MAX3945

NOT RECOMMENDED FOR NEW DESIGNS

1.0625Gbps to 11.3Gbps, SFP+ Dual-Path Limiting Amplifier

1Gbps to 11Gbps Limiting Amp Enables < 1W SFP+ Optical Transceiver Modules

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.76

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Overview

130mW Power Dissipation Enables < 1W SFP+ Modules
Enables Single-Module Design Compliance with 1000BASE-SX/LX and 10GBASE-SR/LR Specifications
-25.3dBm Optical Sensitivity at 1.25Gbps Using a 10.32Gbps ROSA
Selectable 1GHz/2.1GHz/2.5GHz/3GHz Input Filters at RATE_SEL = 0 Setting
Supports SFF-8431 SFP+ MSA and SFF-8472 Digital Diagnostic
Total Power Dissipation of 130mW at 3.3V Power Supply with RSSI Monitor-Based LOS
Total Power Dissipation of 154mW at 3.3V Power Supply with Rx Input-Based LOS
4mV_P-P Input Sensitivity at 11.3Gbps
4ps_P-P DJ at 11.3Gbps with RATE_SEL = 1
4ps_P-P DJ at 8.5Gbps with RATE_SEL = 1

5ps_P-P DJ at 4.25Gbps with RATE_SEL = 0, BW1 = 1, BW0 = 1
9.0ps_P-P DJ at 1.25Gbps with RATE_SEL = 0, BW1 = 0, BW0 = 0
26ps Rise and Fall Time with RATE_SEL = 1
52ps Rise and Fall Time with RATE_SEL = 0
CML Output with Level Adjustment and Squelch Mode
Programmable CML Output Deemphasis
CML Output Polarity Select
LOS Polarity Select
Programmable Masking Time for the LOS Output
LOS Assert/Deassert Level Adjustment
Choice of Rx Input-Based LOS or RSSI Monitor-Based LOS
3-Wire Digital Interface Compatible with Maxim’s SFP+ Family of Products

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 high-sensitivity 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 50Ω 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

10G PON ONU
10GBASE-SR/LR SFP+ Optical Transceiver
1x/2x/4x/8x SFF/SFP/SFP+ MSA Fibre-Channel Optical Transceiver

Part Models: 2
1ku List Price: Starting From $4.76

Documentation

Data Sheet 1

MAX3945: 1.0625Gbps to 11.3Gbps, SFP+ Dual-Path Limiting Amplifier Data Sheet (Rev.0) 03/09/2010

Reliability Data 1

MAX3945 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX3945ETE+	16-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX3945ETE+T	16-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 27, 2024 - 2400 ASSEMBLY
		pcn_2400
MAX3945ETE+	PRODUCTION
MAX3945ETE+T
Aug 14, 2023 - 2275A WAFER FAB
		pcn_2275a
MAX3945ETE+	PRODUCTION
MAX3945ETE+T
Dec 13, 2013 - 1355 MECHANICAL DATASHEET
		pcn_1355
MAX3945ETE+	PRODUCTION
MAX3945ETE+T

This is the most up-to-date revision of the Data Sheet.

Tools & Simulations

Software Development 1

MAX3945EVKIT Software, 1.0.0

IBIS Model 1

MAX3945 IBIS Model

Evaluation Kits

Evaluation Kit for the MAX3945

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Features and Benefits

Fully Assembled and Tested
Software Control Through USB Port
SMA Connectors for High-Speed Inputs and Output

Product Details

The MAX3945 evaluation kit (EV kit) is an assembled electrical demonstration board that provides easy computer-controlled evaluation of the MAX3945 multirate limiting amplifier. The included software communicates with the EV kit through the USB port, and provides access to all the internal registers to optimize the functionality of the MAX3945. The EV kit is powered by a +3.3V supply and USB port. SMA connectors are used for the high-speed inputs and outputs. An LED indicates the status of USB power.