LM4857 - Stereo 1.2W Audio Sub-system with 3D Enhancement

Datasheet Packaging Samples & Pricing Reliability Knowledge Base

Features
Stereo speaker amplifier
Stereo headphone amplifier
Mono earpiece amplifier
Mono Line Output for external handsfree carkit
Independent Left, Right, and Mono volume controls
National 3D enhancement
I2C compatible interface
Ultra low shutdown current
Click and Pop Suppression circuit
16 distinct output modes
Thermal Shutdown Protection
Available in micro SMD and LLP packages

Key Specification


POUT, Stereo Loudspeakers, 4, 5V, 1% THD+N (LM4857SP)1.6W (typ)
POUT, Stereo Loudspeakers, 8, 5V, 1% THD+N1.2W (typ)
POUT, Stereo Headphones, 32, 5V, 1% THD+N75mW (typ)
POUT, Mono Earpiece, 32, 5V, 1% THD+N100mW (typ)
POUT, Stereo Loudspeakers, 8, 3.3V, 1% THD+N495mW (typ)
POUT, Stereo Headphones, 32, 3.3V, 1% THD+N33mW (typ)
POUT, Mono Earpiece, 32, 3.3V, 1% THD+N43mW (typ)
Shutdown Current0.06µA (typ)

General Description


The LM4857 is an integrated audio sub-system designed for stereo cell phone applications. More...


Applications


Cell Phones
PDAs
Portable Gaming Devices
Internet Appliances
Portable DVD/CD/AAC/MP3 players
  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Power@ 4Ohms, 10% THD Undefined Watt
Power@ 4Ohms, 1% THD Undefined Watt
Power@ 8Ohms, 10% THD 1.5 Watt
Power@ 8Ohms, 1% THD 1.2 Watt
THD 0.05 %
PSRR 70 dB
SNR Undefined dB
Channels 6 Channels
THD Conditions Speaker; Po=400mW, 8Ohm BTL
THD Conditions Speaker; Po=400mW, 8Ohm BTL
PSRR Conditions Speaker; Mode 2,3,7,8; Audio inputs terminated
PSRR Conditions Speaker; Mode 2,3,7,8; Audio inputs terminated
Power@ 4Ohms, 10% THD Undefined Watt
Power@ 4Ohms, 1% THD Undefined Watt
Power@ 8Ohms, 10% THD 1.5 Watt
Power@ 8Ohms, 1% THD 1.2 Watt
THD 0.05 %
PSRR 70 dB
SNR Undefined dB
Channels 6 Channels
THD Conditions Speaker; Po=400mW, 8Ohm BTL
PSRR Conditions Speaker; Mode 2,3,7,8; Audio inputs terminated
User Supply 5 Volt
Audio Mux Yes
Capless Headphone No
ClassD Driver No
Interface I2C
Stereo Inputs 1
National 3D Yes
Digital Volume Control Max 6 dB
Digital Volume Control Min -40.5 dB
Output Modes 16
Supply Range +2.7 - +5.5 V
Mono Inputs 1
Temperature Min -40 deg C
Temperature Max 85 deg C
Loudspeaker Type Class AB
Headphone Type Cap Coupled
Loudspeaker Outputs 2
View Using Catalog


Typical Performance


click for larger image


  Connection Diagram
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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM4857 Boomer ® Audio Power Amplifier Series Stereo 1.2W Audio Sub-system with 3D Enhancement 1814 Kbytes 8-Jun-05 Download

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


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
LM4857SPLLP28NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$2.15reel
of
1000
NS
UZXYTT
L4857SP
6 weeks2000
LM4857SPXLLP28RoHS Download ObsoleteN/A
 
Buy Now
1K+$2.15reel
of
4500
NS
UZXYTT
L4857SP
16 weeksN/A
LM4857ITLMICRO SMD30NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$2.00reel
of
250
XVG
I C2
6 weeksN/A
LM4857ITLXMICRO SMD30NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$2.00reel
of
3000
XVG
I C2
6 weeks7500

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM4857GRBD
LM4857ITLBD
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM4857SPX
LM4857ITLX
NATIONAL SEMICONDUCTOR
16 Nov 2008

General Description


The LM4857 is an integrated audio sub-system designed for stereo cell phone applications. Operating on a 3.3V supply, it combines a stereo speaker amplifier delivering 495mW per channel into an 8 load, a stereo headphone amplifier delivering 33mW per channel into a 32 load, a mono earpiece amplifier delivering 43mW into a 32 load, and a line output for an external powered handsfree speaker. It integrates the audio amplifiers, volume control, mixer, power management control, and National 3D enhancement all into a single package. In addition, the LM4857 routes and mixes the stereo and mono inputs into 16 distinct output modes. The LM4857 is controlled through an I2C compatible interface. Other features include an ultra-low current shutdown mode and thermal shutdown protection.

Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components.

The LM4857 is available in a 30-bump ITL package and a 28-lead LLP package.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM4857ITLCS065234108590386200011095853045
LM4857ITLXCS065234108590386200011095853045
LM4857SPCS065234108590386200011095853045
LM4857SPXCS065234108590386200011095853045

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 3-Jul-2009]