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CXA1999N Arkusz danych(PDF) 10 Page - Sony Corporation |
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CXA1999N Arkusz danych(HTML) 10 Page - Sony Corporation |
10 / 19 page —10— CXA1999N Application Note 1) Power Supply The CXA1999N, with built-in regulator, is designed to permit stable operation at wide range of supply voltage from 1.1 to 4.0 V. Decouple the wiring to VCC (Pin 4) as close to the pin as possible. 2) Oscillator Input Oscillator input method a) Using Pins 1 and 2, input self-excited oscillation signal through the composition of a Colpitts type crystal oscillator circuit. b) Directly input a local oscillation signal to Pin 1. 3) Mixer The mixer is of double-balance type. Pin 20 is the input pin. Input though a suitable matching circuit. The input impedance is 2.0 k Ω. Pin 3 serves as the output pin for the mixer, and a load resistance of 1.5 k Ω is incorporated. 4) IF Filter The filter to be connected between this mixer output and the IF limiter amplifier input should have the following specifications. I/O impedance : 1.5 k Ω ±10 % Band width : Changes according to applications. 5) IF Limiter Amplifier The gain of this IF limiter amplifier is approximately 100 dB. Take notice of the following points in making connection to the IF limiter amplifier input pin (Pin 5). a) Be sure to wire to the IF limiter amplifier input (Pin 5) is as short as possible. b) As the IF limiter amplifier output appears at QUAD (Pin 8), be sure to wire to the ceramic discriminator connected to QUAD is as short as possible and reduce the interference with the mixer output and IF limiter amplifier input. 2 3 1 VCC Ceramic filter 1 2 3 From local signal Ceramic filter Fig. 1 4 5 6 7 9 3 8 VCC Shortest possible wirings which must be apart as far as possible As short as possible Fig. 2 |
Podobny numer części - CXA1999N |
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Podobny opis - CXA1999N |
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