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| BA3571F Audio ICs Headphone driver for portable CD players BA3571F The BA3571F is headphone drivers designed for portable CD players. An oscillation damper is not needed at the headphone output, minimizing external components. Includes a bass boost circuit which enables setting of the bass boost with external components. !Applications Portable CD players !Features 1) An external oscillation damper is not needed. 2) Includes a bass boost circuit making it possible to set the bass boost with attached components. !Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 5.5 550 *1 -25~+75 -55~+125 Unit V mW C C *1 Reduced by 5.5mW for each increase in Ta of 1C over 25C. !Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Min. 2.0 Typ. Max. 5.5 Unit V BA3571F Audio ICs !Block diagram 11 VCC GND Vcc 1 10 9 8 BB SW 6 7 5 4 2 3 1 Power GND Out 1 12 Out 2 Vcc 2 13 14 NC BB SW NC 15 BB SW Ripple Filter RF1 16 17 50k LP Out NC 39k LP NF IN 1 18 IN 2 Bias in 19 VCC LP IN Bias out Pre GND 20 Pre GND BA3571F Audio ICs !Electrical characteristics _ (unless otherwise noted, Ta = 25C, VCC = 3V, RL = 16, and f = 1kHz; measurement circuit shown in Fig.1) Parameter Quiescent current Voltage gain 1 Voltage gain 2 Rated output power Total harmonic distortion Channel balance Output noise voltage 1 Output noise voltage 2 Input resistance Ripple rejection Boost Channel separation * Not designed for radiation resistance. Symbol IQ GV1 GV2 POUT THD CB VNO1 VNO2 RIN RR BB CS Min. 13.5 11.5 20 -1.5 10.8 23 4 52 Typ. 9 15 13 30 0.15 0 -92 -88 13.5 36 6 62 Max. 18 16.5 14.5 1.0 1.5 -88 -84 16.2 8 - Unit mA dB dB mW % dB dBm dBm k dB dB dB VIN = 0Vrms BB = OFF BB = ON THD = 10% Conditions VO = -16dBm VO = -16dBm BB = OFF, IHF - A BB = ON, IHF - A fRR = 100Hz, VRR = -30dBm, BB = OFF f = 100Hz, VIN = -36dBm f = 1kHz, BB = OFF !Measurement circuit 10k 1 ~ + 1 2 SW5 A 47 13k 33 20 VCC 1 2 SW1 1 2 SW3 12 18 17 220 + 16 RF1 + 19 33 15 14 13 12 16 11 SW2 + V ~ THD VCC VCC + 220 50k Pre GND 39k GND BB SW THD 8 9 10 1 2 3 4 12 100k 13k 100k 0.1 ~ + 1 1 10k 2 SW6 SW3 5 6 + SW4 2.2 5.1k 0.1 12 7 + 0.22 + 220 V ~ 16 1 2 ~ GND Units Resistors : (1%) Capacitors : F (1%) Capacitors (electrolytic) : F (5%) Fig. 1 BA3571F Audio ICs !Application example + LINE OUT 1 4.7k 10k VCC + 33 + 33 220 + 20 19 18 17 16 15 14 13 12 11 RF1 VCC VCC 50k GND BB SW 1 2 3 4 + 2.2 Pre 39k GND 5 0.1 6 + 7 0.22 8 9 + 220 10 100k 0.1 1 4.7k + 100k 5.1k GND LINE OUT 10k Units Resistors : (5%) Capacitors : F (10%) Capacitors (electrolytic) : F (20%) Fig. 2 !Electrical characteristic curve !External dimensions (Units: mm) BA3571F (dB) VOLTAGE GAIN : GV 30 20 BB OFF BB ON 10 7.80.3 20 12.50.2 11 0 5.40.2 100 1k 10k FREQUENCY : f (Hz) 1.80.1 -10 1 10 0.11 1.27 0.40.1 0.3Min. 0.15 Fig. 3 Voltage gain vs. frequency SOP20 0.150.1 |
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