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MAX3785
6.25Gbps, 1.8V PC Board Equalizer

Industry's Smallest Backplane Equalizer Measures Only 1.5mm x 1.5mm


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Data Sheet
FULL DATA SHEET (PDF, 364kB)
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Description
The MAX3785 6.25Gbps equalizer operates from a single 1.8V supply and compensates for transmission-medium losses encountered with FR-4 transmission lines. Optimized for low-voltage, high-density, DC-coupled interconnections between the line card and switch card, the MAX3785 enables a system upgrade path while maintaining a legacy rate of 2.5Gbps to 3.125Gbps. Roughly the size of two 0603 passive components, the MAX3785 easily provides placement and routing flexibility.

The MAX3785 is composed of an equalizer, limiting amplifier, and output driver. For data rates of 3.2Gbps and lower, the MAX3785 equalizes signals for spans up to 40in of FR-4 board material. For data rates up to 6.25Gbps, the MAX3785 compensates for 30in of FR-4 board material. The MAX3785 is coding independent, functioning equally well for 8b/10b or scrambled signals.

The MAX3785 features DC-coupled current-mode logic (CML) data inputs and outputs. It is packaged in a tiny 1.5mm x 1.5mm chip-scale package (USCP™) and a 6-pin TDFN package.

Key Features   Applications/Uses
  • Single 1.8V Supply
  • Very Low Power, 60mW
  • Spans 30in with FR-4 at 6.25Gbps
  • Operates from 1.0Gbps to 6.4Gbps
  • Coding Independent, 8b/10b or Scrambled
  • DC-Coupled CML Inputs and Outputs
  • Small 1.5mm x 1.5mm Footprint

 
  • Double IEEE 802.3ae XAUI
  • Double STM-16/OC-48
  • HSBI for ≤ 6.4Gbps

    Key Specifications:   Equalizers (Cable and Circuit Board)
    Part Number Min. Data Rate (Mbps) Max. Data Rate (Mbps) Max. Reach @ Max. Data Rate Supply Voltage (V) I/O Type Channels Per Part Typ. Rx Eq. @ Max. Rate (dB) Package Operating Temp. Range (°C)
    MAX3785  1000 6400 0.8m FR4 1.8 CML 1 15 THIN QFN (Dual)/6
    UCSP/0
    UCSP/6
    WLP/0
    -20 to +85
    0 to +85
    See All Equalizers (Cable and Circuit Board) (18)

    Diagram
    MAX3785: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  • Application Note 1900: HFTA-06.0: Designing a Simple, Small, Wide-Band and Low-Power Equalizer for FR4 Copper Links - MAX3785
  • Application Note 3455: HFTA-11.0: Spectral Content of NRZ Test Patterns - MAX3785
  • Application Note 3834: HFTA-13.0: Designing External Cabling for Low EMI Radiation - MAX3785

    Evaluation Kits
  • MAX3785EVKIT
  • MAX3785UTTEVKIT

    Design Guides
  • FIBER (PDF)

    Reliability Reports
  • Show FIT data for:
  • Reliability Report: MAX3785UTT.pdf

    Software/Models
  • MAX3785UBL IBIS Model
  • MAX3785UBL SPICE Input/Output Model
  • MAX3785UTT SPICE Input/Output Model

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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.


    Devices: 1-14 of 14

    MAX3785 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX3785ITT+  
    TDFN;6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785UTT+  
    TDFN;6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785ITT+T  
    TDFN;6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785UTT+T  
    TDFN;6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785ITT  
    THIN QFN (Dual);6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3785UTT  
    THIN QFN (Dual);6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3785ITT-T  
    THIN QFN (Dual);6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3785UTT-T  
    THIN QFN (Dual);6 pin;
    Dwg: 21-0137 (PDF)
    Use pkgcode/variation: T633-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3785UBL+  
    UCSP;6 pin;
    Dwg: 21-0093 (PDF)
    Use pkgcode/variation: B9+3*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785UBL+T  
    UCSP;6 pin;
    Dwg: 21-0093 (PDF)
    Use pkgcode/variation: B9+3*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785UBL  
    UCSP;6 pin;
    Dwg: 21-0093 (PDF)
    Use pkgcode/variation: B9-3*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3785UBL-T  
    UCSP;6 pin;
    Dwg: 21-0093 (PDF)
    Use pkgcode/variation: B9-3*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3785UWL+  
    WLP;9 pin;
    Dwg: 21-0067 (PDF)
    Use pkgcode/variation: W91B1+2*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3785UWL+T  
    WLP;9 pin;
    Dwg: 21-0067 (PDF)
    Use pkgcode/variation: W91B1+2*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Topmark Coding: MAX3785
  • New Product Press Release 2002-11-26 

    Related Products
    MAX3800 3.2Gbps Adaptive Equalizer and Cable Driver
    MAX3801 3.2Gbps Adaptive Equalizer
    MAX3980 3.125Gbps XAUI Quad Equalizer
    MAX3981 3.125Gbps XAUI Quad Cable Equalizer
    MAX3802 3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver
    MAX3784, MAX3784A 5Gbps PCB Equalizer

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    Document Ref.: 19-2630; Rev 4; 2008-10-22
    This page last modified: 2008-10-22



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