LT5517 - 40MHz to 900MHz Quadrature Demodulator

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.

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
Applications
  • Wireless Infrastructure
  • High Linearity Direct Conversion I/Q Receiver
  • High Linearity I/Q Demodulator
Packaging
LT5517 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT5517EUF#PBF4x4 QFN-16E$10.54$7.40
LT5517EUF#TRPBF4x4 QFN-16E$7.50
Demo Boards
Part NumberDescriptionPrice
DC678ALT5517EUF | 40MHz to 900MHz Direct Conversion Quadrature Demodulator$150.00
Datasheet
Reliability Data
Press Release
CAD Symbol
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LT5517 Footprints and Symbols