LTC5585 - Wideband IQ Demodulator with IIP2 and DC Offset Control


  • 400MHz to 4GHz Operating Frequency
  • High IIP3: 28.7dBm at 700MHz, 25.7dBm at 1.95GHz
  • High IIP2: 70dBm at 700MHz, 60dBm at 1.95GHz
  • User Adjustable IIP2 Up to 80dBm
  • User Adjustable DC Offset Null
  • High Input P1dB: 16dBm at 1950MHz
  • I/Q Bandwidth of 530MHz or Higher
  • Image Rejection: 43dB at 1950MHz
  • Noise Figure: 13.5dB at 700MHz 
    12.7dB at 1.95GHz
  • Conversion Gain: 2.0dB at 700MHz 
    2.4dB at 1.95GHz
  • Single-Ended RF with On-Chip Transformer
  • Shutdown Mode
  • Operating Temperature Range (TC): –40°C to 105°C
  • 24-Lead 4mm × 4mm QFN Package

Typical Application

LTC5585 Typical Application
LTC5585 Typical Application


The LTC®5585 is a direct conversion quadrature demodulator optimized for high linearity receiver applications in the 400MHz to 4GHz frequency range. It is suitable for communications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth of 530MHz or higher. The LTC5585 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, high frequency quadrature phase shifter. The integrated on-chip broadband transformer provides a single-ended interface at the RF input with simple off-chip L-C matching. In addition, the LTC5585 provides four analog control voltage interface pins for IIP2 and DC offset correction, greatly simplifying system calibration.

The high linearity of the LTC5585 provides excellent spurfree dynamic range for the receiver. This direct conversion demodulator can eliminate the need for intermediate frequency (IF) signal processing, as well as the corresponding requirements for image filtering and IF filtering. These I/Q outputs can interface directly to channel-select filters (LPFs) or to baseband amplifiers.


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
LTC5585IUF#PBF 4x4 QFN-24 UF I 05-08-1697 Yes
LTC5585IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 Yes

LTC5585 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
LTC5585IUF#PBF 4x4 QFN-24 I $8.54 $5.98 Yes
LTC5585IUF#TRPBF 4x4 QFN-24 I $6.04 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
DC1662A LTC5585 Demo | Wideband I/Q Demodulator with IIP2 and DC Offset Control $150.00
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Click here to view our complete list of demo boards


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  • High Linearity Direct Conversion I/Q Receivers
  • Image Rejection 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:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
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