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MAX3945

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

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

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

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.

Data Sheet

Download	Rev 0	(PDF, 2.3MB)
E-Mail

An evaluation kit is available: MAX3945EVKIT

Key Features

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

Applications/Uses

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

Key Specifications:

Limiting Amplifiers

Part Number

Target Oper. Range
(Gbps)

Data Rate
(Mbps)

V_SUPPLY
(V)

I_CC
(mA)

I/O Type

Input Sens.
(mV)

LOS Sens.
(mV)

Edge Speed
(ps)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

typ

min

max

max w/pins

See Notes

MAX3945

5 to >10

1062

11300

3.3

CML

5.1

TQFN/16

9.6

$3.71 @1k

See All Limiting Amplifiers (16)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Application Circuit

Application Notes

Reference Design 4794

HFRD-49.1: Multirate, 1.0625Gbps to 10.3125Gbps, SFP+ LR Transceiver

Reliability Reports

Reliability Report:	MAX3945.pdf
Show FIT data for:

Software/Models

MAX3945 IBIS Model

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3945ETE+			Active	TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0032 (PDF) Use pkgcode/variation: T1633+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3945ETE+T			Active	TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0032 (PDF) Use pkgcode/variation: T1633+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX3945EVKIT

Evaluation Kit for the MAX3945

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