’s anode. 24 SLWSTRT Slow-Start Capacitor Input. Connect capacitor to ground or leave unconnected to set start-up time, tSTARTUP = 25.4kΩ (CSLWSTRT + 2pF). |
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