LM49155TLX/NOPB National Semiconductor, LM49155TLX/NOPB Datasheet

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LM49155TLX/NOPB

Manufacturer Part Number
LM49155TLX/NOPB
Description
IC AUDIO SUBSYSTEM 36SMD
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class D, Class ABr
Datasheet
1.LM49155TLNOPB.pdf (6 pages)

Specifications of LM49155TLX/NOPB

Output Type
Headphones, 2-Channel (Stereo)
Features
Depop, Differential Inputs, E²S, I²C, Shutdown, Volume Control
Mounting Type
Surface Mount
Package / Case
36-UFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Max Output Power X Channels @ Load
-
© 2010 National Semiconductor Corporation
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 I
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 E
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
Simplified Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
2
C modes select and volume control.
2
S class D amplifier features a patented, ul-
301081
PRODUCT BRIEF
LM49155
Key Specifications
Features
■
■
■
■
■
■
Applications
■
■
■ 
■ 
■ 
■ 
Electrical FFNS
Downlink SNRI
P
P
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
E
Ground Referenced Headphone Outputs with Advanced
Click Pop Suppression
Micro-power shutdown
Mobile Phones
Portable Electronic Devices
Near-Field SNR Enhancement
Uplink Far Field Noise Suppression
Downlink SNR Enhancement Earpiece Amplifier
Class D Loudspeaker Amplifier R
Headphone Amplifier R
OUT
OUT
2
S Class D Amplifier with ALC
, THD+N
, THD+N
≤
≤
E
E
%, V
%, HPV
at f = 1kHz
DD
L
= 5.0V
DD
= 32Ω
= 1.8V
30108109
L
PRELIMINARY
= 15μH+8Ω+15μH
6 to 18dB (typ)
www.national.com
July 21, 2010
1.35W (typ)
19mW (typ)
34dB (typ)
16dB (typ)

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LM49155TLX/NOPB Summary of contents

Page 1

... 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 Simplified Block Diagram Boomer® registered trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation LM49155 PRODUCT BRIEF Key Specifications ■ ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Application Circuit 2 30108108 ...

Page 3

Connection Diagrams TL Package (3.434mm x 3.459mm x 0.6mm) Top View (Bump Side Down) Order Number LM49155TL See NS Package Number TLA36STA Order Number Package LM49155TL 36 Bump microSMD LM49155TLX 36 Bump microSMD 36 Bump micro SMD Marking 30108107 Ordering ...

Page 4

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted micro SMD–36 Package Order Number LM49155TL NS Package Number TLA36STA 4 ...

Page 5

Notes 5 www.national.com ...

Page 6

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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