DS1865 Datasheet | Maxim Integrated

Description The DS1865 controls and monitors all the burst-mode transmitter and video receiver biasing functions for a passive optical network (PON) triplexer. It has an APC loop with tracking-error pensation that provides the reference for the laser driver bias current and a temperature-indexed lookup table (LUT) that controls the modulation current. It continually monitors for high output current, high bias current, and low and high transmit power with its internal fast parators to ensure that laser shutdown for eye safety requirements are met without adding external ponents. Six ADC channels monitor VCC, internal temperature, and four external monitor inputs (MON1- MON4) that can be used to meet transmitter and video receive signal monitoring requirements. Two digital-to-analog converter (DAC) outputs are available for biasing the video receiver channel, and five digital I/O pins are present to allow additional monitoring and configuration. Features o Meets GEPON, BPON, and GPON Timing Requirements for Burst-Mode Transmitters o Bias Current Control Provided by APC Loop with Tracking-Error pensation o Modulation Current is Controlled by a Temperature-Indexed Lookup Table o Laser Power Leveling from -6d B to +0d B o Two 8-Bit Analog Outputs, One is Controlled by MON4 Voltage for Video Amplifier Gain Control o Internal Direct-to-Digital Temperature Sensor o Six Analog Monitor Channels: Temperature, VCC, MON1, MON2, MON3, and MON4 o Five Digital I/O Pins for Additional Control and Monitoring Functions o prehensive Fault Management System with Maskable Laser Shutdown Capability o Two-Level Password Access to Protect Calibration Data o 120 Bytes of Password 1 Protected Nonvolatile Memory Applications Optical Triplexers with GEPON, BPON, or GPON Transceiver Pin Configuration TOP VIEW N.C. BMD LOSI D3 D2 D1 D0 28 BEN TX-D TX-F FETG VCC GND N.C. 1 2 3 4 5 6 7 8 SDA 9 SCL 10 N.C. 11 N.C. 12 MON1 13 MON2 14 MON3 27 26 25 24 23 22 21 20 19 MOD BIAS VCC GND M4DAC...