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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7540N датащи(PDF) 73 Page - STMicroelectronics |
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TDA7540N датащи(HTML) 73 Page - STMicroelectronics |
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73 / 76 page  TDA7540N Application notes 73/76 9 Application notes Following items are important to get highest performance of TDA7540N in application: 1. In order to avoid leakage current from PLL loop filter input to ground a guardring is recommended around loop filter PIN’s with PLL reference (VREF2) voltage potential. 2. Distance between Xtal and VCO input PIN 18 should be far as possible and Xtal package should get a shield versus ground. 3. Blocking of VCO supply should be near at PIN 20 and PIN 21. 4. Blocking of VCC2 supply should be near at PIN 64 and PIN 61. 5. Wire lenght to FM mixer1-input and -output should be symetrically and short. 6. FM demodulator capacitance at PIN 56 should be sense connected as short as possible versus demodulator ground at PIN 57. 7. Wire lenght from AM mixer tank output to 9KHz ceramic filter input has to be short as possible. 8. To minimize “AM TWEET” the AM demodulator capacitor should be connected versus GNDVCC1 at PIN 41 and FSU output at PIN 22 should be filtered with capacitor of about 2,2nF versus GNDVCC2. |
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