UPC2533

DATA SHEET BIPOLAR ANALOG INTEGRATED CIRCUIT µPC2533 AM TUNER FOR ELECTRONIC TUNING CAR RADIOS The µPC2533 is an IC developed as an AM tuner for car stereos and car radios. It employs an up-conversion type double super-heterodyne configuration (IF1 = 10.71 MHz, IF2 = 450 kHz). The internal configuration consists of the MIX1 block (MIX1, OSC1, Buff1), MIX2 block (MIX2, OSC2, Buff2), IF amplifier, detection circuit, AGC circuit, signal meter circuit, SD (station detector) circuit, and Lo/DX (short range/long range) circuit. Features Possible to select stations using only one varactor diode with narrow variable capacitance range Tracking adjustment unnecessary Coil switching between LW (long wave) and MW (middle wave) unnecessary Less sensitivity deviation due to tracking error High S/N: 60 dB Signal meter output with good linearity Signal meter output voltage inclination setting possible by external resistor. Can be used with IF (intermediate frequency) counter turning system or high/low tuning system. SD Sensitivity Setting Type Number IF Counter Output Set by pin No. 7 High/Low Output Set by pin No. 9 Signal Meter Voltage Inclination Setting Depends on SD sensitivity setting Remarks SD sensitivity of IF counter system and high/low system can be set independently. Tilt of the signal meter voltage can be set without regard to SD sensitivity. µPC2533GS-01 µPC2533GS-02 Set by pin No. 7 Set by pin No. 9 LO/DX function on-chip Since IFT (intermediate f...