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CXA3225N
All Band TV Tuner IC (VHF-CATV-UHF)
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 20 pin SSOP (Plastic)
-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 * Operating temperature
VCC1 Topr
4.75 to 5.30 -20 to +75
V C
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--
E98950-TE
CXA3225N
Block Diagram and Pin Configuration
BANDSW UOSCB2 UOSCE2 UOSCE1 UOSCB1 VOSCB2 VOSCB1 11 10 UHFIN2 VOSCC 13 IFOUT1 IFOUT2 19
20
18
17
16
15
14
12
IF AMP
UHF OSC
VHF OSC
Bias
Buffer
Buffer
V. REG
VHF MIX
UHF MIX
1
IFIN1
2
IFIN2
3
VCC
4
MIXOUT1
5
MIXOUT2
6
GND
7
IFSW
8
VHFIN
9
UHFIN1
--2--
CXA3225N
Pin Description and Equivalent Circuit Pin No. Symbol Typical pin voltage (V)
3
Equivalent circuit
Description
1
IFIN1
2.4
1
5k 5k
2
IF amplifier input.
2
IFIN2
2.4
3
4
5
6
5.0 4.4 during VHF reception MIXOUT1 4.3 during UHF reception 4.4 during VHF reception MIXOUT2 4.3 during UHF reception GND 0
VCC
Power supply.
4 5
Mixer outputs. These pins are output with open collector, and they must be connected to the power supply via the load.
3
20k
7
IFSW
0.8 (when open)
7
500
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.
3
VCC
2.4 during VHF reception 8 VHFIN 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
8
3k 3k
7
IFSW
VHF inputs. Input format is asymmetrical input.
3
9
UHFIN1
9
3k 3k
10
10
UHFIN2
UHF inputs. Input the signal to Pins 9 and 10 symmetrically or ground Pin 10 with a capacitor and input to Pin 9.
--3--
CXA3225N
Pin No. 11
Symbol
VOSCB1
12
VOSCB2
13
VOSCC
14
UOSCB1
15
UOSCE1
16
UOSCE2
17
UOSCB2
Typical pin voltage (V) 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
Equivalent circuit
3
VCC 400 13 50 12 3k 3k 11
Description
External resonance circuit connection for VHF oscillators. Pin 12 is grounded with a capacitor.
3
VCC 14 15 16 17 3k
External resonance circuit connection for UHF oscillators.
3k
VCC
3
18
BANDSW
--
10k 18 100k
Band switching. UHF operation for 3.0 V or more, and VHF operation for 0.5 V or less or open state.
2.8 during symmetrical output 19 IFOUT2 4.5 during asymmetrical output
3
VCC
15 19
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.
--4--
CXA3225N
Pin No.
Symbol
Typical pin voltage (V) 2.8 during symmetrical output
Equivalent circuit
3
VCC
Description
20
IFOUT1 2.8 during asymmetrical output
15 20
IF output.
--5--
CXA3225N
Electrical Characteristics Item Symbol ICCVU
See the Electrical Characteristics Measurement Circuit (Ta=25 C, VCC=5 V) 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 fRF=50 MHz asymmetrical output VHF operation fRF=430 MHz asymmetrical output UHF operation fRF=430 MHz asymmetrical output UHF operation fRF=850 MHz asymmetrical output VHF operation fRF=50 MHz symmetrical output VHF operation fRF=430 MHz symmetrical output UHF operation fRF=430 MHz symmetrical output UHF operation fRF=850 MHz symmetrical output VHF operation fRF=50 MHz asymmetrical output VHF operation fRF=430 MHz asymmetrical output UHF operation fRF=430 MHz asymmetrical output UHF operation fRF=850 MHz asymmetrical output VHF operation fD=50 MHz fUD=12 MHz asymmetrical output VHF operation fD=430 MHz fUD=12 MHz asymmetrical output UHF operation fD=430 MHz fUD=12 MHz asymmetrical output UHF operation fD=850 MHz fUD=12 MHz asymmetrical output 50 load, asymmetrical output VHF operation fOSC=100 MHz f from 3 seconds to 3 minutes after switch ON VHF operation fOSC=470 MHz f from 3 seconds to 3 minutes after switch ON UHF operation fOSC=470 MHz f from 3 seconds to 3 minutes after switch ON UHF operation fOSC=895 MHz f from 3 seconds to 3 minutes after switch ON Min. 35 47 39 51 20 20 23 23 29 29 32 32 Typ. 46 58 50 62 23 23 26 26 32 32 35 35 12 13 10 12 103 100 100 99 10 300 600 350 350 Max. 55 67 59 71 26 26 29 29 35 35 38 38 16 17 13 15 Unit mA mA mA mA dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dBm kHz kHz kHz kHz
ICCVB ICCUU ICCUB CG1U CG2U CG3U CG4U Conversion gain CG1B 4 1 CG2B 4 CG3B 4 CG4B 4 Circuit current Noise figure 1, 2 NF1 NF2 NF3 NF4 CM1 CM2 1 3 CM3 CM4 Maximum output power Pomax (sat) fsw1 fsw2 Switch ON drift fsw3 fsw4
99 96 96 95 7
1 % cross modulation
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. --6--
CXA3225N
Item
Symbol fst1 fst2 fst3 fst4
Supply voltage drift
Band switching voltage
VSWV VSWU
Measurement conditions VHF operation fOSC=100 MHz f when VCC 5 V 5 % variation VHF operation fOSC=470 MHz f when VCC 5 V 5 % variation UHF operation fOSC=470 MHz f when VCC 5 V 5 % variation UHF operation fOSC=895 MHz f when VCC 5 V 5 % variation VHF operation UHF operation
Min.
Typ.
Max. 200 250 150 150
Unit kHz kHz kHz kHz V V
0 3
0.5 5.5
--7--
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. --8--
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.
--9--
CXA3225N
Example of Representative Characteristics
Supply voltage vs. Circuit current (asymmetrical output)
Supply voltage vs. Circuit current (symmetrical output) 70 68 66 UHF 64 ICC-Circuit current [mA]
54 UHF
52 ICC-Circuit current [mA]
50
62 60 58 56 VHF
48 VHF 46
44 54 42 52 50 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 VCC-Supply voltage [V] VCC-Supply voltage [V]
40
Reception frequency vs. Conversion gain (asymmetrical output) 40 fIF=38MHz
Reception frequency vs. Next adjacent cross modulation (untuned input, asymmetrical output) 140
120 30 CG-Conversion gain [dB] UHF VHF (Low) VHF (High) CM-Cross modulation [dB] 100
80 fIF=38MHz fUD=fD+12MHz fUD=fD-12MHz (100kHz, 30% AM)
20
60
40
10 20
0 0 100 200 300 400 500 600 700 800 900 1000 Reception frequency [MHz]
0 0 100 200 300 400 500 600 700 800 900 Reception frequency [MHz]
--10--
CXA3225N
Reception frequency vs. Noise figure (untuned input, asymmetrical output, DSB display) 20 fIF=38MHz
I/O characteristics (untuned input, asymmetrical output) 20
15 VHF (High) NF-Noise figure [dBm] UHF VHF (Low) 10 IF output level [dBm]
0
-20 fRF=100MHz (VHF) fRF=500MHz (UHF) fIF is both f=38MHz -40
5
0 0 100 200 300 400 500 600 700 800 900 Reception frequency [MHz]
-60 -60
-40
-20
0
RF input level [dBm]
I/O characteristics (untuned input, symmetrical output) 40
Supply voltage fluctuation of oscillation frequency 400 VCC+5% VCC-5% (VCC=5V)
300
20 IF output level [dBm]
200 VHF (Low) VHF (High) 100 +B drift [kHz] UHF 0
0 fRF=100MHz (VHF) fRF=500MHz (UHF) fIF is both f=38MHz -20
-100
-200
-300
-40 -60
-400 -40 -20 0 0 100 200 300 400 500 600 700 800 900 Oscillation frequency [MHz] RF input level [dBm]
--11--
CXA3225N
Electrical Characteristics Measurement Circuit (asymmetrical output)
VT 1k
1n
BVL 3.3 +5V ON : UHF OFF : VHF 21.5t IF OUT 0.5p (UK) 1T363 10k 47k 1n 16p 20 IFOUT1 19 IFOUT2 18 BANDSW 17 UOSCB2 16 UOSCE2 3p 15 UOSCE1 6p 14 UOSCB1 13 VOSCC 12p 12 VOSCB2 15p 11 VOSCB1 100 20p 47k 100p 12p (RH) 1T362 100p 47k 1T362 1T363 47k 47k 47k 1n 3 1.5t 0.5p (UK) 680p 1n 47k 51 33p 3.2 6.5t 47k 51 BVH
U/VSW
CXA3225N MIXOUT1 MIXOUT2
UHFIN1
1
2
12p
3
4
5
6
7
1n
8
1n
9
1n
10 1n
12p 5.5t
2k 5.5t 56p 56p
100 1n VHF IN UHF IN
3.3 +5V
1n
--12--
UHFIN2
VHFIN
IFSW
IFIN1
IFIN2
GND
VCC
CXA3225N
Electrical Characteristics Measurement Circuit (symmetrical output)
VT 1k
1n
BVL 3.3 +5V ON : UHF OFF : VHF 21.5t 0.5p (UK) 1T363 IF OUT 180 10k 180 1n 20 IFOUT1 19 IFOUT2 1n 18 BANDSW 17 UOSCB2 47k 100p 12p (RH) 1T362 100p 47k 16p 16 UOSCE2 3p 15 UOSCE1 6p 14 UOSCB1 13 VOSCC 12p 12 VOSCB2 15p 11 VOSCB1 100 20p 47k 1T362 1T363 47k 47k 47k 1n 3 1.5t 0.5p (UK) 680p 1n 47k 51 33p 3.2 6.5t 47k 51 BVH
U/VSW
CXA3225N MIXOUT1 MIXOUT2
UHFIN1
1
2
12p
3
4
5
6
1n
7
1n
8
1n
9
1n
10 1n
12p 5.5t
2k 5.5t 56p 56p
100 1n VHF IN UHF IN
3.3 +5V
1n
--13--
UHFIN2
VHFIN
IFSW
IFIN1
IFIN2
GND
VCC
CXA3225N
VHF Input Impedance
j50
j25
j100
0
50
50MHz 1000p
7
8
VHFin S11 10 UHFin2 S11
350MHz
-j25
-j100 500MHz
-j50
UHF Input Impedance
j50
j25
j100
0
50 1000p
350MHz
800MHz -j25
-j100
-j50
--14--
UHFin1
IFSW
9
CXA3225N
IF Output Impedance (symmetrical output)
j50
j25
j100
45MHz 0 38MHz 50
-j25
-j100
-j50
IF Output Impedance (asymmetrical output)
j50
j25
j100
38MHz
0
45MHz
50
-j25
-j100
-j50
--15--
CXA3225N
Package Outline
Unit : mm
20PIN SSOP (PLASTIC)
6.5 0.1 + 0.2 1.25 - 0.1 0.1 20 11 A
4.4 0.1
1
10 0.65 + 0.05 0.15 - 0.02
+ 0.1 0.22 - 0.05
0.13 M 0.1 0.1
0 to 10 DETAIL A NOTE: Dimension "" does not include mold protrusion.
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-20P-L01 SSOP020-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--16--
0.5 0.2
6.4 0.2

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