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PDF CXA3275Q Data sheet ( Hoja de datos )
| Número de pieza | CXA3275Q | |
| Descripción | PLL/OSC/MIX IC for Digital Tuner | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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PLL/OSC/MIX IC for Digital Tuner
CXA3275Q
Description
The CXA3275Q is a monolithic tuner IC for single
conversion system digital broadcast tuners. This IC
integrates three sets of local oscillator and mixer
circuits (VHF Low Band/ VHF High Band/UHF Band),
an IF amplifier and a tuning PLL onto a single chip,
enabling further miniaturization of the tuner.
40 pin QFP (Plastic)
Features
• Balanced oscillators with low-phase noise and
excellent oscillation stability (UHF: 4 pins, VHF: 2 pins)
• High linearity mixer and IF amplifier
• IF output switchable between balanced and
unbalanced
• Low-phase noise PLL synthesizer
(3-wire bus format)
• Reference frequency programmable in 4 bits
• On-chip high voltage drive transistor for charge
pump
• On-chip 4-output band switch (PNP transistor
on/off)
• 40-pin QFP package
Applications
Digital CATV tuners
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage Vcc, PLLVcc –0.3 to +6.0 V
IFVcc
–0.3 to +6.0 V
• Storage temperature
Tstg –55 to +150 °C
• Allowable power dissipation
PD 1.58 W
(when mounted on a printed circuit board)
Operating Conditions
• Supply voltage Vcc, PLLVcc
IFVcc
• Operating temperature
Topr
4.5 to 5.5
4.5 to 5.5
–40 to +80
V
V
°C
Structure
Bipolar silicon monolithic IC
This IC has pins whose electrostatic discharge strength is weak as a high-frequency process is used for this IC.
Take care when handling the 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–
E00461-PS
1 page  
CXA3275Q
Pin
No.
Symbol
Pin voltage
[V]
26 BS1
29 BS4
ON: 4.9
OFF: 0
Equivalent circuit
Vcc
19
20k
26
29
Description
Pin 26: Band switch 1 output.
Pin 29: Band switch 4 output.
The pin corresponding to the
band selected by the data
goes High.
27 BS2
28 BS3
ON: 4.9
OFF: 0
19
27
28
30 NC
31 PLLVcc
—
—
32 CP
31
—
33 VT
—
34 XI
3.1
35 XO
3.0
36 PLLGND
—
Vcc
20k
70k
30k
Pin 27: Band switch 2 output.
Pin 28: Band switch 3 output.
The pin corresponding to the
band selected by the data
goes High.
PLLVcc
32
33
50
NC.
PLL VCC.
Charge pump output.
Connects the loop filter.
Transistor open collector
output for varicap diode drive.
Connects the loop filter.
PLLVcc
31 External reference clock input.
Connects the crystal when
34 used as a reference oscillator.
500
35
Connects the crystal when
used as a reference oscillator.
PLL GND.
–5–
5 Page 
PLL Block (cont.)
Item Symbol
Bus timing (3-wire bus)
Data setup time
tSD
Data hold time
tHD
Enable waiting time
tWE
Enable setup time
tSE
Enable hold time
tHE
Measurement conditions
CXA3275Q
Min. Typ. Max. Unit
300 ns
600 ns
300 ns
300 ns
600 ns
– 11 –
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet CXA3275Q.PDF ] | |
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