UNISONIC TECHNOLOGIES CO., LTD 3544 LINEAR INTEGRATED CIRCUIT HEADPHONE AMPLIFIER FOR CD-ROMS DESCRIPTION As a dual headphone amplifier the UTC 3544 is digital-source. The UTC 3544 has a steady gain of 6dB and so it is unnecessary for external gain setting. The UTC 3544 has internal mute function so that it is greatly simplified for prevention of the popping sound when power is turned on and off. To prevent damage from short circuits the UTC 3544 is equipped with thermal shutdown circuit. FEATURES * Internal mute function to prevent popping sounds when *the power is turned on and off. * Built-in thermal shutdown circuit (150°C) to prevent *damage to the IC if a short circuit occurs. ORDERING INFORMATION Ordering Number Lead Free Halogen Free 3544L-D08-T 3544G-D08-T 3544L-S08-R 3544G-S08-R www.unisonic.com.tw Copyright © 2009 Unisonic Technologies Co., Ltd Package Packing DIP-8 SOP-8 Tube Tape Reel 1 of 9 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT PIN DESCRIPTIONS PIN NO. PIN NAME I/O PIN VOLTAGE INTERNAL EQUIVALENT CIRCUIT FUNCTION Vcc 1 OUT1 O 2.1V Output pin 1 7 2 OUT2 MUTE O I 2.1V (VCC=5V) 7 10k Mute control pin (set to low for prevention of popping noise when power is turned on and off). 0.1V (When open) Operating: High Muting: Low(open) Vcc 3 IN1 I 2.1V 3 5 IN2 I 6 BIAS I/O 4 8 GND VCC I I 2.1V (VCC=5V) 2.1V (VCC=5V) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 Input pin 180k BIAS Bias pin (the external 47μF capacitor also serves as the anti-pop time constant, therefore make the proper considerations be changing it). 2 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL VMAX Applied Voltage Power Dissipation Derate above 25°C RATINGS 7.0 450 PD UNIT V mW 4.5 mW/°C Operating Temperature TOPR -25 ~ +75 °C Storage Temperature TSTG -55 ~ +125 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. RECOMMENDED OPERATING CONDITIONS (Ta=25°C) PARAMETER Power Supply Voltage SYMBOL MIN VCC 2.8 TYP MAX UNIT 6.5 V ELECTRICAL CHARACTERISTICS (Ta=25°C, VCC=5.0V, RL=32Ω, VIN= -6dBV, f=1kHz) PARAMETER Mute Pin Control Voltage Quiescent Current 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 SYMBOL VTM IQ Gv △Gv(DIFF) THD Po1 Po2 eN CS ATT RR UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw CONDITIONS VIN=0Vrms BW=20~20kHz RL=32Ω,THD<0.1% RL=16Ω,THD<0.1% BW=20~20kHz,Rg=0Ω Rg=0Ω Rg=0Ω fRR=100Hz, VRR= -20dBV MIN 0.3 4 4 -0.5 25 50 82 70 50 TYP 0.7 7 6 0 0.02 31 62 -93 90 80 57 MAX 1.6 10 8 0.5 0.1 -85 UNIT V mA dB dB % mW mW dBV dB dB dB 4 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT MEASUREMENT CIRCUIT 32 1 16 SW5 1 330μ SW7 + 2 2 V V2AC VIN2 1μ 47μ + A IQ 10μ Vcc 7 6 1 90K 6dB 2 VRR 6dB 5 BIAS TSD SW8A IN2 BIAS OUT2 8 SW8B + + 90K + MUTE Vcc 32 1 SW1 16 1 330μ 3 4 GND IN1 MUTE OUT1 + 2 2 VTM 1 1μ V1AC V 2 SW3 VIN1 MEASUREMENT CONDITIONS SIGNAL SW TABLE SW5 SW7 1 1 SW1 1 SW3 1 1 2 2 THD 1 2 Po1 1 Po2 MONITOR SW8A 2 SW8B OFF 1 2 ON V1AC,V2AC 2 1 2 ON V1AC,V2AC 2 2 1 2 ON V1AC,V2AC 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 IQ VTM GVC IQ △Gvc UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 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 5 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT CIRCUIT OPERATION Rising edge timing Rising period A B Vcc A Play period Descending period 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 C 2 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 ). UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT APPLICATION EXAMPLE C6 Vcc + 330μ + C1 VIN2 BIAS OUT2 7 Vcc 8 1μ 47μ + IN2 6 C3 5 BIAS TSD 90K 6dB + + 6dB 90K MUTE C7 + 330μ VMUTE 1 2 OUT1 3 MUTE 4 IN1 1μ R2 100k GND VIN1 C2 1μ C5 H:Active L:Mute EXPLANATION OF EXTERNAL COMPONENTS (1)Input coupling capacitor (C3 and C5) First determined by the low-band cut-off frequency. Because the input impedance is 180kΩ for this IC, it can be determined by this formula C3(C5)=1/(2π×180kΩ×f) But make sure taking the fluctuations, ambient temperature, etc into consideration. A multi-layered ceramic capacitor is recommended. (2)BIAS capacitor(C6) 47μF when Vcc=5V, and 33μF when Vcc=3V. Before changing these values take the sufficient considerations.It is because the electrical characteristics will be adversely affected and popping noise may occur if the capacitance is lowered too much. (3)MUTE pin for anti-pop measures (R2 and C2) An impedance of 190kΩ must be possessed with respect to GND, so the MUTE mode may become unable to be released if R2 is increased too much. (4)Output coupling capacitor(C1 and C7) Also determined by the low-band cutoff frequency. Like the output load resistance value RL (a resistor Rx will be inserted ,assuming that for output protection or current limiting), it can be calculated by this formula C1(C7)=1/(2π×(RL+Rx) ×f) (5)Input gain adjustment resistor(R3 and R4) External resistors R3 and R4 can perform input gain adjustment .The desired gain can be calculated by this formula Gv=6+20log(90kΩ/(90kΩ+R3))[dB] UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Quiescent Current vs. Power Supply Voltage 10 Ta=25℃ RL=32Ω 9 8 7 Bias DC Voltage, VBIAS (V) Quiescent Current, IQ (mA) Pin DC Current vs. Power Supply Voltage 5 MUTE: OFF 6 5 4 3 MUTE: ON 2 5 Ta=25℃ RL=32Ω 4 4 3 3 2 2 1 1 Output DC Voltage, VOUT (V) 1 0 0 2 0 4 6 8 10 0 Supply Voltage, Vcc (V) Output Voltage vs. Mute Control Voltage 8 6 10 0 Voltage Gain vs. Frequency 8 Ta=25℃ RL=32Ω Vcc=5V VIN=0dBV f=1kHz -10 -20 6 4 Voltage Gain, Gv (dB) 0 Output Voltage, VOUT (dBV) 4 Supply Voltage, Vcc(V) 10 -30 -40 -50 -60 2 0 -2 -4 -6 -8 -70 Ta=25℃ RL=32Ω Vcc=5V -10 -80 -90 2 0 0.4 0.8 1.2 1.6 2 -12 10 100 1k 10k 100k Frequency, F(Hz) Mute Control Voltage, VTM (V) Total Harmonic Distortion vs. Output Voltage ( I ) 10 Total Harmonic Distortion vs. Output Voltage ( II ) 10 Ta=25℃ RL=32Ω Vcc=5V Ta=25℃ RL=32Ω Vcc=3V 1 1 f=10kHz f=10kHz 0.1 0.1 f=1kHz f=1kHz 0.01 0.01 f=100Hz f=100Hz 0.001 -40 -10 0 -30 -20 Output Voltage, VOUT (dBV) 10 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 0.001 -40 -30 -10 0 -20 Output Voltage, VOUT (dBV) 10 8 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(Cont.) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 10 QW-R107-040,C 3544 LINEAR INTEGRATED CIRCUIT 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R107-040,C