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TDA7326 데이터시트(PDF) 7 Page - STMicroelectronics |
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TDA7326 데이터시트(HTML) 7 Page - STMicroelectronics |
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7 / 16 page ![]() 3.4 REFERENCE FREQUENCY GENERATOR The crystal oscillator clock is divided by the reference frequency divider to provide the ref- erence frequency to the phase comparator. Reference frequency divider range is select- able by the programming bit ’fREF’. Available reference frequency are shown in following table. PREDIVIDER R OSC IN REGISTER PC7 .. PC0 COUNTER : C AM IN FM IN REGISTER SC5 .. SC0 PD fref fsyn D94AU102 MSB Figure 3: AM direct mode operation for SW, MW and LW Figure 4: Phase comparator AM/FM fREF fREF (kHz) 0 0 12.5 01 25 10 1 1 1 2.5 TABLE 3.4 TDA7326 7/16 |
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