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 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℃ RATINGS UNIT 7.0 450 * -25～+75 -55～+125 V mW ℃ ℃ RECOMMENDED OPERATING CONDITIONS (Ta=25℃) PARAMETER Power supply voltage UTC SYMBOL MIN. Vcc 2.8 UNISONIC TECHNOLOGIES TYP. MAX. UNIT 6.5 V CO. LTD 1 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM Vcc OUT2 BIAS IN2 8 7 6 5 BIAS 90K 6dB + TSD 90K + 6dB MUTE UTC 1 2 3 4 OUT1 MUTE IN1 GND UNISONIC TECHNOLOGIES CO. LTD 2 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT PIN DESCRIPTIONS PIN NO. PIN NAME I/O PIN VOLTAGE INTERNAL EQUIVALENT CIRCUIT 1 OUT1 O FUNCTION Output pin Vcc 2.1V 1 7 7 OUT2 O 10k 2.1V (Vcc=5V) Mute control pin (set to low for prevention of popping noise when power is turned on and off). Vcc 2 MUTE I 0.1V (When open) 2 Operating: High Muting: Low(open) 190k Input pin Vcc 3 IN1 I 2.1V 3 5 IN2 I 2.1V (Vcc=5V) 5 180k BIAS Vcc 6 BIAS I/O 2.1V (Vcc=5V) 60k 6 BIAS 60k 4 5 GND Vcc UTC I I Bias pin(the external 47μF capacitor also serves as the anti-pop time constant, therefore make the proper considerations be changing it). - UNISONIC TECHNOLOGIES CO. LTD 3 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (Ta=25℃,Vcc=5.0V,RL=32Ω,VIN= -6dBV, f=1kHz) PARAMETER SYMBOL 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 IQ VTM Gvc △Gvc CONDITIONS MIN. TYP. MAX. UNIT VIN=0Vrms 4 0.3 4 -0.5 BW=20～20kHz RL=32Ω,THD<0.1% RL=16Ω,THD<0.1% BW=20～20kHz,Rg=0Ω Rg=0Ω Rg=0Ω THD Po1 Po2 VNO CS ATT RR 82 70 50 7 0.7 6 0 0.02 31 62 -93 90 80 57 1μ 1 25 50 fRR=100Hz,VRR= -20dBV 10 1.6 8 0.5 0.1 -85 mA V dB dB % mW mW dBV dB dB dB MEASUREMENT CIRCUIT 32 SW5 SW7 1 16 330μ + 2 2 V V7AC VIN2 + SW8B + A IQ CVcc 10μ Vcc IN2 BIAS OUT2 7 8 47μ 6 5 BIAS 1 2 SW8A 90K 6dB + 90K TSD VRR + 6dB Vcc MUTE 32 SW1 1 1 + 16 2 2 3 MUTE OUT1 4 IN1 GND 1μ 330μ V1AC V SW3 1 2 VTM VIN1 UTC UNISONIC TECHNOLOGIES CO. LTD 4 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT MEASUREMENT CONDITIONS SIGNAL SW TABLE SW5 SW7 SW1 SW3 IQ VTM 1 1 1 GVC 1 2 THD 1 Po1 MONITOR SW8A SW8B 1 2 OFF IQ 2 1 2 ON V1AC,V2AC 2 2 1 2 ON V1AC,V2AC 1 2 2 1 2 ON V1AC,V2AC Po2 2 2 2 2 2 ON V1AC,V2AC VNO 1 1 1 1 2 ON V1AC,V2AC CS 1 1 1 2 2 1 1 1 2 2 ON ON V1AC,V2AC V1AC,V2AC ATT 1 2 2 1 2 ON V1AC,V2AC RR 1 1 1 1 1 ON V1AC,V2AC △Gvc CONDITIONS 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 CIRCUIT OPERATION Rising edge timing Rise period Play period A B A Rise period C Vcc 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 LINEAR INTEGRATED CIRCUIT APPLICATION EXAMPLE 330μ + Vcc + BIA S OUT2 Vcc 7 8 1μ 47μ + VIN2 IN2 6 5 BIAS 90K 6dB + TSD 90K + 6dB MUTE 1 2 OUT1 3 MUTE 4 IN1 GND + 1μ VMUTE VIN1 100k 1μ H:Active L:Mute 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 180kΩ,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/(2π×180kΩ×f) (2)BIAS capacitor(C6) 47μF when Vcc=5V,and 33μF 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 190kΩ 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/(2π×(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(90kΩ/(90kΩ+R3))［ dB ］ UTC UNISONIC TECHNOLOGIES CO. LTD 6 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTIC CURVES Fig.1 Quiescent current vs. power supply voltage Fig.2 Pin DC current vs. power supply voltage Ta=25℃ 9 RL=32Ω 8 MUTE: OFF 7 6 5 4 3 MUTE: ON 2 1 0 2 0 4 6 8 4 4 3 3 2 2 1 1 0 10 0 SUPPLY VOLTAGE: Vcc (V) 0 2 4 6 8 0 6 Ta=25℃ RL=32Ω Vcc=5V -10 VIN=0dBV -20 f=1kHz VOLTAGE GAIN:Gvc(dB) 4 -30 -40 -50 -60 -70 2 0 -2 -4 -6 -8 Ta=25℃ RL=32Ω Vcc=5V -10 -80 -90 0.4 10 Fig.4 Voltage gain vs.frequency 10 0 8 SUPPLY VOLTAGE:Vcc(V) Fig.3 Output voltage vs. MUTE control voltage OUTPUT VOLTAGE: VOUT (dBV) 5 Ta=25℃ RL=32Ω OUTPUT DC VOLTAGE: Vo (V) 5 BIAS DC VOLTAGE: VBIAS (V) QUIESCENT CURRENT: IQ (mA) 10 0.8 1.2 1.6 2 -12 10 100 1k 10k 100k MUTE CONTROL VOLTAGE VTM UTC UNISONIC TECHNOLOGIES CO. LTD 7 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT Fig.5 Total harmonic distortion vs. output voltage ( I ) Fig.6 Total harmonic distortion vs. output voltage ( II ) 10 Ta=25℃ RL=32Ω Vcc=5V TOTAL HARMONIC DISTORTION:THD(%) TOTAL HARMONIC DISTORTION:THD(%) 10 1 f=10kHz 0.1 f=1kHz 0.01 f=100Hz 0.001 -40 -30 -10 -20 0 10 Ta=25℃ RL=32Ω Vcc=3V 1 f=10kHz 0.1 f=1kHz 0.01 f=100Hz 0.001 -40 -30 OUTPUT VOLTAGE: Vo (dBV) Fig.7 Total harmonic distortion vs. output voltage (III) 10 10 Ta=25℃ R L=16Ω Vcc=5V TOTAL HARMONIC DISTORTION:THD (%) TOTAL HARMONIC DISTORTION:THD (%) 0 Fig.8 Total harmonic distortion vs. output voltage( IV ) 10 1 f=10kHz f=1kHz 0.1 0.01 f=100Hz 0.001 -40 -30 -10 -20 0 10 Ta=25℃ R L =16Ω Vcc=3V 1 f=1kHz f=100Hz 0.01 0.001 -40 60 40 20 1k 10k 90 70 60 50 40 30 20 100k 0 10 V TM =OPEN R L =32Ω V IN =0dBV Vcc=5V C-BIAS: 100μ F C-BIAS: 47μF C-BIAS: 33μ F 100 FREQUENCY: f (Hz) UTC 10 80 10 100 0 100 MUTE ATTENUTION: ATT (dB) 80 0 10 -10 -20 Fig.10 MUTE attenuation vs.frequency Ta=25℃ R L =32Ω Rg=0Ω Vcc=5V 100 -30 OUTPUT VOLTAGE: Vo (dBV) Fig.9 Channel separation vs.frequency 120 f=10kHz 0.1 OUTPUT VOLTAGE: Vo (dBV) CHANNEL SEPARATION: CS (dB) -10 -20 OUTPUT VOLTAGE: Vo (dBV) UNISONIC TECHNOLOGIES 1k 10k 100k FREQUENCY: f (Hz) CO. LTD 8 QW-R107-040,A UTC 3544 LINEAR INTEGRATED CIRCUIT Fig.11 Ripple rejection vs.frequency Ta=25℃ VRR= -20dBV Rg=0Ω Vcc=5V 70 RIPPLE REJECTION: RR (dB) Fig.12 Ripple rejection vs.power supply voltage 60 50 40 30 20 10 0 10 100 Ta=25℃ VRR= -20dBV RL=32Ω Rg=0Ω fRR=100Hz 90 RIPPLE REJECTION:RR (dB) 80 80 70 6 0 50 40 30 20 10 0 100 1k 10k 100k 0 2 FREQUENCY: f (Hz) 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