DS1873 具有模擬LDD接口的SFP+控制器
概述
The DS1873 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The DS1873 provides APC loop, modulation current control, and eye safety functionality. The DS1873 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.
關(guān)鍵特性
Meets All SFF-8472 Control and Monitoring Requirements
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
Four 10-Bit Delta-Sigma Outputs with 36 Entry Temperature LUTs
- Laser Bias Controlled by APC Loop and Temperature LUT to Compensate for Tracking Error
- Laser Modulation Controlled by 72-Entry Temperature LUT
- Two Additional DACs Controlled by One 72-Entry and One 36-Entry Temperature LUT
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
120 Bytes of Password-1 Protected Memory
128 Bytes of Password-2 Protected Memory in Main Device Address
256 Additional Bytes Located at A0h Slave Address
I2C-Compatible Interface
+2.85V to +3.9V Operating Voltage Range
28-Pin TQFN (5mm x 5mm) Package
應(yīng)用/使用
SFF、SFP和SPF+收發(fā)模塊
典型工作電路
掃一掃添加微信