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PDF CXA3038N Data sheet ( Hoja de datos )
| Número de pieza | CXA3038N | |
| Descripción | IQ Detection IC for Digital Satellite Broadcast Tuner | |
| Fabricantes | Sony Corporation | |
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CXA3038N
IQ Detection IC for Digital Satellite Broadcast Tuner
Description
The CXA3038N is an IC for IQ-detection of DSS,
DVB, and other digital satellite broadcast QPSK
modulation signals in the 480 MHz band. It consists
of an AGC amplifier circuit, oscillator circuit, phase
shifter circuit, and phase comparison circuit. In
addition, the chip has a PLL circuit for frequency
control and built-in control data. It realizes high-
accuracy oscillator frequencies through use of a low-
cost LC resonance circuit.
Features
• Built-in PLL for controlling oscillator frequency.
• Oscillator frequency based at 479.5 MHz is
adjustable in ±4 steps of 50 kHz using the voltage
of the control pin.
• Reference OSC allows switching to 4 MHz or 10
MHz.
• Built-in output buffer for reference OSC.
• Low-impedance IQ output.
• AGC gain variation 35 dB.
24 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage
VCC –0.3 to 5.5
• Storage temperature Tstg –55 to +150
V
°C
Operating Conditions
• Supply voltage
• Operating temperature
VCC
Topr
4.75 to 5.30 V
–25 to +75 °C
Applications
Digital satellite broadcast tuner
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
—1—
E97650A84-TE
1 page  
CXA3038N
Pin
Symbol
No.
Typical pin
voltage
18 VC 0.3 V to 5 V
Equivalent circuit
21
10k
100
18
20
21
100
19 LPF 1.8 V to 3.7 V 19
20 DGND
21 DVCC
0V
5V
20
21
Description
Voltage output for varicap diode
making up the VCO.
Phase comparison output.
This pin connects the loop filter.
PLL circuit GND.
PLL circuit VCC.
22 REFOUT
4.1 V
22
REFOSC output.
20
0.01 V when
23 LOCK unlocked; 3.2 V
when locked
21
23
200k
20
PLL lock/unlock monitor.
24 XTAL
4.4 V
21
60k
20p 20p
24 Crystal connection.
20
—5—
5 Page 
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 kΩ 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.
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
• 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.
Crystal
oscillator
4 MHz
10 MHz
Frequency dividing value
Pin 3 voltage
of the reference divider
Open
80
0.8 V or less
200
Reference frequency
50 kHz
50 kHz
—11—
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CXA3038N.PDF ] | |
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