DS1886：SFP and PON ONU Controller with Digital LDD Interface

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

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 VCC, temperature, laser bias, laser modulation, and receive power to meet all monitoring requirements. Receive power measurement is differential with support for common mode to VCC. A 9-bit digital-to-analog converter (DAC) is included with temperature compensation for APD bias control.

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

DS1886: Block Diagram

Applications/Uses

SFF, SFP, and PON ONU Modules

DataSheet

title	Download file
DS1886 Data Sheet	DS1886.pdf

Parametrics

Part Number	ADCs	Resolution (bits)	DACs/ Resistors	FS Out (kΩ)	Steps	Temp. Sensor	Memory	V_SUPPLY (V)	Control Interface	Package/Pins	Budgetary Price
Part Number	ADCs	Resolution (bits)	DACs/ Resistors	FS Out (kΩ)	Steps	Temp. Sensor	Memory	V_SUPPLY (V)	Control Interface	Package/Pins	See Notes
DS1886	5-Input Muxable	13	2 DACs	None	None	Internal	EEPROM	2.85 to 3.9	I2C	TQFN/24	$1.32 @1k