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TA2149BFN 데이터시트(PDF) 9 Page - Toshiba Semiconductor |
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TA2149BFN 데이터시트(HTML) 9 Page - Toshiba Semiconductor |
9 / 15 page TA2149BN/BFN 2001-12-21 9 4. VCC Line This ICs have two voltage supply terminals, VCC (for AM, FM IF, MPX stage) and RF VCC (for FM RF stage). Set up the potential difference between VCC and RF VCC 0.4 V (typ.) or less, otherwise there is the case that this IC doesn’t operate normally. 5. How to control the Divider of FM OSC. Divider of FM OSC ON/OFF switching is controlled by external pull-up resistor of pin 19. In case of Divider of FM OSC is used, it is necessary to set up the value of R under 470 W (typ.). When R is over 470 W, it is feared that Divider is not operating. (At this time, buffer output frequency is equal to FM OSC frequency.) Which ever Divider of FM OSC is used or not, AM OSC buffer frequency and output level is same. Mode SW8 Output Frequency Output Level (Typ.) OPEN 1/1 FM OSC 35 mVrms FM ON 1/16 FM OSC 110 mVrms OPNE AM ON 1/1 FM OSC 75 mVrms 6. How to adjust the IF Count Output Sensitivity IF count output sensitivity can be adjusted by changing the value of external resistance at pin 17. This ICs have IF signal level detector in pin 9. When DC voltage of pin 9 is high than threshold, IF count output signal come out from the pin 17. And this threshold is controlled by value of external resistance at pin 19. SW8 AM OSC FM OSC buff buff 1/1 or 1/16 19 R buff out RF VCC External resistance of pin-17 (k 9) 40 0 45 50 55 65 60 0.5 1.5 2 3 3.5 12.5 0 50 100 150 350 200 IF sens (FM) VIF (FM) 250 300 30 35 VCC = 3 V f = 10.7 MHz Df = 75 MHz |
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