The DS1875 controls and monitors all functions for burstmode
transmitters, APD receivers, and video receivers.
It also includes a power-supply controller for APD bias
generation, and provides all SFF-8472 diagnostic and
monitoring functionality. The combined solution of the
DS1875 and the MAX3643 laser driver provides APC
loop, modulation current control, and eye safety functionality.
Ten ADC channels monitor VCC, temperature
(both internal signals), and eight external monitor inputs
(MON1–MON8) that can be used to meet transmitter,
digital receiver, video receiver, and APD receiver-signal
monitoring requirements. Four total DAC outputs are
available. A PWM controller with feedback and compensation
pins can be used to generate the bias for an APD
or as a step-down converter. Five I/O pins allow additional
monitoring and configuration.
Applications
BPON, GPON, or EPON Optical Triplexers
SFF, SFP, and SFP+ Transceiver Modules
APD Controller