The MAX3945ETE+T multi rate, low-power limiting amplifier is powered by a+3.3V power supply and optimized for use in fiber channel and Ethernet transmission systems, with a data rate of up to 11.3Gbps. The high-sensitivity limiting amplifier limits the signal generated by the transimpedance amplifier to produce a CML level differential output signal. All differential inputs and outputs (I/O) are optimized for 50 Ω back terminated PCB transmission lines. The MAX3945 dual channel limiting amplifier is equipped with programmable filters that can optimize sensitivity for different data rates and suppress relaxation oscillations that may occur in the optical system. The MAX3945 integrates two loss of signal (LOS) detection circuits and a programmable time shielded LOS output.

The 3-wire digital interface reduces the number of pins and enables control of LOS threshold, LOS polarity, LOS mode, CML output level, input offset correction, receive (Rx) polarity, Rx input filter, and Rx de emphasis without the need for external devices.

The MAX3945ETE+T is packaged in a 3mm x 3mm, 16 pin TQFN package.

Key Features

130mW power consumption supports SFP+module design below 1W
Single module design compatible with 1000BASE-SX/LX and 10GBASE-SR/LR standards
Using 10.32Gbps ROSA, the optical signal detection sensitivity is -25.3dBm at 1.25Gbps
When RATE-SEL=0, 1GHz/2GHz/2.5GHz/3GHz input filters can be selected
Support SFF-8431 SFP+MSA and SFF-8472 digital diagnostics
When powered by 3.3V and providing LOS function based on RSSI monitoring, the total power consumption is 130mW
When powered by 3.3V and providing LOS function based on Rx input, the total power consumption is 154mW
4mVP-P input sensitivity at 11.3Gbps rate
RATE-SEL=1, with 4psP-P DJ at 11.3Gbps rate
RATE-SEL=1, with 4psP-P DJ at 8.5Gbps speed
RATE-SEL=0, BW1=1, BW0=1, 5psP-P DJ at 4.25Gbps rate
9.0psP-P DJ at RATE-SEL=0, BW1=0, BW0=0, 1.25Gbps rate
When RATE-SEL=1, there is a 26ps rise and fall time
When RATE-SEL=0, there is a 52ps rise and fall time
CML output has level adjustment and prohibition mode
Programmable CML output for emphasis
CML output polarity selection
LOS polarity selection
LOS output with programmable masking time
Adjustable LOS trigger/clear level
Can choose LOS based on Rx input or LOS based on RSSI monitoring
3-wire digital interface compatible with Maxim SFP+series products

application

10G PON ONU
10GBASE-SR/LR SFP+optical transceiver
1x/2x/4x/8x SFF/SFP/SFP+MSA fiber channel optical transceiver