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 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 VCC • Operating temperature Topr 4.75 to 5.30 –20 to +75 V °C Structure Bipolar silicon monolithic IC 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 IFout1 IFout2 UOSC2 BSW UOSC1 VOSC2 IFSW VOSC1 CXA3125N 16 15 14 13 12 11 10 9 UHFOSC OUTPUT Buffer VHFOSC IF AMP VHFMIX UHFMIX Bias MIXout1 MIXout2 GND —2— 5 6 7 8 UHFin2 4 UHFin1 3 VHFin2 2 VHFin1 1 VCC V.REG CXA3125N Pin Description and Equivalent Circuit Pin No. Symbol Typical pin voltage (V) 1 VCC 5.0 2 MIXout1 During VHF reception 4.4 During UHF reception 4.3 3 MIXout2 Equivalent circuit Description Power supply. 2 3 Mixer outputs and IF amplifier inputs. These pins are output with open collector, and they must be connected to power supply via load. 4.4 4.3 4 GND 0 GND. 2.4 5 VHFin1 0 5 3k 3k 3k 3k 6 VHF inputs. Normally a capacitor is connected at Pin 5 to GND and Pin 6 is used for input. 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. 2.4 6 VHFin2 0 0 7 UHFin1 2.4 7 0 8 UHFin2 2.4 9 VOSC1 9 11 3.1 1 50 330 8p 3.2 3k 4.0 11 VOSC2 3k 15p 5.0 —3— VCC External resonance circuit connection for VHF oscillators. CXA3125N Pin No. Symbol Typical pin voltage (V) Equivalent circuit 1 IFSW 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 10 Description 30k 20k 30k 0.8 (when open) 400 10 400 3.2 12 14 12 1 UOSC1 VCC 3.0 3k 3k External resonance circuit connection for UHF oscillators. 3.2 14 UOSC2 3.0 VCC 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. 1 13 BSW — 22k 13 32k During symmetrical output 3.0 15 IFout2 During asymmetrical output 4.3 During symmetrical output 3.0 16 VCC 15 IF outputs. 15 VCC 1 IFout1 During asymmetrical output 2.5 15 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. 1 16 —4— CXA3125N Electrical Characteristics Symbol ICCVU Item 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 1 % cross modulation CM2 ∗1 ∗3 CM3 CM4 Maximum output power Switch ON drift ∗4 +B drift Band switch voltage ∗5 Pomax (sat) ∆fsw1 ∆fsw2 ∆fsw3 ∆fsw4 ∆fst1 ∆fst2 ∆fst3 ∆fst4 VSWV VSWU 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 output∗6 VHF operation fRF=360 MHz symmetrical output∗6 UHF operation fRF=360 MHz symmetrical output∗6 UHF operation fRF=800 MHz symmetrical output∗6 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 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 96 100 dBµ 96 100 dBµ 90 94 dBµ 90 94 dBµ +10 dBm 50 Ω 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 0 3 Max. 52 55 53 56 28 28 33 33 32 32 37 37 15 15 12 12.5 ±300 ±400 ±400 ±400 ±200 ±250 ±250 ±250 0.5 5.5 Unit mA mA mA mA dB dB dB dB dB dB dB dB dB dB dB dB kHz kHz kHz kHz kHz kHz kHz kHz V V ∗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 Ω load impedance and compensated loss by 180 Ω resistor connected to Pins 15 and 16. —5— CXA3125N Electrical Characteristics Measurement Circuit 1 (asymmetrical output) 1.2k +5V 1n Vt 3.3µ 51 1n VL +5V BAND SW ON : UHF OFF : VHF 51 3.2φ 6.5t 47k VH 1n 47k 2.6φ2.5t IF OUT 1T363 1n 1T363 3.2φ 2.5t 0.5p 0.5p 47k 0.5p (UK) 47k 8p 1T363 68p (RH) 10k 1T362 47k 1p (UK) 47k 56p 47k 16p 56p 20 1n 1n IFSW VOSC1 UHFin1 UHFin2 1 2 3 4 5 6 7 8 UOSC1 VOSC2 9 VHFin2 BSW 10 VHFin1 UOSC2 11 GND IFout2 12 MIXout2 13 MIXout1 14 VCC 15 IFout1 1n 16 CXA3125N 2k 1n L1 56p 100 1n 1n 56p 1n VHF IN 3.3µ 1n UHF IN 1n +5V 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 +5V 1n Vt 3.3µ 51 1n VL +5V BAND SW ON : UHF OFF : VHF 51 3.2φ 6.5t 47k VH 1n 47k 2.6φ2.5t 1T363 1n 1T363 3.2φ 2.5t 0.5p 0.5p 47k 0.5p (UK) 47k 8p 1T363 68p (RH) 10k 1T362 47k 1n IF OUT 1p (UK) 47k 56p 47k 16p 56p 20 1n VOSC1 UHFin2 2 3 4 5 6 7 8 UOSC1 1 BSW IFSW 9 UHFin1 10 VOSC2 11 VHFin2 UOSC2 12 VHFin1 IFout2 13 GND 14 MIXout2 15 MIXout1 16 VCC 180 1n IFout1 180 CXA3125N 2k 1n L1 56p 100 1n 1n 56p 1n VHF IN 3.3µ 1n UHF IN 1n +5V 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 Ω 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 Ω for symmetrical output; 30 Ω 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) Reception frequency vs. Conversion gain (for asymmetrical output) 40 30 CG - Conversion gain [dB] ICC - Circuit current [mA] 54 44 : VHF : UHF UHF 25 VHF fIF=45MHz 20 15 10 5 34 4 5 VCC - Supply voltage [V] 0 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 Reception frequency vs. +B drift 400 200 10 DRIFT [kHz] NF - Noise figure [dB] VHF UHF fIF=45MHz 5 0 –200 –400 0 100 200 300 400 500 600 700 800 900 0 Reception frequency [MHz] 200 400 600 800 1000 Reception frequency [MHz] Reception frequency vs. Next adjacent cross modulation (untuned input, for asymmetrical output) I/O characteristics (untuned input, for asymmetrical output) 20 100 80 fIF=45MHz 100kHz 30% AM fUD=fD+12MHz fUD=fD–12MHz 60 40 IF output level [dBm] CM - Cross modulation [dBµ] 120 0 –20 –40 fRF=100MHz (VHF) fRF=450MHz (UHF) fIF is both f=45 MHz. 20 0 –60 –60 100 200 300 400 500 600 700 800 900 Reception frequency [MHz] –40 –20 RF input level [dBm] —10— 0 CXA3125N VHF Input Impedance j50 50MHz 50 VHFin2 0 j100 VHFin1 j25 5 6 1000p S11 350MHz –j25 –j100 –j50 UHF Input Impedance j50 UHFin2 0 j100 UHFin1 j25 7 8 50 1000p S11 350MHz 800MHz –j25 –j100 –j50 —11— CXA3125N IF Output Impedance (symmetrical output) j50 j100 j25 38MHz 45MHz 0 50 –j25 –j100 –j50 IF Output Impedance (asymmetrical output) j50 j25 j100 38MHz 0 45MHz 50 –j25 –j100 –j50 —12— CXA3125N Unit : mm 16PIN SSOP (PLASTIC) + 0.2 1.25 – 0.1 ∗5.0 ± 0.1 0.1 16 9 A 1 6.4 ± 0.2 ∗4.4 ± 0.1 8 + 0.05 0.15 – 0.02 0.65 + 0.1 0.22 – 0.05 0.13 M 0.1 ± 0.1 0.5 ± 0.2 Package Outline 0° to 10° DETAIL A NOTE: Dimension “∗” does not include mold protrusion. PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SSOP-16P-L01 LEAD TREATMENT SOLDER / PALLADIUM PLATING EIAJ CODE SSOP016-P-0044 LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.1g JEDEC CODE —13—