DS1875 - Maxim Integrated Products

DS1875 PON Triplexer and SFP Controller

The DS1875 controls and monitors all functions for burstmode transmitters, APD receivers, and video receivers. It also includes a power-supply controller for APD bias generation, and provides all SFF-8472 diagnostic and monitoring functionality. The combined solution of the DS1875 and the MAX3643 laser driver provides APC loop, modulation current control, an.

Features

♦ Meets All PON Burst-Timing Requirements for Burst-Mode Operation ♦ Laser Bias Controlled by APC Loop and Temperature Lookup Table (LUT) ♦ Laser Modulation Controlled by Temperature LUT ♦ Six Total DACs: Four External, Two Internal ♦ Two 8-Bit DACs, One of Which is Optionally Controlled by MON4 Voltage ♦ Internal 8-Bit DAC Controlled by a TemperatureIndexed LUT ♦ PWM Controller ♦ Boost or Buck Mode ♦ Boost Mode: Uses Optional External Components, Up to 90V Bias Generation ♦ 131kHz, 262kHz, 525kHz, or 1050kHz SelectableSwitching Frequency ♦ APD Overcurrent Protection Using Optional Fast Shutdo.