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CXA3176N データシート(PDF) 11 Page - Sony Corporation |
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CXA3176N データシート(HTML) 11 Page - Sony Corporation |
11 / 21 page —11— CXA3176N 13) AFC The AFC is of the current output type which outputs the frequency deviation in the form of the current and converts it to the voltage. The output current range is approximately ±0.4 µA for the slow mode and ±70 µA for the fast mode. CXA3176N AFC Principle Diagram The Pin 7 voltage V continues to change till the Vin value reaches the Vref value. When these values are equal, the Pin 7 output current becomes “0” and the voltage is determined by the charge and time. The Pin 7 voltage V is output to Pin 6 through the amplifier. Vout=Vref+4 (V–Vref) The Vout operating range is 0.4 V to 4 (VCC–0.2) V so that AFC should be set within this range. Also, the voltage for Pin 7 is undefined with the IC itself. The AFC voltage varies, for example, as shown below by the VCO characteristics. The AFC voltage follows the VCO characteristics because this voltage is independent of the slope of the S curve. In other words, the CXA3176N operates according to the VCO characteristics when the VCO characteristics have the linearity with respect to the voltage and the VCO characteristics can be controlled within the range shown in the graph below. Vref Vref C V=it/C ×4 LPF Vref BUF 7 6 VCO RF Vin (S curve voltage) Vout (AFC voltage) External parts 1st MIX for FM receiver 1st OSC for FM receiver To CXA3176N 4 (VCC–0.2)V 0.4V fo A B C Input frequency |
同様の部品番号 - CXA3176N |
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同様の説明 - CXA3176N |
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