LT5506 - 40MHz to 500MHz Quadrature Demodulator with VGA


  • Wide Range 1.8V to 5.25V Supply
  • Frequency Range: 40MHz to 500MHz
  • –4dB to 59dB Variable Power Gain
  • THD <0.12% (–58dBc) at 800mVP-P Differential Output Level
  • 8.8MHz I/Q Lowpass Output Noise Filters
  • IF Overload Detector
  • Baseband I/Q Amplitude Imbalance: 0.2dB
  • Baseband I/Q Phase Imbalance: 0.6°
  • 6.8dB Noise Figure at Max Gain
  • Input IP3 at Low Gain: – 0.5dBm
  • Low Supply Current: 27mA
  • Low Delay Shift Over Gain Control Range: 2ps/dB
  • Outputs Biased Up While in Standby
  • 16-Lead QFN 4mm x 4mm Package with Exposed Pad

Typical Application

LT5506 Typical Application
LT5506 Typical Application


The LT5506 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA), designed for low voltage operation. It supports standards that use a linear modulation format. The chip consists of a VGA, quadrature down-converting mixers and lowpass noise filters. The LO port consists of a divide-by-two stage and LO buffers. The IC provides all building blocks for IF down-conversion to I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The VGA gain has a linear-in- dB relationship to the control input voltage. Hard-clipping amplifiers at the mixer outputs reduce the recovery time from a signal overload condition. The lowpass filters reduce the out-of-band noise and spurious frequency components. The cut-off frequency of the noise filters is approximately 8.8MHz. The external 2xLO frequency is required to be twice the IF input frequency for the mixers. The standby mode provides reduced supply current and fast transient response into the normal operating mode when the I/Q outputs are AC-coupled to a baseband chip.


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
LT5506EUF#PBF 4x4 QFN-16 UF E 05-08-1692 Yes
LT5506EUF#TRPBF 4x4 QFN-16 UF E 05-08-1692 Yes

LT5506 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
LT5506EUF#PBF 4x4 QFN-16 E $4.73 $3.35 Yes
LT5506EUF#TRPBF 4x4 QFN-16 E $3.45 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
DC468A LT5506EUF | 500MHz IF Receiver with VGA and I/Q Demodulator $125.00
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Click here to view our complete list of demo boards


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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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