3544 UTC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 9
Technical content
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 1 QW-R107-040,A 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.
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.
APPLICATIONS
Devices that use the headphone output from CD-ROMs, CDs, MDs, personal computers, notebook computers, camcorders, etc. SOP-8 *Pb-free plating product number: 3544L ABSOLUTE MAXIMUM RATINGS(Ta=25¥) PARAMETER SYMBOL RATINGS UNIT Applied voltage Vmax 7.0 V Power dissipation P D 450 * mW Operating temperature Topr -25j+75 ¥ Storage temperature Tstg -55j+125 ¥ *Reduced by 4.5mW for each increase in Ta of 1¥ over 25 ¥ RECOMMENDED OPERATING CONDITIONS (Ta=25¥) PARAMETER SYMBOL MIN. TYP. MAX. UNIT Power supply voltage Vcc 2.8 6.5 V
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 2 QW-R107-040,A BLOCK DIAGRAM 8 7 65 12 34 BIAS 90K 90K 6dB 6dB TSD MUTE OUT1 MUTE IN1 GND Vcc OUT2 BIAS IN2
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 3 QW-R107-040,A PIN DESCRIPTIONS PIN NO. PIN NAME I/O PIN VOLTAGE INTERNAL EQUIVALENT CIRCUIT FUNCTION OUT1 OUT2 O O 2.1V 2.1V (Vcc=5V) Vcc 10k Output pin MUTE I 0.1V (When open) Vcc 190k Mute control pin (set to low for prevention of popping noise when power is turned on and off). Operating: High Muting: Low(open) IN1 IN2 I I 2.1V 2.1V (Vcc=5V) Vcc 180k BIAS Input pin BIAS I/O 2.1V (Vcc=5V) Vcc 60k 60k BIAS Bias pin(the external 47ȰF capacitor also serves as the anti-pop time constant, therefore make the proper considerations be changing it).
4 GND I -
5 Vcc I -
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 4 QW-R107-040,A ELECTRICAL CHARACTERISTICS (Ta=25¥,Vcc=5.0V,RL=32Ȥ,VIN= -6dBV, f=1kHz) PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT Quiescent current I Q V IN=0Vrms 4 7 10 mA Mute pin control voltage V TM 0.3 0.7 1.6 V Voltage gain Gvc 4 6 8 dB Voltage gain difference between channels ¶Gvc -0.5 0 0.5 dB Total harmonic distortion THD BW=20j20kHz 0.02 0.1 % Rated output 1 Po 1 RL=32Ȥ,THD<0.1% 25 31 mW Rated output 2 Po 2 RL=16Ȥ,THD<0.1% 50 62 mW Output noise voltage V NO BW=20j20kHz,Rg=0Ȥ -93 -85 dBV Channel separation CS Rg=0Ȥ 82 90 dB Mute attenuation ATT Rg=0Ȥ 70 80 dB Ripple rejection RR f RR=100Hz,VRR= -20dBV 50 57 dB MEASUREMENT CIRCUIT 8 7 65 12 34 BIAS 90K 90K 6dB 6dB TSD MUTE OUT1 MUTE IN1 GND Vcc OUT2 BIAS IN2 V V SW5 VIN2 47DŽ+ 330DŽ SW7 V7AC + CVcc 10DŽASW8B IQ
12 SW8A
330DŽ SW1 V1AC VTM SW3 VIN1
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 5 QW-R107-040,A MEASUREMENT CONDITIONS SW TABLE SIGNAL SW1 SW3 SW5 SW7 SW8A SW8B MONITOR CONDITIONS IQ 1 1 1 1 2 OFF I Q VTM GVC 1 2 2 1 2 ON V1AC,V2AC f=1kHz,VIN1/2=-6dBV, VTM=1.6V ¶Gvc G V C 1 – G V C 2 THD 1 2 2 1 2 ON V1AC,V2AC fin=1kHz,VIN1/2= -6dBV, VTM=1.6V Po1 1 2 2 1 2 ON V1AC,V2AC fin=1kHz,VIN1/2= -6dBV, VTM=1.6V Po2 2 2 2 2 2 ON V1AC,V2AC fin=1kHz,VIN1/2= -6dBV, VTM=1.6V VNO 1 1 1 1 2 ON V1AC,V2AC CS 1 ON ON V1AC,V2AC V1AC,V2AC fin=1kHz,VIN2= -6dBV, VTM=1.6V fin=1kHz,VIN1= -6dBV, VTM=1.6V ATT 1 2 2 1 2 ON V1AC,V2AC fin=1kHz,VIN1/2= -6dBV, VTM=0.3VB RR 1 1 1 1 1 ON V1AC,V2AC VRR= -20dBV, fRR=100Hz CIRCUIT OPERATION Rising edge timing VMUTE OUT Vcc B C Play periodRise period Rise periodA A and therefore possesses a time constant,so be careful of the timing). 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 C: MUTE start time(also possesses a time constant like the MUTE release time).
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 6 QW-R107-040,A APPLICATION EXAMPLE 8 7 65 12 34 BIAS 90K 90K 6dB 6dB TSD MUTE OUT1 MUTE IN1 GND Vcc OUT2 BIA S IN2 VMUTE H:Active L:Mute 100k 1DŽ VIN1 VIN247DŽ+ 330DŽ VDD 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 Ȥ,it can be determined by the formula below,but take into consideration the fluctuations,ambent temperature,etc.(a multi-layered ceramic capacitor is recommended). C 3 ( C 5 ) = 1 / ( 2 ȴ180kȤf) (2)BIAS capacitor(C6) 4 7 ȰF when Vcc=5V,and 33ȰF 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 Ȥ 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 R L(assuming that for output protection or current limiting,a resistor Rx will be inserted),it can be determined by the formula below. (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. G v c = 6 + 2 0 l o g ( 9 0 k Ȥ/(90kȤ+R3))ŀ dB ł
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 7 QW-R107-040,A ELECTRICAL CHARACTERISTIC CURVES Fig.1 Quiescent current vs. power supply voltage Fig.2 Pin DC current vs. power supply voltage 0 2 468 1 0 SUPPLY VOLTAGE: Vcc (V) QUIESCENT CURRENT: IQ (m Ta=25Ċ RL=32Ƹ SUPPLY VOLTAGE:Vcc(V) BIAS DC VOLTAGE: V BIAS (V) 0 246 8 10 OUTPUT DC VOLTAGE: Vo (V) Ta=25Ċ RL=32Ƹ MUTE: OFF MUTE: ON -10 -12 100 1k 100k 10k VOLTAGE GAIN:Gvc(dB) Fig.4 Voltage gain vs.frequency Ta=25Ċ RL=32Ƹ Vcc=5V 0 0.4 -10 -20 -30 -40 -50 -60 -70 -80 -90 0.8 1.2 1.6 2 MUTE CONTROL VOLTAGE VTM Fig.3 Output voltage vs. MUTE control voltage OUTPUT VOLTAGE: V OUT (dBV) Ta=25Ċ RL=32Ƹ Vcc=5V V IN=0dBV f=1kHz
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 8 QW-R107-040,A 0.1 0.01 0.001 -40 -30 -20 10-10 0 OUTPUT VOLTAGE: Vo (dBV) Fig.5 Total harmonic distortion vs. output voltage ( I ) Ta=25Ċ RL=32Ƹ Vcc=5V f=10kHz f=1kHz f=100Hz TOTAL HARM ONIC DISTORTION:THD(% ) 10 0.1 0.01 0.001 -40 -30 -20 10-10 0 OUTPUT VOLTAGE: Vo (dBV) Fig.6 Total harmonic distortion vs. output voltage ( II ) f=10kHz f=1kHz f=100Hz TOTAL HARMONIC DISTORTION:THD(%) Ta=25Ċ RL=32Ƹ Vcc=3V Fig.7 Total harmonic distortion vs. output voltage (III) Fig.8 Total harmonic distortion vs. output voltage( IV ) Fig.9 Channel separation vs.frequency Fig.10 MUTE attenuation vs.frequency 0.1 0.01 0.001 -40 -30 -20 10-10 0 OUTPUT VOLTAGE: Vo (dBV) f=10kHz f=1kHz f=100Hz TOTAL HARM ONIC DISTORTION:THD (% ) Ta=25 Ċ RL=16Ƹ Vcc=5V 0.1 0.01 0.001 -40 -30 -20 10-10 0 OUTPUT VOLTAGE: Vo (dBV) f=10kHz f=1kHz f=100Hz TOTAL HARMONIC DISTORTION:THD (%) Ta=25 Ċ RL=16Ƹ Vcc=3V 120 100 100 1k 100k 10k FREQUENCY: f (Hz) CHANNEL SEPARATION: CS (dB) Ta=25 Ċ RL=32Ƹ Rg=0 Ƹ Vcc=5V 100 100 1k 100k 10k FREQUENCY: f (Hz) MUTE ATTENUTION: ATT (dB) VTM=OPEN RL=32Ƹ VIN=0dBV Vcc=5V C-BIAS: 33 DŽ F C-BIAS: 100 DŽ F C-BIAS: 47 DŽF
UTC 3544 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 9 QW-R107-040,A Fig.11 Ripple rejection vs.frequency Fig.12 Ripple rejection vs.power supply voltage 100 1k 100k 10k FREQUENCY: f (Hz) RIPPLE REJECTION: RR (dB) Ta=25Ċ VRR= -20dBV Rg=0Ƹ Vcc=5V 0 2 100 468 1 0 SUPPLY VOLTAGE: Vcc (V) RIPPLE REJECTION:RR (dB) Ta=25Ċ VRR= -20dBV RL=32Ƹ Rg=0Ƹ fRR=100Hz 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.