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| CXA3125N All Band TV Tuner IC (VHF-CATV-UHF) For the availability of this product, please contact the sales office. Description The CXA3125N is a TV tuner 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 16-pin SSOP package and is suitable for miniaturizing voltage synthesizer tuner. Features * Low noise figure * Superior cross modulation * Low power consumption (5 V, 43 mA typ.) * IF output can be selected from symmetrical or asymmetrical * SSOP 16-pin package Applications * TV tuners * VCR tuners * CATV tuners Structure Bipolar silicon monolithic IC 16 pin SSOP (Plastic) Absolute Maximum Ratings (Ta=25 C) * Supply voltage VCC -0.3 to +5.5 V * Storage temperature Tstg -55 to +150 C * Allowable power dissipation PD 625 mW (when mounted on a printed circuit board) Operating Conditions * Supply voltage * Operating temperature VCC 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-- E97705A85-TE CXA3125N Block Diagram and Pin Configuration CXA3125N UOSC2 UOSC1 VOSC2 VOSC1 IFout1 IFout2 BSW IFSW 16 15 14 13 12 11 10 9 UHFOSC OUTPUT Buffer VHFOSC IF AMP VHFMIX Bias V.REG UHFMIX 1 VCC 2 MIXout1 3 MIXout2 4 GND 5 VHFin1 6 VHFin2 7 UHFin1 8 UHFin2 --2-- CXA3125N Pin Description and Equivalent Circuit Pin No. 1 Symbol VCC Typical pin voltage (V) 5.0 During VHF reception 4.4 During UHF reception 4.3 4.4 3 MIXout2 4.3 4 GND 0 2.4 5 VHFin1 0 2.4 6 VHFin2 0 0 7 UHFin1 2.4 0 8 UHFin2 2.4 3.1 9 VOSC1 3.2 3k 3k 8p 11 330 Equivalent circuit Description Power supply. 2 3 2 MIXout1 Mixer outputs and IF amplifier inputs. These pins are output with open collector, and they must be connected to power supply via load. GND. 5 3k 3k 6 VHF inputs. Normally a capacitor is connected at Pin 5 to GND and Pin 6 is used for input. 7 3k 3k 8 UHF inputs. Symmetrical input to Pins 7 and 8 or a capacitor is connected at Pin 8 to GND and Pin 7 is used for input. 9 1 50 VCC 4.0 11 VOSC2 5.0 External resonance circuit connection for VHF oscillators. 15p --3-- CXA3125N Pin No. Symbol Typical pin voltage (V) 1 Equivalent circuit Description Symmetrical/asymmetrical selection of IF output. Asymmetrical output is selected for open state; symmetrical output, for connecting to GND. When used as an asymmetrical output, connect to GND with a capacitor. VCC 40k 30k 20k 30k 10 IFSW 0.8 (when open) 10 400 400 3.2 12 UOSC1 3.0 3k 14 12 1 VCC 3k External resonance circuit connection for UHF oscillators. 3.2 14 UOSC2 3.0 VCC 1 13 BSW -- 22k 13 32k Band switching. UHF operation when 3 V or more voltage is applied externally, and VHF operation when 0.5 V or less voltage is applied. IF outputs during symmetrical output. The reverse phase signal to Pin 16 is output during symmetrical output. When asymmetrical output is selected, the signal is not output. During symmetrical output 3.0 15 IFout2 During asymmetrical output 4.3 During symmetrical output 3.0 16 IFout1 During asymmetrical output 2.5 VCC 1 15 15 VCC 1 15 16 IF outputs. --4-- CXA3125N Electrical Characteristics Item Symbol ICCVU See the Electrical Characteristics Measurement Circuits 1 and 2. (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=55 MHz asymmetrical output VHF operation fRF=360 MHz asymmetrical output UHF operation fRF=360 MHz asymmetrical output UHF operation fRF=800 MHz asymmetrical output VHF operation fRF=55 MHz symmetrical output6 VHF operation fRF=360 MHz symmetrical output6 UHF operation fRF=360 MHz symmetrical output6 UHF operation fRF=800 MHz symmetrical output6 VHF operation fRF=55 MHz asymmetrical output VHF operation fRF=360 MHz asymmetrical output UHF operation fRF=360 MHz asymmetrical output UHF operation fRF=800 MHz asymmetrical output VHF operation fD=55 MHz fUD=12 MHz asymmetrical output VHF operation fD=360 MHz fUD=12 MHz asymmetrical output UHF operation fD=360 MHz fUD=12 MHz asymmetrical output UHF operation fD=800 MHz fUD=12 MHz asymmetrical output 50 load, asymmetrical output VHF operation VHF operation UHF operation UHF operation VHF operation VHF operation UHF operation UHF operation VHF operation UHF operation fOSC=100 MHz fOSC=405 MHz fOSC=405 MHz fOSC=845 MHz fOSC=100 MHz fOSC=405 MHz fOSC=405 MHz fOSC=845 MHz Min. 32 35 33 36 22 22 27 27 26 26 31 31 Typ. 43 46 44 47 25 25 30 30 29 29 34 34 11 11 9 9.5 100 100 94 94 +10 300 400 400 400 200 250 250 250 0.5 5.5 Max. 52 55 53 56 28 28 33 33 32 32 37 37 15 15 12 12.5 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 kHz kHz kHz kHz V V ICCVB ICCUU ICCUB CG1U CG2U CG3U CG4U Conversion gain CG1B 1 CG2B CG3B CG4B NF1 Noise figure NF2 1, 2 NF3 NF4 Circuit current CM1 CM2 1 3 CM3 CM4 Maximum output power Switch ON drift 4 Pomax (sat) fsw1 fsw2 fsw3 fsw4 fst1 fst2 fst3 fst4 VSWV VSWU 96 96 90 90 1 % cross modulation +B drift 5 Band switch 0 voltage 3 1 Input level -40 dBm, Value measured with untuned input. 2 Noise figure is the 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 at 12 MHz : 30 % AM, and an interference signal level where S/I=46 dB measured with a spectrum analyzer. 4 Frequency variation from 3 seconds to 3 minutes after switch ON. 5 Frequency variation when VCC=5 V 5 % variation. 6 Value which is measured as 410 load impedance and compensated loss by 180 resistor connected to Pins 15 and 16. --5-- CXA3125N Electrical Characteristics Measurement Circuit 1 (asymmetrical output) 1.2k 1n Vt 3.3 BAND SW ON : UHF OFF : VHF +5V 47k 2.62.5t IF OUT 1T363 0.5p 8p 10k 1T362 47k 1n 16 1n 1n 15 14 13 12 11 10 56p 47k 1p (UK) 56p 16p 20 47k 1T363 0.5p 3.2 2.5t 47k 1n 3.2 6.5t 51 VL 51 VH 1n 1n 47k +5V 0.5p (UK) 47k 1T363 68p (RH) 9 VOSC1 1n UOSC2 CXA3125N MIXout1 MIXout2 UOSC1 VOSC2 IFout1 IFout2 IFSW BSW VCC 1 2 2k L1 3 GND 4 VHFin1 5 1n VHFin2 6 UHFin1 7 1n UHFin2 8 1n 56p 56p 100 1n VHF IN UHF IN 3.3 +5V 1n L1 is a pentagonal coil 4.5 t/4.5 t L without indication is an air-core coil of 0.5 mm diameter. These components value are the setting for USA frequency variation range. --6-- CXA3125N Electrical Characteristics Measurement Circuit 2 (symmetrical output) 1.2k 1n Vt 3.3 BAND SW ON : UHF OFF : VHF +5V 47k 2.62.5t 1T363 0.5p 8p 10k 1T362 IF OUT 180 180 1n 16 1n 1n 15 14 13 12 11 10 47k 56p 47k 1p (UK) 56p 16p 20 47k 1T363 0.5p 3.2 2.5t 47k 1n 3.2 6.5t 51 VL 51 VH 1n 1n 47k +5V 0.5p (UK) 47k 1T363 68p (RH) 9 VOSC1 1n UOSC2 CXA3125N MIXout1 MIXout2 UOSC1 VOSC2 IFout1 IFout2 IFSW BSW VCC 1 2 2k L1 3 GND 4 VHFin1 5 1n VHFin2 6 UHFin1 7 1n UHFin2 8 1n 56p 56p 100 1n VHF IN UHF IN 3.3 +5V 1n L1 is a pentagonal coil 4.5 t/4.5 t L without indication is an air-core coil of 0.5 mm diameter. These components value are the setting for USA frequency variation range. --7-- CXA3125N Description of Operation (See the Electrical Characteristics Measurement Circuit.) VHF oscillator circuit This circuit is a differential amplifier type oscillator circuit. Pin 11 is the output and Pin 9 is the input. Oscillation is performed by connecting an LC resonance circuit including a varicap to Pin 11 via coupled capacitance, inputting to Pin 9 with feedback capacitance, and applying positive feedback. Note that if the capacitance across Pins 9 and 11 is too large, positive feedback may be applied via a parasitic capacitance causing undesired stray oscillation. VHF mixer circuit The mixer circuit employs a double symmetrical mixer with little local oscillation signal leakage. The RF signal is input to Pins 6 and 7. During normal use, the RF signal is input to one pin while the other pin is connected to GND. The RF signal is converted to IF frequency by the signal supplied from the oscillator and then output to Pins 2 and 3. Pins 2 and 3 are open collectors, so power must be supplied externally. Connect to VCC through L which configures external filter or resistor. The electric potential of Pins 2 and 3 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 differential oscillation operation via an LC resonance circuit including a varicap. Feedback capacitance is built into IC, and an LC resonance circuit including a varicap is connected between Pins 12 and 14 via coupled capacitance. UHF mixer circuit This circuit employs a double symmetrical mixer like the VHF mixer circuit. The RF signal is input to Pins 7 and 8. There is a symmetrical input at the differential from both edges of the secondary coil of the pre-stage double-tuned circuits, or an asymmetrical input to Pin 7 with a capacitor connected at Pin 8 to GND. Otherwise, the conditions and usage are the same as those for the VHF mixer circuit. IF amplifier circuit The signals frequency converted by the mixer are output from Pins 2 and 3, and at the same time are AC coupled inside the IC and input to the IF amplifier. Single-tuned filters are connected to Pins 2 and 3 in order to improve the interference characteristics of the IF amplifier. The signal amplified by the IF amplifier is output with symmetrical or asymmetrical output format. Selecting symmetrical or asymmetrical is performed at Pin 10. Asymmetrical output when Pin 10 is for open state; symmetrical output when connected to GND. During symmetrical output, SAW filter direct connection is possible and during asymmetrical output, output stage drive capability is increased to drive 75 load. During asymmetrical output, output is performed from Pin 16, and during symmetrical output, output is performed from Pins 15 and 16. The output impedance is approximately 35 for symmetrical output; 30 for asymmetrical output. When asymmetrical output is selected, connect Pin 10 to GND through capacitor. U/V switch circuit UHF operation is chosen by applying voltage of 3 V or more to Pin 13 VHF operation for 0 V or open. --8-- CXA3125N Notes on Operation 1. Care should be taken for grounding, etc. when placing external parts as high operating frequencies are present. 2. The GND pattern also serves as heat dissipation pins, care should be taken to prevent heat problems. 3. Care should also be taken to prevent electrostatic damage because of using high frequency process. --9-- CXA3125N Example of Representative Characteristics Supply voltage vs. Circuit current (for asymmetrical output) 40 30 Reception frequency vs. Conversion gain (for asymmetrical output) 54 CG - Conversion gain [dB] ICC - Circuit current [mA] UHF 25 VHF 20 15 10 5 0 fIF=45MHz 44 : VHF : UHF 34 4 5 VCC - Supply voltage [V] 6 100 200 300 400 500 600 700 800 900 Reception frequency [MHz] Reception frequency vs. Noise figure (untuned input, for asymmetrical output, DSB display) 15 400 VHF Reception frequency vs. +B drift NF - Noise figure [dB] UHF fIF=45MHz 5 DRIFT [kHz] 10 200 0 -200 -400 0 100 200 300 400 500 600 700 800 900 Reception frequency [MHz] Reception frequency vs. Next adjacent cross modulation (untuned input, for asymmetrical output) 0 200 400 600 800 1000 Reception frequency [MHz] I/O characteristics (untuned input, for asymmetrical output) 20 120 CM - Cross modulation [dB] 100 80 60 40 20 fIF=45MHz 100kHz 30% AM fUD=fD+12MHz fUD=fD-12MHz IF output level [dBm] 0 -20 -40 fRF=100MHz (VHF) fRF=450MHz (UHF) fIF is both f=45 MHz. 0 100 200 300 400 500 600 700 800 900 Reception frequency [MHz] -60 -60 -40 -20 0 RF input level [dBm] --10-- CXA3125N VHF Input Impedance j50 j25 j100 VHFin1 0 50 50MHz 1000p 5 VHFin2 6 S11 350MHz -j25 -j100 -j50 UHF Input Impedance j50 j25 j100 UHFin1 0 7 50 1000p UHFin2 8 S11 350MHz 800MHz -j25 -j100 -j50 --11-- CXA3125N IF Output Impedance (symmetrical output) j50 j25 j100 38MHz 45MHz 0 50 -j25 -j100 -j50 IF Output Impedance (asymmetrical output) j50 j25 j100 38MHz 0 45MHz 50 -j25 -j100 -j50 --12-- CXA3125N Package Outline Unit : mm 16PIN SSOP (PLASTIC) 5.0 0.1 + 0.2 1.25 - 0.1 0.1 16 9 A 4.4 0.1 1 8 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-16P-L01 SSOP016-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g --13-- 0.5 0.2 6.4 0.2 |
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