LT5575 - 800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator


  • Input Frequency Range: 0.8GHz to 2.7GHz*
  • 50Ω Single-Ended RF and LO Ports
  • High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz
  • High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz
  • Input P1dB: 13.2dBm at 900MHz
  • I/Q Gain Mismatch: 0.04dB Typical
  • I/Q Phase Mismatch: 0.4° Typical
  • Low Output DC Offsets
  • Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz
  • Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz
  • Very Few External Components
  • Shutdown Mode
  • 16-Lead QFN 4mm × 4mm Package with Exposed Pad

Typical Application

LT5575 Typical Application
LT5575 Typical Application


The LT5575 is an 800MHz to 2.7GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for communications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth up to 490MHz. The LT5575 incorporates balanced I and Q mixers, LO buffer amplifi ers and a precision, high frequency quadrature phase shifter. The integrated on-chip broadband transformers provide 50Ω single-ended interfaces at the RF and LO inputs. Only a few external capacitors are needed for its application in an RF receiver system.

The high linearity of the LT5575 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. Channel fi ltering can be performed directly at the outputs of the I and Q channels. These 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
LT5575EUF#PBF 4x4 QFN-16 UF E 05-08-1692 Yes
LT5575EUF#TRPBF 4x4 QFN-16 UF E 05-08-1692 Yes

LT5575 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
LT5575EUF#PBF 4x4 QFN-16 E $11.04 $7.75 Yes
LT5575EUF#TRPBF 4x4 QFN-16 E $7.80 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
DC1048A LT5575EUF | 800MHz to 2.7GHz Direct I/Q Demodulator $150.00
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Click here to view our complete list of demo boards


  • Cellular/PCS/UMTS Infrastructure
  • RFID Reader
  • High Linearity Direct Conversion I/Q Receiver

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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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