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CXA3038N Arkusz danych(PDF) 11 Page - Sony Corporation

Numer części CXA3038N
Szczegółowy opis  IQ Detection IC for Digital Satellite Broadcast Tuner
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Producent  SONY [Sony Corporation]
Strona internetowa  http://www.sony.co.jp
Logo SONY - Sony Corporation

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CXA3038N
PLL circuit (when Pin 21 is connected to VCC)
• A PLL is formed by connecting the anode of the LC parallel resonance circuit varicap diode to the Pin 18
output via a high resistance of approximately 10 k
Ω and connecting a loop filter between Pin 18 and Pin 19.
• The PLL circuit consists of a main divider, reference divider, phase comparator, charge pump, and reference
oscillator.
• The frequency dividing data is included in the main divider, making external data settings unnecessary.
• The reference frequency has been designed at 50 kHz.
• Fine adjustment of the VCO frequency can be performed by changing the frequency dividing value of the
main divider through an applied voltage to Pin 12. This allows adjustment in ±4 steps at 50 kHz intervals
based at 479.5 MHz as shown in the table below.
• The reference divider has two types of frequency dividing data, 80 and 200.
• Either 4 MHz or 10 MHz can be selected for the crystal oscillator. When using the 4 MHz crystal oscillator,
opening Pin 3 will select a frequency dividing value of 80 for the reference divider, and the reference
frequency will become 50 kHz.
In the same way, when using the 10 MHz crystal oscillator, connecting Pin 3 to GND will select a frequency
dividing value of 200 for the reference divider, and the reference frequency will become 50 kHz.
This is summarized in the table below.
Pin 12 voltage [V]
0.597 VCC or more
0.517VCC to 0.595VCC
0.438VCC to 0.515VCC
0.358VCC to 0.436VCC
0.279VCC to 0.356VCC
0.199VCC to 0.277VCC
0.120VCC to 0.197VCC
0.042VCC to 0.118VCC
0 to 0.04VCC
Frequency dividing value
9594
9593
9592
9591
9590
9589
9588
9587
9586
VCO oscillation frequency [MHz]
479.70
479.65
479.60
479.55
479.50
479.45
479.40
479.35
479.30
Crystal
oscillator
4 MHz
10 MHz
Pin 3 voltage
Open
0.8 V or less
Frequency dividing value
of the reference divider
80
200
Reference frequency
50 kHz
50 kHz


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