Features and Benefits

  • 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

Product Details

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.


  • IEEE802.11
  • High Speed Wireless LAN
  • Wireless Local Loop

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

Design Tools


ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

Product Recommendations

LT5506 Companion Parts

Recommended ADCs

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Evaluation Boards

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.