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| 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 Applied voltage Power dissipation Operating temperature Storage temperature *Reduced by 4.5mW for each increase in Ta of 1 ) SYMBOL Vmax PD Topr Tstg over 25 ) RATINGS 7.0 450 * -25 +75 -55 +125 UNIT V mW 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 47 F 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 ,Vcc=5.0V,RL=32 VIN=0Vrms ,VIN= -6dBV, f=1kHz) ELECTRICAL CHARACTERISTICS (Ta=25 SYMBOL IQ VTM Gvc Gvc THD Po1 Po2 VNO CS ATT RR 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 CONDITIONS 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 BW=20 20kHz RL=32 ,THD<0.1% RL=16 ,THD<0.1% BW=20 20kHz,Rg=0 Rg=0 Rg=0 fRR=100Hz,VRR= -20dBV -85 MEASUREMENT CIRCUIT 32 SW7 1 16 2 330 + SW5 1 1 2 V V7AC VIN2 + 47 IN2 SW8B A IQ + CVcc 10 Vcc 8 OUT2 7 BIAS 6 5 BIAS 1 2 SW8A TSD + 6dB Vcc MUTE 32 SW1 1 + 6dB + 90K 90K VRR 1 OUT1 2 MUTE 3 IN1 4 GND 1 SW3 1 2 16 2 V1AC V 330 VTM VIN1 UTC UNISONIC TECHNOLOGIES CO. LTD 4 QW-R107-040,A UTC 3544 SIGNAL IQ VTM GVC Gvc THD Po1 Po2 VNO CS 1 1 2 1 1 1 1 1 2 2 2 1 1 2 2 1 LINEAR INTEGRATED CIRCUIT SW3 1 MEASUREMENT CONDITIONS SW1 1 SW TABLE SW5 SW7 1 1 SW8A 2 SW8B OFF MONITOR IQ V1AC,V2AC CONDITIONS 1 2 2 1 2 ON 2 2 2 1 2 1 2 1 1 1 2 1 1 1 1 1 2 2 2 2 2 2 2 1 ON ON ON ON ON ON ON ON V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC V1AC,V2AC f=1kHz,VIN1/2=-6dBV, VTM=1.6V GVC1 - GVC2 fin=1kHz,VIN1/2= -6dBV, VTM=1.6V fin=1kHz,VIN1/2= -6dBV, VTM=1.6V fin=1kHz,VIN1/2= -6dBV, VTM=1.6V fin=1kHz,VIN2= -6dBV, VTM=1.6V fin=1kHz,VIN1= -6dBV, VTM=1.6V fin=1kHz,VIN1/2= -6dBV, VTM=0.3VB VRR= -20dBV, fRR=100Hz ATT RR CIRCUIT OPERATION Rising edge timing Rise period A Play period A Rise period B Vcc C OUT VMUTE A: MUTE period(use with MUTE=Low to prevent the popping noise when the power is turned on and off). B: MUTE release time(used to prevent the popping noise at the release of MUTE with the external C2 and R2 and therefore possesses a time constant,so be careful of the timing). C: MUTE start time(also possesses a time constant like the MUTE release time). UTC UNISONIC TECHNOLOGIES CO. LTD 5 QW-R107-040,A UTC 3544 APPLICATION EXAMPLE 330 + LINEAR INTEGRATED CIRCUIT + V + Vcc 8 OUT2 7 BIA S 6 47 IN2 5 1 VIN2 BIAS 6dB TSD + 6dB 90K + 90K MUTE 1 OUT1 + VMUTE 100k H:Active L:Mute 1 2 MUTE 3 IN1 4 GND 1 VIN1 EXPLANATION OF EXTERNAL XOMPONENTS (1)Input coupling capacitor(C3 and C5) Determined by the low-band cut-off frequency.Since the input impedance for this IC is 180k ,it can be determined by the formula below,but take into consideration the fluctuations,ambent temperature,etc.(a multi-layered ceramic capacitor is recommended). C3(C5)=1/(2 180k f) (2)BIAS capacitor(C6) 47 F when Vcc=5V,and 33 F when Vcc=3V.If the capacitance is lowered too much,the electrical characteristics will be adversely affected and popping noise may occur.Therefore,take th sufficient considerations before changing these values. (3)MUTE pin for anti-pop measures(R2 and C2) Possesses an impedance of 190k with respect to GND,so if R2 is increased too much,the MUTE mode may become unable to be released. (4)Output coupling capacitor(C1 and C7) Determined by the low-band cutoff frequency.As the output load resistance value RL(assuming that for output protection or current limiting,a resistor Rx will be inserted),it can be determined by the formula below. C1(C7)=1/(2 (RL+Rx) f) (5)Input gain adjustment resistor(R3 and R4) Input gain adjustment can by performed by extemal resistors R3 and R4,The desired gain can be set by the formula givev below. Gvc=6+20log(90k /(90k +R3)) dB UTC UNISONIC TECHNOLOGIES CO. LTD 6 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT Fig.2 Pin DC current vs. power supply voltage 5 Ta=25 RL=32 5 ELECTRICAL CHARACTERISTIC CURVES Fig.1 Quiescent current vs. power supply voltage 10 QUIESCENT CURRENT: IQ (mA) Ta=25 9 RL=32 8 7 6 5 4 3 2 1 0 0 2 4 6 8 10 SUPPLY VOLTAGE: Vcc (V) BIAS DC VOLTAGE: VBIAS (V) MUTE: OFF 3 3 2 2 MUTE: ON 1 1 0 0 2 4 6 8 10 SUPPLY VOLTAGE:Vcc(V) 0 Fig.3 Output voltage vs. MUTE control voltage Ta=25 RL=32 Vcc=5V -10 VIN=0dBV -20 f=1kHz 0 -30 -40 -50 -60 -70 -80 -90 0 0.4 0.8 1.2 1.6 2 MUTE CONTROL VOLTAGE VTM Fig.4 Voltage gain vs.frequency 8 6 4 VOLTAGE GAIN:Gvc(dB) 2 0 -2 -4 -6 -8 -10 -12 10 100 1k Ta=25 RL=32 Vcc=5V 10k 100k 10 UTC OUTPUT VOLTAGE: VOUT (dBV) UNISONIC TECHNOLOGIES CO. LTD 7 QW-R107-040,A OUTPUT DC VOLTAGE: Vo (V) 4 4 UTC 3544 10 TOTAL HARMONIC DISTORTION:THD(%) LINEAR INTEGRATED CIRCUIT Fig.6 Total harmonic distortion vs. output voltage ( II ) 10 TOTAL HARMONIC DISTORTION:THD(%) Ta=25 RL=32 Vcc=3V 1 f=10kHz 0.1 f=1kHz Fig.5 Total harmonic distortion vs. output voltage ( I ) Ta=25 RL=32 Vcc=5V 1 f=10kHz 0.1 f=1kHz 0.01 f=100Hz 0.001 -40 -30 -20 -10 0 10 0.01 f=100Hz 0.001 -40 -30 -20 -10 0 10 OUTPUT VOLTAGE: Vo (dBV) OUTPUT VOLTAGE: Vo (dBV) Fig.7 Total harmonic distortion vs. output voltage (III) 10 TOTAL HARMONIC DISTORTION:THD (%) Fig.8 Total harmonic distortion vs. output voltage( IV ) 10 TOTAL HARMONIC DISTORTION:THD (%) Ta=25 RL=16 Vcc=5V 1 f=10kHz f=1kHz Ta=25 RL=16 Vcc=3V 1 f=10kHz 0.1 f=1kHz 0.1 f=100Hz 0.01 0.01 f=100Hz 0.001 -40 -30 -20 -10 0 10 0.001 -40 -30 -20 -10 0 10 OUTPUT VOLTAGE: Vo (dBV) OUTPUT VOLTAGE: Vo (dBV) Fig.9 Channel separation vs.frequency 120 100 80 60 Ta=25 RL=32 Rg=0 Vcc=5V 100 90 MUTE ATTENUTION: ATT (dB) 80 70 60 50 40 30 20 10 100 1k FREQUENCY: f (Hz) Fig.10 MUTE attenuation vs.frequency CHANNEL SEPARATION: CS (dB) 40 20 0 10 10k 100k 0 10 C-BIAS: 100 F C-BIAS: 47 F C-BIAS: 33 F VTM=OPEN RL=32 VIN=0dBV Vcc=5V 1k 10k 100k 100 FREQUENCY: f (Hz) UTC UNISONIC TECHNOLOGIES CO. LTD 8 QW-R107-040,A UTC 3544 80 70 RIPPLE REJECTION: RR (dB) 60 50 40 30 20 10 0 10 LINEAR INTEGRATED CIRCUIT Fig.12 Ripple rejection vs.power supply voltage 100 90 RIPPLE REJECTION:RR (dB) Fig.11 Ripple rejection vs.frequency Ta=25 VRR= -20dBV Rg=0 Vcc=5V 80 70 6 0 50 40 30 20 10 0 Ta=25 VRR= -20dBV RL=32 Rg=0 fRR=100Hz 100 1k FREQUENCY: f (Hz) 10k 100k 0 2 4 6 8 10 SUPPLY VOLTAGE: Vcc (V) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UTC UNISONIC TECHNOLOGIES CO. LTD 9 QW-R107-040,A |
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