Datasheet

UNISONIC TECHNOLOGIES CO., LTD
PA7493
CMOS IC
2W X 2 CLASS AB AUDIO
POWER AMPLIFIER (WITH
DC_VOLUME CONTROL)

DIP-16
DESCRIPTION
UTC PA7493 provides precise DC volume control, and a stereo
bridged audio power amplifiers capable of producing 2W into 4Ω 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.

SOP-16
FEATURES
* Stereo switch able bridged/single-ended power amplifiers
* Output power 2W × 2 (VCC=6V, THD=1%, RL=4Ω)
* Low harmonics distortion
* Include 32 steps volume controller by DC voltage with ysteresis
* “Click and pop” suppression circuitry
* Low current consumption in SHUTDOWN Mode(0.7μA)
* Thermal shutdown

ORDERING INFORMATION
Ordering Number
Lead Free
PA7493L-D16-T
-

Halogen Free
PA7493G-D16-T
PA7493G-S16-R
Package
Packing
DIP-16
SOP-16
Tube
Tape Reel
MARKING
DIP-16
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Copyright © 2015 Unisonic Technologies Co., Ltd
SOP-16
1 of 7
QW-R502-113.D
PA7493
CMOS IC
PIN CONFIGURATION

SHUTDOWN
1
16
+OUT1
VCC
2
15
VCC
DC Vol
3
14
-OUT1
VOUT1
4
13
BYPASS
VIN1
5
12
SE/BTL
VIN2
6
11
-OUT2
VOUT2
7
10
VCC
GND
8
9
UTC
PA7493
+OUT2
PIN DESCRIPTION

PIN NO
1
2
3
4
5
6
7
8
9
10
11
PIN NAME
SHUTDOWN
VCC
DC Vol
VOUT1
VIN1
VIN2
VOUT2
GND
+OUT2
VCC
-OUT2
I/O
I
12
SE/ BTL
I
13
14
15
16
BYPASS
-OUT1
VCC
+OUT1
O
O
I
I
I
I
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
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QW-R502-113.D
PA7493

CMOS IC
BLOCK DIAGRAM
VOUT1
Rf
VIN1
RI
20K
BYPASS
-OUT1
20K
+OUT1
AMP1N
AMP1P
Voltage
Bypass and
De-Pop Noise
32 steps
DC Control
Volume
Logic
Control
SE/BTL
SHUTDOWN
VIN2
VOUT2
Rf
RI
VCC
20K
Power
Management
-OUT2
20K
+OUT2
AMP2N
AMP2P
GND
DC Vol
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QW-R502-113.D
PA7493

CMOS IC
ABSOLUTE MAXIMUM RATINGS
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
°C
Storage Temperature
TSTG
-65~+150
°C
Notes: 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°C, 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
μA
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=20KΩ
-1
0
+1
dB
DC Vol=5V,F=1KHz
-1
0
+1
Volume Control Range
VCTRL
dB
DC Vol =16.875% VCC
-46
-47
-48
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 =32Ω
mW
THD=10%
100
110
120
Total Harmonic Distortion Plus
THD+N POUT＝50mW, RL=32Ω
0.03
0.05
0.07
%
Noise
VRIPPLE=200mVrms,
58
dB
Power Ripple Rejection Ratio
PSRR
CB =1μF, Fin=120Hz
POUT=75mW, RL=32Ω,
102
dB
Signal to Noise Ratio
SNR
A-weight
Channel Separation
Xtalk
CB=1μF, 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
1.4
1.6
1.8
THD+N=1%, RL =4Ω
THD+N=10%, RL =4Ω
1.8
2.0
2.1
W
Maximum Output Power
POUT
THD+N=1%, RL =4Ω, VCC=6V
1.9
2.0
2.2
THD=1%, RL =8Ω
1.0
1.1
1.2
THD+N=10%, RL =8Ω
1.2
1.4
1.6
POUT＝0.2W, RL=4Ω
0.03
0.05
0.07
Total Harmonic Distortion Plus
THD+N
%
Noise
POUT =1W, RL =4Ω
0.06
0.08
0.15
VRIPPLE=200mVrms , RL =8Ω,
74
dB
Power Ripple Rejection Ratio
PSRR
CB =1μF, Fin=120Hz
Signal to Noise Ratio
SNR
POUT =1.1W, RL =8Ω, A-weight
93
dB
Channel Separation
Xtalk
CB=1μF, Fin=1kHz
85
88
91
dB
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QW-R502-113.D
PA7493

CMOS IC
FUNCTION DESCRIPTION
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 0.7μA, 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 10KΩ 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 2.2μF, 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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QW-R502-113.D
PA7493

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
CMOS IC
VOLUME CONTROL TABLE
Voltage Range (% of VCC)
Low
High
Recommended
77.5% 100.00%
100.000%
75.0% 78.5%
76.875%
72.5% 76.25%
74.375%
70.0% 73.75%
71.875%
67.5% 71.25%
69.375%
65.0% 68.75%
66.875%
62.5% 66.25%
64.375%
60.0% 63.75%
61.875%
57.5% 61.25%
59.375%
55.0% 58.75%
56.875%
52.5% 56.25%
54.375%
50.0% 53.75%
51.875%
47.5% 51.25%
49.375%
45.0% 48.75%
46.875%
42.5% 46.25%
44.375%
40.0% 43.75%
41..875%
37.5% 41.25%
39.375%
35.0% 38.75%
36.875%
32.5% 36.25%
34.375%
30.0% 33.75%
31.875%
27.5% 31.25%
29.375%
25.0% 28.75%
26.875%
22.5% 26.25%
24.375%
20.0% 23.75%
21.875%
17.5% 21.25%
19.375%
15.0% 18.75%
16.875%
12.5% 16.25%
14.375%
10.0% 13.75%
11.875%
7.5% 11.25%
9.375%
5.0%
8.75%
6.875%
0.0%
6.25%
0.000%
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
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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
5.000
3.844
3.719
3.594
3.469
3.344
3.219
3.094
2.939
2.844
2.719
2.594
2.469
2.344
2.219
2.094
1.939
1.844
1.719
1.594
1.469
1.344
1.219
1.094
0.939
0.844
0.719
0.594
0.469
0.344
0.000
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
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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QW-R502-113.D
PA7493

CMOS IC
TYPICAL APPLICATION 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.
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QW-R502-113.D