LT5517 - 40MHz to 900MHz Quadrature Demodulator

Features

  • RF Input Frequency Range: 40MHz to 900MHz
  • High IIP3: 21dBm at 800MHz
  • High IIP2: 58dBm at 800MHz
  • I/Q Gain Mismatch: 0.3dB Max
  • I/Q Phase Mismatch: 0.7°
  • Noise Figure: 12.4dB at 800MHz
  • Conversion Gain: 3.3dB at 800MHz
  • Baseband Bandwidth: 130MHz
  • Single Ended, 50 Ohm Matched 2XLO Input
  • Shutdown Mode
  • 16-Lead QFN (4mm x 4mm) Package with Exposed Pad

Typical Application

LT5517 Typical Application
LT5517 Typical Application

Description

The LT®5517 is a 40MHz to 900MHz quadrature demodulator optimized for high linearity receiver applications where high dynamic range is important. It is suitable for communications receivers where an RF or IF signal is directly converted into I and Q baseband signals with a bandwidth up to 130MHz. The LT5517 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, broadband quadrature generator derived from an on-chip divide-by-two circuit.

The superior linearity and low noise performance of the LT5517 is achieved across its full frequency range. A well-balanced divide-by-two circuit generates precision quadrature LO carriers to drive the I mixer and the Q mixer. Consequently, the outputs of the I-channel and the Q-channel are well matched in amplitude, and their phases are 90° apart. The LT5517 also provides excellent 50 Ohm impedance matching at the 2XLO port across its entire frequency range.

Packaging

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
Drawing
RoHS
LT5517EUF#PBF 4x4 QFN-16 UF E 05-08-1692 Yes
LT5517EUF#TRPBF 4x4 QFN-16 UF E 05-08-1692 Yes


LT5517 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
(1-99)
Price
(1k)*
RoHS
LT5517EUF#PBF 4x4 QFN-16 E $10.54 $7.40 Yes
LT5517EUF#TRPBF 4x4 QFN-16 E $7.50 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
DC678A LT5517EUF | 40MHz to 900MHz Direct Conversion Quadrature Demodulator $150.00
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Click here to view our complete list of demo boards

Applications

  • Wireless Infrastructure
  • High Linearity Direct Conversion I/Q Receiver
  • High Linearity I/Q Demodulator

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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
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support