Sony CXA3225N Datasheet
—1—
E98950-TE
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.
-Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage VCC1 –0.3 to +5.5 V
• Storage temperature Tstg –55 to +150 °C
• Allowable power dissipation
PD 465 mW
(when mounted on a printed circuit board)
Operating Conditions
• Supply voltage VCC1 4.75 to 5.30 V
• Operating temperature Topr –20 to +75 °C
Description
The CXA3225N is a TV tuner monolithic IC which
integrates local oscillator and mixer circuits for VHF
band, local oscillator and mixer circuits for UHF
band, and an IF amplifier onto a single chip. This IC
adopts a 20-pin SSOP package and is suitable for
miniaturizing voltage synthesizer tuner.
Features
• Low power consumption (5 V, 46 mA typ.)
• Single 5 V power supply
• Superior cross modulation
• Balance-type UHF oscillator with good oscillation
stability (4 pins)
• IF output can be selected from symmetrical or
asymmetrical
• Double-tuned filter can be connected to MIX output
• SSOP 20-pin package
Applications
• TV tuners
• VCR tuners
• CATV tuners
Structure
Bipolar silicon monolithic IC
All Band TV Tuner IC (VHF-CATV-UHF)
20 pin SSOP (Plastic)
CXA3225N
—2—
CXA3225N
Block Diagram and Pin Configuration
11121314151617181920
1 2 3 4 5 6 7 8 9
10
IF AMP
Buffer Buffer
VHF MIX UHF MIX
V. REG
UHF OSC VHF OSC
Bias
IFIN1
IFIN2
V
CC
MIXOUT1
MIXOUT2
GND
IFSW
VHFIN
UHFIN1
UHFIN2
IFOUT1
IFOUT2
BANDSW
UOSCB2
UOSCE2
UOSCE1
UOSCB1
VOSCC
VOSCB2
VOSCB1
—3—
CXA3225N
Pin Description and Equivalent Circuit
Pin
Symbol
Typical pin
Equivalent circuit Description
No. voltage (V)
1
2
3
4
5
6
7
8
9
10
IFIN1
IFIN2
VCC
MIXOUT1
MIXOUT2
GND
IFSW
VHFIN
UHFIN1
UHFIN2
2.4
2.4
5.0
4.4 during
VHF reception
4.3 during
UHF reception
4.4 during
VHF reception
4.3 during
UHF reception
0
0.8
(when open)
2.4 during
VHF reception
2.6 during
UHF reception
2.6 during
VHF reception
2.3 during
UHF reception
2.6 during
VHF reception
2.3 during
UHF reception
IF amplifier input.
Power supply.
Mixer outputs.
These pins are output with
open collector, and they must
be connected to the power
supply via the load.
GND.
Switching of VHF input ground
and IF symmetrical/
asymmetrical output.
Asymmetrical output is selected
for open state; symmetrical
output for grounding. When
used as an asymmetrical output,
ground this pin with a capacitor.
VHF inputs.
Input format is asymmetrical
input.
UHF inputs.
Input the signal to Pins 9 and
10 symmetrically or ground Pin
10 with a capacitor and input to
Pin 9.
3
5k 5k
2
1
4 5
3
7
20k
500
3
3k 3k
7
8
VCC
IFSW
3
3k 3k
9
10
—4—
CXA3225N
Pin
Symbol
Typical pin
Equivalent circuit Description
No. voltage (V)
11
12
13
14
15
16
17
18
19
VOSCB1
VOSCB2
VOSCC
UOSCB1
UOSCE1
UOSCE2
UOSCB2
BANDSW
IFOUT2
2.1 during
VHF reception
2.2 during
UHF reception
2.1 during
VHF reception
2.2 during
UHF reception
4.2 during
VHF reception
5 during
UHF reception
2.3 during
VHF reception
2.1 during
UHF reception
1.8 during
VHF reception
1.5 during
UHF reception
1.8 during
VHF reception
1.4 during
UHF reception
2.3 during
VHF reception
2.1 during
UHF reception
—
2.8 during
symmetrical
output
4.5 during
asymmetrical
output
External resonance circuit
connection for VHF oscillators.
Pin 12 is grounded with a
capacitor.
External resonance circuit
connection for UHF oscillators.
Band switching.
UHF operation for 3.0 V or
more, and VHF operation for
0.5 V or less or open state.
IF output during symmetrical
output.
The opposite phase signal to
Pin 20 is output during
symmetrical output.
When asymmetrical output is
selected, the signal is not
output.
3
12
400
3k 3k
50
11
13
V
CC
3
14
15
16
17
3k
3k
VCC
3
18
10k
100k
VCC
3
19
15
V
CC
—5—
CXA3225N
Pin
Symbol
Typical pin
Equivalent circuit Description
No. voltage (V)
IFOUT120
2.8 during
symmetrical
output
2.8 during
asymmetrical
output
IF output.
3
15
20
V
CC
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