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DS1863 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1863 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 62 page Burst-Mode PON Controller With Integrated Monitoring 8 _____________________________________________________________________ Detailed Description The DS1863 integrates the control and monitoring func- tionality required to implement a PON system using Maxim’s MAX3643 compact burst mode laser driver. The compact laser driver solution offers a considerable cost benefit by integrating control and monitoring fea- tures in low power CMOS process, while leaving only the high speed portions to the laser driver IC. APC Control BIAS current is controlled by an Average Power Control (APC) loop. The APC loop uses digital techniques to overcome the difficulties associated with controlling burst mode systems. The APC loop’s feedback is the monitor diode (BMD) current, which is converted to a voltage using an exter- nal resistor. The feedback voltage is compared to an 8- bit scaleable voltage reference, which determines the APC set point of the system. Scaling of the reference voltage along with the modulation output can be uti- lized to implement GPON power leveling. The DS1863 has a Lookup Table to allow the APC set point to change as a function of temperature to com- pensate for Tracking Error (TE). The TE LUT (Table 05h), has 36 entries that determine the APC setting in 4°C windows between -40°C to +100°C. Ranging of the APC DAC is possible by programming a single byte in Table 02h. Typical Operating Circuit BEN+ BEN- DIS MAX3643 IN- IN+ OUT- BIAS- BIAS+ MDIN COMPACT BURST MODE LASER DRIVER DS1863 BURST MODE MONITOR/CONTROL CIRCUIT MDOUT OUT+ VCC TX-F TX-D SCL SDA MON2 MON3 FETG MON1 BMD 3.3V TRANSMIT POWER RECEIVE POWER I2C COMMUNICATION FAULT OUTPUT DISABLE INPUT |
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