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| ICs for FM/AM Tuner AN7243S FM Front-end Circuit for Car Radio s Overview The AN7243S is an FM front-end IC designed for DTS except RF amp. of car radio. It is built-in local oscillation frequency buffer output and PIN diode (ADX) driver for antenna damping. Unit : mm 0.40.25 1.24 temper- 0.3 4.20.3 6.50.3 14-Lead SOP Package (SOP014-P-0225) s Block Diagram GND 14 13 12 11 10 9 8 ADX Driver Mix. IF-Amp. Buffer OSC AGC & Det. Buffer 1 2 3 VCC 4 5 6 7 0.15 0.65 ature characteristics to RF amp. 1.50.2 s Features * High sensitivity * High S/N ratio * Good IM characteristics at strong input * Timing for AGC input level is variable. * Built-in pre-IF-Amp. having negative (positive) 0.10.1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 10.10.3 1.27 AN7243S s Absolute Maximum Ratings (Ta=25C) Parameter Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC ICC PD Topr Tstg Rating 9.6 50 380 -40 ~ + 80 -55 ~ + 125 ICs for FM/AM Tuner Unit V mA mW C C s Recommended Operating Range (Ta=25C) Parameter Operating Supply Voltage Range Symbol VCC Range 6.5V ~ 9.6V s Electrical Characteristics (VCC = 8V, fin = 98MHz, 400Hz 30%Modulation, S1 : Open, Ta= 25C) Parameter S/N Ratio Local Oscillation Output Level IF Output Level AGC Maximum Sensitivity AGC Level (L) AGC Level (H) AGC Sensitivity Variable Range ADX Drive Current ADX Leak Current IX(max.) IX(leak) Symbol NOUT VOSC VOUT SAGC VAGC(L) VAGC(H) Condition Vin =17dB no conversion However, S= output at 400Hz 30%conversion fOSC =108.7MHz Measured by Pin4, No signal No modulation, Vin = 53dB Input level at VAGC = 3V Vin = 72dB Vin = 58dB At S1ON, difference between input level at VAGC = 3V and AGC maximum sensitivity Vin = 72dB Vin = 63dB 6 18 20 1 min. 22 160 41 60 typ. 30 250 58 65 0.02 6.6 330 82 70 0.5 max. Unit dB mV mV dB V V dB mA A s Characteristics Curve IF - Amp. Input/Output Characteristics 10 120 20 8 6.6V IF OUT (dB) Itot (mA) IAGC (V) 15 100 6 Itot - VCC 25 AGC Start Point Variable Axis 10 80 4 AGC Adj. R = 0 AGC Adj. R = 5 60 0 0.01F IF IN AN7243S 0.01F IF OUT 2 330 0 2 4 6 VCC (V) 8 10 12 40 60 80 IF IN (MHz) 100 120 0 0 10 60 70 80 90 100 110 Vin (dB) ICs for FM/AM Tuner AN7243S AGC Freq. Characteristics 120 fOSC =108.7MHz 110 85 AGC Adj. R - AGC ON Level 8 7 6 IADX - VADX 100 AGC ON LEVEL (dB) AGC Start Point (dB) 5 VADX (V) 50 +75 AN7243S 103 AGC Adj. R 90 75 4 3 2 80 70 65 60 88 92 96 100 104 108 0 10 1 0 100 1000 0 5 10 15 20 25 30 35 Input Frequency fin (MHz) AGC Adj R () IADX (mA) OSC OUT - fOSC 130 VCC =8V Input 115dBV from SG to Pin2 Pin3 OPEN C =3pF 120 C =10pF OSCOUT (dB) AN7243S 2 3 VAGC (H) Supply Voltage Characteristics 16 14 OSC OUT IF Amp. Saturation Level 400 0.01F SG C 12 10 8 6 4 2 100 Saturation Level (mVrms) 4 6 8 10 12 14 300 110 VAGC (H) (V) 200 100 90 50 0 60 70 80 90 100 110 120 130 fOSC (MHz) 2 4 6 8 10 12 14 VCC (V) VCC (V) Mixer + IF Amp. Total Gain Temperature Characteristics 4 3 2 1 DTotal G (dB) 0 -1 -2 -3 -4 -5 -6 -60 -40 -20 0 20 40 60 80 100 50 -60 -40 -20 0 20 40 60 80 100 2 4 6 8 10 12 14 16 60 Vin (dB) 80 Vin (dB) VCC =8V Total Gain =0dB at Ta =25C 100 90 90 AGC ON LEVEL R Adj = 85 80 75 70 65 60 AGC ON LEVEL R Adj = 0 AGC ON LEVEL R Adj = AGC ON Level Temperature Characteristics AGC ON Level VCC Dependence 70 AGC ON LEVEL R Adj = 0 T (C) T (C) VCC (V) AN7243S OSC Buff OUT VCC Dependence Input/Output Characteristics Example (0.2061V) 0 120 -10 -20 Vin (dB) OSC Buff OUT 110 Vo (dB) -30 -40 30 ICs for FM/AM Tuner Limiting Sensitivity, Usable Sensitivity VCC Dependence IF : AN7257S Vin (dB) VCC = 8V fin= 98MHz fm = 1kHz, 30% Mod. 400Hz HPF 30kHz LPF ON 20 Usable Sensitivity 100 -50 -60 90 -70 -10 0 10 Limiting Sensitivity 2 4 6 8 10 12 14 16 20 40 60 80 100 2 4 6 8 10 12 14 16 VCC (V) Vin (dB) VCC (V) Limiting Sensitivity, Usable Sensitivity, Temperature Characteristics 20 IF : AN7257S 40 Limiting Sensitivity, Usable Sensitivity, Frequency Characteristics 110 IM Characteristics (1) fD= 98MHz, CW fUD1= 98MHz + fUD 1kHz, 30% Mod. fUD2= 98MHz + 2fUD, CW 100dB Measure SUD1 level (Referred to Mix. In) which can obtain S/N= 30dB IF is AN7257S Usable Sensitivity 15 30 SUD1 (dB) Vin (dB) Vin (dB) 100 90 SD = 45dB SD = 35dB 80 20 Usable Sensitivity 10 10 Limiting Sensitivity Limiting Sensitivity 5 70 Sp 0.01F AN 7243S 0 -60 -40 -20 0 20 40 60 80 100 0 88 92 96 100 104 108 -5 -4 -3 -2 -1 0 SUD1 SUD2 1 2 Mixer 3 4 5 T (C) fin (MHz) fUD (MHz) IM Characteristics (2) 130 120 110 100 90 SD (dB) 80 70 60 50 40 30 20 10 0 60 70 80 50 Sp SUD1 SUD2 1F : 7256S 5075 AN 0.01F 7243S To 1F fD =98MHz, CW fUD1=98MHzfUD 1kHz, 30%Mod. fUD2=98MHz2fUD, CW 400HzHPF, 30kHz LPF ON IFT- CF Matching R To IFT 330 To CF 470 Set SUD1 and SUD2 up with the same level, Measure SD level (Referred to Mix. In) which can obtain S/N (30dB). fUD = + 400Hz, + 800Hz fUD = - 400Hz, + 800Hz 90 100 110 120 130 SUD1, SUD2 (dB) Mixer IFT : 7E7137A (MATSUSHITA) 330 470 ICs for FM/AM Tuner s Application Circuit 2.2F 2k 4pF IFT 12 11 10 9 14 13 22 47k 3SK181 18pF 1000pF 0.01F VCC (8V) 8 680 ANT. 100k 470pF 100pF 470pF 510 VC2 100k VC1 100k 39pF 100k 5pF 39pF 0.01F 1 2 3 4 47k 470pF 18pF AN7243S 1000pF 5 6 7 Pin Diode AGC Adj. IF OUT 1F 20k OSC OUT VVC VC3 Note) VC1 ~ VC3 TOKO KV1340A-3 Above application circuit and circuit constant indicate only an example. It is not assure the design as mass production set. AN7243S AN7243S s Pin Descriptions Pin No. 1 Pin Name Oscillation Emitter Typ. Waveform Description Oscillation transistor's emitter pin 108.7MHz ICs for FM/AM Tuner Equivalent Circuit 2 1 2 Oscillation Base 108.7MHz Oscillation transistor's base pin 3 VCC DC 8V Main circuit VCC VCC 4 OSC Output 108.7MHz Output oscillation signal to microcomputer through buffer. 4 6.6V 70A 5 AGC Output 0V Output AGC signal according to Mix. output dimensions. 5 6 AGC-Amp. Gain Adjustment DC 0.8V Adjust AGC-Amp. gain by external resistance. (Refer to P.275 AGC circuit.) 6 7 IF Amp. Output 10.7MHz IF signal (10.7MHz) output pin Zout 330 + - 7 8 IF Amp. By-pass DC 3.2V IF amp. by-pass control 9 330 8 9 IF Amp. Input 10.7MHz IF signal (10.7MHz) input pin 10 Mix. Output 11 10 10.7MHz 11 Convert RF signal to IF signal and output. 10.7MHz Note) Typical waveform frequency is the value when tuning receiving frequency to 98.0MHz. ICs for FM/AM Tuner s Pin Descriptions (Cont.) Pin No. Pin Name Typ. Waveform 7.2V AN7243S Description Drive PIN diode for input attenuate of RF-Amp. Determine drive current by Pin12 external resistance. Equivalent Circuit VCC 12 PIN Diode Driver Output .0V 12 2.2k 13 Mix.Output RF Input signal from RF Amp. 13 2.2k 14 GND Main circuit GND Note) Typical waveform frequency is the value when tuning receiving frequency 98.0 MHz. s Supplementary Explanation * AGC AGC used at the AN7243S uses mixer output (IFT primary side) signal and controls AGC output. IFT RF Amp. Mixer IF - Amp. AGC Amp. 6 RAdj. (SAGC variable) - 12 + AGC Det. V5, V12 -VIN (RF) 8 7 AGC Voltage (V) 6 5 4 3 2 1 0 V12 Variable V5 VCC= 8V SAGC VIN (RF) (dB) |
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