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PDF LM49155 Data sheet ( Hoja de datos )
| Número de pieza | LM49155 | |
| Descripción | Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
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DataSheet.in
LM49155
PRODUCT BRIEF
PRELIMINARY
July 21, 2010
Uplink Noise Suppression & Downlink SNR Enhancement
Analog Audio Subsystem
General 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 dif-
ferential 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 speaker
protection. The E2S class D amplifier features a patented, ul-
tra low EMI PWM architecture that significantly reduces RF
emissions while preserving audio quality and efficiency. The
headphone drivers feature National’s ground referenced ar-
chitecture that creates a ground-referenced output from a
single, low-voltage supply.
The LM49155 is available in an ultra-small 36-bump micro
SMD package (3.434mm x 3.459mm x 0.6mm).
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html
Key Specifications
■ Uplink Far Field Noise Suppression
Electrical FFNSE at f = 1kHz
34dB (typ)
■ Downlink SNR Enhancement Earpiece Amplifier
Near-Field SNR Enhancement
Downlink SNRIE
6 to 18dB (typ)
16dB (typ)
■ Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH
POUT, THD+N ≤ %, VDD = 5.0V
1.35W (typ)
■ Headphone Amplifier RL = 32Ω
POUT, THD+N ≤ %, HPVDD = 1.8V
19mW (typ)
Features
■ 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
Simplified Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation 301081
30108109
www.national.com
1 page  
DataSheet.in
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