Datasheet Texas Instruments LM49155 — Datenblatt

LM49155
www.ti.com SNAS492 – JULY 2010 LM49155
PRODUCT BRIEF Uplink Noise Suppression & Downlink
SNR Enhancement Analog Audio Subsystem
Check for Samples: LM49155 FEATURES 1 2 Noise cancellation for uplink and downlink
without DSP-type artifacts, distortions or
delays
Adapting AGC on ambient noise level &
downlink signal strength for earpiece
Downlink adjustable noise-reducing high pass
filter E2S Class D Amplifier with ALC
Ground Referenced Headphone Outputs with
Advanced Click Pop Suppression
Micro-power shutdown APPLICATIONS Mobile Phones
Portable Electronic Devices DESCRIPTION
The LM49155 is a fully integrated audio subsystem designed for portable handheld applications such as cellular
phones. The LM49155 combines a Noise Suppression microphone amplifier, a 1.35W mono class D amplifier
with ALC, class AB earpiece driver with AGC, a high efficiency, stereo, ground referenced headphone amplifier
with click pop suppression and I2C modes select and volume control.
The LM49155 features analog fully differential input, and differential output microphone amplifier designed to
reduce background acoustic noise, while delivering superb speech clarity in voice communication applications.
Downlink SNR enhancement with an advanced acoustic AGC technology to adjust output levels.
The LM49155 speaker amplifier features National’s unique output limiter that provides both a no-clip feature and …