ICs for FM/AM Tuner AN7289NSC FM-FE+AM IC for car radio ■ Overview Unit: mm The AN7289NSC is an IC having FM-FE+AM functions for car radio. A tuner block of car radio can be constructed by combination of this IC and the AN7293NSC / NFBQ. 17.81±0.3 17 1 16 7.2±0.3 9.3±0.3 32 0.3 ■ Features 0.35±0.1 1.23 1.0 Seating plane 0.15 0.1±0.1 0.9 2.0±0.2 • A less number of electrolytic capacitors is required (3 capacitors reduction compared with our conventional IC) • AM: Practical sensitivity is improved by 2 dB by ATC • AM: Strong input characteristics is improved by 2-loop AGC function SSOP032-P-0375 ■ Applications • Car radios FM/AM SW AM RF-AGC 14 13 12 11 10 AM IF-amp. 9 8 FM IF-amp. GND1 VCC 7 AM SSC 6 AM det. 5 4 3 2 1 AM IF-AGC 17 AM mix. AM.S-meter AM ATC 18 19 20 21 22 23 25 24 FM mix. 16 FM AGC 26 27 28 29 AM OSC 15 FE OSC 30 31 32 GND2 ■ Block Diagram 1 AN7289NSC ICs for FM/AM Tuner ■ Pin Description Pin No. Description Pin No. Description 1 FM-keyed-AGC input 18 FM-IF input 2 AM-AF output / LO setting 19 AM-RF gain control 3 AM-ATC input 20 AM-mix. input 4 AM-IF level detection 21 FM-PIN-diode driver 5 AM detection output 22 AM-OSC coil pin 6 VCC1 23 FM-mix. output (2) 7 AM-IF counter output / DX / LO SW 24 FM-mix. output (1) 8 AM-SD output 25 FM-PIN-diode driver 9 AM-signal meter output 26 FM-mix. input 10 FM-IF output 27 VCC2 / FM / AM SW 11 AM-IF output 28 FM-AGC output 12 GND1 29 FM-OSC buffer output 13 SSC 30 AM-OSC buffer output / FE-AGC 14 AM-RF level detection 15 AM-WAGC detection / DX setting 31 GND2 16 AM-IF input 32 FM-OSC coil pin 17 AM-mix. output sensitivity setting ■ Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Symbol Rating Unit VCC 9.1 V ICC 56 mA PD 380.2 mW Topr −35 to +80 °C Tstg −55 to +125 °C Note) *1 : Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C. *2: Ta = 80°C ■ Recommended Operating Range Parameter Supply voltage 2 Symbol Range Unit VCC 7.2 to 9.0 V ICs for FM/AM Tuner AN7289NSC ■ Electrical Characteristics at Ta = 25°C 1. AM mode VCC = 8.0 V, fIN = 1 MHz AM tuning condition: OSC output frequency = 1 450 kHz ±500 Hz Parameter Symbol Conditions Min Typ Max Unit AM consumption current amIt1 Without input 28 36 44 mA AM-AF output amVO AM-AF output at VIN2 = 74 dBµ, 400 Hz 30% 100 125 155 mA AM signal-to-noise ratio amSN AM-AF output S/N at VIN2 = 74 dBµ, 400 Hz 30% 48 52 58 dB AM-AGC width amW AM-AF output when input changes −10 dB at VIN2 = 74 dBµ, 400 Hz 30% 55 59 63 dB amATC (Output ratio [dB] of 400 Hz and 3 kHz when VIN2 = 18 dBµ) − (Output ratio [dB] of 400 Hz and 3 kHz when VIN2 = 74 dBµ) 80% Mod., AM-AF Out output 3.5 6.5 9.5 dB AM-ATC operation AM-distortion 1 amT1 VIN2 = 74 dBµ 400 Hz 80% AM-AF output distortion 0.01 0.5 1.5 % AM-distortion 2 amT2 VIN2 = 130 dBµ 400 Hz 80% AM-AF output distortion 0.01 0.5 1.5 % AM wide band AGC on input amVW fIN2 = 1.4 MHz Input when pin 15 voltage becomes below 3 V 97 103 109 dBµ AM local oscillation buffer output amVOS Without input 160 210 260 mV AM-IF count output 1 amIF1 VIN2 = 40 dBµ 150 210 270 mV AM-IF count output 2 amIF2 Without input 10 mV AM-SD output 1 amSD1 VIN2 = 40 dBµ 4.5 4.9 5.1 V AM-SD output 2 amSD2 Without input 0.0 0.2 0.5 V AM signal meter output 1 amVS1 Without input, pin 9 voltage 1 50 200 mV AM signal meter output 2 amVS2 Pin 9 voltage at VIN2 = 30 dBµ 0.7 0.95 1.2 V AM signal meter output 3 amVS3 Pin 9 voltage at VIN2 = 130 dBµ 4.1 4.8 5.1 V AM search sensitivity DX amDX AM-IF count output is 120 mV or over VIN2 when f becomes 450 kHz ±2 kHz 24 30 36 dBµ AM search sensitivity LO amLO AM-IF count output is 120 mV or over VIN2 when f becomes 450 kHz ±2 kHz 44 50 56 dBµ 3 AN7289NSC ICs for FM/AM Tuner ■ Electrical Characteristics at Ta = 25°C (continued) 2. FM mode VCC = 8.0 V, fIN1 = 98 MHz FM tuning condition: OSC output frequency = 108.7 MHz ±10 kHz Parameter Symbol FM local oscillation buffer output fmVOS Conditions Min Typ Max Unit fOSC = 108.7 MHz without input 140 200 260 mV VIN1 = 71 dBµ 50 95 140 mV FM-IF output level fmIF FM-AGC sensitivity fmAGC VIN1 level when V28 becomes 3 V 59 63 67 dBµ FM-AGC voltage (high) fmVaH VIN1 = 70 dBµ V28 6.0 6.4 6.8 V FM-AGC voltage (low) fmVaL VIN1 = 82 dBµ V28 0.05 0.5 V FM consumption current fmIt Without input 26 35 44 mA AM-ANT ■ Application Circuit Example VfOSC VaOSC FM-Pin D FM-AGC FM-MIX In AM-VT AM RF-AGC FM IF-amp. 14 13 12 11 10 AM IF-amp. 9 8 AM SSC 7 6 AM det. 5 4 3 2 1 AM IF-AGC 17 AM mix. AM.S-meter AM ATC 18 19 20 21 22 23 25 24 FM mix. FM/AM SW 16 FM AGC 26 27 28 29 AM OSC 15 FE OSC 30 31 32 FE-VT 5V KEYED-AGC In 4 FM-IF Out AM-SD Out AM-S.Meter AM-IF Count AM-AF Out VCC