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UNISONIC TECHNOLOGIES CO., LTD PA7493
2W X 2 CLASS AB AUDIO POWER AMPLIFIER (WITH DC_VOLUME CONTROL)
DESCRIPTION
UTC PA7493 provides precise DC volume control, and a stereo bridged audio power amplifiers capable of producing 2W into 4 as a monolithic integrated circuit. In stand-by the power consumption is very low. UTC PA7493 combines a stereo single-end (SE) mode for headphone drive into a single chip and a stereo bridge-tied loads (BTL) mode for speaker drive(both modes are easily switched by the SE/BTL input control signal) to simplify the audio system design. Package size is not occupies PCB space cause the built-in over-temperature protection. It is suitable for small or portable products.
CMOS IC
*Pb-free plating product number: PA7493L
FEATURES
* Stereo switch able bridged/single-ended power amplifiers * Output power 2W x 2 (VCC=6V, THD=1%, RL=4) * Low harmonics distortion * Include 32 steps volume controller by DC voltage with hysteresis * "Click and pop" suppression circuitry * Low current consumption in SHUTDOWN Mode(0.7A) * Thermal shutdown
ORDERING INFORMATION
Ordering Number Normal Lead Free Plating PA7493-D16-T PA7493L-D16-T Package DIP-16 Packing Tube
www.unisonic.com.tw Copyright (c) 2007 Unisonic Technologies Co., Ltd
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PA7493
PIN CONFIGURATION
1 2 3 4 5 6 7 8 UTC PA7493 16 15 14 13 12 11 10 9 SHUTDOWN VCC DC Vol VOUT1 VIN1 VIN2 VOUT2 GND +OUT1 VCC -OUT1 BYPASS SE/BTL -OUT2 VCC +OUT2
CMOS IC
PIN DESCRIPTION
PIN NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME SHUTDOWN VCC DC Vol VOUT1 VIN1 VIN2 VOUT2 GND +OUT2 VCC -OUT2 SE/BTL BYPASS -OUT1 VCC +OUT1 I/O I I I I I I O O I O O O DESCRIPTION When this pin connected to the VCC entire IC into the shutdown mode Supply voltage input pin DC Volume control input Output of Channel 1 for external feedback circuit Input of Channel 1 audio Input of Channel 2 audio Output of Channel 2 for external feedback circuit Ground Output (+) of Channel 2 Supply voltage input Output (-) of Channel 2 Output mode select, which is connected to the VCC for SE mode or GND for BTL mode Internal bias reference bypassing Output (-) of Channel 1 Supply voltage input Output (+) of Channel 1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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PA7493
BLOCK DIAGRAM
VOUT1 Rf VIN1 RI 20K 20K
CMOS IC
-OUT1
AMP1N AMP1P
+OUT1
BYPASS
Voltage Bypass and De-Pop Noise 32 steps DC Control Volume
Logic Control
SE/BTL
VIN2 VOUT2 Rf RI Power Management GND 20K 20K
SHUTDOWN
-OUT2
VCC
AMP2N AMP2P
+OUT2
DC Vol
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www.unisonic.com.tw
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PA7493
ABSOLUTE MAXIMUM RATINGS
CMOS IC
PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC 0~7 V Input Voltage VIN -0.3~VCC+0.3 V Input Current IIN -10~+10 mA Operating Temperature TOPR -40~+85 Storage Temperature TSTG -65~+150 Note: 1. 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. 2. Input pins surge current can be reached 100mA will not induce the CMOS latched up.
ELECTRICAL CHARACTERISTICS
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT FOR ENTIRE IC (VCC=5V, TA=25 , unless otherwise specified.) Supply Voltage VCC 3 5 6 V SE MODE 6 8 12 Quiescent Power Supply Current ICC mA BTL MODE 8 10 14 Shutdown Current ISD SHUTDOWN=ON 0.2 0.7 1 A SHUTDOWN 0.5 0.6 Vcc High Level VIH SE/BTL 0.8 0.9 Vcc Threshold Voltage SHUTDOWN 0.2 0.3 Vcc Low Level VIL SE/BTL 0.1 0.2 Vcc FOR VOLUME ATTENUATORS (VCC=5V, TA=25 , unless otherwise specified.) Two Channels Gain Error Gerr RIN=RF=20K -1 0 +1 dB DC Vol=5V,F=1KHz -1 0 +1 dB Volume Control Range VCTRL -46 -47 -48 DC Vol =16.875% VCC BTL -78 dB Mute Attenuation AM VMUTE=5V SE -78 dB FOR SINGLE-ENDED MODE OPERATION (VCC=5V, bandwidth = 22~22 KHz, Unless otherwise specified.) THD=1.0% 80 85 90 Maximum Output Power POUT RL =32 mW THD=10% 100 110 120 Total Harmonic Distortion Plus THD+N POUT 50mW, RL=32 0.03 0.05 0.07 % Noise VRIPPLE=200mVrms, 58 dB Power Ripple Rejection Ratio PSRR CB =1F, Fin=120Hz POUT=75mW, RL=32, 102 dB Signal to Noise Ratio SNR A-weight Channel Separation Xtalk CB=1F, Fin=1kHz 77 80 83 dB FOR BRIDGED MODE OPERATION (VCC = 5V, bandwidth = 22~22 KHz, Unless otherwise specified.) Output Offset Voltage VO(OFF) VIN=0V, No Load -50 5 50 mV THD+N=1%, RL =4 1.4 1.6 1.8 THD+N=10%, RL =4 1.8 2.0 2.1 W Maximum Output Power POUT THD+N=1%, RL =4, VCC=6V 1.9 2.0 2.2 THD=1%, RL =8 1.0 1.1 1.2 1.2 1.4 1.6 THD+N=10%, RL =8 POUT 0.2W, RL=4 0.03 0.05 0.07 Total Harmonic Distortion Plus THD+N % Noise POUT =1W, RL =4 0.06 0.08 0.15 VRIPPLE=200mVrms , RL =8, 74 dB Power Ripple Rejection Ratio PSRR CB =1F, Fin=120Hz Signal to Noise Ratio SNR POUT =1.1W, RL =8, A-weight 93 dB Channel Separation Xtalk CB=1F, Fin=1kHz 85 88 91 dB
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PA7493
FUNCTION DESCRIPTION
CMOS IC
POWER SUPPLY The UTC PA7493 operating voltage range is from 3V to 6V. In general, the 5V operating voltage is recommended. When the supply voltage less than 3V, the IC can work properly but the distortion will rise. The higher stand-by current consumption will rise the chip surface temperature after the operating voltage over 6.5V. SHUTDOWN After powering on the UTC PA7493, connects the SHUTDOWN pin to VCC will force the chip into shutdown mode. At the shutdown mode, the total current consumption is less than 0.7A, and all of the input/output pins no voltage output. The chip is back to the normal operation when the SHUTDOWN pin sets to GND. SHUTDOWN PIN VCC GND OUTPUT STATE SHUTDOWN ON Normal
INPUT GAIN ADJUST The output gain of the UTC PA7493 can be adjusted by the external resistor. 0dB gain setting is recommended in normal operation, please refer the application circuit. If the source output level is not so high (ex :< 2VPP), input gain can be increased to get the proper volume. The minimum value of the input series resistance is 10K for the modest input impedance. To make sure the input stage not distorted by overload, please confirm the input signal level. For the gain set please refer the following table: Operating Voltage VCC=3V VCC=5V Input Gani=-6db VIN<5VPP VIN<8VPP Input Gain=0db VIN<2.5VPP VIN<4VPP Input Gani=+6db VIN<1.25VPP VIN<2VPP
SE/BTL MODE SWITCHING The UTC PA7493 has two output modes, SE(Single-Ended) or BTL(Bridge-Tied Load). To drive a speaker load, set to the BTL mode is recommended for getting the more power output. Driving a headphone load, we suggest setting to SE mode and turn-off the un-work amplifier to decrease the stand-by power consumption. Switching between the SE and BTL modes is controlled by the SE/BTL pin, please refer the following table: SE/BTL VCC GND MODE SE BTL
CLICK AND POP SURPPRESS A power amplifier uses single supply voltage may cause noises on the output port during the power-on period. It is because of the output DC potential level needs time to stable on 1/2Vcc, the period is relative with the capacitor on the BYPASS pin. The higher capacitor value will extend the stable time and also suppress the noise during the power-on period. At the supply voltage is 5V and the capacitor is 2.2F, the stable time is around 300ms. The value of the BYPASS capacitor also relatives with the DC blocking capacitor connected at the input terminal. In general condition the time constant of DC blocking capacitor should be less than the CB stable time. Recommend parts values please refer the application circuit.
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PA7493
VOLUME CONTROL TABLE
Gain (dB) 0 -1 -2 -3 -4 -5 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 -32 -34 -36 -39 -42 -45 -47 -51 -56 -61 -66 -78 Voltage Range (% of VCC) Low 77.5% 75.0% 72.5% 70.0% 67.5% 65.0% 62.5% 60.0% 57.5% 55.0% 52.5% 50.0% 47.5% 45.0% 42.5% 40.0% 37.5% 35.0% 32.5% 30.0% 27.5% 25.0% 22.5% 20.0% 17.5% 15.0% 12.5% 10.0% 7.5% 5.0% 0.0% High 100.00% 78.5% 76.25% 73.75% 71.25% 68.75% 66.25% 63.75% 61.25% 58.75% 56.25% 53.75% 51.25% 48.75% 46.25% 43.75% 41.25% 38.75% 36.25% 33.75% 31.25% 28.75% 26.25% 23.75% 21.25% 18.75% 16.25% 13.75% 11.25% 8.75% 6.25%
Recommended
CMOS IC
Voltage Range (VCC = 5) Low 3.875 3.750 3.625 3.500 3.375 3.250 3.125 3.000 2.875 2.750 2.625 2.500 2.375 2.250 2.125 2.000 1.875 1.750 1.625 1.500 1.375 1.250 1.125 1.000 0.875 0.750 0.625 0.500 0.375 0.250 0.000 High 5.000 3.938 3.813 3.688 3.563 3.438 3.313 3.188 3.063 2.938 2.813 2.688 2.563 2.438 2.313 2.188 2.063 1.938 1.813 1.688 1.563 1.438 1.313 1.188 1.063 0.937 0.812 0.687 0.562 0.437 0.312
Recommended
Voltage Range (VCC = 3) Low 2.325 2.250 2.175 2.100 2.025 1.950 1.875 1.800 1.725 1.650 1.575 1.500 1.425 1.350 1.275 1.200 1.125 1.050 0.975 0.900 0.825 0.750 0.675 0.600 0.525 0.450 0.375 0.300 0.225 0.150 0.000 High 3.000 2.363 2.288 2.213 2.138 2.063 1.988 1.913 1.838 1.763 1.688 1.613 1.538 1.463 1.388 1.313 1.238 1.163 1.088 1.013 0.937 0.862 0.787 0.712 0.637 0.562 0.487 0.412 0.337 0.262 0.187
Recommended
100.000% 76.875% 74.375% 71.875% 69.375% 66.875% 64.375% 61.875% 59.375% 56.875% 54.375% 51.875% 49.375% 46.875% 44.375% 41..875% 39.375% 36.875% 34.375% 31.875% 29.375% 26.875% 24.375% 21.875% 19.375% 16.875% 14.375% 11.875% 9.375% 6.875% 0.000%
5.000 3.844 3.719 3.594 3.469 3.344 3.219 3.094 2.969 2.844 2.719 2.594 2.469 2.344 2.219 2.094 1.969 1.844 1.719 1.594 1.469 1.344 1.219 1.094 0.969 0.844 0.719 0.594 0.469 0.344 0.000
3.000 2.306 2.231 2.156 2.081 2.006 1.931 1.856 1.781 1.706 1.631 1.556 1.481 1.406 1.331 1.256 1.181 1.106 1.031 0.956 0.881 0.806 0.731 0.656 0.581 0.506 0.431 0.356 0.281 0.206 0.000
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www.unisonic.com.tw
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PA7493
TYPICAL APPLICATION CIRCUIT
CMOS IC
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.
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www.unisonic.com.tw
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