Datasheet

UNISONIC TECHNOLOGIES CO., LTD
PA3428
CMOS IC
2W STEREO AUDIO
AMPLIFIER
„
DESCRIPTION
As a stereo audio speaker which is operating on a single 5V
supply, the UTC PA3428 is capable of delivering 2W of output
power per channel into 4Ω loads with less than 1% THD+N.
Way of two terminals (GAIN0 and GAIN1) can configured and
control the amplifier gain. It also provide gain settings of 2, 6, 12,
and 24V/V.
Other features include internal gain control which requires few
external components, an active-low shutdown mode input and
thermal shutdown protection.
„
FEATURES
Lead-free:
PA3428L
Halogen-free: PA3428G
* Internal Depop circuitry
* Output power at 1% THD+N
Supply voltage:5V
Delivering 2.0W into a 4Ω load
Delivering 1.2W into a 8Ω load
* Tow mode:
Bridge-tied Load (BTL),
Single-ended (SE)
* Stereo input signal
* Fully differential input
* Gain control Internally
* Differential Input fully
„
ORDERING INFORMATION
Normal
PA3428-N24-R
PA3428-N24-T
Ordering Number
Lead Free
PA3428L-N24-R
PA3428L-N24-T
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
Halogen Free
PA3428G-N24-R
PA3428G-N24-T
Package
Packing
TSSOP-24
TSSOP-24
Tape Reel
Tube
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PA3428
„
CMOS IC
PIN CONFIGURATION
GND/HS 1
GAIN0 2
GAIN1 3
LOUT+ 4
LLINEIN 5
LHPIN 6
PVDD 7
RIN 8
LOUT- 9
LIN 10
BYPASS 11
GND/HS 12
„
PA3427
24
23
22
21
20
19
18
17
16
15
14
13
GND/HS
RLINEIN
SHUTDOWN
ROUT+
RHPIN
VDD
PVDD
HP/LINE
ROUTSE/BTL
PC-BEEP
GND/HS
PIN DESCRIPTION
PIN NO
1,12,13,24
11
2
3
PIN NAME
GND/HS
BYPASS
GAIN0
GAIN1
I/O
5
LLINEIN
I
6
7,18
LPHIN
PVDD
I
I
8
RIN
I
10
LIN
I
14
PC-BEEP
I
15
SE/BTL
I
17
HP/ LINE
I
19
20
22
23
4
9
16
21
VDD
RHPIN
SHUTDOWN
RLINEIN
LOUT+
LOUTROUTROUT+
I
I
I
O
O
O
O
I
I
DESCRIPTION
Ground, connected to thermal pad directly.
Connected to voltage divider
For gain control: Bit 0
For gain control: Bit 1
Line input for Left channel, available when pin17 is held low.
Headphone input Left channel, available when pin17 is held high.
Supply voltage
Differential input for Right channel. And for single-ended inputs is also AC
ground.
Differential input for Left channel. And for single-ended inputs is also AC
ground.
PC-BEEP mode input. When at least eight continuous > 1-VPP square
waves is input to this pin, PC-BEEP is enabled.
Low for BTL mode, high for SE mode.
Input of MUX control. Being high to select the inputs of Pin6, 20, and low to
select inputs of PIN 5, 23.
Analog VDD Supply voltage
Right channel headphone input, selected when HP/LINE pin is held high.
in shutdown mode when held low, expect PC-BEEP remains active.
Headphone input right channel, available when pin17 is held low.
Positive output for Left channel in BTL mode, positive output in SE mode.
Negative output for Left channel, and high impedance in SE mode.
Negative output for Right channel, and high impedance in SE mode.
Positive output for right channel in BTL mode, positive output in SE mode.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
6
V
Power Dissipation TA≤25°С
PD
2.7
W
Operating Free-Air Temperature Range
TA
-40~+85
°С
Operating Junction Temperature Range
TJ
150
°С
Storage Temperature Range
TSTG
-65~+150
°С
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.
„
ELECTRICAL CHARACTERISTICS (TA=25°С)
PARAMETER
SYMBOL
DC ELECTRICAL CHARACTERISTICS
Supply voltage
VDD
TEST CONDITIONS
MIN
4.5
SHUTDOWN,SE/BTL,
3.5
High-Level Input voltage
VIH
HP/LINE, GAIN0, GAIN1
SHUTDOWN,SE/BTL,
Low-Level Input voltage
VIL
HP/LINE,GAIN0, GAIN1
DC Differential Output Voltage
VOUT(DIFF) VDD= 5V,Gain = 2V/V
VDD= 5V, Stereo BTL
Supply Current in Mute Mode
IDD
VDD= 5V, Stereo SE
Supply Current, Shutdown Mode
IDD(SD)
VDD= 5V
AC ELECTRICAL CHARACTERISTICS VDD = 5.0V, RL = 4Ω, unless otherwise specified
THD =1%, BTL, RL=4Ω, G=2V/V
THD =1%, BTL, RL=8Ω, G=2V/V
Output Power
POUT
THD =10%, BTL, RL=4Ω, G=2V/V
THD =10%, BTL, RL=8Ω, G=2V/V
THD =0.1%, SE, RL=32Ω
POUT =1.6W, BTL, RL= 4Ω, G=2V/V
POUT =1W, BTL, RL= 8Ω, G=2V/V
Total Harmonic Distortion Plus Noise THD+N
POUT =75mW, SE, RL=32Ω
VI=1V, BTL, RL=10kΩ, SE
Max Output Power Bandwidth
BOM
THD =5%
Power Supply Ripple Rejection
PSRR F=1kHz, BTL, G=2V/V, CBYP=1µF
Channel-to-Channel
F=1kHz
Output Separation
Line/HP Input Separation
BTL Attenuation (SE mode)
Signal-to-Noise Ratio
SNR
POUT =500mW, BTL, G=2V/V
Output Noise Voltage
eN
BTL,G=2V/V, A Weighted filter
Note: Output power is measured at the output terminals of the IC at 1kHz.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
MAX
UNIT
5
5.5
V
V
5
7.5
4
160
2
1.25
2.5
1.6
85
100
60
80
30
15
68
1
V
50
13
7
300
mV
mA
µA
W
mW
m%
kHz
V/V
80
V/V
80
85
90
45
V/V
V/V
V/V
µV(rms)
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CMOS IC
APPLICATION INFORMATION
Shutdown Mode Operating
HP/LINE
X
L
L
H
H
X: Ignore
L: Low
H: High
INPUT
SE/BTL
X
L
H
L
H
SHUTDOWN
L
H
H
H
H
AMPLIFIER
INPUT
OUTPUT
X
MUTE
LINE
BTL
LINE
SE
HEADPHONE
BTL
HEADPHONE
SE
CI (Input Capacitor)
The value of CI is important to consider as it directly affects the bass performance of the application circuit. When CI is
required to allow the amplifier to bias the input signal to the proper dc level for optimum operation, it’s value can be
calculate by this equation:
CI=1/ (2πRIFC)
RI: Input Impedance
FC: High-pass Filter’s Frequency
The low leakage tantalum or ceramic capacitors are suggested to be used as the input coupling capacitors, because
of the small leakage current of the input ca-pacitors will cause the dc offset voltage at the input to the amplifier that
reduces the operation headroom, especially at the high gain applications. It is important to let the positive side
connecting to the higher dc level of the application when using the polarized capacitors.
Gain setting (Vs Gain0, Gain1 and RI, SE/BTL)
Gain setting is determined by GAIN0 and GAIN1. The gains listed in the next table are realized by changing the taps
on the input resistors inside the amplifier which will cause the internal input impedance(R I) to be dependent on the
gain setting as we can see listed in the next table.
AV(V/V)
2
6
12
24
1
X: Ignore
GAIN0
0
0
1
1
X
UNISONIC TECHNOLOGIES CO., LTD
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GAIN1
0
1
0
1
X
SE/BTL
0
0
0
0
1
R I(kΩ)
90
45
30
15
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CMOS IC
BLOCK
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PA3428
„
CMOS IC
TYPICAL APPLICATION CIRCUIT
FOR DIFFERENTIAL INPUTS
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www.unisonic.com.tw
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PA3428
„
CMOS IC
TYPICAL APPLICATION CIRCUIT(Cont.)
FOR SINGLE-ENDED INPUTS
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www.unisonic.com.tw
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PA3428
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CMOS IC
TYPICAL CHARACTERISTICS
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PA3428
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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