PA4402 [PROTEC]
Click-Pop Suppression Device; 点击噼噗声抑制装置
| 型号： | PA4402 |
| 厂家： | 
PROTEK DEVICES |
| 描述： | Click-Pop Suppression Device |
| 文件： | 总7页 (文件大小：428K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
FEATURES
GENERAL DESCRIPTION
The PA4402 provides click-pop suppression for devices that
lack a click-less/pop-less startup or shutdown. The PA4402 is
placed between the codec and the output coupling capacitor.
12V (typical) operation
3V RMS Capability
Power-Up and Power-Down “POP” suppression
ESD protected outputs
Series operation
Only 1 external capacitor required
Ron (On resistance): 3.75 ohms
Ron Flatness: <0.2 ohms
Total Harmonic Distortion: <1%
Current drain: <5mA
The click-pop noise is generated at the coupling capacitors
while the system is starting up as well as shutting down.
The PA4402 controls the ramping of the DC voltage into the
coupling capacitors thus reducing the click-pop noise
generated during the startup and shutdown.
The start time can be controlled or changed using an external
capacitor.
ESD protection circuits are provided at the inputs and outputs
of the device.
APPLICATIONS
Portable DVD players
Set-top boxes
Car Audio
High End Audio
Televisions
Stereo Systems
Digital Video Recorders
LCD TVs
The PA4402 consumes less than 5mA of current and
provides a THD of less than 1%.
FUNCTIONAL DIAGRAM
Home Theater systems
Input
Pre
Amp
Pin Layout and Description
Vcc
Output
Output
Startup
&
Shutdown
Control
4402DN
XXXX
Input
Pre
Amp
4402DN
Figure 1: Functional block diagram of PA4402
SEL Logic Table
Pin
1
Symbol
Vcc
Designation
Voltage
System Voltage
12V
SEL Status
GND
2
In1
Audio Input 1
3
NC
No Connect (Leave OPEN)
No Connect (Leave OPEN)
Audio Input 2
4
NC
VCC
>12.5V
5
In2
Ordering Information
6
SEL
GND
Out2
NC
See SEL Logic Table
Ground
7
Temp Range
Package
Part Number
8
Audio Output 2
9
No Connect (Leave OPEN)
No Connect (Leave OPEN)
Audio Output 1
-40 to 85 °C
12 Lead DFN
PA4402-T7
10
11
12
NC
Out1
CEXT
External Capacitor
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95029. Rev2. 2/2012;
NOT FOR USE IN LIFE SUPPORT SYSTEMS
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
ABSOLUTE MAXIMUM RATINGS
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
(All Voltages are referenced to GND)
V
.....................................................................................+15V
CC
Continuous Current (IN_, OUT_).....................................±150mA
Continuous Current (All Other Pins) .................................±20mA
Continuous Power Dissipation (T
= +70°C)
A
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
°C
.
Unless otherwise specified, VCC=12V, SEL = GND,TA = Ambient Temperature = 25
Limit
Symbol
Parameter
Condition
Unit
Min
Typical
Max
15.0
5
VCC
IDD
Power Supply
Normal Operation
12.0
V
mA
ºC
Ω
Supply Current
Normal Operation
Normal Operation
1uF on Cext
TA
Ambient Temperature
ON Resistance
-40
+85
5
RON
3.75
15
RFLAT(ON) ON Resistance Flatness
m
Ω
Over Input Voltage Range
RL = 600
f = 1kHz
f = 20kHz
Ω, VSIG = 2VRMS
THD
Total Harmonic Distortion
.020
1
%
XTALK
QIRR
VSIG
Crosstalk (on)
-100
-108
dB
dB
Off Isolation
f = 20kHz RL= 600
Normal Operation
HBM
Ω
Analog Signal Range
ESD Protection
Bandwidth
3.0
VRMS
kV
VESD
fCO
4
>100
9.3
kHz
VCC
VUVLO
Power Off Threshold
VCC Falling
9.0
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95029. Rev2. 2/2012;
NOT FOR USE IN LIFE SUPPORT SYSTEMS
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
PRODUCT DESCRIPTION
Figure 2 shows the normal setup of a Pre Amplifier system. Since the system is built on a single ended power supply the outputs
of the pre-amplifier need to be routed through a bypass capacitor to get rid of the DC bias.
Pre
+
Amp
Pre
+
Amp
Figure 2: Normal setup for a pre amplifier output
When the power supply to the system is turned ON there is a spike in the output of the system because of the charging of
various components in the system. This spike is called a “Click or Pop Noise”. When this click/pop noise passes through the
Power Amplifiers, the noise is amplified and listeners hear an audible ‘pop’ which causing undesired noise. The reverse
operation happens when the system is powering down. The connection diagram is shown in Figure 3. The Powering Up
sequence is shown in Figure 4 and the Powering Down sequence is shown in Figure 5. The audible POP noise heard can be
caused by the powering up/down of the pre amp and/or CODEC devices. The PA4402 placed at the final output stage can
suppress these noises.
CONNECTION DIAGRAM
The PA4402 will be placed after the pre-amplifier and before the output bypass capacitors.
VCC
Pre
Amp
+
IN
OUT
Pre
Amp
+
IN
OUT
Figure 3: Typical Connection Configuration for PA4402
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95026. Rev.2. 02/2012
NOT FOR USE IN LIFE SUPPORT SYSTEMS
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
APPLICATION INFORMATION
Figure 4: Power Up sequence waveforms
Channel 1 (yellow waveform) is the rise of the 12V power supply.
Channel 2 (blue waveform) is the waveform at the bypass capacitor input plate.
Channel 4 (green waveform) is the waveform at the bypass capacitor output plate without the PA4402.
Channel 3 (magenta waveform) is the waveform at the bypass capacitor output plate with the PA4402.
In Figure 3, the audible POP noise would be as high as 7.2V (Channel 4) and may also swing in the negative direction as well
creating a Pk-Pk voltage of 12V, creating a loud undesirable POP noise. This noise is minimized on Channel 3 using the
PA4402. As the Turn-On time is about 172mS (with a 1 µF on CEXT), thus suppressing the POP noise during power up.
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95026. Rev.2. 02/2012
NOT FOR USE IN LIFE SUPPORT SYSTEMS
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
Figure 5: Power Down sequence waveforms
Channel 1 (yellow waveform) is the fall of the 12V power supply.
Channel 2 (blue waveform) is the waveform at the bypass capacitor input plate.
Channel 4 (green waveform) is the waveform at the bypass capacitor output plate without the PA4402.
Channel 3 (magenta waveform) is the waveform at the bypass capacitor output plate with the PA4402.
In Figure 4, the audible POP noise can be as high as 4.8V (Channel 4) with a negative swing without using the PA4402. When
the PA4402 is active this negative swing is suppressed to less than 200mV (Channel 3) in this case.
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95026. Rev.2. 02/2012
NOT FOR USE IN LIFE SUPPORT SYSTEMS
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
Test Circuit for Turn-On time vs. CEXT and Turn-Off Time vs. CEXT
VCC
VINx
INx
VOUTx
90%
VOUTx
Control
Element
50%
50%
CEXT
10%
tON
tOFF
R1
1MΩ
C1
CEXT (µF)
tON (mS)
tOFF (mS)
1
172
362
512
636
19
23
25
34
2.2
3.3
4.7
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95026. Rev.2. 02/2012
NOT FOR USE IN LIFE SUPPORT SYSTEMS
PA4402
Click-Pop Suppression Device
ANALOG PRODUCTS DIVISION
Package Outline and Dimensions DFN-12
MILLIMETERS
Dim
L1
MIN
3.90
2.40
0.85
0.25
0.55
TYP
4.00
2.50
0.90
0.30
0.60
0.203
0.65
MAX
4.10
2.60
0.95
0.35
0.65
P1
P2
P3
L1
L2
L3
p
P1
p
L2
4402DN
P2
XXXX
1
BOTTOM VIEW
TOP VIEW
0.35mm
0.65mm
P3
1.0mm
L3
SIDE VIEW
2.40mm
Recommended Land Pattern
Tape and Reel Specifications
Reel Dia
A0
B0
K0
D
E
F
W
P0
P2
P
t-max
0.25
178 (7”)
2.73±0.10
4.85.00±0.10
0.28±0.10
1.50±0.10
1.75±0.10
5.50±0.05
12.00±0.30
4.00±0.10
2.00±0.05
4.00±0.10
10 Pitches Cumulative
Tolerance on Tape± 0.2
P0
P2
D
t
E
F
Pin 1
indicated
by Dot
Top cover tape
A0
W
K0
B0
P
Life Support Policy
PROTEK ANALOG'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF PROTEK DEVICES.
2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288
www.protekdevices.com
95026. Rev.2. 02/2012
NOT FOR USE IN LIFE SUPPORT SYSTEMS
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