技术特性

• FM part
  • AGC generation by RF and IF detection
  • I/Q mixer for 1st IF 10.7 MHz with image rejection
  • Mixer for 2nd IF 450 kHz
  • Internal 450 kHz band pass filter with bandwidth control by ISS
  • Fully integrated FM demodulator with noise cancellation
• AM part
  • Wide and narrow AGC generation
  • Mixer for 1st IF 10.7 MHz, AM upconversion
  • Mixer for 2nd IF 450 kHz
  • Integrated AM-demodulator
  • AM IF noise blanking
• Stereo decoder
  • PLL with adjustment free, fully integrated VCO
  • Automatic pilot dependent MONO/STEREO switching
  • Programmable ROLL-OFF compensation
  • High cut and stereo blend-characteristics programmable
  • Dedicated RDS mute
  • Audio noise blanker
• Additional features
  • VCO for world tuning range
  • High performance fast PLL for RDSSystem
  • IF counter for FM and AM with search stop signal
  • Quality detector for level, deviation, adjacent channel and multipath
  • ISS (Intelligent selectivity system) for cancellation of adjacent channel and noise influences
  • Adjacent channel mute
  • Fully electronic alignment
  • Independend weather band input
  • All functions I²C bus controlled

功能框图