Low-Voltage Mixer FM IF System with Filter Amplifier and Data Switch

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Block Diagram

SA639DH Block Diagram

 SA639DH Block Diagram


  • VCC = 2.7 V to 5.5 V
  • Low power consumption: 8.6 mA (typical) at 3 V
  • Wideband data output (1 MHz minimum)
  • Fast RSSI rise and fall times
  • Mixer input to >500 MHz
  • Mixer conversion power gain of 9.2 dB and noise figure of 11 dB at 110 MHz
  • XTAL oscillator effective to 150 MHz (L.C. oscillator to 1 GHz local oscillator can be injected)
  • 92 dB of IF amplifier/limiter power gain
  • 25 MHz limiter small signal bandwidth
  • Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 80 dB
  • RSSI output internal op amp
  • Post detection amplifier for filtering
  • Programmable data switch
  • Excellent sensitivity: 2.24 μV into 50 Ω matching network for 10 dB S/N (Signal-to-Noise ratio) with RF at 110 MHz and IF at 9.8 MHz
  • ESD hardened
  • Power-down mode

Target Applications

  • DECT (Digital European Cordless Telephone)
  • FSK and ASK data receivers


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