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UPC3232TB-E3 Datasheet(PDF) 5 Page - NEC |
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UPC3232TB-E3 Datasheet(HTML) 5 Page - NEC |
5 / 15 page TEST CIRCUIT VCC 1 000 pF C4 1 000 pF 39 pF C3 C6 Feed-through capacitor C5 C1 100 pF IN 3 1 4 2, 5, 6 33 pF C2 OUT GND R1 L1 1 000 pF 47 nH L2 68 nH 560 Ω l1 l2 Length of microstrip line : l1 = 2.25 mm l2 = 2.75 mm 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 Type Value R1 Chip Resistance 560 Ω L1 Chip Inductor 47 nH L2 Chip Inductor 68 nH C1 Chip Capacitor 100 pF C2 Chip Capacitor 33 pF C3, C4 Chip Capacitor 1 000 pF C5 Chip Capacitor 39 pF C6 Feed-through Capacitor 1 000 pF INDUCTOR FOR THE OUTPUT PIN The internal output transistor of this IC, to output medium power. To supply current for output transistor, connect an inductor between the VCC 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 (Refer to the following page). CAPACITORS FOR THE VCC, INPUT AND OUTPUT PINS Capacitors of 1 000 pF are recommendable as the bypass capacitor for the VCC pin and the coupling capacitors for the input and output pins. 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 Ω load. The capacitors thus perform as high pass filters, suppressing low frequencies to DC. To obtain a flat gain from 100 MHz upwards, 1 000 pF capacitors are used in the test circuit. In the case of under 10 MHz operation, increase the value of coupling capacitor such as 10 000 pF. Because the coupling capacitors are determined by equation, C = 1/(2 πRfc). Data Sheet PU10597EJ01V0DS 5 µPC3232TB |
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