مدار مجتمع (آی سی) آی‌سی صوتی ویژه

Product Attributes

Introduction

The MAX9892 is an audio click-and-pop eliminator for portable multimedia devices. Operating from a 1.7V to 3.6V supply, the MAX9892 connects to the output of the existing system amplifier and provides a low-impedance path to ground during startup and shutdown. The inputs INL and INR accept voltage swings from VDD to 5.5V below VDD. The power-up and power-down transients are shunted to ground to prevent clicks and pops from becoming audible. The MAX9892 features two low-impedance analog switches controlled by MUTE that opens and closes the switches. The switches are open during normal operation and have no impact on the output signal. During startup and shutdown of the amplifier, the MAX9892 can be activated to short the outputs to ground and prevent clicks and pops from pulling current through the headphones. The MAX9892 is available in 6-bump UCSP (1mm × 1.52mm × 0.6mm) and 6-pin μDFN (2mm × 2mm × 0.75mm) packages. The MAX9892 is specified over the -40°C to +85°C temperature range. The MAX9892 is the second-generation click-and-pop eliminator designed to be used with conventional headphone amplifiers. The MAX9892 works by adding a low-impedance current path from the headphone side of the DC-blocking capacitor to ground. Drive MUTE low when turning off the amplifier, and high when enabling the amplifier. A short turn-on time allows the switches in the MAX9892 to close before the DC-blocking capacitors have significantly discharged, eliminating clicks and pops at amplifier turn-off. An adjustable turn-off time allows the delay to be set to mask all clicks and pops during amplifier turn-on. The MAX9892 features a SET input that allows the turnoff time to be adjusted from 1ms to 1000ms to match the click-and-pop profile of the amplifier startup.

Features

• Distortion-Free, Click-and-Pop Elimination
• Less than 1μA Supply Current
• 1.7V to 3.6V Single-Supply Operation
• Tiny Packages: 6-Bump UCSP (1mm × 1.52mm × 0.6mm), 6-Pin μDFN (2mm × 2mm × 0.75mm)

Applications

• Mobile Phones
• Smart Phones
• Mobile Internet Devices
• Portable Gaming Consoles
• Portable Media Players
• Notebook Computers