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DS1865T+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS1865T+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 66 page PON Triplexer Control and Monitoring Circuit 10 ____________________________________________________________________ Detailed Description The DS1865 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 the low-power CMOS process, while leaving only the high-speed portions to the laser driver. Key components of the DS1865 are shown in the Block Diagram and described in subsequent sections. Table 1 contains a list of acronyms used in this data sheet. 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. Typical Operating Circuit BEN+ BEN- DIS IN- IN+ OUT- BIAS- BIAS+ MDIN COMPACT BURST-MODE LASER DRIVER DS1865 BURST-MODE MONITOR/CONTROL CIRCUIT MDOUT OUT+ VCC TX-F TX-D SCL SDA LOSI D1 D2 D0 D3 MON2 MON3 MON4 FETG DAC1 M4DAC MON1 3.3V THERMISTOR APD BOOST DC-DC BMD 3.3V TRANSMIT POWER DISABLE INPUT RECEIVER LOS OPEN-DRAIN LOS OUTPUT FAULT OUTPUT I2C COMMUNICATION RECEIVE POWER ADDITIONAL DIGITAL I/O CATV 12V FTTH CATV TIA MAX3643 MAX3654 Table 1. Acronyms ACRONYM DEFINITION ADC Analog-to-Digital Converter APC Average Power Control ATB Alarm Trap Bytes DAC Digital-to-Analog Converter LUT Lookup Table NV Nonvolatile PON Passive Optical Network QT Quick Trip SEE Shadowed EEPROM TE Tracking Error TXP Transmit Power |
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