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MAX2645
3.4GHz to 3.8GHz SiGe Low-Noise Amplifier/PA Predriver


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Data Sheet
FULL DATA SHEET (PDF, 304kB)
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Description
The MAX2645 is a versatile, high-linearity, low-noise amplifier designed for 3.4GHz to 3.8GHz wireless local loop (WLL), wireless broadband access, and digital microwave radio applications. The device features an externally adjustable bias control, set with a single resistor, that allows the user to meet minimum linearity requirements while minimizing current consumption. The amplifier's high-gain, low-noise performance and adjustable input third-order intercept (IP3) allow it to be used as a low-noise amplifier (LNA) in the receive path, a PA predriver in the transmit path, or as an LO buffer.

The MAX2645 features a logic-level gain control that provides a 25dB step reduction in gain, which improves IP3 performance for operation during high input signal level conditions. Supply current is reduced from 9mA in high-gain mode to 3mA in low-gain mode. The device also includes a logic-controlled shutdown mode, which reduces supply current to 0.1µA. The MAX2645 operates from a +3V to +5.5V supply and is offered in the miniature 10-pin µMAX package (5mm x 3mm) with an exposed paddle. Its performance has been optimized for use with the MAX2683/MAX2684 3.5GHz SiGe mixers to provide a complete high-performance, front-end solution for 3.5GHz applications.

Key Features   Applications/Uses
  • 3.4GHz to 3.8GHz Frequency Range
  • LNA Performance (High/Low-Gain Modes)
    • Gain: +14.4dB/-9.7dB
    • NF: 2.3dB/15.5dB
    • Input IP3: +4dBm/+13dBm
    • Supply Current: 9.2mA/2.7mA
  • Highly Versatile Application
    • Receive Path 1st and 2nd Stage LNA
    • Transmit PA Predriver
    • LO Buffer
  • Adjustable IP3 and Supply Current
  • 0.1micro;A Supply Current in Shutdown Mode
  • +3.0V to +5.5V Single-Supply Operation
  • 10-Pin µMAX-EP Package (5.0mm x 3.0mm)

 
  • Digital Microwave Radios
  • Wireless Broadband Access
  • Wireless Local Loop (WLL)

    Key Specifications:   Low-Noise Amplifiers
    Part Number Solutions Applications Frequency Range (MHz) Noise Figure (dB) Gain (dB) Input IP3 (dBm) Supply Current (mA) Footprint (mm x mm) RoHS Available Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX2645  WLL
    WLL
    3400 to 3800 HG: 2.3
    LG: 15.5
    -9.7
    14.4
    13 2.7
    9.2
    3.0 x 4.9 Yes uMAX/10 26 $1.25 @ 1k
    See All Low-Noise Amplifiers (18)
    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
    MAX2645: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • Application Note 697: Silicon Germanium (SiGe) Technology Enhances Radio Front-End Performance - MAX2645
  • Application Note 742: Impedance Matching and the Smith Chart: The Fundamentals - MAX2645
  • Application Note 806: RF ICs for 3.5GHz WLL Transceivers - MAX2645
  • Application Note 2874: 2.5GHz LNA with Gain Step for 802.11b/g and Bluetooth Applications - MAX2645
  • Application Note 2875: Three Methods of Noise Figure Measurement - MAX2645
  • Application Note 3041: LNA for W-CDMA (UMTS) Features Gain Step - max2645
  • Application Note 3042: LNA for MMDS Band (2.65GHz) Features Gain Step - MAX2645
  • Application Note 4231: CMOS Source Resistance and Its Effects on Source-Follower Gain - MAX2645

    Evaluation Kits
  • MAX2645EVKIT

    Design Guides
  • WIRELESS (PDF)

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:

    Software/Models
    none

    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: 1-4 of 4

    MAX2645 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX2645EUB+  
    uMAX;10 pin;26 mm²
    Dwg: 21-0109D (PDF)
    Use pkgcode/variation: U10E+3*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX2645EUB+T  
    uMAX;10 pin;26 mm²
    Dwg: 21-0109D (PDF)
    Use pkgcode/variation: U10E+3*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX2645EUB  
    uMAX;10 pin;26 mm²
    Dwg: 21-0109D (PDF)
    Use pkgcode/variation: U10E-3*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX2645EUB-T  
    uMAX;10 pin;26 mm²
    Dwg: 21-0109D (PDF)
    Use pkgcode/variation: U10E-3*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
  • Topmark Coding: MAX2645
  • New Product Press Release 2000-08-04 

    Related Products
    MAX2683, MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler

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    Document Ref.: 19-1759; Rev 1; 2003-10-23
    This page last modified: 2007-07-23




             


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