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CXA3135AN Datasheet(PDF) 9 Page - Sony Corporation |
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CXA3135AN Datasheet(HTML) 9 Page - Sony Corporation |
9 / 23 page —9— 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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