ICs for FM/AM Tuner AN7293NSC FM-IF, NC, MPX IC for car radio ■ Overview Unit: mm The AN7293NSC is an IC having FM-IF, NC and MPX functions for car radio. A tuner block of car radio can be constructed in combination with the AN7289NFBQ/ NSC. Small outline package product (the AN7293NFBQ) is also available. 1 16 7.2±0.3 17 0.3 ■ Features 9.3±0.3 17.81±0.3 32 0.35±0.1 1.0 Seating plane 0.15 0.9 1.23 0.1±0.1 2.0±0.2 • A less number of external components is required (8 components reduction compared with our conventional IC) • Neighbouring-station interference characteristics improvement by band-ATC function • Band-mute on/off function SSOP032-P-0375 ■ Applications • Car radios 17 18 19 20 21 22 VBAND IF-Count./ST-Ind./SD 23 24 AFC 25 VCC 26 27 28 29 30 31 32 IF In GND ■ Block Diagram VREF Noise det. 16 15 14 13 11 10 VCO PLL L-Out 9 8 7 Sep. Adj. 6 PNL Pilot det. Demod. ATC Adj. 5 Forced Mono 4 Multipath det. 3 2 S-Meter S-Meter Adj. 1 Level det. SD, IF counter Band Mute Mute 12 IF det. R-Out IF limiter 1 AN7293NSC ICs for FM/AM Tuner ■ Pin Description Pin No. Description Pin No. Description 1 Control voltage adjustment 17 Band signal output/band mute SW 2 Control voltage 18 PNL low-pass filter 3 Multiple-path noise input 19 PNL AGC 4 Multiple-path detection 20 PNL input 5 ASC adjustment/forced monaural 21 Detection output 6 ATC adjustment 22 PNL output hold 7 Separation adjustment 23 SD/FM-IF counter output/stereo indicator 8 ATC low-pass filter 24 SD sensitivity adjustment 9 R-channel output 25 AFC voltage 10 L-channel output 26 VCC 11 Mute voltage 27 FM detection 12 Pilot detection low-pass filter 28 Soft mute adjustment 13 PLL low-pass filter 29 GND 14 PLL low-pass filter 30 VREF 15 VCO 31 IF bypass 16 Pilot cancel control low-pass filter 32 IF input ■ Absolute Maximum Ratings Parameter Symbol Rating Unit VCC 9.1 V ICC 45 mA PD 380.2 mW Topr −30 to +80 °C Tstg −55 to +125 °C Supply voltage Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Note) *1: Ta = 25°C except power dissipation, operating ambient temperature and storage temperature. *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 AN7293NSC ■ Electrical Characteristics at Ta = 25°C Unless otherwise specified, VCC = 8V, VIN1 is f = 10.70 MHz, Mod. = 1 kHz, 30% FM modulation stereo input is L + R = 90% VP = 10% Parameter Symbol Conditions Min Typ Max Unit Control voltage (1) VC1 Without signal input, pin 2 DC voltage 0.0 0.3 0.9 V Control voltage (2) VC2 VIN1 = 40 dBµ, pin 2 DC voltage 0.7 1.2 1.7 V Control voltage (3) VC3 VIN1 = 70 dBµ, pin 2 DC voltage 2.5 3.2 3.9 V Control voltage (4) VC4 VIN1 = 100 dBµ, pin 2 DC voltage 4.5 5.3 5.8 V Control voltage (5) VC5 VC5 = VC3 − VC2 1.8 2.0 2.2 V Control voltage (6) VC6 VC6 = VC4 − VC3 1.9 2.1 2.3 V Output level L-channel VOL VIN1 = 70 dBµ, pin 10 AC voltage 85 105 125 mV[rms] Output level R-channel VOR VIN1 = 70 dBµ, pin 9 AC voltage 85 105 125 mV[rms] Channel balance CB CB = 20·log (VOL/VOR) −1.0 0 1.0 dB Residual pilot voltage VPC VP = 10% modulation, VIN1 = 70 dBµ, pin 22 output voltage 4 14 mV[rms] LAMPON 19 kHz modulation, Modulation factor at which pin 23 becomes under 1 V 1.3 4.0 6.3 % L+R = 90%, VP = 10% Larger separation value after changing over pin 7 external resistor 25 33 dB 25 33 dB Modulation at VP = 6.5% Referred to 19 kHz ±0.4 ±0.7 % Stereo lamp turn-on level Separation L-channel SepL Separation R-channel SepR Capture range CR Counter output level (1) VIF1 VIN1 = 100 dBµ, V24 = 2 V pin 23 output voltage 120 140 160 mV[rms] Counter output level (2) VIF2 VIN1 = 100 dBµ, V24 = 5 V 0 2 5 mV[rms] pin 23 output voltage Monaural THD (L) THDL VIN2 monaural input, 500 mV[0-p] 1 kHz, L-ch. output distortion factor 0.1 0.3 % Monaural THD (R) THDR VIN2 monaural input, 500 mV[0-p] 1 kHz, R-ch. output distortion factor 0.1 0.3 % Stereo THD (L) THDSTL VIN2 stereo input, 500 mV[0-p] 1 kHz, L-ch. output distortion factor 0.1 0.3 % Stereo THD (R) THDSTR VIN2 stereo input, 500 mV[0-p] 1 kHz, R-ch. output distortion factor 0.1 0.3 % PNL-AGC voltage (1) VAGC1 VIN2 = Without input pin 19 DC voltage 1.2 1.4 1.7 V PNL-AGC voltage (2) VAGC2 Input VIN2 = 100 mV, f = 100 kHz Difference from VAGC1 0.1 0.35 0.60 V Residual noise voltage VNR VIN2 = (pulse width 10 µs, 1 V[p-p] 1 kHz), L-ch. output 0.0 0.2 0.7 mV[rms] 3 AN7293NSC ICs for FM/AM Tuner ■ Electrical Characteristics at Ta = 25°C Unless otherwise specified, VCC = 8V, VIN1 is f = 10.70 MHz, Mod. = 1 kHz, 30% FM modulation stereo input is L + R = 90% VP = 10% Parameter Symbol Conditions Min Typ Max Unit SD sensitivity SDS VIN1 when V24 = 2 V, V23 > 2 V 68 78 88 dBµ SD bandwidth SDW VIN bandwidth when V24 = 2 V, and V23 > 2 V, VIN1 = 100 dBµ 100 130 160 kHz Supply current ITOT Without input 30 37 44 mA Limiting sensitivity VLIM VIN1 input level when pin 9 AC voltage drops by 3 dB 24 32 38 dBµ ATC VATC L-ch. output ratio when V6 = 2 V and 0 V 6 10 14 dB VIN2 = (pulse width 1 µs, 0.3 V[p-p] 1 kHz) pin 22 output pulse width 16 23 30 µs Min Typ Max Unit 2.0 6.0 10.0 dB − 0.1 0.0 0.1 V Gate pulse width PW • Design reference data Note) The following characteristics are the reference values for design and not guaranteed values. Parameter Stereo lamp turn-off level AFC offset voltage 4 Symbol Conditions LAMPOFF Ratio between the modulation factor when pin 23 becomes 2 V or higher and LAMPON VAFC Without signal input, DC potential difference between pin 25 and pin 30 ICs for FM/AM Tuner AN7293NSC 100 µF VBAND IF-Counter ST-Indicator SD VCC ■ Application circuit Example 470 pF 19 0.47 µF 330 kΩ VCO PLL Noise det. 0.047 µF 18 PNL 0.1 µF 21 680 pF 23 100 kΩ 24 5 Multipath det. VREF GND 29 L-Out 0.022 µF 0.022 µF R-Out Sep. Adj. 0.1µF 50 kΩ ATC Adj. 50 kΩ ASC Adj. Forced Mono 4 0.1µF 3 1000 pF 32 M53 Level det. 0.022 µF IF limiter 31 IF In 9 6 IF det. 27 30 AFC 0.1 µF 10 kΩ 0.1 µF VREF 0.1 µF 7 28 100 kΩ 12 0.01 µF 26 2.2 kΩ 0.1 µF 8 Mute 25 180 pF(pH) 0.1 µF 10 Demod. SD, IF counter Band Mute 0.01 µF 1µF 14 11 22 5.6 kΩ CERALOCK (912 k) 15 13 10 kΩ 20 Pilot det. 51 kΩ 0.01 µF 1µF 16 17 0.1 µF 330 kΩ 2 100 kΩ 100 pF 1 50kΩ S-Meter S-Meter Adj. M53 5