LM49151 - Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Knowledge Base

Features
E 2S class D amplifier
Ground referenced outputs — eliminates output coupling capacitors
I 2C programmable No Clip Function with Clip Control
Voltage limiter speaker protection
I 2C volume and mode Control
Ear Piece Amplifier
Advanced click-and-pop suppression
Low supply current
Micro-power shutdown
20-bump micro SMD package

Key Specification


Output power at VDD = 3.3V THD+N 1%  
  LS Mode, RL = 8Ω 520mW (typ)
  HP Mode, RL = 32Ω 40mW (typ)
Output power at VDD = 5V THD+N 1%  
  LS Mode, RL = 8Ω 1.25W (typ)
  HP Mode, RL = 32Ω 42mW (typ)
Output Offset  
LS Mode 15 6mV (typ)
HP Mode 15 2mV (typ)

General Description


The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. More...


Applications


Mobile Phones
PDAs
Notebook PCs
Portable Electronics Devices
MP3 Players
  Typical Application
click for larger image


ParametersValues
Power@ 8Ohms, 1% THD 1.25 Watt
THD .02 %
PSRR 91 dB
SNR 102 dB
THD Conditions LS;f=1kHz ; Po =250mW
PSRR Conditions HP Mode 4, mono input
SNR Conditions HP Mode 4, Po =40mW
User Supply 5 Volt
Audio Mux Yes
Capless Headphone Yes
ClassD Driver Yes
Stereo Inputs 1
National 3D No
Digital Volume Control Max 18 dB
Digital Volume Control Min -80 dB
Supply Range +1.4 - +3.6 V
Mono Inputs 1
Temperature Min -40 deg C
Temperature Max 85 deg C
Loudspeaker Type Class D
Headphone Type True Ground
Loudspeaker Outputs 1
PowerWise Yes
A/D Channels 0 Channels
D/A Channels 0

  Connection Diagram
click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM49151   PRODUCT BRIEF Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control 167
Kbytes
16-Apr-09 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM49151TLEVALLM49151 Evaluation BoardFull productionN/A
  CALLN/A-
N/AN/A
LM49151TLMICRO SMD20NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$1.60reel
of
250
XYTT
I GL7
12 weeksN/A
LM49151TLXMICRO SMD20NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$1.60reel
of
3000
XYTT
I GL7
12 weeksN/A

General Description


The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49151 combines a 1.25W mono E 2S class D amplifier, 125mW Class AB earpiece driver, 42mW/channel stereo ground referenced headphone drivers, volume control, input mixer/multiplexer, and speaker protection into a single device.

The LM49151 class D speaker amplifier features National’s unique Automatic Level Control (ALC) that provides both a I 2C programmable no-clip feature with Clip Controls and speaker protection. The E 2S (Enhanced Emission Suppression) class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency while delivering 1.25W into an 8Ω load with <1% THD+N with a 5V supply. The 42mW/channel headphone drivers feature National’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost.

The LM49151 features separate volume controls for the loudspeaker and headphone inputs. Mode selection, shutdown control, and volume are controlled through an I 2C compatible interface. The LM49151's superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

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

Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1964: Application Note 1964 LM49151 Demonstration Board and Software Guide 1605
Kbytes
13-May-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]