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CXA3304N Scheda tecnica(PDF) 8 Page - Sony Corporation |
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CXA3304N Scheda tecnica(HTML) 8 Page - Sony Corporation |
8 / 12 page —8— CXA3304N Description of Operation 1) Power supply This IC has a built-in regulator and is designed for stable operation over a wide range of supply voltages from 2.5 to 5.5 V. Wiring to the power supply pin should be decoupled as close to the pin as possible. In addition, the Pin 9 power supply line and the power supply line connected to the comparator output pull-up resistor should be separated as necessary. The IC can also be set to sleep mode to reduce power consumption by controlling Pin 14. 2) Limiter amplifier This is a differential input type limiter amplifier. The input impedance is approximately 700 Ω. Input the IF signal via a matching circuit. 3) RSSI circuit This circuit outputs a current corresponding to the amplitude of the IF signal input to the limiter amplifier. If the IF signal is the ASK signal, demodulated output is obtained. Connect a resistor to Pin 1 to convert the voltage. Adjusting this resistance value also changes the RSSI output voltage, but the value should be set so that the output voltage is smaller than the supply voltage –1.1 V. The output current includes a component twice the IF signal frequency. Adjust the value of the Pin 1 external capacitor as necessary. Connect a resistor to Pin 6 for determining the temperature characteristics of the RSSI circuit output current. Pin 2 is the RSSI circuit buffer output. The output range is from approximately 0.2 V to the supply voltage - 1.1 V. 4) COMP1 circuit This is the comparator circuit for shaping the ASK demodulation signal waveform. The output is an open collector. Connect this circuit to the power supply, etc., via a pull-up resistor. Set the connected power supply to the Pin 9 potential or lower. Pin 14 voltage Function HI IC operation mode LOW Sleep mode |
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