Moteur de recherche de fiches techniques de composants électroniques |
|
CXA3225N Fiches technique(PDF) 8 Page - Sony Corporation |
|
CXA3225N Fiches technique(HTML) 8 Page - Sony Corporation |
8 / 16 page —8— CXA3225N Description of Operation (See the Electrical Characteristics Measurement Circuit.) VHF oscillator circuit This circuit is a differential amplifier-type oscillator circuit. Pin 13 is the output, Pin 11 is the input and Pin 12 is the GND. Oscillation is performed by connecting an LC resonance circuit including a variable capacitance diode, to Pin 13 via coupled capacitance, inputting to Pin 11 with feedback capacitance, and applying positive feedback. Note that if the capacitance across Pins 11 and 13 is too large, positive feedback may be applied via a parasitic capacitance causing undesired stray oscillation. The resistor connected Pin 11 prevents the parasitic oscillation. VHF mixer circuit The mixer circuit employs a double balanced mixer with little local oscillation signal leakage. The input format is the base input type. Pin 7 is grounded and the RF signal is input to Pin 8. The RF signal is converted to IF frequency by the signal supplied from the oscillator and then output to Pins 4 and 5. Pins 4 and 5 are open collectors, so the power must be supplied externally. The electric potential of Pins 4 and 5 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 the differential oscillation operation via an LC resonance circuit including a variable capacitance diode. The resonance capacitors which configure the Colppits oscillator are connected between Pins 14 and 15, 15 and 16, 16 and 17. The LC resonance circuit including the variable capacitance diode Di is connected between Pins 14 and 17. UHF mixer circuit This circuit employs a double balanced mixer like the VHF mixer circuit. The RF signal is input to Pins 9 and 10. There are two input methods; one is the symmetrical input where the signal is input to Pins 9 and 10 differentially and the other is the asymmetrical input where Pin 9 is grounded via a capacitor and the signal is input to Pin 10. Pins 4 and 5 are the mixer outputs. Pins 4 and 5 are open collectors, so the power must be supplied externally. The electric potential of Pins 4 and 5 at this time must be DC 4.0 V or more. IF amplifier circuit The signals frequency converted by the mixer are output from Pins 4 and 5, and then they are input to the IF input Pins 1 and 2 via the external tuned circuit. As the IF tuned circuit, the single-tuned circuit shown in the Electrical Characteristics Measurement Circuit or double-tuned circuits can be connected. When used as the single-tuned filter, be sure to connect it via the capacitor so that the DC voltage may not be applied to Pins 1 and 2. The signal amplified by the IF amplifier is output with symmetrical or asymmetrical output format. Selecting symmetrical or asymmetrical is performed at Pin 7. Asymmetrical output when Pin 7 is grounded via the capacitor; symmetrical output when it is directly grounded. During symmetrical output, SAW filter direct connection is possible and during asymmetrical output. During asymmetrical output, output is performed from Pin 20, and during symmetrical output, output is performed from Pins 19 and 20. The output impedance is approximately 30 Ω. U/V switch circuit UHF operation is chosen by applying voltage of 3 V or more to Pin 18, VHF operation for 0 V or open. |
Numéro de pièce similaire - CXA3225N |
|
Description similaire - CXA3225N |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |