DS1875

PON Triplexer and SFP Controller

Industry's Next-Generation PON/SFP Controller with APD Boost Converter for Fiber Optic Modules

Obsolete

Not the part you were looking for?

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

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 Temperature-Indexed LUT
PWM Controller
Boost or Buck Mode
Boost Mode: Uses Optional External Components, Up to 90V Bias Generation
131kHz, 262kHz, 525kHz, or 1050kHz Selectable-Switching Frequency
APD Overcurrent Protection Using Optional Fast Shutdown
10 Analog Monitor Channels: Temperature, V_CC, 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

Additional Details

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. Ten ADC channels monitor V_CC, temperature (both internal signals), and eight external monitor inputs (MON1–MON8) that can be used to meet transmitter, digital receiver, video receiver, and APD receiver-signal monitoring requirements. Four total DAC outputs are available. A PWM controller with feedback and compensation pins can be used to generate the bias for an APD or as a step-down converter. Five I/O pins allow additional monitoring and configuration.

Applications