Maxim Integrated DS1864T T&R

Description
The DS1864 is an SFF-8472 MSA-compliant laser controller and monitor designed for SFP optical transceiver modules. It controls laser driver bias and modulation currents through temperature-controlled current-sink DACs. System diagnostics are provided by monitoring three analog inputs, Vcc, and temperature through an internal temperature sensor. The device also includes all EEPROM required by the SFF-8472 MSA, including both A0h and A2h EEPROM. The DS1864's memory map can be configured to be compatible with both the DS1852/DS1856 and the DS1859 memory maps. Additionally, memory is secured with customer-configurable two-level password protection.

Features
Five monitored channels (temperature, Vcc, MON1, MON2, MON3)
Three external analog inputs (MON1, MON2, MON3) support internal and external calibration
Enhanced RSSI monitoring (26dB range, 0.5dB accuracy)
Scalable dynamic range for external analog inputs
Internal direct-to-digital temperature sensor
Alarm and warning flags for all monitored channels
Two linear 8-bit current-sink DACs
Two user-selectable full-scale ranges (0.5mA or 1.5mA)
Values changeable every 2°C
Three fast-trip comparators (Tx Power High, Tx Power Low, and Bias Current) for eye safety
Flexible, two-level password scheme provides three levels of security
Provides all optional and required SFF-8472 MSA EEPROM (Both A0h and A2h Memory)
I²C-Compatible serial interface
Operates from a 3.3V or 5V supply
-40°C to 95°C operating temperature range
28-Pin TQFN Package (5mm x 5mm)

Applications
SFP Optical Transceiver Modules
Laser Control and Monitoring