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CXA3135AN Datasheet(PDF) 9 Page - Sony Corporation

No. de pieza CXA3135AN
Descripción Electrónicos  All Band TV Tuner IC with On-chip PLL
Download  23 Pages
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Fabricante Electrónico  SONY [Sony Corporation]
Página de inicio  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA3135AN Datasheet(HTML) 9 Page - Sony Corporation

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CXA3135AN
Description of Functions
The CXA3135AN is a terrestrial wave broadcast tuner IC which converts frequencies to IF in order to tune
and detect only the desired reception frequency of VHF, CATV and UHF band signals.
In addition to the mixer, local oscillator and IF amplifier circuits required for frequency conversion to IF, this
IC also integrates a PLL circuit for local oscillator frequency control onto a single chip.
The functions of the various circuits are described below.
1. Mixer circuit
This circuit outputs the frequency difference between the signal input to VHFIN or UHFIN and the local
oscillation signal.
2. Local oscillator circuit
A VCO is formed by externally connecting an LC resonance circuit composed of a varicap diode and
inductance.
3. IF amplifier circuit
This circuit amplifies the mixer IF output, and consists of an amplifier stage and low impedance output
stage.
4. PLL circuit
This PLL circuit fixes the local oscillator frequency to the desired frequency. It consists of a prescaler, main
divider, reference divider, phase comparator, charge pump and reference oscillator. The control format
supports the I2C bus format. The following five modes can be selected according to the combination of the
frequency division values of the main and reference dividers.
Mode
Main divider
Reference divider
B-0
15 bit
1024 fixed
B-1
14 bit
512 fixed
B-2
15 bit
640 fixed
B-3
15 bit
512 fixed
B-4
15 bit
512/1024 switching


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