'Pop-Up' related articles 1

  1. 2008/06/21 PA4201 - PUNK POP-UP NOISE KILLER
GENERAL DESCRIPTION
PA4201 (PUNK) is a low power (ICC < 1μA) monolithic CMOS mixed signal device.
PUNK’s primary function is to control power supply transition noise in audio circuits and systems.
PUNK boasts several features that make it a “one of a kind” product on the market.
Most prominent is the feature that allows the designer to implement SOFT mute on an audio line during normal operation.
PUNK is an exceptional product for multi-channel devices as it is capable of expanding the SOFT mute operation into (Dolby 5.1 DTSTM) systems .
PUNK requires few external components for its operation, working from low to medium power supply voltages of 2.7V to 5.5V.
As soon as a change in the power supply is detected, PUNK ensures that audio inputs to succeeding amplifiers are switched to a convenient low impedance voltage rail.
This causes the amplifiers to remain silent as the power supply changes state.
PUNK operates as a passive shunt device.
So the designer does not have to worry about PUNK introducing any kind of noise or distortion into the system.
While consuming less than 1μA of supply current PUNK provides more than 45dB of mute attenuation at the audio lines.
PUNK is equipped with ESD (Human Body Model) protection circuitry on the outputs.
PUNK is available as an 8L low profile 0.6mm DFN as well as the SO-8 package and is specified for operation over the -40 to +85 deg.
C temperature range.

FEATURES
* Extremely low supply current (<1μA)
* >45dB mute attenuation
* Shunt operation.
* SOFT mute during normal operation.
* Built-in expansion capability. Soft Mute out for driving additional channels.
* Instant Power UP and Power DOWN muting.
* ESD protected outputs.
* 2.7V to 5.5V supply operation.
* Compact 2 x 2 x 0.6mm 8 lead DFN and SO-8 Package

APPLICATIONS
* DFN-8
* Cell phones
* PDAs
* Portable DVD Players
* Portable MP3 Players
* Notebook Audio
* Set-top boxes
* Digital Video Recorders
* LCD TVs
* Home Theater systems
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