TI1 LM49155TLX Uplink noise suppression & downlink snr enhancement analog audio subsystem Datasheet

LM49155
LM49155 PRODUCT BRIEF
Uplink Noise Suppression & Downlink SNR
Enhancement Analog Audio Subsystem
Literature Number: SNAS492
July 21, 2010
Uplink Noise Suppression & Downlink SNR Enhancement
Analog Audio Subsystem
General Description
Key Specifications
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 speaker
protection. The E2S class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF
emissions while preserving audio quality and efficiency. The
headphone drivers feature National’s ground referenced architecture 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
■ 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 DSPtype 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
30108109
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation
301081
www.national.com
LM49155 Product Brief
PRELIMINARY
LM49155
PRODUCT BRIEF
LM49155
Typical Application
30108108
FIGURE 1. Typical Application Circuit
www.national.com
2
LM49155
Connection Diagrams
TL Package
(3.434mm x 3.459mm x 0.6mm)
36 Bump micro SMD Marking
30108112
Top View
XX — Date Code
YY — Die Traceability
G — Boomer
N7 — LM49155TL
30108107
Top View (Bump Side Down)
Order Number LM49155TL
See NS Package Number TLA36STA
Ordering Information
Order Number
Package
Package DWG #
Transport Media
MSL Level
Green Status
LM49155TL
36 Bump microSMD
LM49155TLX
36 Bump microSMD
TLA36STA
250 units on tape and reel
1
NOPB
TLA36STA
3000 units on tape and reel
1
NOPB
3
www.national.com
LM49155
Physical Dimensions inches (millimeters) unless otherwise noted
micro SMD–36 Package
Order Number LM49155TL
NS Package Number TLA36STA
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4
LM49155
Notes
5
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LM49155 Product Brief
Notes
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