--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
V
CC
1
0.3 to +5.5
V
Storage temperature
Tstg
55 to +150
C
Allowable power dissipation
P
D
465
mW
(when mounted on a printed circuit board)
Operating Conditions
Supply voltage
V
CC
1
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
11
12
13
14
15
16
17
18
19
20
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
I
F
I
N
1
I
F
I
N
2
V
C
C
M
I
X
O
U
T
1
M
I
X
O
U
T
2
G
N
D
I
F
S
W
V
H
F
I
N
U
H
F
I
N
1
U
H
F
I
N
2
I
F
O
U
T
1
I
F
O
U
T
2
B
A
N
D
S
W
U
O
S
C
B
2
U
O
S
C
E
2
U
O
S
C
E
1
U
O
S
C
B
1
V
O
S
C
C
V
O
S
C
B
2
V
O
S
C
B
1
--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
V
CC
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
V
CC
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
V
CC
3
18
10k
100k
V
CC
3
19
15
V
CC
--5--
CXA3225N
Pin
Symbol
Typical pin
Equivalent circuit
Description
No.
voltage (V)
IFOUT1
20
2.8 during
symmetrical
output
2.8 during
asymmetrical
output
IF output.
3
15
20
V
CC
--6--
CXA3225N
Electrical Characteristics
See the Electrical Characteristics Measurement Circuit
(Ta=25 C, V
CC
=5 V)
Item
Circuit current
Conversion gain
1
Noise figure
1
,
2
1 % cross
modulation
1
3
Maximum
output power
Switch ON drift
Symbol
I
CC
VU
I
CC
VB
I
CC
UU
I
CC
UB
CG1U
CG2U
CG3U
CG4U
CG1B
4
CG2B
4
CG3B
4
CG4B
4
NF1
NF2
NF3
NF4
CM1
CM2
CM3
CM4
Pomax
(sat)
fsw1
fsw2
fsw3
fsw4
Measurement conditions
VHF operation
asymmetrical output no input signal
VHF operation
symmetrical output
no input signal
UHF operation
asymmetrical output no input signal
UHF operation
symmetrical output
no input signal
VHF operation f
RF
=50 MHz
asymmetrical output
VHF operation f
RF
=430 MHz asymmetrical output
UHF operation f
RF
=430 MHz asymmetrical output
UHF operation f
RF
=850 MHz asymmetrical output
VHF operation f
RF
=50 MHz
symmetrical output
VHF operation f
RF
=430 MHz symmetrical output
UHF operation f
RF
=430 MHz symmetrical output
UHF operation f
RF
=850 MHz symmetrical output
VHF operation f
RF
=50 MHz
asymmetrical output
VHF operation f
RF
=430 MHz asymmetrical output
UHF operation f
RF
=430 MHz asymmetrical output
UHF operation f
RF
=850 MHz asymmetrical output
VHF operation
f
D
=50 MHz
f
UD
=12 MHz
asymmetrical output
VHF operation
f
D
=430 MHz f
UD
=12 MHz
asymmetrical output
UHF operation
f
D
=430 MHz f
UD
=12 MHz
asymmetrical output
UHF operation
f
D
=850 MHz f
UD
=12 MHz
asymmetrical output
50
load, asymmetrical output
VHF operation
f
OSC
=100 MHz
f from 3 seconds to 3 minutes after switch ON
VHF operation
f
OSC
=470 MHz
f from 3 seconds to 3 minutes after switch ON
UHF operation
f
OSC
=470 MHz
f from 3 seconds to 3 minutes after switch ON
UHF operation
f
OSC
=895 MHz
f from 3 seconds to 3 minutes after switch ON
Min.
Typ.
Max.
Unit
35
46
55
mA
47
58
67
mA
39
50
59
mA
51
62
71
mA
20
23
26
dB
20
23
26
dB
23
26
29
dB
23
26
29
dB
29
32
35
dB
29
32
35
dB
32
35
38
dB
32
35
38
dB
12
16
dB
13
17
dB
10
13
dB
12
15
dB
99
103
dB
96
100
dB
96
100
dB
95
99
dB
7
10
dBm
300
kHz
600
kHz
350
kHz
350
kHz
1
Value measured with untuned input.
2
NF meter direct-reading value (DSB measurement).
3
Value with a desired reception signal input level of 30 dBm, an interference signal of 100 kHz/30 % AM,
and an interference signal level where S/I=46 dB measured with a spectrum analyzer.
4
Value which is measured as 420
load impedance and compensated loss by 180
resistor connected to
Pins 19 and 20.
--7--
CXA3225N
Item
Supply voltage
drift
Band switching
voltage
Symbol
fst1
fst2
fst3
fst4
V
SW
V
V
SW
U
Measurement conditions
VHF operation
f
OSC
=100 MHz
f when V
CC
5 V 5 % variation
VHF operation
f
OSC
=470 MHz
f when V
CC
5 V 5 % variation
UHF operation
f
OSC
=470 MHz
f when V
CC
5 V 5 % variation
UHF operation
f
OSC
=895 MHz
f when V
CC
5 V 5 % variation
VHF operation
UHF operation
Min.
Typ.
Max.
Unit
200
kHz
250
kHz
150
kHz
150
kHz
0
0.5
V
3
5.5
V
--8--
CXA3225N
Description of Operation
(See the Electrical Characteristics Measurement Circuit.)
VHF oscillator circuit
This circuit is a differential amplifier-type oscillator circuit. Pin 13 is the output, Pin 11 is the input and Pin 12
is the GND.
Oscillation is performed by connecting an LC resonance circuit including a variable capacitance diode, to Pin
13 via coupled capacitance, inputting to Pin 11 with feedback capacitance, and applying positive feedback.
Note that if the capacitance across Pins 11 and 13 is too large, positive feedback may be applied via a
parasitic capacitance causing undesired stray oscillation. The resistor connected Pin 11 prevents the
parasitic oscillation.
VHF mixer circuit
The mixer circuit employs a double balanced mixer with little local oscillation signal leakage. The input
format is the base input type. Pin 7 is grounded and the RF signal is input to Pin 8. The RF signal is
converted to IF frequency by the signal supplied from the oscillator and then output to Pins 4 and 5. Pins 4
and 5 are open collectors, so the power must be supplied externally. The electric potential of Pins 4 and 5 at
this time must be DC 4.0 V or more.
UHF oscillator circuit
This oscillator circuit is designed so that two collector ground type Colpitts oscillators perform the differential
oscillation operation via an LC resonance circuit including a variable capacitance diode. The resonance
capacitors which configure the Colppits oscillator are connected between Pins 14 and 15, 15 and 16, 16 and 17.
The LC resonance circuit including the variable capacitance diode Di is connected between Pins 14 and 17.
UHF mixer circuit
This circuit employs a double balanced mixer like the VHF mixer circuit. The RF signal is input to Pins 9 and
10. There are two input methods; one is the symmetrical input where the signal is input to Pins 9 and 10
differentially and the other is the asymmetrical input where Pin 9 is grounded via a capacitor and the signal is
input to Pin 10.
Pins 4 and 5 are the mixer outputs. Pins 4 and 5 are open collectors, so the power must be supplied
externally. The electric potential of Pins 4 and 5 at this time must be DC 4.0 V or more.
IF amplifier circuit
The signals frequency converted by the mixer are output from Pins 4 and 5, and then they are input to the IF
input Pins 1 and 2 via the external tuned circuit. As the IF tuned circuit, the single-tuned circuit shown in the
Electrical Characteristics Measurement Circuit or double-tuned circuits can be connected. When used as the
single-tuned filter, be sure to connect it via the capacitor so that the DC voltage may not be applied to Pins 1
and 2.
The signal amplified by the IF amplifier is output with symmetrical or asymmetrical output format. Selecting
symmetrical or asymmetrical is performed at Pin 7. Asymmetrical output when Pin 7 is grounded via the
capacitor; symmetrical output when it is directly grounded. During symmetrical output, SAW filter direct
connection is possible and during asymmetrical output. During asymmetrical output, output is performed
from Pin 20, and during symmetrical output, output is performed from Pins 19 and 20. The output impedance
is approximately 30
.
U/V switch circuit
UHF operation is chosen by applying voltage of 3 V or more to Pin 18, VHF operation for 0 V or open.
--9--
CXA3225N
Notes on Operation
1. Care should be taken for grounding, etc. when placing external parts as the operating frequencies are
high.
2. Be sure to design the printed circuit board considering the radiation of heat by placing the GND pattern at
the bottom of the IC.
3. Care should also be taken to prevent electrostatic damage because of using high frequency process.
--10--
CXA3225N
54
52
50
48
46
44
42
40
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
Supply voltage vs. Circuit current (asymmetrical output)
V
CC
-Supply voltage [V]
I
C
C
-
C
i
r
c
u
i
t
c
u
r
r
e
n
t
[
m
A
]
UHF
VHF
68
70
66
64
62
60
58
56
54
52
50
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
Supply voltage vs. Circuit current (symmetrical output)
V
CC
-Supply voltage [V]
I
C
C
-
C
i
r
c
u
i
t
c
u
r
r
e
n
t
[
m
A
]
UHF
VHF
40
30
20
10
0
0
100 200 300 400 500 600 700 800 900 1000
Reception frequency vs. Conversion gain (asymmetrical output)
Reception frequency [MHz]
C
G
-
C
o
n
v
e
r
s
i
o
n
g
a
i
n
[
d
B
]
UHF
120
140
100
80
60
40
20
0
0
100 200 300 400 500 600 700 800 900
Reception frequency vs. Next adjacent cross modulation
(untuned input, asymmetrical output)
Reception frequency [MHz]
C
M
-
C
r
o
s
s
m
o
d
u
l
a
t
i
o
n
[
d
B
]
f
IF
=38MHz
VHF (Low)
VHF (High)
f
IF
=38MHz
f
UD
=f
D
+12MHz
f
UD
=f
D
12MHz
(100kHz, 30% AM)
Example of Representative Characteristics
--11--
CXA3225N
20
15
10
5
0
0
100 200 300 400 500 600 700 800 900
Reception frequency vs. Noise figure
(untuned input, asymmetrical output, DSB display)
Reception frequency [MHz]
N
F
-
N
o
i
s
e
f
i
g
u
r
e
[
d
B
m
]
20
0
20
40
60
60
40
20
0
I/O characteristics (untuned input, asymmetrical output)
RF input level [dBm]
I
F
o
u
t
p
u
t
l
e
v
e
l
[
d
B
m
]
40
20
0
20
40
60
40
20
0
I/O characteristics (untuned input, symmetrical output)
RF input level [dBm]
I
F
o
u
t
p
u
t
l
e
v
e
l
[
d
B
m
]
UHF
300
400
200
100
0
100
200
300
400
0
100 200 300 400 500 600 700 800 900
Supply voltage fluctuation of oscillation frequency
Oscillation frequency [MHz]
+
B
d
r
i
f
t
[
k
H
z
]
f
IF
=38MHz
VHF (Low)
VHF (High)
V
CC
+5%
V
CC
5%
(V
CC
=5V)
f
RF
=100MHz (VHF)
f
RF
=500MHz (UHF)
f
IF
is both f=38MHz
f
RF
=100MHz (VHF)
f
RF
=500MHz (UHF)
f
IF
is both f=38MHz
VHF (Low) VHF (High)
UHF
--12--
CXA3225N
Electrical Characteristics Measurement Circuit (asymmetrical output)
11
12
13
14
15
16
17
18
19
20
I
F
I
N
1
I
F
I
N
2
V
C
C
M
I
X
O
U
T
1
M
I
X
O
U
T
2
G
N
D
I
F
S
W
V
H
F
I
N
U
H
F
I
N
1
U
H
F
I
N
2
I
F
O
U
T
1
I
F
O
U
T
2
B
A
N
D
S
W
U
O
S
C
B
2
U
O
S
C
E
2
U
O
S
C
E
1
U
O
S
C
B
1
V
O
S
C
C
V
O
S
C
B
2
V
O
S
C
B
1
CXA3225N
1n
IF OUT
10k
+5V
U/VSW
ON : UHF
OFF : VHF
VT
16p
3p
6p
12p (RH)
1T363
47k
47k
47k
47k
47k
100p
100p
2
1.5t
3.3
33p
12p
15p
1T362
1T362
1T363
47k
100
20p
1n
1k
47k
51
BVL
47k
1n
1n
51
BVH
3.2
6.5t
3
1.5t
0.5p (UK)
0.5p (UK)
680p
12p
12p
1n
1n
1n
VHF IN
1n
UHF IN
1
2
3
4
5
6
7
8
9
10
3.3
1n
+5V
1n
100
2k
5.5t
5.5t
56p 56p
--13--
CXA3225N
Electrical Characteristics Measurement Circuit (symmetrical output)
11
12
13
14
15
16
17
18
19
20
I
F
I
N
1
I
F
I
N
2
V
C
C
M
I
X
O
U
T
1
M
I
X
O
U
T
2
G
N
D
I
F
S
W
V
H
F
I
N
U
H
F
I
N
1
U
H
F
I
N
2
I
F
O
U
T
1
I
F
O
U
T
2
B
A
N
D
S
W
U
O
S
C
B
2
U
O
S
C
E
2
U
O
S
C
E
1
U
O
S
C
B
1
V
O
S
C
C
V
O
S
C
B
2
V
O
S
C
B
1
CXA3225N
1n
1n
IF OUT
10k
+5V
U/VSW
ON : UHF
OFF : VHF
VT
16p
3p
6p
12p (RH)
1T363
47k
47k
47k
47k
47k
100p
100p
2
1.5t
3.3
33p
12p
15p
1T362
1T362
1T363
47k
100
20p
1n
1k
47k
51
BVL
47k
1n
1n
51
BVH
3.2
6.5t
3
1.5t
0.5p (UK)
0.5p (UK)
680p
12p
12p
1n
1n
1n
1n
VHF IN
1n
UHF IN
1
2
3
4
5
6
7
8
9
10
3.3
1n
+5V
1n
100
2k
5.5t
5.5t
56p 56p
180
180
--14--
CXA3225N
j100
j50
j25
0
j25
j50
j100
50
7
8
1000p
S11
I
F
S
W
V
H
F
i
n
50MHz
500MHz
350MHz
j100
j50
j25
0
j25
j50
j100
50
1000p
S11
U
H
F
i
n
1
U
H
F
i
n
2
350MHz
800MHz
9
10
VHF Input Impedance
UHF Input Impedance
--15--
CXA3225N
j100
j50
j25
0
j25
j50
j100
50
45MHz
38MHz
j100
j50
j25
0
j25
j50
j100
50
45MHz
38MHz
IF Output Impedance (symmetrical output)
IF Output Impedance (asymmetrical output)
20PIN SSOP (PLASTIC)
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE STRUCTURE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS
EPOXY RESIN
SOLDER / PALLADIUM
42/COPPER ALLOY
0.1g
SSOP-20P-L01
SSOP020-P-0044
0.1 0.1
0
.
5
0
.
2
0 to 10
DETAIL A
PLATING
6.5 0.1
4
.
4
0
.
1
0.22 0.05
+ 0.1
0.65
20
11
10
1
A
0.1
+ 0.05
1.25 0.1
+ 0.2
0.15 0.02
6
.
4
0
.
2
NOTE: Dimension "
" does not include mold protrusion.
0.13 M
Package Outline Unit : mm
CXA3225N
--16--
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
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