SFP and PON ONU Controller with Digital LDD Interface

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

* 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