DS1876 具有双LDD接口的SFP控制器

The DS1876 controls and monitors all functions for dual transmitter modules. The memory map is based on SFF-8472. The DS1876 supports APC and modulation control and eye safety functionality for two laser drivers. It continually 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 that can be used to meet all monitoring requirements.

关键特性

Meets All SFF-8472 Transmitter Control and Monitoring Requirements

Six Analog Monitor Channels: Temperature, V_CC, PMON1, BMON1, PMON2, BMON2

• PMON_ and BMON_ Support Internal and External Calibration
• Scalable Dynamic Range
• Internal Direct-to-Digital Temperature Sensor
• Alarm and Warning Flags for All Monitored Channels

Six Quick Trips for Fast Monitoring of Critical Functions for Laser Safety

Four 10-Bit Delta-Sigma Outputs

• Each Controlled by 72-Entry Temperature Lookup Table (LUT)

Digital I/O Pins: Six 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

Transmitter 1 Is Accessed at A2h Slave Address

Transmitter 2 Is Accessed at B2h Slave Address

I²C-Compatible Interface

+2.85V to +3.9V Operating Voltage Range

-40°C to +95°C Operating Temperature Range

28-Pin TQFN (5mm x 5mm x 0.8mm) Package

应用/使用

双Tx视频SFP模块

典型工作电路