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.
Key Features
Applications/Uses
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
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