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CXA3176N Datenblatt(PDF) 8 Page - Sony Corporation

Teilenummer CXA3176N
Bauteilbeschribung  IF Amplifier for FM Receiver (AFC Supported)
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Hersteller  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA3176N Datenblatt(HTML) 8 Page - Sony Corporation

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CXA3176N
Application Notes
1) Power Supply
The CXA3176N, with built-in regulator, is designed to permit stable operation at a wide range of supply
voltage of VCC1=1.1 to 4.0 V and VCC2=2.5 to 4.0 V. Decouple the wiring to VCC (Pins 4 and 19) as close
to the pin as possible.
2) Oscillator Input
Oscillator input method
a) Using Pins 1 and 2, input a 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 24 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) 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.
1
2
3
VCC
Ceramic
filter
1
2
3
From
local signal
Ceramic
filter
Fig. 1
VCC
3
4
5
6
7
8
9
Wire as short and apart as possible
As short as possible
Fig. 2


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