ICs for FM/AM Tuner AN7223 AM Tuner, FM/AM IF Amplifier Circuit for Radio Cassette Recorder ■ Overview Unit : mm (FM/AM common use) • AM : High sensitivity,including RF amplifier • Low power consumption • Muting control • AFC control • Fewer external parts • High stability on both AM and FM • Low shock noise level from function switch operation • SW band available (f= 30MHz) 18 2 17 3 16 4 15 5 14 6 13 7 12 8 11 9 10 2.54 21.7±0.3 ■ Features • Wide operating supply voltage range : VCC= 2.8V~12V • Incorporating both FM and AM detectors • Incorporating a level indicator output 1 0.5±0.1 1.2±0.25 The AN7223 is an IC designed for high-class radio cassette recorder with multifunctioned FM/AM IF system. 0.51min. 6.3±0.25 3.8±0.25 (3.45) + 0.1 5 0.2 0.3 – 3 ~ 15˚ 7.62±0.25 18-Lead DIP Package (DIP018-P-0300E) ■ Block Diagram 8 9 12 14 VCC 1 7 AM/FM IF Amp. FM IF Amp. FM Quad. Det. Mute Det. 17 16 Mute or Shock Noise Canceller Level Meter AF Amp. 13 15 4 3 AM RF Amp. AM Mixer 5 AM L Osc. AGC 18 6 AM Det. 2 VCC (AM) 10 11 GND ICs for FM/AM Tuner AN7223 ■ Pin Descriptions Pin No. Pin Name Pin No. Pin Name 1 FM IF Amp. Input 10 AM Detection Output 2 VCC (AM) 11 GND 3 AM RF Amp. Input 12 FM Detector Coil 4 AM Mixer Output 13 AF Output 5 AGC Output (2) 14 VCC 6 AGC Output (1) 15 Level Meter Output 7 AM IF Amp. Input 16 AFC Output 8 IF By-pass 17 Reference Voltage 9 IF By-pass 18 Local Oscillation ■ Absolute Maximum Ratings (Ta=25˚C) Parameter Symbol Rating Unit Supply Voltage VCC 14.4 V Power Dissipation PD 317 mW Operating Ambient Temperature Topr –20 ~ + 75 ˚C Storage Temperature Tstg –55 ~ + 150 ˚C ■ Electrical Characteristics (VCC =5V, Ta= 25˚C) Parameter Symbol Total Circuit Current Itot Demodulation Output Level FM Limiting Sensitivity Vi Muting Sensitivity Signal Meter Driving Output 1 Signal Meter Driving Output 2 Vi (mute) Total Circuit Current Itot Detection Output Level AM υO (FM) Max.Sensitivity Signal Meter Driving Output 1 Signal Meter Driving Output 2 (lim) V15 V15 υO (AM) Smax. V15 V15 Condition (DC measurement) Vi= 80dBµ, f=10.7MHz, fdev.= 22.5kHz, fm= 400Hz Input at υO= –3dB Input at υO= less than –20dB Vi= 50dBµ, f=10.7MHz, fdev.= 22.5kHz, fm= 400Hz Vi= 80dBµ, f= 10.7MHz, fdev.= 22.5kHz, fm= 400Hz (DC measurement) Vi= 80dBµ, f= 1MHz, Mod.= 30%, fm= 400Hz Input at υO= 10mV Vi= –10dBµ, f= 1MHz, Mod.= 30%, fm= 400Hz Vi= 80dBµ, f= 1MHz, Mod.= 30%, fm= 400Hz min. typ. max. Unit 9 14 20 mA 75 100 125 mV 41.5 44.5 47.5 dBµ 45 50 59 dBµ 120 600 1150 mV 1.14 1.26 1.42 V 8 13 19 mA 60 80 100 mV 4.5 9.5 12.5 dBµ 130 mV 1.38 V 0 1.12 1.25 ICs for FM/AM Tuner AN7223 ■ Application Circuit 4 1 18 100µF 470Ω 17 16 15 14 27kΩ T1 1 VO (FM.AM) 0.01µF – 0.0047 µF + 2.2kΩ – 0.022µF – 47µF – 5.1kΩ 6 + + 10µF 3 + VCC (5V) – V15 22µF 47pF T2 47Ω + 100µF 0.022µF 0.022µF FM AM 0.022µF 13 12 11 10 6 7 8 9 3 4 5 2.1kΩ 3 10kΩ 1 + + – – 0.02µF 2 100µF 1 4.7µF AN7223 4 0.02µF to Front End 47pF 6 T3 Mute ON OFF ■ Coil Specifications Symbol T1 T2 T3 Use, Freq Type No. 3 FM Quad. Coil 10.7MHz EIF– 7S752A AM MW Osc. Coil ELL– 7S754 AM Mix. Output 455kHz Connection Diagram Maker EIA– 7S802A MATSUSHITA MATSUSHITA MATSUSHITA 4 2 1 6 3 4 2 1 6 3 4 2 1 6 Number of Turns 1 – 2 8T 2 – 3 5T 4 – 6 3T Tuning Cap. Unloaded Q 100pF 90±20% 1 – 2 4T 2 – 3 125T 4 – 6 7T 3 – 2 35T 6 – 4 10T 2 – 1 19T 95±20% 1500pF 60±30% ■ Ceramic Filter Specification Symbol Use Type No. Maker Center Freq. Band Width Loss CF1 AM IF CFM2 – 455B TOKO 455kHz 7kHz (–6dB) 2.6dB