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 = 25°C) Parameter Symbol Limits Power supply voltage VCC 5.5 Power dissipation Pd 550 *1 Unit V mW Operating temperature Topr -25~+75 ˚C Storage temperature Tstg -55~+125 ˚C *1 Reduced by 5.5mW for each increase in Ta of 1˚C over 25˚C. !Recommended operating conditions (Ta = 25°C) Parameter Symbol Min. Typ. Max. Unit Power supply voltage VCC 2.0 - 5.5 V BA3571F Audio ICs 10 9 8 7 19 Bias out 6 18 Bias in 5 17 IN 1 BB SW LP Out 4 16 NC BB SW τ LP NF 3 15 Ripple Filter τ IN 2 2 14 NC Out 2 LP IN 1 13 NC Power GND Pre GND Pre GND VCC 39k 50k RF1 BB SW 12 Vcc 2 GND 11 Out 1 VCC Vcc 1 20 !Block diagram BA3571F Audio ICs !Electrical characteristics _ (unless otherwise noted, Ta = 25°C, VCC = 3V, RL = 16Ω, and f = 1kHz; measurement circuit shown in Fig.1) Parameter Symbol Min. Typ. Max. Unit IQ - 9 18 mA VIN = 0Vrms Voltage gain 1 GV1 13.5 15 16.5 dB BB = OFF Voltage gain 2 GV2 11.5 13 14.5 dB BB = ON Rated output power POUT 20 30 - mW THD = 10% Total harmonic distortion THD - 0.15 1.0 % VO = -16dBm CB -1.5 0 1.5 dB VO = -16dBm Output noise voltage 1 VNO1 - -92 -88 dBm BB = OFF, IHF - A Output noise voltage 2 VNO2 - -88 -84 dBm BB = ON, IHF - A Input resistance RIN 10.8 13.5 16.2 kΩ Ripple rejection RR 23 36 - dB f RR = 100Hz, VRR = -30dBm, BB = OFF Quiescent current Channel balance Conditions Boost BB 4 6 8 dB f = 100Hz, VIN = -36dBm Channel separation CS 52 62 - dB f = 1kHz, BB = OFF * Not designed for radiation resistance. !Measurement circuit 10k 1µ + ~ VCC 1 1 A SW5 2 1 47 SW3 13k 33µ 20 19 220µ + 1 2 + 17 18 33µ 16 16 2 SW1 SW2 2 + 15 14 13 12 11 RF1 V ~ THD VCC VCC + 220µ 50k 39k Pre GND GND BB SW 3 2 1 4 1 2 100k 13k 100k SW3 5 6 + SW4 2.2µ 5.1k 0.1µ 1 2 THD 8 7 10 9 + 0.22µ + 220µ V ~ 16 1 2 ~ GND 0.1µ ~ Units Resistors : Ω (±1%) Capacitors : F (±1%) Capacitors (electrolytic) : F (±5%) + 1 1µ 10k 2 SW6 Fig. 1 BA3571F Audio ICs !Application example + LINE OUT 1µ 10k 4.7k VCC + 33µ 220µ 33µ + 20 19 16 17 18 + 15 12 13 14 11 RF1 VCC VCC 50k 39k Pre GND GND BB SW 3 2 1 1µ 4.7k + 5 + 2.2µ 5.1k 0.1µ LINE OUT 4 100k 100k + 10 9 8 7 6 0.1µ 0.22µ + 220µ GND Units Resistors : Ω (±5%) Capacitors : F (±10%) Capacitors (electrolytic) : F (±20%) 10k Fig. 2 !Electrical characteristic curve !External dimensions (Units: mm) 20 BB OFF BB ON 12.5±0.2 100 1k 10k FREQUENCY : f (Hz) 11 1 10 1.27 0.4±0.1 Fig. 3 Voltage gain vs. frequency 0.15±0.1 -10 20 5.4±0.2 0 1.8±0.1 7.8±0.3 10 0.11 VOLTAGE GAIN : GV (dB) BA3571F 30 0.3Min. 0.15 SOP20