PA4220
ANALO G P RO DUCTS DIVIS IO N
Pop-Up and Shutdown Noise Suppressor
FEATURES
GENERAL DESCRIPTION
PA4220 is a low power (ICC< 1μA) monolithic mixed signal
device. PA4220’s function is to control the power supply
transition noise in audio systems.
PA4220 boasts several features that make it a “one of a kind”
product on the market. Most prominent is the feature is that it
does not require any external signal to suppress POPUP
and SHUTDOWN Noise.
Extremely Low supply current (<1μA).
Shunt operation hence distortion free.
Instantaneous. Power-up and Power-down muting.
No external microcontroller signal needed.
ESD protected outputs.
1.5V to 5V supply operation.
Handle up to 3.5V RMS signal.
Compact 2 x 2 x 0.8mm 6L DFN.
Standard 8L SO-8 package.
PA4220 requires few external components for its operation,
working from low to medium supply voltages of up to 5V. The
ramp time of the supply should be greater than 50ms.
APPLICATIONS
On power-up and power-down the output of the amplifier
stage is switched to a convenient low impedance voltage rail
hence muting the amplifiers, preventing the audible pop, which
is normally heard in the headset or speakers.
Cell phones
PDA’s
Portable DVD players
Portable MP3 players
Notebook Audio
Set-top boxes
Digital Video Recorders
LCD TVs
PA4220 operates as a passive shunt device hence the
designer does not haveto worry about the device introducing
any kind ofnoise or distortioninto the system. It has extremely
low current consumption (<1uA).
Home Theater systems
PA4220 is equipped with ESD (Human Body Model)
protection circuitry on the outputs.
Pin Layout and Description
PA4220 is available as an 6L low profile 0.8mm DFN
package and 8L SO-8 package. It is specified for operation
over the -40° C to +85°C temperature range.
Pin#
Pin #
Description
Notes
DFN-6 SOIC-8
1
2
1
2
3
4
5
6
7
8
RCS
GND
NC
Power ON delay capacitor
Ground
CH1 CH2
Functional Diagram
No Connect
VCC
PA4220
3
4
Ch2
Ch1
NC
Channel 2 control signal
Channel 1 control signal
No Connect
Startup
&
Shutdown
Control
5
6
Vcc
Cap
Vcc
Holding capacitor
C2
C3
VCAP
VCC
CH1
C2 = 100μF (Typ.)
C3 = 1μF (Max.)
RCS
1
2
3
4
8
7
6
5
VCAP
6
5
4
VCC
GND
NC
Ordering Information
Package
SOIC-8
DFN-6
Temp Range
Part Number
NC
PA4220DQ-T7
PA4220DN-T7
1
2
3
CH2
CH1
-40 to +85°C
RCS
GND
CH2
DFN-6
SOIC-8
Top View
Top View
561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 632-1715
www.protekanalog.com
95027.Rev 0.0 12/10 PATENT PENDING; CONFIDENTIAL; COVERED BY NON DISCLOSURE AGREEMENT.
NOT FOR USE IN LIFE SUPPORT SYSTEMS