AN7298

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