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

LM4857

Stereo 1.2W Audio Sub-system with 3D Enhancement

Overview

Diagrams

Parametrics

Documents

Order

Packaging

Tools

Reliability

Obsolete Versions

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

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.

Key Specification
P_OUT, Stereo Loudspeakers, 4, 5V, 1% THD+N (LM4857SP) 1.6W (typ)

P_OUT, Stereo Loudspeakers, 8, 5V, 1% THD+N 1.2W (typ)

P_OUT, Stereo Headphones, 32, 5V, 1% THD+N 75mW (typ)

P_OUT, Mono Earpiece, 32, 5V, 1% THD+N 100mW (typ)

P_OUT, Stereo Loudspeakers, 8, 3.3V, 1% THD+N 495mW (typ)

P_OUT, Stereo Headphones, 32, 3.3V, 1% THD+N 33mW (typ)

P_OUT, Mono Earpiece, 32, 3.3V, 1% THD+N 43mW (typ)

Shutdown Current 0.06µA (typ)

Applications

• Cell Phones

• PDAs

• Portable Gaming Devices

• Internet Appliances

• Portable DVD/CD/AAC/MP3 players

MY BRIEFCASE

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Typical Application click for larger image

Connection Diagram click for larger image

Typical Performance click for larger image

Parameters Values

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

Datasheets
Title Size Date Other
Language

LM4857 Boomer ® Audio Power Amplifier Series Stereo 1.2W Audio Sub-system with 3D Enhancement 1814
Kbytes 8-Jun-05

Part Number(s)
(NSID)

Top View

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LM4857ITL/NOPB

RoHS Status

MICRO SMD

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	496
RS COMPONENTS		Worldwide	248

$2.00 each at 1K+ pcs

reel
of
250

LM4857SP/NOPB
LM4857SP

RoHS Status

LLP

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	1900

$2.15 each at 1K+ pcs

reel
of
1000

Obsolete Versions

Obsolete Part Alternate Part or Supplier Source Last Time Buy Date

LM4857GRBD
LM4857ITLBD
NATIONAL SEMICONDUCTOR
16 Nov 2008

LM4857SPX
LM4857ITLX
NATIONAL SEMICONDUCTOR
16 Nov 2008

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4857ITL/NOPB		MICRO SMD	30	1	260	Detail	Download	N/A	XVG I C2
LM4857SP/NOPB LM4857SP		LLP	28	1 1	260 260	Detail	Download	N/A	NS UZXYTT L4857SP

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

CAD Symbols and Models
Download LM4857 CAD Symbols

Models
N/A

Reliability Metrics

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

LM4857ITL CS065 2 38968 52 0 4402000 1 1249079519

LM4857SP CS065 2 38968 52 0 4402000 1 1249079519

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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

[Information as of 9-Feb-2010]