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| ICs for TV AN8946SB FM demodulation IC for BS/CS broadcasting s Overview The AN8946SB is a 5 V single power supply and low power consumption FM demodulation IC for BS/CS broadcasting. It features PLL * FM demodulation, 2nd IF AGC amp., AGC detection and AFC (applicable to both mean value and keyed types). 1 28 0.30.1 Unit : mm s Features * 5 V single power source * Low power dissipation (typ. 170 mW) * S/N 65 dB or more * Inter-modulation interference ratio: 50 dB or more * AGC amp built in (Reduction range: 55 dB) * Adjustment-free VCO coil 14 0.10.1 15 (0.4) 7.20.3 9.30.3 s Applications * BS/CS tuner, television SSOP028-P-0375A s Block Diagram 21 VCC 5V 20 Reg. out 28 27 26 25 24 23 22 GND 2.6 V 19 18 17 16 AFC amp. AGC amp. IF amp. DC amp. DC amp. Key Comp. PD Latch VCO VCC 4 5V 5 6 7 REG 10 8 9 Video amp. 11 Loop amp. 12 13 14 1 2 3 GND GND 15 0.2 +0.1 -0.05 0.90.1 2.050.2 0.90.1 0.8 11.60.3 1 AN8946SB s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Description Key pulse input AFC output L AFC output H VCC2 (VCO, AFC system) VCO1 GND3 (VCO system) VCO2 GND2 (Main) Loop amp. output Video amp. input Video amp. output Free-run frequency adjustment Loop amp. input 1 Loop amp. input 2 Pin No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Description AFC adjustment AGC output 2 AGC output 1 AGC adjustment IF amp. output Regulator output VCC1 (Main) ICs for TV GND1 (AGC amp., regulator system) IF amp. input 2 IF amp. input 1 AFC output R AFC LPF2 AFC LPF1 Key pulse LPF s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature * * Symbol VCC ICC PD Topr Tstg Rating 5.6 50 280 -20 to +75 -55 to +150 Unit V mA mW C C Note) 1. Be carefl for static electricity damage of pin 1 to pin 5, pin 7, pin 21, pin 26 and pin 28. 2. *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 4.5 to 5.5 Unit V 2 ICs for TV s Electrical Characteristics at Ta = 25C Parameter Total circuit current IF amp. maximum gain IF amp. minimum gain Loop amp. gain Video amp. gain VCO control sensitivity Signal to noise ratio (C/N = ) Inter-modulation interference ratio (2nd) Inter-modulation interference ratio (3rd) AFC dead-band width AFC output maximum voltage AFC output minimum voltage Symbol ITOT GIFmax GIFmin GLA GVA S/Nmax IM2 IM3 BWAFC VAFCH VAFCL VCC = 5 V PIFIN = -60 dBm, f = 402.78 MHz V17 = 5 V PIFIN = 0 dBm, f = 402.78 MHz V17 = 0 V PLA in = -30 dBm, f = 1 MHz PVA in = -10 dBm, f = 1 MHz f = 402.78 MHz PIFIN = -30 dBm, 100%W, weighting LPF 4.2 MHz, HPF 10 kHz PIFIN = -30 dBm, fC = 3.58 MHz fS = 5.7272 MHz PIFIN = -30 dBm, fC = 3.58 MHz fS = 5.7272 MHz Pin 2: Low, Pin 3: High VCC - V3 value, f = 402.78 MHz V2 value, f = 402.78 MHz VCC - V17 value, PIFIN = -70 dBm PIFIN = +10 dBm VCC - V16 value, PIFIN = -70 dBm PIFIN = +10 dBm f = 402.78 MHz, PIFM = -50 dBm Input level at V16 = 2.5 V DC measurement DC measurement f = 402.78 MHz with no modulation and with de-emphasis Measure it at Video out pin. Voltage to get V17 = 0 V, V2 1 V, V3 4 V with no PIFIN . Voltage to be AFC center with no PIFIN , V17 = 0 V, fVCO = 402.78 MHz Conditions Min 28 22 22 6.5 37 62 40 40 310 -39 0.35 Typ 34 25 -29 24 7.0 39 67 60 60 360 0 0.1 0 0.3 0 0.3 -35 4 AN8946SB Max 40 28 -25 26 7.5 41 420 0.5 0.5 0.2 0.5 0.2 0.5 -31 0.1 10 Unit mA dB dB dB dB MHz/V dB dB dB kHz V V V V V V dBm V V mV[p-p] AGC output maximum voltage 1 VAGC1H AGC output minimum voltage 1 VAGC1L AGC output maximum voltage 2 VAGC2H AGC output minimum voltage 2 AGC SW level Key pulse input maximum voltage Key pulse input minimum voltage Noise amplitude VAGC2L PinSW VKEYH VKEYL VN Pin 12 voltage Pin 15 voltage V12 V15 1.0 1.03 1.35 1.15 1.7 1.27 V V * Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter IF amp. frequency characteristic IF amp. NF Loop amp. frequency characteristic Loop amp. phase Symbol fCIF NFIF fCLA PHLA Conditions 3 dB down frequency f = 402.78 MHz, V17 = 5 V 3 dB down frequency f = 1 MHz to 20 MHz Min 600 200 Typ 700 12 250 5 Max 15 10 Unit MHz dB MHz 3 AN8946SB s Electrical Characteristics at Ta = 25C (continued) * Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. ICs for TV Parameter Video amp. frequency characteristic Video amp. phase PD detection sensitivity PD frequency characteristic VCO C/N IF amp. input return loss IF input level AGC regulation AGC detection sensitivity Lock range Capture range Demodulation frequency characteristic Demodulation group delay characteristic Differential gain Differential phase AGC SW level temperature characteristic Free-run frequency temperature characteristic AFC center frequency temperature characteristic AFC dead-band width temperature characteristic IF monitor level temperature characteristic Free-run frequency SW on drift Video amp. base current Regulator output voltage Regulator output voltage fluctuation Symbol GVAF PHVA K KF C/N RL PIFIN PIFM VAGC2 LR CR VOF GD DG DP PSWT fOSCT fAFCT Conditions PVA in = -10 dBm, GVA = 7 dB f = 50 Hz to 10 MHz f = 50 Hz to 10 MHz, GVA = 7 dB f = 402.78 MHz, PIFM = -50 dBm f = 400 MHz to 500 MHz f = 402.78 MHz, 50 kHz f = 402.78 MHz Pin 24 input level f = 402.78 MHz PIFIN = -50 dBm to -10 dBm Pin 16 output sensitivity PIFIN = -50 dBm to -10 dBm PIFIN = -50 dBm to -10 dBm f = 50 Hz to 10 MHz f = 50 Hz to 10 MHz APL 10% to 90% APL 10% to 90% Ta = 25C typical Ta = -10C to +80C Ta = 25C typical Ta = -10C to +80C Ta = 25C typical Ta = -10C to +80C Min 80 45 -55 4 18 14 1.0 2.4 Typ 0.1 10 90 10 48 -15 -30 0.5 5 20 18 0.2 5 0.5 0.5 1.0 0.5 0.5 +80 -40 0.5 0.2 2.4 2.6 5 Max 0.3 20 100 20 -10 -5 1.0 0.5 10 1.0 1.0 2.0 1.0 1.0 +100 -50 1.0 0.5 5.2 2.8 15 Unit dB mv/rad mv/red dB dB dBm dB V/dB MHz MHz dB ns % dB MHz MHz kHz dB MHz A V mV BWAFCT Ta = 25C typical Ta = -10C to +80C PIFM fOSCSW I10 V20 V20 Ta = 25C typical Ta = -10C to +80C t = 10 minutes later, referring to 3 s after VCC SW on Pin 9 open, R10 - R11 = 100 k VCC = 5 V VCC = 4.5 V to 5.5 V 4 ICs for TV s Terminal Equivalent Circuits Pin No. 1 Equivalent circuit 1 1 k 10 k Description Key pulse input * No input at receiving NTSC signal. * Input a key pulse in a direct DC connection at receiving MUSE signal. AN8946SB Voltage (Open) 30 mV 2 10 k 200 1 k 2 AFC output L * Output impedance can be lowered by adding an external resistor. 0 V to 5 V 3 10 k 200 1 k 3 AFC output H * Output impedance can be lowered by adding an external resistor. 0 V to 5 V 4 VCC2 * Supply power for VCO, AFC Apply 5 V from outside 4 5 VCO1 * Connects a resonance circuit between pin 5 and pin 7. Floating 200 2 pF 200 2 pF 10 5 6 2 pF 2 mA 2 pF 7 10 GND3 6 * GND for VCO, AFC Apply 0 V from outside 7 Same as VCO1 VCO2 * Connects a resonance circuit between pin 5 and pin 7. Floating 5 AN8946SB s Terminal Equivalent Circuits (continued) Pin No. 8 Equivalent circuit 8 Description GND2 * GND pin except VCO, AFC and IF amp. Loop amp. output * pin to drive a variable capacitance diode for VCO. ICs for TV Voltage (Open) Apply 0 V from outside 9 200 1.5 V 9 2 mA 10 1.5 V 10 11 11 100 10 1.5 V 500 A 2 mA Pin 10 Video amp. input Pin 11 Video amp. output * Pin 10 is a reverse phase input pin to pin11. * When a resistor between pin 9 and pin 10 is R1 and a resistor between pin 10 and pin 11 is R2, the gain is R2/R1 and a reverse signal to pin 9 is outputted from pin 11 Floating 11 4.2 V 12 20 13 k 12 10 k 13 k Free-run frequency adjustment * Changing pin 12 potential enables you to cancel an offset voltage of a loop amp. 1.3 V 6 ICs for TV s Terminal Equivalent Circuits (continued) Pin No. 13 13 500 1 mA AN8946SB Equivalent circuit Description Loop amp. input 1 * Connect a lag-lead filter between pin 13 and pin 14. Voltage (Open) 1.5 V 14 14 500 1 mA Loop amp. input 2 * Connect a lag-lead filter between pin 13 and pin 14. 1.5 V 15 100 A 200 A AFC adjustment * Adjust a center frequency of AFC by changing pin 15 potential. 4.8 V 14.2 k 15 200 16 20 k 16 1 k AGC output 2 * Output pin for external AGC (previous stage) 5V 17 AGC output 1 * Filter pin for inner AGC 5V 20 k 1 k 20 k 200 17 7 AN8946SB s Terminal Equivalent Circuits (continued) Pin No. 18 Equivalent circuit Description ICs for TV Voltage (Open) 1.4 V 20 50 k 12 k 14 k AGC adjustment * Inner AGC adjustment pin * Use at adjusting an IF monitor level. 18 19 IF amp. output * Pin to check an IF amp. output level 3.3 V 150 500 A 19 20 500 Regulator output * 2.6 V reference voltage output pin * Driving capability is 1 mA. 2.6 V 20 Approx. 900 A 21 VCC1 * Power supply pin except VCO, AFC 21 Apply 5 V from outside 22 22 GND1 Apply 0 V * GND for IF amp. (AGC amp., regul- from outside ator) IF amp. input 2 * IF amp. complementary input pin * Ground in AC with an external capacitor 3.2 V 23 24 2 k 24 2 k 500 A 15 pF 23 IF amp. input * IF amp. input pin 3.2 V 8 ICs for TV s Terminal Equivalent Circuits (continued) Pin No. 25 25 10 k 100 A 1 k Equivalent circuit Description AFC output R * Outputted is a center point potential of a loop amp. output dynamic range. * Also used as a reference power supply for video amp. AN8946SB Voltage (Open) 1.5 V 26 26 500 k 100 A 1 k AFC LPF2 * Construct a filter with an output impedance approximately 500 k at pin 26 and an external capacitor between pin 26 and pin 27. 1.5 V 27 10 k 500 200 AFC LPF1 * Low impedance (approximately 0.7 V) for low-level (0 V) of pin 1 * High impedance (floating) for highlevel (0.5 V) of pin 1 0.6 V 27 28 20 k 50 k 28 1 k Key pulse LPF * Pin to smooth a key pulse * Identifying a key pulse by this pin. 0V 9 AN8946SB s Application Circuit Example 10 VCC 5 V Key Key pulse in Keyed ident. 10 nF 10 nF 10 pF 4 100 nF 5 24 10 100 nF 2nd IF in 100 pF 1 nF 22 GND 25 AFC out L 2 27 1 28 AFC amp. Latch Comp. AFC out H 3 26 AGC amp. 47 27 pF GND 6 23 VCO 2 pF 10 7 PD 39 MA376 GND 8 100 nF 21 100 nF 20 REG 3 pF 9 1.2 k 10 2.6 V Reg. 47 19 IF amp. IF monitor out 100 pF 18 AGC adj. Video amp. VCO adj. 12 10 k 13 4 pF 2.7 k 11 DC amp. De-emph. 1 k 27 pF 560 17 Loop amp. DC amp. 10 k 16 14 15 100 nF 100 nF AGC out1 AGC out2 LPF Clamp Det. out Video out ICs for TV 15 k 10 k 22 k AFC adj. |
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