AN8946SB

AN8946SB PANASONIC | Alldatasheet

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Technical content

FM demodulation IC for BS/CS broadcasting n Overview The AN8946SB is a 5 V 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). n 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 n Applications
• BS/CS tuner, television n Block Diagram SSOP028-P-0375A Unit : mm GND V CC 5 V V CC 5 V Reg. out 2.6 V GND GND Key Comp. Latch VCO REG AFCamp. PD Loopamp.Videoamp. IFamp. DCamp. DCamp.AGCamp. 0.3±0.1 0.1±0.1 (0.4) 2.05±0.2 0.9±0.1 0.9±0.1 0.2+0.1 –0.05 11.6±0.3 9.3±0.3 7.2±0.3 0.8

n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC 5.6 V Supply current I CC 50 mA Power dissipation P D 280 mW Operating ambient temperature * T opr -20 to +75 °C Storage temperature * Tstg -55 to +150 °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 = 25°C. n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 4.5 to 5.5 V Pin No. Description

1 Key pulse input

2 AFC output L

3 AFC output H

4V CC2 (VCO, AFC system) 5V C O 1

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. input 2 Pin No. Description

15 AFC adjustment

16 AGC output 2

17 AGC output 1

18 AGC adjustment

19 IF amp. output

20 Regulator output

21 V CC1 (Main)

22 GND1 (AGC amp., regulator system) 23 IF amp. input 2 24 IF amp. input 1

25 AFC output R

26 AFC LPF2

27 AFC LPF1

28 Key pulse LPF

n Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Total circuit current I TOT V CC = 5 V 28 34 40 mA IF amp. maximum gain GIF max PIFIN = -60 dBm, f = 402.78 MHz 22 25 28 dB V 17 = 5 V IF amp. minimum gain GIF min PIFIN = 0 dBm, f = 402.78 MHz ¾- 29 -25 dB V 17 = 0 V Loop amp. gain G LA PLA in = -30 dBm, f = 1 MHz 22 24 26 dB Video amp. gain G VA PVA in = -10 dBm, f = 1 MHz 6.5 7.0 7.5 dB VCO control sensitivity b f = 402.78 MHz 37 39 41 MHz/V Signal to noise ratio S/N max PIFIN = -30 dBm, 100% W, weighting 62 67 ¾ dB (C/N = ¥ ) LPF 4.2 MHz, HPF 10 kHz Inter-modulation interference IM2 PIFIN = -30 dBm, fC = 3.58 MHz 40 60 ¾ dB ratio (2nd) f S = 5.7272 MHz Inter-modulation interference IM3 PIFIN = -30 dBm, fC = 3.58 MHz 40 60 ¾ dB ratio (3rd) f S = 5.7272 MHz AFC dead-band width BW AFC Pin 2: Low, Pin 3: High 310 360 420 kHz AFC output maximum voltage V AFCH V CC - V3 value, f = 402.78 MHz ¾ 00 . 5V AFC output minimum voltage V AFCL V 2 value, f = 402.78 MHz ¾ 0.1 0.5 V AGC output maximum voltage 1 VAGC1H V CC - V17 value, PIFIN = -70 dBm ¾ 00 . 2V AGC output minimum voltage 1 VAGC1L PIFIN = +10 dBm ¾ 0.3 0.5 V AGC output maximum voltage 2 VAGC2H V CC - V16 value, PIFIN = -70 dBm ¾ 00 . 2V AGC output minimum voltage 2 VAGC2L PIFIN = +10 dBm ¾ 0.3 0.5 V AGC SW level Pin SW f = 402.78 MHz, PIFM = -50 dBm -39 -35 -31 dBm Input level at V16 = 2.5 V Key pulse input maximum voltage VKEYH DC measurement 0.35 ¾¾ V Key pulse input minimum voltage VKEYL DC measurement ¾¾ 0.1 V Noise amplitude V N f = 402.78 MHz with no modulation ¾ 4 10 mV[p-p] and with de-emphasis Measure it at Video out pin. Pin 12 voltage V 12 Voltage to get V17 = 0 V, V2 £ 1 V, 1.0 1.35 1.7 V V 3 ‡ 4 V with no PIFIN . Pin 15 voltage V 15 Voltage to be AFC center with no PIFIN , 1.03 1.15 1.27 V V 17 = 0 V, fVCO = 402.78 MHz

• Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Conditions Min Typ Max Unit IF amp. frequency characteristic fCIF 3 dB down frequency 600 700 ¾ MHz IF amp. NF NF IF f = 402.78 MHz, V17 = 5 V ¾ 12 15 dB Loop amp. frequency characteristic fCLA 3 dB down frequency 200 250 ¾ MHz Loop amp. phase PH LA f = 1 MHz to 20 MHz ¾– 5 –10 °

n Electrical Characteristics at Ta = 25°C (continued)

• Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Conditions Min Typ Max Unit Video amp. frequency DG VAF PVA in = -10 dBm, GVA = 7 dB ¾– 0.1 –0.3 dB characteristic f = 50 Hz to 10 MHz Video amp. phase PH VA f = 50 Hz to 10 MHz, GVA = 7 dB ¾– 10 –20 ° PD detection sensitivity K f f = 402.78 MHz, PIFM = -50 dBm 80 90 100 mv/rad PD frequency characteristic DK fF f = 400 MHz to 500 MHz ¾– 10 –20 mv/red VCO C/N C/N f = 402.78 MHz, –50 kHz 45 48 ¾ dB IF amp. input return loss RL f = 402.78 MHz ¾- 15 -10 dB IF input level PIF IN Pin 24 input level -55 -30 -5d B m AGC regulation DPIFM f = 402.78 MHz ¾– 0.5 –1.0 dB PIFIN = -50 dBm to -10 dBm AGC detection sensitivity DV AGC2 Pin 16 output sensitivity 4 5 ¾ V/dB Lock range LR PIF IN = -50 dBm to -10 dBm –18 –20 ¾ MHz Capture range CR PIF IN = -50 dBm to -10 dBm –14 –18 ¾ MHz Demodulation frequency DV OF f = 50 Hz to 10 MHz ¾– 0.2 –0.5 dB characteristic Demodulation group delay GD f = 50 Hz to 10 MHz ¾– 5 –10 ns characteristic Differential gain DG APL 10% to 90% ¾ 0.5 1.0 % Differential phase DP APL 10% to 90% ¾ 0.5 1.0 ° AGC SW level temperature DPSWT Ta = 25°C typical ¾– 1.0 –2.0 dB characteristic T a = -10°C to +80°C Free-run frequency temperatureDfOSCT Ta = 25°C typical ¾– 0.5 –1.0 MHz characteristic T a = -10°C to +80°C AFC center frequency DfAFCT Ta = 25°C typical ¾– 0.5 –1.0 MHz temperature characteristic T a = -10°C to +80°C AFC dead-band width DBW AFCT Ta = 25°C typical ¾+ 80 +100 kHz temperature characteristic T a = -10°C to +80°C -40 -50 IF monitor level temperatureDPIFM Ta = 25°C typical ¾– 0.5 –1.0 dB characteristic T a = -10°C to +80°C Free-run frequency SW on driftDfOSCSW t = 10 minutes later, referring to 3 s¾– 0.2 –0.5 MHz after VCC SW on Video amp. base current I 10 Pin 9 open, R10 - R11 = 100 kW 1.0 2.4 5.2 mA Regulator output voltage V 20 V CC = 5 V 2.4 2.6 2.8 V Regulator output voltage DV 20 V CC = 4.5 V to 5.5 V ¾– 5 –15 mV fluctuation

Pin No. Equivalent circuit Description Voltage (Open)

1 Key pulse input 30 mV

• No input at receiving NTSC signal.
• Input a key pulse in a direct DC con- nection at receiving MUSE signal.

2 AFC output L 0 V to 5 V

• Output impedance can be lowered by adding an external resistor.

3 AFC output H 0 V to 5 V

• Output impedance can be lowered by adding an external resistor. 4V CC2 Apply 5 V
• Supply power for VCO, AFC from outside

5 VCO1 Floating

• Connects a resonance circuit between pin 5 and pin 7.

6 GND3 Apply 0 V

• GND for VCO, AFC from outside

7 Same as VCO1 VCO2 Floating

• Connects a resonance circuit between pin 5 and pin 7. n Terminal Equivalent Circuits 1 kW 10 kW 1 kW10 kW 200 W 1 kW10 kW 200 W 5 7

10 W 10 W

200 W 200 W

Pin No. Equivalent circuit Description Voltage (Open)

8 GND2 Apply 0 V

• GND pin except VCO, AFC and IF from outside amp. 9 Loop amp. output 1.5 V
• pin to drive a variable capacitance diode for VCO. 10 Pin 10 Video amp. input Floating 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 11 4.2 V 12 Free-run frequency adjustment 1.3 V
• Changing pin 12 potential enables you to cancel an offset voltage of a loop amp. n Terminal Equivalent Circuits (continued) 200 W 2 mA 1.5 V

1.5 V 500 mA 2 mA

Pin No. Equivalent circuit Description Voltage (Open) 13 Loop amp. input 1 1.5 V

• Connect a lag-lead filter between pin 13 and pin 14. 14 Loop amp. input 2 1.5 V
• Connect a lag-lead filter between pin 13 and pin 14. 15 AFC adjustment 4.8 V
• Adjust a center frequency of AFC by changing pin 15 potential.

16 AGC output 2 5 V

• Output pin for external AGC (previ- ous stage)

17 AGC output 1 5 V

• Filter pin for inner AGC n Terminal Equivalent Circuits (continued) 1 mA 500 W 1 mA 500 W 15 200 W 14.2 kW 100 mA 200 mA 20 kW 1 kW

200 W20 kW20 kW

Pin No. Equivalent circuit Description Voltage (Open) 18 AGC adjustment 1.4 V

• Inner AGC adjustment pin
• Use at adjusting an IF monitor level. 19 IF amp. output 3.3 V
• Pin to check an IF amp. output level 20 Regulator output 2.6 V
• 2.6 V reference voltage output pin
• Driving capability is 1 mA.

21 V CC1 Apply 5 V

• Power supply pin except VCO, AFC from outside

22 GND1 Apply 0 V

• GND for IF amp. (AGC amp., regul- from outside ator) 23 IF amp. input 2 3.2 V
• IF amp. complementary input pin
• Ground in AC with an external capaci- tor 24 IF amp. input 3.2 V
• IF amp. input pin n Terminal Equivalent Circuits (continued) 18 50 kW 12 kW 14 kW 19150 W 500 mA 500 W Approx. 900 mA 500 mA 15 pF 2 kW 2 kW

Pin No. Equivalent circuit Description Voltage (Open) 25 AFC output R 1.5 V

• Outputted is a center point potential of a loop amp. output dynamic range.
• Also used as a reference power supply for video amp. 26 AFC LPF2 1.5 V
• Construct a filter with an output im- pedance approximately 500 kW at pin 26 and an external capacitor between pin 26 and pin 27. 27 AFC LPF1 0.6 V
• Low impedance (approximately 0.7 V) for low-level (0 V) of pin 1
• High impedance (floating) for high- level (0.5 V) of pin 1

28 Key pulse LPF 0 V

• Pin to smooth a key pulse
• Identifying a key pulse by this pin. n Terminal Equivalent Circuits (continued) 100 mA 1 kW10 kW 500 kW 100 mA 1 kW 27500 W 200 W 10 kW 20 kW 50 kW 1 kW

n Application Circuit Example Key Comp. Latch VCO REG AFCamp. PD Loopamp.Videoamp. IFamp. DCamp. DCamp.AGCamp. GND GND GND V CC 5 V Key pulse in 10 pF 100 nF 100 pF 100 nF De-emph. Keyed ident. 2nd IF in 100 nF 10 nF 10 nF AGC out1 100 nF AGC out2 100 nF 1 nF 100 pF 2.6 V Reg. IF monitor out AGC adj. AFC adj. 47 W 10 kW 47 W 22 kW10 kW15 kW 560 W 10 kW VCO adj. 1 kW 39 W 10 W 1.2 kW 2.7 kW 10 W 27 pF 4 pF 3 pF 2 pF MA376 27 pF LPF Clamp Det. out Video out 100 nF AFC out L AFC out H