MAX3945pdf (SFP+ Dual-Path Li

The MAX3945 is a +3.3V, multirate, low-power limiting
amplifier optimized for Fibre Channel and Ethernet transmission
systems at data rates up to 11.3Gbps. The highsensitivity
limiting amplifier limits the signal generated by
a transimpedance amplifier into a CML-level differential
output signal. All differential inputs and outputs (I/O) are
optimally back terminated for 50I transmission line PCB
design. The MAX3945’s dual-path limiting amplifier has
programmable filtering to optimize sensitivity for different
data rates and to suppress relaxation oscillations
that could occur in some optical systems. The MAX3945
incorporates two loss-of-signal (LOS) circuits and a programmable
time mask for the LOS output.
A 3-wire digital interface reduces the pin count and
enables control of LOS threshold, LOS polarity, LOS
mode, CML output level, input offset correction, receive
(Rx) polarity, Rx input filter, and Rx deemphasis without
the need for external components.
The MAX3945 is packaged in a 3mm x 3mm, 16-pin
TQFN package.
Applications
1x/2x/4x/8x SFF/SFP/SFP+ MSA Fibre-Channel
Optical Transceiver
10GBASE-SR/LR SFP+ Optical Transceiver
10G PON ONU