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

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

Product Details

Key Features

Applications/Uses

Parametric specs for Limiting Amplifiers
Target Oper. Range (Gbps) 5 to >10
Data Rate (Mbps) (min) 1062
Data Rate (Mbps) (max) 11300
VSUPPLY (V) 3.3
ICC (mA) (typ) 39
I/O Type CML
Input Sens. (mV) 4
LOS Sens. (mV) (min) 5.1
Edge Speed (ps) (max) 35
Package/Pins TQFN/16
Budgetary
Price (See Notes)
4.2
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Simplified Block Diagram

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Parameters

Parametric specs for Limiting Amplifiers
Target Oper. Range (Gbps) 5 to >10
Data Rate (Mbps) (min) 1062
Data Rate (Mbps) (max) 11300
VSUPPLY (V) 3.3
ICC (mA) (typ) 39
I/O Type CML
Input Sens. (mV) 4
LOS Sens. (mV) (min) 5.1
Edge Speed (ps) (max) 35
Package/Pins TQFN/16
Budgetary
Price (See Notes)
4.2

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
  • 4mVP-P Input Sensitivity at 11.3Gbps
  • 4psP-P DJ at 11.3Gbps with RATE_SEL = 1
  • 4psP-P DJ at 8.5Gbps with RATE_SEL = 1
  • 5psP-P DJ at 4.25Gbps with RATE_SEL = 0, BW1 = 1, BW0 = 1
  • 9.0psP-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

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.

Simplified Block Diagram

MAX3945: Typical Application Circuit MAX3945: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .