LTC5594 - 300MHz to 9GHz High Linearity I/Q Demodulator with Wideband IF Amplifier


  • True Zero IF Demodulation
  • Wideband Input Matched from 500MHz to 9GHz
  • Wide IF Bandwidth: DC to 1GHz (1dB Flatness)
  • 37dB Image Rejection, Adjustable to 60dB
  • High Total OIP3: 37dBm at 5.8GHz
  • 58dBm OIP2 at 5.8GHz, Adjustable to 65dBm
  • Max Power Conversion Gain: 9.2dB at 5.8GHz
  • Single-Ended RF Input with On-Chip Transformer
  • User Adjustable DC Offset Null
  • Serial Interface
  • IF Amplifier Gain Adjustable in Eight Steps
  • IF Amplifier Shutdown/Enable
  • Low Power Shutdown Mode
  • Operating Temperature Range (TC): –40°C to 105°C
  • 32-Lead 5mm × 5mm QFN Package

Typical Application

LTC5594 Typical Application
LTC5594 Typical Application


The LTC®5594 is a direct conversion quadrature demodulator optimized for high linearity zero-IF and low-IF receiver applications in the 300MHz to 9GHz frequency range. The very wide IF bandwidth of more than 1GHz makes the LTC5594 particularly suited for demodulation of very wideband signals, especially in 5G fronthaul/backhaul receiver applications. The outstanding dynamic range of the LTC5594 makes the device suitable for demanding infrastructure direct conversion applications. Proprietary technology inside the LTC5594 provides the capability to optimize OIP2 to 65dBm, and achieve image rejection better than 60dB. The DC offset control function allows nulling of the DC offset at the A/D converter input, thereby optimizing the dynamic range of true zero-IF receivers that use DC-coupled IF signal paths. The wideband RF and LO input ports make it possible to cover all the major wireless infrastructure frequency bands using a single device. The IF outputs of the LTC5594 are designed to interface directly with most common A/D converter input interfaces. The high OIP3 and high conversion gain of the device eliminate the need for additional amplifiers in the IF signal path.


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

Part Number Package Code Temp Package
LTC5594IUH#PBF 5x5 QFN-32 UH I 05-08-1693 Yes
LTC5594IUH#TRPBF 5x5 QFN-32 UH I 05-08-1693 Yes

LTC5594 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
LTC5594IUH#PBF 5x5 QFN-32 I $22.43 $15.70 Yes
LTC5594IUH#TRPBF 5x5 QFN-32 I $22.49 $15.76 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
DC2645A LTC5594 l 300MHz to 9GHz I/Q Demodulator with Wideband IF Amplifier $200.00
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Click here to view our complete list of demo boards


  • 5G Base Station Fronthaul/Backhaul Receivers
  • Military and Satellite Receivers
  • Point-to-Point Broadband Radios
  • High Linearity Direct Conversion I/Q SDR
  • Test Instrumentation
  • DPD Receivers

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

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