ANALOG PRODUCTS DIVISION

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 632-1715

www.protekanalog.com

PA4220

Pop-Up and Shutdown Noise Suppressor

95027.Rev 0.0 12/10 PATENT PENDING; CONFIDENTIAL; COVERED BY NON DISCLOSURE AGREEMENT.

NOT FOR USE IN LIFE SUPPORT SYSTEMS

FEATURES

 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.

APPLICATIONS



Cell phones



PDA’s



Portable DVD players



Portable MP3 players



Notebook Audio



Set-top boxes



Digital Video Recorders



LCD TVs



Home Theater systems

Pin Layout and Description

GENERAL DESCRIPTION

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.

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.

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.

P A 4 2 2 0 operates as a passive shunt device hence the

designer does not have to worry about the device introducing

any kind of noise or distortion into the system. It has extremely

low current consumption (<1uA).

PA4220 is equipped with ESD (Human Body Model)

protection circuitry on the outputs.

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.

Functional Diagram

Ordering Information

Temp Range

Package

Part Number

SOIC-8

PA4220DQ-T7

-40 to +85°C

DFN-6

PA4220DN-T7

Pin#

DFN-6

Pin #

SOIC-8

Description

Notes

1

1

RCS

Power ON delay capacitor

2

2

GND

Ground

3

NC

No Connect

3

4

Ch2

Channel 2 control signal

4

5

Ch1

Channel 1 control signal

6

NC

No Connect

5

7

Vcc

Vcc

6

8

Cap

Holding capacitor

NC

1

2

3

4

5

6

7

8

GND

NC

CH2

CH1

6

1

5

4

2

3

GND

CH2

CH1

DFN-6

Top View

SOIC-8

Top View

Startup

&

Shutdown

Control

PA4220

C2 = 100μF (Typ.)

C3 = 1μF (Max.)

C2

C3

CH2

CH1