The DS1886 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality for GPON/EPON and 10G PON ONU applications. The combination of the DS1886 with the MAX3710 supports all transmitter and receiver functionality. The DS1886 includes modulation current control and APC set-point control with tracking error adjustment. It continually monitors RSSI for LOS generation. A 13-bit analog-to-digital converter (ADC) monitors V_CC, temperature, laser bias, laser modulation, and receive power to meet all monitoring requirements. Receive power measurement is differential with support for common mode to V_CC. A 9-bit digital-to-analog converter (DAC) is included with temperature compensation for APD bias control.

DS1886: Block Diagram

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Key Features

Meets All SFF-8472 Control and Monitoring Requirements
Companion Controller for the MAX3710 Laser Driver/Limiting Amplifier and MAX3945 Limiting Amplifier
MAX3710/DS1886 Combination Supports Broad Spectrum of Continuous Mode and PON Applications Up to 2.5GHz
Temperature Lookup Table (LUT) to Compensate for APC Tracking Error and Dual Closed-Loop Variables
Three Laser Control Modes
- Dual Closed Loop: Laser Bias and Laser Modulation Are Automatically Controlled with Multiple LUTs to Compensate Dual Closed-Loop Calibration Points
- APC Loop: Laser Bias Automatically Controlled, Laser Modulation Controlled by Temperature LUT
- Open Loop: Laser Bias and Laser Modulation Are Controlled by Temperature LUTs
13-Bit ADC
- Laser Bias, Laser Power, and Receive Power Support Internal and External Calibration
- Differential Receive Power Input
- Scalable Dynamic Range
- Internal Direct-to-Digital Temperature Sensor
- Alarm and Warning Flags for All Monitored Channels
10-Bit DAC with Temperature Compensation for APD Bias
Digital I/O Pins: Transmit Disable Input/Output, Rate Select Input/Output, LOS Input/Output, Transmit Fault Input/Output, and IN1 Status Monitor and Fault input
Comprehensive Fault Measurement System with Maskable Alarm/Warnings
Flexible Password Scheme Provides Three Levels of Security
256-Byte A0h and 128-Byte Upper A2h EEPROM
I²C-Compatible Interface
3-Wire Master to Communicate with the MAX3710/MAX3711 Laser Driver/Limiting Amplifier and MAX3945 Limiting Amplifier

Applications/Uses

SFF, SFP, and PON ONU Modules

Key Specs

Part Number

ADCs

Resolution
(bits)

DACs/ Resistors

FS Out
(kΩ)

Steps

Temp. Sensor

Memory

V_SUPPLY
(V)

Control Interface

Package/Pins

Budgetary
Price

See Notes

DS1886

5-Input Muxable

2 DACs

None

Internal

EEPROM

2.85 to 3.9

I²C

TQFN/24

$1.32 @1k

See All Fiber Monitoring and Control (20)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Quality and Environmental Data

Product Reliability Reports: DS1886.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Order

Related Resources

DS1886

SFP and PON ONU Controller with Digital LDD Interface

Works with MAX3710 and MAX3711 LDD/Limiting Amp to Implement Extinction Ratio Control

Overview

Description