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General Description

The DS1875 controls and monitors all functions for burst-mode 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, and eye safety functionality.

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 Shutdown

? 10 Analog Monitor Channels: Temperature, VCC, Eight Monitors

? Internal, Factory-Calibrated Temperature Sensor

? RSSI with 29dB Electrical Dynamic

? Five I/O Pins for Additional Control and Monitoring Functions, Four of Which are Either Digital I/O or Analog Monitors

? Comprehensive Fault-Measurement System with Maskable Laser Shutdown Capability

? Two-Level Password Access to Protect Calibration Data

? 120 Bytes of Password-1 Protected Memory

? 128 Bytes of Password-2 Protected Memory in Main Device Address

? 256 Additional Bytes Located at A0h Slave Address

? I2C-Compatible Interface for Calibration and Monitoring

? 2.85V to 3.9V Operating Voltage Range

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

? 38-Pin TQFN (5mm x 7mm) Package

Applications

??? BPON, GPON, or EPON Optical Triplexers

??? SFF, SFP, and SFP+ Transceiver Modules

??? APD Controller