LTC5549 - 2GHz to 14GHz Microwave Mixer with Integrated LO Frequency Doubler


  • Upconversion or Downconversion
  • High IIP3: +28.2dBm at 5.8GHz
    +22.8dBm at 12GHz
  • 8.0dB Conversion Loss at 5.8GHz
  • +14.3dBm Input P1dB at 5.8GHz
  • Integrated LO Buffer: 0dBm LO Drive
  • Bypassable Integrated LO Frequency Doubler
  • Low LO-RF Leakage: <–30dBm
  • 50Ω Single-Ended RF, LO and IF Ports
  • 3.3V/115mA Supply
  • Fast Turn ON/OFF for TDD Operation
  • 2mm × 3mm, 12-Lead QFN Package

Typical Application

LTC5549 Typical Application
LTC5549 Typical Application


The LTC®5549 is a general purpose passive doublebalanced mixer that can be used for upconversion or downconversion. The RF port is designed for the 2GHz to 14GHz band and the IF port is optimized for 500MHz to 6GHz operation. An integrated LO buffer amplifier supports LO frequencies from 1GHz to 12GHz, requiring only 0dBm LO power. The LTC5549 delivers high IIP3 and input P1dB with low power consumption.

An internal LO frequency doubler can be enabled by a CMOS-compatible digital control pin, allowing operation with a lower, one-half LO input frequency. This allows the mixer’s LO port to be used with existing synthesizers, such as the LTC6946 and LTC6948 family.

The LTC5549’s high level of integration minimizes the total solution cost, board space and system level variation with its 2mm × 3mm package size.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC5549IUDB#PBF 3x2 QFN-12 UDB I 05-08-1985 Yes
LTC5549IUDB#TRMPBF 3x2 QFN-12 UDB I 05-08-1985 Yes
LTC5549IUDB#TRPBF 3x2 QFN-12 UDB I 05-08-1985 Yes

LTC5549 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC5549IUDB#PBF 3x2 QFN-12 I $13.58 Yes
LTC5549IUDB#TRMPBF 3x2 QFN-12 I $13.58 $9.55 Yes
LTC5549IUDB#TRPBF 3x2 QFN-12 I $13.58 $9.50 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2310A LTC5549 Demo Board | 2GHz to 14GHz Microwave Mixer with Integrated LO Frequency Doubler $200.00
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