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BA4424 データシート(PDF) 3 Page - Rohm |
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BA4424 データシート(HTML) 3 Page - Rohm |
3 / 7 page 50 Audio ICs BA4424N FMeasurement circuit FPin connections 1 FM ANT input pin : Connect to BPF ZIN = 75 Ω 2 RF amplifier bypass pin : Connect to bypass ca- pacitor 3 RF amplifier output load pin : Connect to RF tuning circuit 4 MIX output pin : IFT or resistor load 5 GND pin : IC ground pin 6 IF amplifier output pin : ZOUT = 330 Ω 7 AFC diode pin : Cathode pin (anode pin is connected internally to ground) 8 OSC pin : Connect to resonating circuit 9 VCC pin : IC voltage supply pin FCircuit operation (1) RF amplifier circuit The RF amplifier consists of a common base transistor. A band pass filter (BPF) is used in the ANT circuit, and as the RF amplifier is base-grounded, a BPF with an out- put impedance of 75 Ω should be used. If a BPF without DC cutoff is used, a coupling capacitor will be necessary. An LC tuning circuit is connected to form the output load of the RF amplifier. A coil with tap or coil with secondary winding can be used to reduce spurious ratios such as image ratios. A coupling capacitor for the mixer circuit is included on-chip. The bypass capacitor for the RF ampli- fier should have good high frequency characteristics, and it should be connected to the input BPF ground con- nection as close as possible to Pin 5 (GND), such that the connection pattern absolutely does not allow supply cur- rent to flow from Pin 5. |
同様の部品番号 - BA4424 |
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同様の説明 - BA4424 |
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