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| ICs for FM/AM Tuner AN7233SH FM/AM Tuner for 1.5V Headphone Stereo s Overview The AN7233SH is an IC for tuner of 1.5V headphone stereo. It incorporates AM tuner + FM IF + FM detector + FM MPX and has been provided with the station detection function and IF count output function required to support DTS, and the AM IF output function required to support AM stereo. It is included in the 28-lead SSOP package with 0.5mm pitch. 7.800.20 28 15 + 0.10 Unit : mm 6.100.20 8.100.30 0.15 - 0.05 0 ~10 0.50.20 s Features * Low voltage operation : VCC=1.0V or more * AM tuner/FM IF + FM detection + FM MPX : one chip * DTS supported * AM stereo support possible * Adjustable sensitivity for station detection * Small package 1 14 0.2- 0.05 (0.65) 0.50 0.100.10 16 + 0.10 1.200.20 1.55max. SEATING PLANE 15 AM AF Buffer 13 14 SEATING PLANE 28-lead SSOP package (SSOP028-P-0300) s Block Diagram 28 27 26 25 24 23 22 21 20 19 18 17 AM Osc ST Ind. VCO LPF MPX SW AM Mix. Freq. Divider PC AM Det. AGC AM RF IF LEVEL Det. SD FM Det. 1 2 3 4 5 6 7 8 9 10 VCC 11 12 GND AN7233SH 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 7.0 10 70 -20 ~ + 75 -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 1.0V ~ 2.0V s Electrical Characteristics (VCC =1.2V, Ta= 25C2C) Parameter FM Total Circuit Current Output Voltage Limiting Sensitivity S/N Ratio THD LED ON Sensitivity LED Decreased Voltage ON Sensitivity IF Buffer Output 1 IF Buffer Output 2 AM Total Circuit Current Output Voltage Weak Input Detection Output Voltage S/N Ratio THD LED ON Sensitivity IF Buffer Output 1 IF Buffer Output 2 AM IF Output Voltage MPX Channel Balance Separation THD (Stereo) Stereo LED ON Level Stereo LED OFF Level CB Sep. THD (STEREO) VP (ON) VP (OFF) Monaural Df= 75kHz MPX Portion only L + R= 30% L + R= 90%, Pilot= 10% Pilot only Pilot only 0.8 4.8 1.9 -2 22 0 35 5.0 7.0 2 dB dB % % % Itot (AM) VO (AM) VO (AMMIN) S/N (AM) THD (AM) Vi (AMLED) VOIF1 (AM) VOIF2 (AM) VO (AM IF) VCC=1.1 V, No modulation REQ OFF VCC=1.1V, VIN= 45dB, No modulation VCC=1.0V, VIN= 45dB, No modulation VIN= 50dB, No modulation 16 29 15 15 30 23 43 VIN= 26dB 3.0 21 12 36 5.0 30 5.0 31 24 7.0 41 mA mV mV dB % dB Itot (FM) VO (FM) Vi (lim) S/N (FM) THD (FM) Vi (FMLED1) Vi (FMLED2) VOIF1 (FM) VOIF2 (FM) VCC=1.1V, No modulation REQ OFF VCC=1.0V, No modulation REQ OFF VIN= 80dB, No modulation VCC=1.0V, VIN= 80dB, No modulation 48 48 19 55 58 48 Vi for VO = -3dB No signals (under VCO operating) 5.5 26 38 55 1.4 61 69 7.5 44 45 9.5 61 48 mA mV dB dB % dB dB Symbol Condition min. typ. max. Unit 86 mVrms mVrms 57 mVrms mVrms 60 mVrms Note) FM : f = 10.7MHz, Df = 22.5kHz, fm = 1kHz, VIN = 80dB, AM : f = 1MHz, Mod. = 30%, fm = 1kHz, VIN = 50dB MPX : f = 10.7MHz, Df = 75kHz (L+ R90%, Pilot90%), fm = 1kHz, VIN = 80dB ICs for FM/AM Tuner s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name AM RF Amp. Input AM Mixer Output Supply Pin for IF Input Portion/AMOSC Section AM AGC AM IF Amp. Input FM IF Amp. Input SD LED ON Level Adjustment Stereo LED Drive/AMIF Output Pin SD LED Drive Pin Supply Pin Phase-Shifter Pin for FM Detection GND Pin Output for FM/AM IF Count IF Count Control Pin Pin No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin Name AM Detection Pin AM AF Amp. Input Pin Oscillation Prevention Capacitor Pin FM/AM Detection Output Pin MPX Input Pin Rch Output Pin Lch Output Pin AM/FM Changeover/19kHz Output Pin Loop Filter Pin 1 for PLL Loop Filter Pin 2 for PLL CR Connecting Pin for VCO Low Pass Filter Pin 1 for Pilot Detection Low Pass Filter Pin 2 for Forced MONO/Pilot Detection AM Local Oscillation Coil Pin AN7233SH s Application Circuit Tuning Electric Current 470k V1 4.7F + 8200pF 8200pF Freg. Counter MPX Fillter 100k 4.7F 100k Audio Analazer V + RLO2U8 - M MONO. 10k 15k 0.22F 82pF 6.2k 6.2k 0.047F 0.33F STEREO SG + AM 24k VCC 0.022F 0.022F 680pF KV1281 10pF 1F + 0.1F 1k + 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AM OSC ST Ind. VCO LPF MPX SW AM AF Buffer AM Mix. Divider PC AM Det. AGC AM RF IF LEVEL Det. SD FM Det. 1 AMSG 50 50 1mH 0.022F 2 3 4.7F + 4 5 SFU450314 6 SFE10.7MA5 7 8 9 0.01F 10 11 3.3k 270pF 220k CDA10.7MG 12 13 0.01F 14 0.01F + 51.7k REQ 1k 1k SD ST IF Count 280 510k 2SK192A 4.3k 39pF 3V 2SC1359 100 2SC1359 0.033F 4.7k FMSG 50 0.022F AMIF 510k 390 1.8k V RF Voltage Meter |
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