3544

UTC 3544 LINEAR INTEGRATED CIRCUIT HEADPHONE AMPLIFIER FOR CD-ROMS DESCRIPTION The UTC 3544 is digital-source dual headphone amplifier. The UTC 3544 has a fixed gain of 6dB so that external gain setting is unnecessary. The UTC 3544 has internal mute function so that prevention of the popping sound when power is turned on and off is greatly simplified. Also, The UTC 3544 is equipped with thermal shutdown circuits to prevent damage from short circuits. SOP-8 FEATURES *Internal mute function to prevent popping sounds when *the power is turned on and off. *Built-in thermal shutdown circuit (150℃) to prevent *damage to the IC if a short circuit occurs. *Pb-free plating product number: 3544L APPLICATIONS Devices that use the headphone output from CD-ROMs, CDs, MDs, personal computers, notebook computers, camcorders, etc. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) PARAMETER SYMBOL RATINGS 7.0 450 * -25～+75 -55～+125 UNIT V mW ℃ ℃ Applied voltage Vmax Power dissipation PD Operating temperature Topr Storage temperature Tstg *Reduced by 4.5mW for each increase in Ta of 1℃ over 25℃ RECOMMENDED OPERATING CONDITIONS (Ta=25℃) PARAMETER Power supply voltage SYMBOL Vcc MIN. 2.8 TYP. MAX. 6.5 UNIT V UTC UNISONIC TECHNOLOGIES CO. LTD 1 QW-R107-040,A UTC 3544 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT Vcc 8 OUT2 7 BIAS 6 IN2 5 BIAS 6dB TSD + 6dB 90K + 90K MUTE 1 OUT1 2 MUTE 3 IN1 4 GND UTC UNISONIC TECHNOLOGIES CO. LTD 2 QW-R107-040,A UTC 3544 PIN DESCRIPTIONS PIN NO. PIN NAME I/O LINEAR INTEGRATED CIRCUIT PIN VOLTAGE INTERNAL EQUIVALENT CIRCUIT Vcc FUNCTION Output pin 1 OUT1 O 2.1V 1 7 7 OUT2 O 2.1V (Vcc=5V) 10k Vcc 2 MUTE I 0.1V (When open) 2 Mute control pin (set to low for prevention of popping noise when power is turned on and off). Operating: High Muting: Low(open) 190k Vcc Input pin 3 IN1 I 2.1V 3 180k BIAS 5 IN2 I 2.1V (Vcc=5V) 5 Vcc 6 BIAS I/O 2.1V (Vcc=5V) 60k 6 BIAS 60k Bias pin(the external 47μF capacitor also serves as the anti-pop time constant, therefore make the proper considerations be changing it). 4 5 GND Vcc I I - UTC UNISONIC TECHNOLOGIES CO. LTD 3 QW-R107-040,A UTC 3544 PARAMETER LINEAR INTEGRATED CIRCUIT SYMBOL IQ VTM Gvc △Gvc THD Po1 Po2 VNO CS ATT RR ELECTRICAL CHARACTERISTICS (Ta=25℃,Vcc=5.0V,RL=32Ω,VIN= -6dBV, f=1kHz) CONDITIONS VIN=0Vrms MIN. TYP. MAX. UNIT 4 0.3 4 -0.5 25 50 82 70 50 7 0.7 6 0 0.02 31 62 -93 90 80 57 10 1.6 8 0.5 0.1 mA V dB dB % mW mW dBV dB dB dB Quiescent current Mute pin control voltage Voltage gain Voltage gain difference between channels Total harmonic distortion Rated output 1 Rated output 2 Output noise voltage Channel separation Mute attenuation Ripple rejection BW=20～20kHz RL=32Ω,THD