DS1874
LAST TIME BUYSFP+ Controller with Digital LDD Interface
Combination of DS1874 and MAX3798/MAX3799 Provides APC Loop, Current Control, and Complete SFF-8472 Functionality
Part Details
- Meets All SFF-8472 Control and Monitoring Requirements
- Laser Bias Controlled by APC Loop and Temperature LUT to Compensate for Tracking Error
- Laser Modulation Controlled by Temperature LUT
- Six Analog Monitor Channels: Temperature, VCC, MON1–MON4
- MON1–MON4 Support Internal and External Calibration
- Scalable Dynamic Range
- Internal Direct-to-Digital Temperature Sensor
- Alarm and Warning Flags for All Monitored Channels
- Two 9-Bit Delta-Sigma Outputs with 36 Entry Temperature LUTs
- Digital I/O Pins: Five Inputs, Five Outputs
- Comprehensive Fault-Measurement System with Maskable Laser Shutdown Capability
- Flexible, Two-Level Password Scheme Provides Three Levels of Security
- 256 Additional Bytes Located at A0h Slave Address
- I²C-Compatible Interface
- 3-Wire Master to Communicate with the MAX3798/MAX3799 Laser Driver/Limiting Amplifier
- +2.85V to +3.9V Operating Voltage Range
- -40°C to +95°C Operating Temperature Range
- 28-Pin TQFN (5mm x 5mm) Package
The DS1874 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The combination of the DS1874 with the MAX3798/MAX3799 laser driver/limiting amplifier provides APC loop, modulation current control, and eye safety functionality. The DS1874 continuously monitors for high output current, high bias current, and low and high transmit power to ensure that laser shutdown for eye safety requirements are met without adding external components. Six ADC channels monitor VCC, temperature, and four external monitor inputs (MON1–MON4) that can be used to meet all monitoring requirements. MON3 is differential with support for common mode to VCC. Two digital-to-analog (DAC) outputs with temperature-indexed lookup tables (LUTs) are available for additional monitoring and control functionality.
Applications
- SFF, SFP, and SFP+ Transceiver Modules
Documentation
Data Sheet 1
Reliability Data 1
User Guide 1
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Fiber Monitoring and Control 1 | ||
| DS1856 | NOT RECOMMENDED FOR NEW DESIGNS | Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection |
| Laser Drivers 1 | ||
| MAX3798 | NOT RECOMMENDED FOR NEW DESIGNS | 1.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver |
| Product 1 | ||
| DS1873 | LAST TIME BUY | SFP+ Controller with Analog LDD Interface |
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