PDF BA1451F Data sheet ( Hoja de datos )

Número de pieza	BA1451F
Descripción	AM radio / FM IF stereo system IC
Fabricantes	ROHM Semiconductor
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No Preview Available ! Audio ICs AM radio / FM IF stereo system IC BA1451F BA1451F The BA1451F is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX. It has been developed for HiFi component applications. The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes. In particular, the laser lock technique used in the VCO means that no external adjustment is required. !Applications Synthesized tuner for HiFi components. !Features 1) Built-in AM monaural radio, FM IF amplifier/detector, and FM stereo demodulator. 2) DTS (both SD and IF count) compatible. 3) Built-in reference voltage power supply provides good shortwave band frequency stability. 4) Good FM stability. 5) The FM MPX VCO uses laser locking making adjustment and external components unnecessary. 6) Built-in forced monaural operation function for MPX (VCO stops, and LED goes off). 7) Low cutoff of audio is possible to improve AM fidelity. 8) MPX VCO stops in AM mode. 9) Audio muting is possible when an IF request is made. !Block diagram 24 23 22 21 20 19 18 17 16 Vreg AM OSC AM AM IF MIX AM DET AGC FM IF Vcc 12 SD DET 3 GND 4 FM DET 5 LED DRIVER COMP 6789 15 14 13 SD 1/2 SW 1/2 PD DECODER VCO 10 11 12 1 page Audio ICs Pin No. Function FM detector bandwidth adjustment 21 Connect a resistor from this pin to the reference voltage supply to set the required detector bandwidth. Reference voltage supply 23 Connected to a capacitor. AM local oscillator 22 Connect to the AM OSC circuit. AM local oscillator output 24 AM OSC output. BA1451F Internal circuit VCC 2 21 GND 4 4.3kΩ Quiescent pin voltage (V) FM AM 2.1 2.1 2.1 2.1 Vreg 23 GND 4 22 2.1 2.1 24 1.7 1.4 !Electrical characteristics (Unless otherwise specified, Ta=25°C and VCC=5V) FM IF MPX signal source : fiN=10.7MHz, modulation 1kHz, 75kHzdev (100%) 19kHz 7.5kHzdev (10%) AM : fiN=1000kHz, modulation 1kHz 30% Parameter Quiescent current FM Quiescent current AM <FM IF MPX> Detector output voltage −3dB limiting sensitivity Signal-to-noise ratio Channel balance AM suppression ratio Channel separation Total harmonic distortion Station detector sensitivity Station detector bandwidth IF OUT output voltage <AM> Detector output voltage Usable sensitivity Signal-to-noise ratio Total harmonic distortion Station detector sensitivity IF OUT output voltage Local buffer output voltage Symbol IQ (FM) IQ (AM) Min. 13 11 VO L.S S/N C.B AMR SEP THD SDS SDSW VIF 340 34 72 −2 45 35 − 34 70 300 VO Q.S S/N THD SDS VIF VOBuff 70 22 42 − 21 300 140 Typ. 21 19 480 37 80 0 55 45 0.5 39 100 400 90 25 52 0.6 26 400 200 Max. 29 27 Unit mA No input mA No input Conditions 670 mVrms VIN=100dBµV,mono 40 dBµV mono − dB VIN=100dBµV, mono +2 dB VIN=100dBµV, mono − dB AM : V IN=60dBµV, mod=30% , 400Hz − dB VIN=100dBµV, main 1.6 % VIN=100dBµV, main 44 dBµV Input for pin 6 current ≥ 1mA 150 kHz VIN=100dBµV, mono 530 mVP-P IF request ON 120 mVrms VIN=68dBµV 28 dBµV Input for S / N = 20dB − dB VIN=68dBµV 1.8 % VIN=68dBµV 31 dBµV Input for pin 6 current ≥ 1mA 530 mVP-P IF request ON 280 mVrms 5 Page

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