I7070 Datasheet, PDF (1/1 Pages) Taiwan Memory Technology – General Description

i7070
General Description
The i7070 is a +3.3V/5V laser diode driver for SFP/SFF applications up to
1.25Gbps. The device accepts differential input data and provides bias and
modulation currents for driving a laser. DC-coupling laser to the device eases of multi
rate applications and reduces the external component count. The i7070 is fully
compliant with the SFP MSA timing and the SFF- 8472 transmit diagnostic
requirements.
An automatic power control (APC) feedback loop is incorporated to maintain a
constant average optical power over temperature and lifetime. Optional temperature
compensation compensates Laser Diode extinction ratio change with temperature over
500PPM ~ 10,000PPM range. The wide modulation current range of 5mA to 85mA
and bias current of 1mA to 100mA make this product ideal for driving FP/DFB laser
diodes in fiber optic modules.
The i7070 also provides transmit-disable control (DISABLE), a single-point
latched transmit-failure monitor output (FAULT), photocurrent monitoring, and
bias-current monitoring to indicate faults, such as when the APC loop is unable to
maintain the average optical power.
The i7070 comes in a 4mm * 4mm 24-pin QFN package and operates over the
extended temperature range of -40°C to +85°C.
Features
฀ Single +3.3V or +5V Power Supply
฀ Automatic Average Power Control ( APC )
฀ Fully Compliant with SFP and SFF-8472 MSAs
฀ Programmable Modulation Current from 5mA to 60mA (DC-Coupled)
฀ Programmable Modulation Current from 5mA to 85mA (AC-Coupled)
฀ Programmable temperature compensation
฀ Programmable Bias Current from 1mA to 100mA
฀ Bias and modulation current monitor
฀ Edge Transition Time < 130ps
฀ 51mA Typical Power-Supply Current
฀ Multirate 155Mbps to 1.25Gbps Operation
฀ 24-Pin 4mm * 4mm QFN package