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BA1442A bảng dữ liệu(PDF) 10 Page - Rohm |
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BA1442A bảng dữ liệu(HTML) 10 Page - Rohm |
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10 / 17 page  346 Audio ICs BA1442A FSelecting of attached components and operation notes Pin 1: FM ceramic filter (CF1) The input impedance of pin 1 is 330 Ω, so it should be con- nected to a ceramic filter that has an output impedance of 330 Ω. Connect the earth point of the ceramic filter to the input side GND. In addition, the connection distance between the ceramic filter and pin 1 should be as short as possible. Pin 2: FM IF bypass This pin is used to ensure stable FM, and it is normally connected to pin 19 (Vreg). If it is not possible to achieve stable FM, ground pin 2 via a 0.01 µF capacitor. The earth point in this case will be on the GND side of the FM ce- ramic filter. Pin 3: Power supply bypass capacitors (C7 and C8) C7 should be a capacitor with good high-frequency char- acteristics. Connect it between the base of the legs of pin 3 (VCC) and pin 5 (GND). The purpose of C8 is ripple rejec- tiun, and it can be connected a little further away. Pin 4: FM quadrature detector phase-shift coil (T3) Pin 3 and 4 are connected internally by a 3.3k Ω damping resistor. The earth point for the phase-shift coil should be VCC, so ensure that it is at the same voltage as pin 3 (VCC). Pin 6: FM detector low-pass filter capacitor (C11) This capacitor smooths the 2 10.7MHz (21.4MHz) sig- nal generated by FM quadrature detection, and prevents leakage of the 10.7MHz signal. The output impedance of pin 6 (5k Ω) and C11 form a low-pass filter. Connect the earth point to a GND other than the input side GND. If you do not do this, the input carrier will return from the output, and may result in poor stability. If the capacitor is too large, poor separation will result. Pin 7: FM detector output coupling capacitor (C9) FM detector output is input to the MPX throngh C9. The input impedance of pin 7 (100k Ω) and C9 form a high- pass filter. If the value of C9 is too low, poor bass region separation will result. Pin 8: AM detector output coupling capacitor (C10) AM detector output is input to the MPX through C10. The input impedance of pin 8 (20k Ω) and C10 form a high-pass filter and improves the AM fidelity. Characteristic curves for different values of C10 are given in the graph in Fig. 3. Pin 9: AM high-cut capacitor (C12) The input impedance of pin 9 (8k Ω) and C12 form a low- pass filter. To prevent beat from occurring between carri- er leak from the detector output pin and the input signal, connect a capacitor of about 1000pF, even if not using high-cut. Connect the earth point to a GND other than the input side GND. Characteristic curves for different values of C12 are given in the graph in Fig. 4. |
Số phần tương tự - BA1442A |
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Mô tả tương tự - BA1442A |
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