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UPC3225TB Fiches technique(PDF) 6 Page - California Eastern Labs |
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UPC3225TB Fiches technique(HTML) 6 Page - California Eastern Labs |
6 / 16 page TEST CIRCUIT 1 2 3 6 5 4 C1 330 pF C3 1 000 pF L1 15 nH C4 1 000 pF VCC C2 100 pF 50 OUT GND GND GND IN VCC The application circuits and their parameters are for reference only and are not intended for use in actual design-ins. COMPONENTS OF TEST CIRCUIT FOR MEASURING ELECTRICAL CHARACTERISTICS Value Maker Type code C1 330 pF Murata GMR36CH C2 100 pF Murata GMR36CH C3 1 000 pF Murata GMR39CH C4 1 000 pF Murata GMR36B L1 15 nH Susumu TFL0816 INDUCTOR FOR THE OUTPUT PIN The internal output transistor of this IC consumes 24.5 mA, to output medium power. To supply current for output transistor, connect an inductor between theVCC pin (pin 3) and output pin (pin 1). Select inductance, as the value listed above. The inductor has both DC and AC effects. In terms of DC, the inductor biases the output transistor with minimum voltage drop to output enable high level. In terms of AC, the inductor makes output-port impedance higher to get enough gain. In this case, large inductance and Q is suitable. CAPACITORS FOR THE VCC, INPUT AND OUTPUT PINS Capacitors of 1 000 pF are recommendable as the bypass capacitor for the VCC pin. Capacitors of 330 pF for the input pin and 100 pF for the output pin are recommendable as the coupling capacitors. The bypass capacitor connected to the VCC pin is used to minimize ground impedance of VCC pin. So, stable bias can be supplied against VCC fluctuation. The coupling capacitors, connected to the input and output pins, are used to cut the DC and minimize RF serial impedance. Their capacitances are therefore selected as lower impedance against a 50 load. The capacitors thus perform as high pass filters, suppressing low frequencies to DC. Data Sheet PU10500EJ01V0DS 6 UPC3225TB |
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