ICs for FM/AM Tuner AN7233SH FM/AM Tuner for 1.5V Headphone Stereo ■ Overview Unit : mm 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. 7.80±0.20 ■ 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 0.10±0.10 + 0.10 0.2– 0.05 (0.65) 0 ~10˚ 0.5±0.20 1.20±0.20 1.55max. 6.10±0.20 8.10±0.30 + 0.10 15 0.15 – 0.05 28 0.50 SEATING PLANE SEATING PLANE 28-lead SSOP package (SSOP028-P-0300) ■ Block Diagram 28 27 AM Osc 26 25 ST Ind. 24 VCO AM Mix. Freq. Divider AM RF IF 1 2 3 4 23 22 21 20 17 16 15 AM AF Buffer AM Det. AGC PC 6 18 MPX SW LPF LEVEL Det. 5 19 7 8 SD 9 10 VCC FM Det. 11 12 GND 13 14 ICs for FM/AM Tuner AN7233SH ■ Absolute Maximum Ratings (Ta=25˚C) Symbol Rating Supply Voltage Parameter VCC 7.0 Unit V Supply Current ICC 10 mA mW Power Dissipation PD 70 Operating Ambient Temperature Topr –20 ~ + 75 ˚C Storage Temperature Tstg –55 ~ + 125 ˚C ■ Recommended Operating Range (Ta=25˚C) Parameter Symbol Range Operating Supply Voltage Range VCC 1.0V ~ 2.0V ■ Electrical Characteristics (VCC =1.2V, Ta= 25˚C±2˚C) Parameter Symbol Condition Total Circuit Current Itot (FM) No signals (under VCO operating) Output Voltage VO (FM) Limiting Sensitivity Vi (lim) min. typ. max. Unit FM S/N Ratio S/N (FM) THD THD (FM) LED ON Sensitivity Vi (FMLED1) LED Decreased Voltage ON Sensitivity Vi (FMLED2) IF Buffer Output 1 VOIF1 (FM) IF Buffer Output 2 VOIF2 (FM) Vi for VO = –3dB 5.5 7.5 9.5 mA 26 44 61 mV 38 45 48 dBµ 55 VCC=1.1V, No modulation REQ OFF VCC=1.0V, No modulation REQ OFF VIN= 80dBµ, No modulation VCC=1.0V, VIN= 80dBµ, No modulation dB 1.4 % 48 55 61 dBµ 48 58 69 dBµ 48 86 mVrms 19 mVrms AM Total Circuit Current Itot (AM) 3.0 5.0 7.0 mA Output Voltage VO (AM) 21 31 41 mV 12 24 Weak Input Detection Output Voltage VO (AMMIN) S/N Ratio S/N (AM) THD THD (AM) LED ON Sensitivity Vi (AMLED) IF Buffer Output 1 VOIF1 (AM) IF Buffer Output 2 VOIF2 (AM) AM IF Output Voltage VO (AM IF) VIN= 26dBµ mV 36 dBµ 5.0 % dB VCC=1.1 V, No modulation REQ OFF VCC=1.1V, VIN= 45dBµ, No modulation VCC=1.0V, VIN= 45dBµ, No modulation 16 23 30 29 43 57 mVrms VIN= 50dBµ, No modulation 15 15 mVrms 30 60 mVrms MPX Channel Balance CB Monaural Df= 75kHz –2 0 Separation Sep. MPX Portion only L + R= 30% 22 35 THD (Stereo) THD (STEREO) L + R= 90%, Pilot= 10% Stereo LED ON Level VP (ON) Pilot only Stereo LED OFF Level VP (OFF) Pilot only 4.8 0.8 2 dB dB 5.0 % 7.0 % 1.9 Note) FM : f = 10.7MHz, Df = 22.5kHz, fm = 1kHz, VIN = 80dBµ, AM : f = 1MHz, Mod. = 30%, fm = 1kHz, VIN = 50dBµ MPX : f = 10.7MHz, Df = 75kHz (L+ R90%, Pilot90%), fm = 1kHz, VIN = 80dBµ % ICs for FM/AM Tuner AN7233SH ■ Pin Descriptions Pin No. Pin Name Pin No. Pin Name 1 AM RF Amp. Input 15 AM Detection Pin 2 AM Mixer Output 16 AM AF Amp. Input Pin 3 Supply Pin for IF Input Portion/AMOSC Section 17 Oscillation Prevention Capacitor Pin 4 AM AGC 18 FM/AM Detection Output Pin 5 AM IF Amp. Input 19 MPX Input Pin 6 FM IF Amp. Input 20 Rch Output Pin 7 SD LED ON Level Adjustment 21 Lch Output Pin 8 Stereo LED Drive/AMIF Output Pin 22 AM/FM Changeover/19kHz Output Pin 9 SD LED Drive Pin 23 Loop Filter Pin 1 for PLL 10 Supply Pin 24 Loop Filter Pin 2 for PLL 11 Phase-Shifter Pin for FM Detection 25 CR Connecting Pin for VCO 12 GND Pin 26 13 Output for FM/AM IF Count 27 Low Pass Filter Pin 1 for Pilot Detection Low Pass Filter Pin 2 for Forced MONO/Pilot Detection 14 IF Count Control Pin 28 AM Local Oscillation Coil Pin 100kΩ 100kΩ 8200pF 8200pF 4.7µF V MONO. IF 82pF 17 0.047µF 0.022µF 18 16 15 AM AF Buffer MPX SW AM Det. AGC 6 7 8 9 10 11 3.3kΩ 270pF 12 13 14 REQ 1kΩ 1kΩ ST + FM Det. SD 0.01µF 5 SFE10.7MA5 1mH + 19 LEVEL Det. SFU450314 4 4.7µF 3 20 0.022µF 0.01µF AM RF 21 CDA10.7MG PC 0.033µF 2SC1359 3V 100Ω 2SC1359 4.3kΩ 1.8kΩ 2SK192A 0.022µF 390Ω 50Ω AMIF 510kΩ FMSG 510kΩ IF Count 280Ω 50Ω VCC 39pF Divider 22 220kΩ AM Mix. 2 6.2kΩ 6.2kΩ 23 SD ST Ind. 24 0.01µF 25 LPF 1 0.33µF STEREO SG 1kΩ 0.1µF VCO 0.022µF 50Ω 680pF 10kΩ 15kΩ 26 AM OSC 24kΩ 51.7kΩ 27 1µF + 28 + + 10pF AM 0.22µF 4.7kΩ 470kΩ RLO2U8 – M KV1281 AMSG Audio Analazer MPX Fillter + Freg. Counter Tuning Electric Current V1 4.7µF + ■ Application Circuit V RF Voltage Meter