LM49100 - Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Design Tools	Knowledge Base

Features

•	Mono and stereo inputs
•	Thermal Overload Protection
•	True-ground Headphone Drivers
•	I 2C Control Interface
•	Input mute attenuation
•	2nd Stage headphone attenuator
•	32-step digital volume control
•	10 Operating Modes
•	Minimum external components
•	Click and Pop suppression
•	Micro-power shutdown
•	Available in space-saving 3mm x 3mm 25 bump GR package
•	RF Suppression

Key Specification

■ Power Output at V_DD = 5V: Loudspeaker (LS): R_L = 8Ω, THD+N ≤ 1%	1.275W
Headphone (V_DDHP = 2.8V): R_L = 32Ω, THD+N ≤ 1%	50mW
■ Shutdown current	0.01µA

General Description

The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a 5V power supply. More...

Applications

•	Mobile Phones
•	PDAs
•	Laptops
•	Portable Electronics

Typical Application

*click for larger image

Parametric Table expand

Parametric Table collapse

Power@ 8Ohms, 10% THD 0.525 Watt

Power@ 8Ohms, 1% THD 0.425 Watt

THD 0.2 %

PSRR 90 dB

Channels 3 Channels

THD Conditions Headphone mode 4, f=1kHz, RL=32ohm, Pout=25mW

THD Conditions Headphone mode 4, f=1kHz, RL=32ohm, Pout=25mW

PSRR Conditions LS, Modes 1, 2, 10

PSRR Conditions LS, Modes 1, 2, 10

Power@ 8Ohms, 10% THD 0.525 Watt

Power@ 8Ohms, 1% THD 0.425 Watt

THD 0.2 %

PSRR 90 dB

Channels 3 Channels

THD Conditions Headphone mode 4, f=1kHz, RL=32ohm, Pout=25mW

PSRR Conditions LS, Modes 1, 2, 10

User Supply 3.6 Volt

Capless Headphone No

ClassD Driver No

Interface I2C

Stereo Inputs 2

Digital Volume Control Max 18 dB

Digital Volume Control Min -54 dB

Output Modes 10

Supply Range +2.7 - +5.5 V

Mono Inputs 2

Temperature Min -40 deg C

Temperature Max 85 deg C

Loudspeaker Type Class AB

Headphone Type True Ground

Loudspeaker Outputs 2

View Using Catalog

Typical Performance

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Additional Resources

Design Tools (see below)

Connection Diagram

*click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM49100 Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier	2132 Kbytes	26-Sep-07	Download

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

Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM49100GREVAL

Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier

Preliminary

N/A

$400.00

N/A

LM49100GR

MICRO-ARRAY

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$3.35

reel
of
1000

XYTT
GC9

6 weeks

1000

General Description

The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a 5V power supply. The LM49100 also has a stereo true-ground headphone amplifier capable of 50mW per channel of continuous average power into a 32Ω single-ended (SE) loads with 1% THD+N.

The LM49100 has three input channels. One pair of SE inputs can be used with a stereo signal. The other input channel is fully differential and may be used with a mono input signal. The LM49100 features a 32-step digital volume control and ten distinct output modes. The mixer, volume control, and device mode select are controlled through an I 2C compatible interface.

Thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

Design Tools

Title	Size in Kbytes	Date
Control Software			View	Download

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

Application Notes

Title	Size in Kbytes	Date
AN-1622: Application Note 1622 LM49100 Evaluation Board User's Guide	1237 Kbytes	19-Oct-07	Download

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

[Information as of 4-Jul-2009]