an8946sb Panasonic Corporation of North America, an8946sb Datasheet
an8946sb
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an8946sb Summary of contents
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... ICs for TV AN8946SB FM demodulation IC for BS/CS broadcasting Overview The AN8946SB single power supply and low power consumption FM demodulation IC for BS/CS broad- casting. It features PLL · FM demodulation, 2nd IF AGC amp., AGC detection and AFC (applicable to both mean value and keyed types). Features 5 V single power source Low power dissipation (typ ...
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... AN8946SB Pin Descriptions Pin No. Description 1 Key pulse input 2 AFC output L 3 AFC output (VCO, AFC system) CC2 5 VCO1 6 GND3 (VCO system) 7 VCO2 8 GND2 (Main) 9 Loop amp. output 10 Video amp. input 11 Video amp. output 12 Free-run frequency adjustment 13 Loop amp. input 1 14 Loop amp ...
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... Voltage to be AFC center with no PIF 402.78 MHz 17 VCO Conditions down frequency CIF f 402.78 MHz down frequency CLA f 1 MHz to 20 MHz LA AN8946SB Min Typ Max Unit 6.5 7.0 7 ...
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... AN8946SB Electrical Characteristics at T Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Video amp. frequency characteristic Video amp. phase PH PD detection sensitivity PD frequency characteristic VCO C/N IF amp. input return loss ...
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... Connects a resonance circuit between pin 5 and pin GND3 • GND for VCO, AFC VCO2 • Connects a resonance circuit between pin 5 and pin 7. AN8946SB Voltage (Open Apply 5 V from outside Floating Apply 0 V from outside ...
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... AN8946SB Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit 200 1 500 A 1 Description GND2 • GND pin except VCO, AFC and IF amp. Loop amp. output • pin to drive a variable capacitance diode for VCO. 9 Pin 10 Video amp. input Pin 11 Video amp ...
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... Connect a lag-lead filter between pin 13 and pin 14. AFC adjustment • Adjust a center frequency of AFC by 200 A changing pin 15 potential. AGC output 2 • Output pin for external AGC (previ- ous stage) 16 AGC output 1 • Filter pin for inner AGC 200 AN8946SB Voltage (Open) 1.5 V 1 ...
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... AN8946SB Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit 150 500 A 20 500 Approx. 900 500 Description AGC adjustment 20 • Inner AGC adjustment pin • Use at adjusting an IF monitor level. IF amp. output • ...
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... AFC LPF1 • Low impedance (approximately 0.7 V) for low-level ( pin 1 • High impedance (floating) for high- level (0 pin 1 27 Key pulse LPF • Pin to smooth a key pulse • Identifying a key pulse by this pin. 28 AN8946SB Voltage (Open) 1.5 V 1 ...
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... AN8946SB Application Circuit Example AFC amp. Key Comp. Latch 10 2.6 V Reg. 47 AGC IF amp. amp. PD Video VCO REG amp MA376 ICs for TV AFC adj amp. amp. Loop amp Det. out De-emph. LPF Clamp Video out ...