Sony CXA3225N Datasheet

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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

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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

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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