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General Description

The DS1863 controls and monitors all the burst-mode transmitter and video receiver biasing functions for a passive optical network (PON) transceiver. It has an APC loop with tracking-error compensation that provides the reference for the laser driver’s 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 comparators to ensure that laser shutdown for eye safety requirements are met without adding external components. Five ADC channels monitor VCC, internal temperature, and three external monitor inputs (MON1, MON2, MON3) that can be used to meet transmitter and receive monitoring requirements.

Features

? Meets BPON, GPON, and GEPON Timing Requirements for Burst-Mode Transceivers

? Bias Current Control Provided by APC Loop with Tracking Error Compensation

? Modulation Current Is Controlled by a Temperature-Indexed Lookup Table

? Supports 0dB, -3dB, -6dB Power Leveling Settings with No Additional Calibration

? Internal Direct-to-Digital Temperature Sensor

? Five Analog Monitor Channels: Temperature, VCC, MON1, MON2, and MON3

? Comprehensive Fault Management System with Maskable Laser Shutdown Capability

? Two-Level Password Access to Protect Calibration Data

? 120 Bytes of Password 1 (PW1) Protected Nonvolatile Memory

? 128 Bytes of Password 2 (PW2) Protected Nonvolatile Memory

? I2C-Compatible Interface for Calibration and Monitoring

? Operating Voltage: 2.85V to 3.9V

? Operating Temperature: -40°C to +95°C

? 16-Pin, Lead-Free TSSOP Package