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CXA3117N Scheda tecnica(PDF) 9 Page - Sony Corporation

Il numero della parte CXA3117N
Spiegazioni elettronici  IF Amplifier for M-ary FSK Pagers
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Produttore elettronici  SONY [Sony Corporation]
Homepage  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA3117N Scheda tecnica(HTML) 9 Page - Sony Corporation

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CXA3117N
Application Note
1) Power Supply
The CXA3117N, 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.
2
3
1
VCC
Ceramic
filter
2
3
1
From
local signal
Ceramic
filter
Fig. 1
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 2.0k
Ω.
Pin 3 serves as the output pin for the mixer, and a load resistance of 1.5k
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. Connect the ground pin of the IF filter to VCC.
I/O impedance : 1.5k
Ω ±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.
VCC
Wire as short and apart as possible
As short as possible
3
4
5
6
7
8
9
Fig. 2


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