ICs for TV AN8946SB FM demodulation IC for BS/CS broadcasting ■ Overview 28 14 15 ■ Features 0.2 +0.1 –0.05 0.9±0.1 2.05±0.2 0.1±0.1 • 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 0.9±0.1 0.8 11.6±0.3 1 0.3±0.1 Unit : mm 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). (0.4) 7.2±0.3 9.3±0.3 SSOP028-P-0375A ■ Applications • BS/CS tuner, television AFC amp. 15 16 17 18 2.6 V 19 DC amp. DC amp. PD 14 13 12 10 9 8 Loop amp. GND 11 Video amp. REG 7 6 VCO VCC 4 5V 5 3 2 21 VCC 5V 20 Reg. out IF amp. Comp. Latch 1 22 AGC amp. GND Key 23 24 25 26 27 28 GND ■ Block Diagram 1 AN8946SB ICs for TV ■ Pin Descriptions Pin No. Description Pin No. Description 1 Key pulse input 15 AFC adjustment 2 AFC output L 16 AGC output 2 3 AFC output H 17 AGC output 1 4 VCC2 (VCO, AFC system) 18 AGC adjustment 5 VCO1 19 IF amp. output 6 GND3 (VCO system) 20 Regulator output 7 VCO2 21 VCC1 (Main) 8 GND2 (Main) 22 GND1 (AGC amp., regulator system) 9 Loop amp. output 23 IF amp. input 2 10 Video amp. input 24 IF amp. input 1 11 Video amp. output 25 AFC output R 12 Free-run frequency adjustment 26 AFC LPF2 13 Loop amp. input 1 27 AFC LPF1 14 Loop amp. input 2 28 Key pulse LPF ■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage VCC 5.6 V Supply current ICC 50 mA PD 280 mW Topr −20 to +75 °C Tstg −55 to +150 °C Power dissipation Operating ambient temperature Storage temperature * * 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. ■ Recommended Operating Range Parameter Supply voltage 2 Symbol Range Unit VCC 4.5 to 5.5 V ICs for TV AN8946SB ■ Electrical Characteristics at Ta = 25°C Parameter Total circuit current Symbol ITOT Conditions Min Typ Max Unit VCC = 5 V 28 34 40 mA IF amp. maximum gain GIFmax PIFIN = −60 dBm, f = 402.78 MHz V17 = 5 V 22 25 28 dB IF amp. minimum gain GIFmin PIFIN = 0 dBm, f = 402.78 MHz V17 = 0 V −29 −25 dB Loop amp. gain GLA PLA in = −30 dBm, f = 1 MHz 22 24 26 dB Video amp. gain GVA PVA in = −10 dBm, f = 1 MHz 6.5 7.0 7.5 dB f = 402.78 MHz 37 39 41 MHz/V PIFIN = −30 dBm, 100%W, weighting LPF 4.2 MHz, HPF 10 kHz 62 67 dB VCO control sensitivity Signal to noise ratio (C/N = ∞) β S/Nmax Inter-modulation interference ratio (2nd) IM2 PIFIN = −30 dBm, fC = 3.58 MHz fS = 5.7272 MHz 40 60 dB Inter-modulation interference ratio (3rd) IM3 PIFIN = −30 dBm, fC = 3.58 MHz fS = 5.7272 MHz 40 60 dB AFC dead-band width BWAFC Pin 2: Low, Pin 3: High 310 360 420 kHz AFC output maximum voltage VAFCH VCC − V3 value, f = 402.78 MHz 0 0.5 V AFC output minimum voltage VAFCL V2 value, f = 402.78 MHz 0.1 0.5 V AGC output maximum voltage 1 VAGC1H VCC − V17 value, PIFIN = −70 dBm 0 0.2 V AGC output minimum voltage 1 PIFIN = +10 dBm 0.3 0.5 V AGC output maximum voltage 2 VAGC2H VCC − V16 value, PIFIN = −70 dBm 0 0.2 V AGC output minimum voltage 2 PIFIN = +10 dBm 0.3 0.5 V VAGC1L VAGC2L AGC SW level PinSW f = 402.78 MHz, PIFM = −50 dBm Input level at V16 = 2.5 V −39 −35 −31 dBm Key pulse input maximum voltage VKEYH DC measurement 0.35 V Key pulse input minimum voltage VKEYL DC measurement 0.1 V Noise amplitude VN f = 402.78 MHz with no modulation and with de-emphasis Measure it at Video out pin. 4 10 mV[p-p] Pin 12 voltage V12 Voltage to get V17 = 0 V, V2 ≤ 1 V, V3 ≥ 4 V with no PIFIN . 1.0 1.35 1.7 V Pin 15 voltage V15 Voltage to be AFC center with no PIFIN , V17 = 0 V, fVCO = 402.78 MHz 1.03 1.15 1.27 V • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol IF amp. frequency characteristic fCIF IF amp. NF Conditions Min Typ Max Unit 3 dB down frequency 600 700 MHz NFIF f = 402.78 MHz, V17 = 5 V 12 15 dB Loop amp. frequency characteristic fCLA 3 dB down frequency 200 250 MHz Loop amp. phase PHLA f = 1 MHz to 20 MHz ±5 ±10 ° 3 AN8946SB ICs for TV ■ 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 characteristic ∆GVAF PVA in = −10 dBm, GVA = 7 dB f = 50 Hz to 10 MHz ±0.1 ±0.3 dB Video amp. phase PHVA f = 50 Hz to 10 MHz, GVA = 7 dB ±10 ±20 ° Kφ f = 402.78 MHz, PIFM = −50 dBm 80 90 100 mv/rad PD detection sensitivity PD frequency characteristic ∆KφF f = 400 MHz to 500 MHz ±10 ±20 mv/red VCO C/N C/N f = 402.78 MHz, ±50 kHz 45 48 dB IF amp. input return loss RL f = 402.78 MHz −15 −10 dB IF input level PIFIN Pin 24 input level −55 −30 −5 dBm AGC regulation ∆PIFM f = 402.78 MHz PIFIN = −50 dBm to −10 dBm ±0.5 ±1.0 dB AGC detection sensitivity ∆VAGC2 Pin 16 output sensitivity 4 5 V/dB Lock range LR PIFIN = −50 dBm to −10 dBm ±18 ±20 MHz Capture range CR PIFIN = −50 dBm to −10 dBm ±14 ±18 MHz ∆VOF f = 50 Hz to 10 MHz ±0.2 ±0.5 dB Demodulation group delay characteristic GD f = 50 Hz to 10 MHz ±5 ±10 ns Differential gain DG APL 10% to 90% 0.5 1.0 % Differential phase DP APL 10% to 90% 0.5 1.0 ° Demodulation frequency characteristic AGC SW level temperature characteristic ∆PSWT Ta = 25°C typical Ta = −10°C to +80°C ±1.0 ±2.0 dB Free-run frequency temperature characteristic ∆fOSCT Ta = 25°C typical Ta = −10°C to +80°C ±0.5 ±1.0 MHz AFC center frequency temperature characteristic ∆fAFCT Ta = 25°C typical Ta = −10°C to +80°C ±0.5 ±1.0 MHz ∆BWAFCT Ta = 25°C typical Ta = −10°C to +80°C +80 −40 +100 −50 kHz Ta = 25°C typical Ta = −10°C to +80°C ±0.5 ±1.0 dB t = 10 minutes later, referring to 3 s after VCC SW on ±0.2 ±0.5 MHz AFC dead-band width temperature characteristic IF monitor level temperature characteristic Free-run frequency SW on drift ∆PIFM ∆fOSCSW Video amp. base current I10 Pin 9 open, R10 - R11 = 100 kΩ 1.0 2.4 5.2 µA Regulator output voltage V20 VCC = 5 V 2.4 2.6 2.8 V Regulator output voltage fluctuation ∆V20 VCC = 4.5 V to 5.5 V ±5 ±15 mV 4 ICs for TV AN8946SB ■ Terminal Equivalent Circuits Pin No. Equivalent circuit 1 Description 1 1 kΩ Voltage (Open) Key pulse input • No input at receiving NTSC signal. • Input a key pulse in a direct DC connection at receiving MUSE signal. 30 mV AFC output L • Output impedance can be lowered by adding an external resistor. 0 V to 5 V AFC output H • Output impedance can be lowered by adding an external resistor. 0 V to 5 V 10 kΩ 2 10 kΩ 1 kΩ 2 200 Ω 3 10 kΩ 1 kΩ 3 200 Ω 4 VCC2 • Supply power for VCO, AFC Apply 5 V from outside 4 5 200 Ω 2 pF 10 Ω VCO1 • Connects a resonance circuit between pin 5 and pin 7. 200 Ω 2 pF 2 pF Floating 10 Ω 2 pF 2 mA 5 7 6 GND3 6 7 Same as VCO1 • GND for VCO, AFC VCO2 Apply 0 V from outside Floating • Connects a resonance circuit between pin 5 and pin 7. 5 AN8946SB ICs for TV ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit 8 Description 8 9 200 Ω Voltage (Open) GND2 • GND pin except VCO, AFC and IF amp. Apply 0 V from outside Loop amp. output • pin to drive a variable capacitance diode for VCO. 1.5 V 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 9 2 mA 10 11 1.5 V 10 100 Ω 11 11 4.2 V 10 1.5 V 500 µA 2 mA 12 20 13 kΩ 12 10 kΩ 13 kΩ 6 Free-run frequency adjustment • Changing pin 12 potential enables you to cancel an offset voltage of a loop amp. 1.3 V ICs for TV AN8946SB ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 13 Voltage (Open) 1.5 V 13 Loop amp. input 1 • Connect a lag-lead filter between pin 13 and pin 14. 1.5 V 14 Loop amp. input 2 • Connect a lag-lead filter between pin 13 and pin 14. 4.8 V 100 µA AFC adjustment • Adjust a center frequency of AFC by changing pin 15 potential. AGC output 2 • Output pin for external AGC (previous stage) 5V AGC output 1 • Filter pin for inner AGC 5V 500 Ω 1 mA 14 500 Ω 1 mA 15 200 µA 14.2 kΩ 15 200 Ω 16 20 kΩ 16 1 kΩ 17 20 kΩ 200 Ω 20 kΩ 1 kΩ 17 7 AN8946SB ICs for TV ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit 18 Description 20 18 12 kΩ 50 kΩ Voltage (Open) AGC adjustment • Inner AGC adjustment pin • Use at adjusting an IF monitor level. 1.4 V IF amp. output • Pin to check an IF amp. output level 3.3 V Regulator output • 2.6 V reference voltage output pin • Driving capability is 1 mA. 2.6 V 14 kΩ 19 150 Ω 19 500 µA 20 500 Ω 20 Approx. 900 µA 21 VCC1 • Power supply pin except VCO, AFC Apply 5 V from outside 21 22 GND1 Apply 0 V • GND for IF amp. (AGC amp., regul- from outside ator) 22 23 24 2 kΩ 24 2 kΩ 500 µA 8 15 pF 23 IF amp. input 2 • IF amp. complementary input pin • Ground in AC with an external capacitor 3.2 V IF amp. input • IF amp. input pin 3.2 V ICs for TV AN8946SB ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 25 25 10 kΩ 1 kΩ Voltage (Open) 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. 1.5 V AFC LPF2 • Construct a filter with an output impedance approximately 500 kΩ at pin 26 and an external capacitor between pin 26 and pin 27. 1.5 V 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 100 µA 26 26 500 kΩ 1 kΩ 100 µA 27 10 kΩ 500 Ω 27 200 Ω 28 Key pulse LPF • Pin to smooth a key pulse • Identifying a key pulse by this pin. 20 kΩ 0V 50 kΩ 28 1 kΩ 9 10 100 nF 27 pF MA376 39 Ω 3 pF 4 pF De-emph. LPF 560 Ω 14 DC amp. 27 pF 13 Video amp. VCO adj. 12 REG 10 kΩ IF amp. 11 10 VCO 9 Comp. GND 8 7 AGC amp. 2.7 kΩ 2 pF 10 Ω Latch 47 Ω 100 nF 100 nF 1 nF 100 pF 100 nF 100 nF 100 nF 10 kΩ AFC adj. 15 kΩ 10 kΩ 22 kΩ 15 16 17 100 pF 18 AGC adj. 19 20 21 10 nF 10 nF 10 pF 22 GND 23 24 25 26 27 28 47 Ω 1.2 kΩ 5 AFC amp. GND 6 10 Ω 4 3 2 1 Key AFC out H AFC out L Key pulse in AGC out2 AGC out1 IF monitor out 2nd IF in Keyed ident. VCC 5 V AN8946SB ICs for TV ■ Application Circuit Example 2.6 V Reg. DC amp. PD Loop amp. 1 kΩ Det. out Clamp Video out