ICs for FM/AM Tuner AN7298FBP FM-IF, NC, and MPX IC for car radio ■ Overview Unit: mm 48 13 14.2±0.4 24 0.8 37 0.3±0.1 25 12.0±0.3 36 The AN7298FBP is an IC for car radio. The FM-IF, NC (Noise Canceler) and MPX functions are integrated into a single chip. The IC has the higher functions than our conventional IC (AN7292NSC) and the characteristics of multi-pass detection, mute and SD functions are improved. 2.8±0.2 (0.55) 0.15 –0.05 +0.10 • Car radios 12.0±0.3 14.2±0.4 1.3±0.1 ■ Applications 12 1 0.1±0.1 • IF sensitivity is high. (limiting sensitivity 26 dBµ) • Adjustment-free VCO (912 kHz) • Good linearity of S-meter output (adjusting funciton) 1.3±0.1 ■ Features QFH048-P-1212 1 AN7298FBP ICs for FM/AM Tuner 25 26 27 28 29 VCC 30 31 32 33 34 35 36 GND ■ Block Diagram 37 24 2nd limiter 38 23 Quad det. AFC amp. Band det. SD IF count. 39 Reg. 40 22 21 Mute amp. 41 20 1st limiter 42 Pulse det. AGC PNL 43 18 Pilot det. 44 Vcont det. Vcont DC amp. 45 17 Pilot canceler 16 46 15 ASC .ATC stereo demod. Multipath detector 47 Divider VCO 48 14 12 11 10 9 8 7 6 5 4 3 2 13 1 2 19 ICs for FM/AM Tuner AN7298FBP ■ Pin Descriptions Pin No. Description Pin No. Description 1 ASC adjustment 25 IF detection output 2 ATC adjustment 26 PNL output hold 3 Separation adjustment 27 SD/IF counter output 4 ATC LPF 28 SD sensitivity adjustment 5 R-ch. output 29 AFC output 6 L-ch. output 30 VCC 7 Control voltage output 31 IF detection coil 8 Band mute control 32 Limiter output 9 Soft mute filter 33 Soft mute adjustment 10 Phase detection filter1 34 Stereo lamp drive 11 Forced monaural 35 2nd limiter output 12 Phase detection filter 2-1 36 GND 13 SD startup time constant setting 37 Mute adjustment 14 Phase detection filter 2-2 38 1st limiter 15 VCO 39 Reference voltage 16 Phase detection filter 3 40 1st limiter output GND 17 Pilot canceler negation filter 41 1st limiter bias 18 PNL LPF 42 IF input 19 PNL LPF 43 Mute slope adjustment 20 PNL gate pulse filter 44 Control voltage adjustment 21 PNL AGC 45 Control voltage output 22 PNL input 46 Control voltage input 23 PNL HPF 47 ASC 24 IF-counter output stop 48 Control voltage detection ■ Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Symbol Rating Unit VCC 9.7 V ICC 48 mA PD 301 mW Topr −30 to +80 °C Tstg −55 to +125 °C Note) *1 : All parameter values except for the power dissipation, the operating ambient temperature and the storage temperature are Ta = 25°C. *2 : Power dissipation of IC alone at Ta = 80°C. 3 AN7298FBP ICs for FM/AM Tuner ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 7.2 to 9.6 V ■ Electrical Characteristics at VCC = 8 V, fIN = 10.70 MHz, fmod = 1 kHz 30%FM, Ta = 25°C Parameter 4 Symbol Conditions Min Typ Max Unit Control voltage 1 VC1 Without input, pin 45 DC voltage 0.05 0.50 0.90 V Control voltage 2 VC2 VIN = 40 dBµ, pin 45 DC voltage 1.20 1.65 2.10 V Control voltage 3 VC3 VIN = 70 dBµ, pin 45 DC voltage 2.75 3.45 4.15 V Control voltage 4 VC4 VIN =100 dBµ, pin 45 DC voltage 4.45 5.35 6.25 V Control voltage 5 VC5 VC5 = VC3−VC2 1.60 1.80 2.00 V Control voltage 6 VC6 VC6 = VC4−VC3 1.70 1.90 2.10 V AFC offset voltage VAFC Without input, DC voltage between − 0.1 pin 29 and pin 39 0.0 0.1 V Output level L VOL VIN = 70dBµ, pin 6 AC voltage 90 110 130 mV[rms] Output level R VOR VIN = 70dBµ, pin 5 AC voltage 90 110 130 mV[rms] Channel balance CB CB = 20Log (VOL /VOR) −1.0 0.0 1.0 dB Limiting sensitivity Vlim VOL to 0 dB. Input when pin 6 AC voltage drops by 3 dB 20.0 26 30.0 dBµ Residual pilot voltage VPC Pin 26 output when VIN = 70 dBµ, pilot signal 10% modulation 4 14.0 mV[rms] Stereo lamp on-level LampON Modulation with pilot signal only, DC voltage of pin 34 is below 2 V 1.0 3.5 6.0 % Stereo lamp off-level LampOFF Modulation with pilot signal only. Ratio of stereo lamp on and off level 2.0 6.0 10.0 dB Separation L-ch. SepL VIN = 70 dBµ, L+R = 90% Pilot 10% 25 33 dB Separation R-ch. SepR VIN = 70 dBµ, L+R = 90% Pilot 10% 25 33 dB +0.6 −0.2 +0.8 0.4 % mV[rms] Capture range CR VIN = 70 dBµ, pilot signal 6.5% modulation Counter output level 1 VIF1 VIN = 70 dBµ, pin 28 = 0V, pin 27 10.7 MHz, output voltage 0 2.0 5.0 Counter output level 2 VIF2 VIN = 70 dBµ, pin 28 = VCC, pin 27 AC output voltage 85 100 115 mV[rms] Power supply current Itot Without input, pin 11 = 0 V 28.0 35.0 42.0 mA Monaural THD (L-ch.) THDL Monaural input 400 mV, 1kHz, L-ch. distortion 0.15 0.3 % Monaural THD (R-ch.) THDR Monaural input 400 mV, 1kHz, R-ch. distortion 0.15 0.3 % ICs for FM/AM Tuner AN7298FBP ■ Electrical Characteristics at VCC = 8 V, fIN = 10.70 MHz, fmod = 1 kHz 30%FM, Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit Stereo THD (L-ch.) THDSL Stereo, L+R = 360 mV,VP = 40 mV, L-ch. distortion 0.15 0.3 % Stereo THD (R-ch.) THDSR Stereo, L+R = 360 mV,VP = 40 mV, R-ch. distortion 0.15 0.3 % AGC voltage 1 VAGC1 Input = 0, RS = 600 Ω, pin 21 DC voltage 0.0 0.4 V AGC voltage 2 VAGC2 Input VIN2 = 2 mV[rms], 150 kHz, pin 21 DS voltage 1.3 1.48 1.65 V Noise detection voltage VDET VIN2 = 100 mV[rms],150 kHz, pin 20 DC voltage 0.0 0.3 V Gate pulse width PW VIN2 = 0.3 V[p-p], tW=1 µs, f=1 kHz, pin 26 output pulse width 19 24 29 µs Residual noise voltage VNR VIN2 =1 V[p-p], tW =10 µs, f=1 kHz, input through LPF, L-ch. output 0.0 1.2 mV[rms] SD bandwidth SDW Bandwidth when SD output (pin 27) is over 4.5 V, V28 = 2.7 V 110 140 170 kHz SD sensitivity SDS Input when SD output (pin 27) is over 4.5 V, V28 = 2.7 V 45 55 65 dBµ 5 AN7298FBP ICs for FM/AM Tuner SD output Counter output AFC output 25 26 27 28 29 30 44 17 45 16 46 15 47 14 48 13 Monaural Stereo 2 1 Forced monaural Off Band mute On L out 12 18 11 43 10 19 9 42 8 20 7 41 6 21 5 40 4 22 R out 6 31 32 33 34 39 1 Vcont 23 3 IF input 50 Ω 24 38 2 Vref 35 37 36 GND VCC (8 V) VAF (IF detection output) ■ Application Circuit Example IF counter stop