LTC5543 - 2.3GHz to 4GHz High Dynamic Range Downconverting Mixer

The LTC5543 is part of a family of high dynamic range, high gain passive downconverting mixers covering the 600MHz to 4GHz frequency range. The LTC5543 is optimized for 2.3GHz to 4GHz RF applications. The LO frequency must fall within the 2.4GHz to 3.6GHz range for optimum performance. A typical application is a LTE or WiMAX receiver with a 2.3GHz to 2.7GHz RF input and high-side LO.

The LTC5543 is designed for 3.3V operation, however; the IF amplifier can be powered by 5V for the highest P1dB. An integrated SPDT LO switch with fast switching accepts two active LO signals, while providing high isolation.

The LTC5543’s high conversion gain and high dynamic range enable the use of lossy IF filters in high-selectivity receiver designs, while minimizing the total solution cost, board space and system-level variation.

  • Conversion Gain: 8.4dB at 2500MHz
  • IIP3: 24.5dBm at 2500MHz
  • Noise Figure: 10.2dB at 2500MHz
  • 17.5dB NF Under +5dBm Blocking
  • High Input P1dB
  • 3.3V Supply, 660mW Power Consumption
  • Shutdown Pin
  • 50Ω Single-Ended RF and LO Inputs
  • LO Inputs 50Ω Matched when Shutdown
  • High Isolation LO Switch
  • 0dBm LO Drive Level
  • High LO-RF and LO-IF Isolation
  • Small Solution Size
  • 20-Lead (5mm × 5mm) QFN package
Typical Application
LTC5543 Typical Application
LTC5543 Typical Application
  • Wireless Infrastructure Receivers (LTE, WiMAX, WCS)
  • Point-To-Point Microwave Links
  • High Dynamic Range Downmixer Applications
LTC5543 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC5543IUH#PBF5x5 QFN-20I$10.68$7.50
LTC5543IUH#TRPBF5x5 QFN-20I$7.55
Demo Boards
Part NumberDescriptionPrice
DC1431A-DLTC5543IUH Demo Board | Optimized for RF=2.3-4.0GHz, LO=2.4-3.6GHz.$125.00
Reliability Data
LT Journal
CAD Symbol
Related Products
LTC5543 - 2.3GHz to 4GHz High Dynamic Range Downconverting Mixer
R550 - Reliability Data
Passive Mixers Increase Gain and Decrease Noise When Compared to Active Mixers in Downconverter Applications
LTC5543 Footprints and Symbols