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PON Triplexer Control and Monitoring Circuit

Complete Control, Calibration, and Monitoring Solution for GPON, BPON, and GEPON Transceivers

Product Details

Key Features

Applications/Uses

Parametric specs for Fiber Monitoring and Control
ADCs 6-Input Muxable
Resolution (bits) 13
# DACs/ Resistors 3 DACs
Temp. Sensor Internal
Memory EEPROM
VSUPPLY (V) 5
Control Interface I2C
Package/Pins TQFN/28
Budgetary
Price (See Notes)
$2.66 @1k
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Simplified Block Diagram

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Parameters

Parametric specs for Fiber Monitoring and Control
ADCs 6-Input Muxable
Resolution (bits) 13
# DACs/ Resistors 3 DACs
Temp. Sensor Internal
Memory EEPROM
VSUPPLY (V) 5
Control Interface I2C
Package/Pins TQFN/28
Budgetary
Price (See Notes)
$2.66 @1k

Key Features

  • Meets GEPON, BPON, and GPON Timing Requirements for Burst-Mode Transmitters
  • Bias Current Control Provided by APC Loop with Tracking-Error Compensation
  • Modulation Current is Controlled by a Temperature-Indexed Lookup Table
  • Laser Power Leveling from -6dB to +0dB
  • Two 8-Bit Analog Outputs, One is Controlled by MON4 Voltage for Video Amplifier Gain Control
  • Internal Direct-to-Digital Temperature Sensor
  • Six Analog Monitor Channels: Temperature, VCC, MON1, MON2, MON3, and MON4
  • Five Digital I/O Pins for Additional Control and Monitoring Functions
  • Comprehensive Fault Management System with Maskable Laser Shutdown Capability
  • Two-Level Password Access to Protect Calibration Data
  • 120 Bytes of Password 1 Protected Nonvolatile Memory
  • 128 Bytes of Password 2 Protected Nonvolatile Memory in Main Device Address
  • 128 Bytes of Nonvolatile Memory Located at A0h Slave Address
  • I²C-Compatible Interface for Calibration and Monitoring
  • Operating Voltage: 2.85V to 3.9V
  • Operating Temperature Range: -40°C to +95°C
  • Packaging: 28-Pin Lead-Free TQFN (5mm x 5mm x 0.8mm)

Applications/Uses

  • Optical Triplexers with BPON, GPON, or GEPON Transceiver

Description

The DS1865 controls and monitors all the burst-mode transmitter and video receiver biasing functions for a passive optical network (PON) triplexer. It has an APC loop with tracking-error compensation that provides the reference for the laser driver 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. Six ADC channels monitor VCC, internal temperature, and four external monitor inputs (MON1—MON4) that can be used to meet transmitter and video receive signal monitoring requirements. Two digital-to-analog converter (DAC) outputs are available for biasing the video receiver channel, and five digital I/O pins are present to allow additional monitoring and configuration.

Simplified Block Diagram

DS1865: Typical Operating Circuit DS1865: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .