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CXA3125N 데이터시트(PDF) 8 Page - Sony Corporation |
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CXA3125N 데이터시트(HTML) 8 Page - Sony Corporation |
8 / 13 page —8— CXA3125N Description of Operation (See the Electrical Characteristics Measurement Circuit.) VHF oscillator circuit This circuit is a differential amplifier type oscillator circuit. Pin 11 is the output and Pin 9 is the input. Oscillation is performed by connecting an LC resonance circuit including a varicap to Pin 11 via coupled capacitance, inputting to Pin 9 with feedback capacitance, and applying positive feedback. Note that if the capacitance across Pins 9 and 11 is too large, positive feedback may be applied via a parasitic capacitance causing undesired stray oscillation. VHF mixer circuit The mixer circuit employs a double symmetrical mixer with little local oscillation signal leakage. The RF signal is input to Pins 6 and 7. During normal use, the RF signal is input to one pin while the other pin is connected to GND. The RF signal is converted to IF frequency by the signal supplied from the oscillator and then output to Pins 2 and 3. Pins 2 and 3 are open collectors, so power must be supplied externally. Connect to VCC through L which configures external filter or resistor. The electric potential of Pins 2 and 3 at this time must be DC 4.0 V or more. UHF oscillator circuit This oscillator circuit is designed so that two collector ground type Colpitts oscillators perform differential oscillation operation via an LC resonance circuit including a varicap. Feedback capacitance is built into IC, and an LC resonance circuit including a varicap is connected between Pins 12 and 14 via coupled capacitance. UHF mixer circuit This circuit employs a double symmetrical mixer like the VHF mixer circuit. The RF signal is input to Pins 7 and 8. There is a symmetrical input at the differential from both edges of the secondary coil of the pre-stage double-tuned circuits, or an asymmetrical input to Pin 7 with a capacitor connected at Pin 8 to GND. Otherwise, the conditions and usage are the same as those for the VHF mixer circuit. IF amplifier circuit The signals frequency converted by the mixer are output from Pins 2 and 3, and at the same time are AC coupled inside the IC and input to the IF amplifier. Single-tuned filters are connected to Pins 2 and 3 in order to improve the interference characteristics of the IF amplifier. The signal amplified by the IF amplifier is output with symmetrical or asymmetrical output format. Selecting symmetrical or asymmetrical is performed at Pin 10. Asymmetrical output when Pin 10 is for open state; symmetrical output when connected to GND. During symmetrical output, SAW filter direct connection is possible and during asymmetrical output, output stage drive capability is increased to drive 75 Ω load. During asymmetrical output, output is performed from Pin 16, and during symmetrical output, output is performed from Pins 15 and 16. The output impedance is approximately 35 Ω for symmetrical output; 30 Ω for asymmetrical output. When asymmetrical output is selected, connect Pin 10 to GND through capacitor. U/V switch circuit UHF operation is chosen by applying voltage of 3 V or more to Pin 13 VHF operation for 0 V or open. |
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