LT5502 - 400MHz Quadrature IF Demodulator with RSSI


  • Single 1.8V to 5.25V Supply
  • IF Frequency Range: 70MHz to 400MHz
  • 84dB Limiting IF Gain
  • 90dB Linear RSSI Range
  • 7.7MHz Lowpass Output Filter
  • Baseband I/Q Amplitude Imbalance: <0.7dB
  • 4dB Noise Figure
  • Low Supply Current: 25mA
  • Outputs Biased Up While in Standby
  • Shutdown Current: 1mA
  • 24-Lead Narrow SSOP Package

Typical Application

LT5502 Typical Application
LT5502 Typical Application


The LT®5502 is a 70MHz to 400MHz monolithic integrated quadrature IF demodulator. It consists of an IF limiter, quadrature down mixers, integrated lowpass filters, and divide-by-two LO buffers. The demodulator provides all building blocks for demodulation of I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The IF limiter has 84dB small-signal gain, and a built-in receive signal strength indicator (RSSI) with over 90dB linear range. The input referred noise-spectral-density is 1.45nV/√Hz, which is equivalent to a 4dB noise figure when the input is terminated with a 50Ω source. The integrated lowpass output filters act as antialiasing and pulse-shaping filters for demodulated I/Q-baseband signals. The 3dB cutoff frequency of the filters is about 7.7MHz. The VCO frequency is required to be twice the desired operating frequency to provide quadrature local oscillator (LO) signals to the mixers. The standby mode provides fast transient response to the receive mode with reduced supply current 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
LT5502EGN#PBF SSOP-24 GN E 05-08-1641 (GN24) Yes
LT5502EGN#TRPBF SSOP-24 GN E 05-08-1641 (GN24) Yes

LT5502 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
LT5502EGN#PBF SSOP-24 E $6.21 $5.25 Yes
LT5502EGN#TRPBF SSOP-24 E $5.35 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
DC333A-A LT5502EGN | 400MHz IF Receiver with Limiting Amp. and I/Q Demodulator (with IF I Contact Factory
DC333A-B LT5502EGN | 400MHz IF Receiver with Limiting Amp. and I/Q Demodulator (with Resi Contact Factory
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Click here to view our complete list of demo boards


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Design Tools

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