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LA1781M Datasheet(PDF) 10 Page - Sanyo Semicon Device |
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LA1781M Datasheet(HTML) 10 Page - Sanyo Semicon Device |
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10 / 48 page  LA1781M No.6038-10/48 Continued from preceding page. Pin No. Pin function Pin description Equivalent circuit 24 32 AM/FM signal meter Dedicated FM signal meter Fixed-current drive signal meter output. In AM mode, pin 32 outputs a 1mA current. Thus the HCC circuit is turned off. 32 24 10k Ω 10k Ω VCC FM S-meter AM S-meter AM/FM SW AM/FM SW MRC Outputs a 1-mA current during AM reception 26 Stereo indicator for the SD pin The voltage V23 switches between three modes as follows. FM reception : 5V : The SD pin operates linked to the IF counter buffer. 2.5V : Forced SD mode: operates as the SD pin. 0.7V : Reception mode: stereo indicator AM reception : (two modes : 0 and 5V) 5V : Operates as the seek SD pin. 0V : Reception mode. Not used. 26 100k Ω VDD AM/FM SD Stereo indicator Seek/stop switching 27 MRC control voltage time constant The MRC detector time constant is determined by a 100 Ω resistor and C2 when discharging and by the 2 μA current and C2 when charging. 27 2 μA 100 Ω C2 VCC VCC Pin 28 28 SNC control input The sub-output is controlled by a 0 to 1V input. 28 VREF Continued on next page. |
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