DS1884
SFP and PON ONU Controller with Digital LDD Interface
Works with MAX3710 LDD/Laser Amplifier to Implement Extinction Ratio Control and Fully Support SFF-8472 Functionality
Part Details
- Meets All SFF-8472 Control and Monitoring Requirements
- Companion Controller for the MAX3710 Laser Driver/Limiting Amplifier and MAX3945 Limiting Amplifier
- MAX3710/DS1884 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
- 9-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 Laser Driver/Limiting Amplifier and MAX3945 Limiting Amplifier
The DS1884 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The combination of the DS1884 with the MAX3710 supports all transmitter and receiver functionality. The DS1884 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.
Applications
- SFF, SFP, and PON ONU Modules
Documentation
Data Sheet 1
Reliability Data 1
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Fiber Monitoring and Control 2 | ||
| DS1856 | NOT RECOMMENDED FOR NEW DESIGNS | Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection |
| DS1878 | NOT RECOMMENDED FOR NEW DESIGNS | SFP+ Controller with Digital LDD Interface |
| Optical Limiting Amplifiers 1 | ||
| MAX3945 | NOT RECOMMENDED FOR NEW DESIGNS | 1.0625Gbps to 11.3Gbps, SFP+ Dual-Path Limiting Amplifier |
| Product 2 | ||
| MAX3710 | 125Mbps to 2.5Gbps Integrated Limiting Amplifier/Burst-Mode Laser Driver with Dual-Loop Power Control | |
| MAX3711 | Obsolete | 125Mbps to 3.125Gbps Integrated Limiting Amplifier/Laser Driver with Dual-Loop Power Control |
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