CXA3117AN Ver la hoja de datos (PDF) - Sony Semiconductor
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CXA3117AN Datasheet PDF : 30 Pages
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CXA3117AN
Application Note
1) Power Supply
The CXA3117AN, with the built-in regulator, is designed to permit stable operation at the wide range of
supply voltage from 1.1 to 4.0V. 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. Connect the capacitors attached to the crystal and Pin 2 to VCC.
b) Directly input a local oscillation signal to Pin 1.
1
VCC
2
3
Ceramic
filter
Fig. 1
1
2
From
local signal
3
Ceramic
filter
3) Mixer
The mixer is of double-balance type. Pin 24 is the input pin. Input though a suitable matching circuit. The
input impedance is 2.0kΩ.
Pin 3 serves as the output pin for the mixer, and a load resistance of 1.5kΩ 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. Connect the ground pin of the IF filter to VCC.
I/O impedance : 1.5kΩ ±10%
Bandwidth : Changes according to applications.
5) IF Limiter Amplifier
The gain of this IF limiter amplifier is approximately 100dB. Take notice of the following points in making
connection to the IF limiter amplifier input pin (Pin 5).
a) Wiring to the IF limiter amplifier input (Pin 5) should be as short as possible.
b) As the IF limiter amplifier output appears at QUAD (Pin 8), wiring to the ceramic discriminator connected
to QUAD should be as short as possible to reduce the interference with the mixer output and IF limiter
amplifier input.
3
4
5
6
7
8
9
VCC
Wire as short and apart as possible
As short as possible
Fig. 2
–9–
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