LM4808LDBD National Semiconductor, LM4808LDBD Datasheet

no-image

LM4808LDBD

Manufacturer Part Number
LM4808LDBD
Description
BOARD EVALUATION LM4808LD
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4808LDBD

Amplifier Type
Class AB
Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
150mW x 2 @ 16 Ohm
Voltage - Supply
2 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4808
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2001 National Semiconductor Corporation
LM4808
Dual 105 mW Headphone Amplifier
General Description
The LM4808 is a dual audio power amplifier capable of
delivering 105mW per channel of continuous average power
into a 16 load with 0.1% (THD+N) from a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components using surface mount packaging. Since
the LM4808 does not require bootstrap capacitors or snub-
ber networks, it is optimally suited for low-power portable
systems.
The unity-gain stable LM4808 can be configured by external
gain-setting resistors.
Typical Application
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
Boomer
®
is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS101276
Key Specifications
n THD+N at 1kHz at 105mW continuous average output
n THD+N at 1kHz at 70mW continuous average output
n Output power at 0.1% THD+N at 1kHz into 32
Features
n LLP, MSOP, and SOP surface mount packaging
n Switch on/off click suppression
n Excellent power supply ripple rejection
n Unity-gain stable
n Minimum external components
Applications
n Headphone Amplifier
n Personal Computers
n Portable electronic devices
power into 16
power into 32
(typ)
10127601
www.national.com
August 2001
0.1% (typ)
0.1% (typ)
70mW

Related parts for LM4808LDBD

LM4808LDBD Summary of contents

Page 1

... Application Information Section for information concerning proper selection of the input and output coupling capacitors. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2001 National Semiconductor Corporation Key Specifications n THD+N at 1kHz at 105mW continuous average output ...

Page 2

Connection Diagrams www.national.com LLP Package Top View Order Number LM4808LD See NS Package Number LDA08B SOP & MSOP Package 10127602 Top View Order Number LM4808M, LM4808MM See NS Package Number M08A, MUA08A 2 10127657 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 4) ESD Susceptibility (Note 5) ESD Susceptibility (Note 6) Junction Temperature Soldering Information (Note 1) Small Outline Package ...

Page 4

Electrical Characteristics The following specifications apply for V Symbol Parameter C Load Capacitance L SR Slew Rate Electrical Characteristics The following specifications apply for V Symbol Parameter I Supply Current DD V Input Offset Voltage OS P Output Power o ...

Page 5

External Components Description Components Functional Description The inverting input resistance, along with pass filter with f = 1/( The input coupling capacitor blocks DC voltage at the amplifier’s input terminals create ...

Page 6

Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency www.national.com (Continued) THD+N vs Frequency 10127607 THD+N vs Frequency 10127609 THD+N vs Frequency 10127611 6 10127608 10127610 10127612 ...

Page 7

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power (Continued) THD+N vs Output Power 10127613 THD+N vs Output Power 10127615 THD+N vs Output Power 10127617 7 10127614 10127616 10127618 www.national.com ...

Page 8

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power Output Power vs Load Resistance www.national.com (Continued) THD+N vs Output Power 10127619 10127621 10127623 8 10127620 Output Power vs Load Resistance 10127622 Output Power vs Load Resistance 10127624 ...

Page 9

Typical Performance Characteristics Output Power vs Supply Voltage Output Power vs Power Supply Power Dissipation vs Output Power (Continued) 10127625 10127627 10127629 9 Output Power vs Power Supply 10127626 Clipping Voltage vs Supply Voltage 10127628 Power Dissipation vs Output Power ...

Page 10

Typical Performance Characteristics Power Dissipation vs Output Power Channel Separation Power Supply Rejection Ratio www.national.com (Continued) 10127631 10127633 10127635 10 Channel Separation 10127632 Noise Floor 10127634 Open Loop Frequency Response 10127650 ...

Page 11

Typical Performance Characteristics Open Loop Frequency Response Supply Current vs Supply Voltage Frequency Response vs Output Capacitor Size (Continued) 10127651 10127644 10127646 11 Open Loop Frequency Response 10127638 Frequency Response vs Output Capacitor Size 10127645 Frequency Response vs Output Capacitor ...

Page 12

Typical Performance Characteristics Typical Application Frequency Response www.national.com (Continued) Frequency Response 10127648 12 Typical Application 10127649 ...

Page 13

... Further detailed and specific information concerning PCB layout, fabrication, and mounting an LD (LLP) package is available from National Semiconductor’s Package Engineer- ing Group under application note AN1187. POWER DISSIPATION Power dissipation is a major concern when using any power amplifier and must be thoroughly understood to ensure a successful design ...

Page 14

Application Information Also, careful consideration must be taken in selecting a certain type of capacitor to be used in the system. Different types of capacitors (tantalum, electrolytic, ceramic) have unique performance characteristics and may affect overall system performance. Bypass Capacitor ...

Page 15

Demonstration Board Layout Recommended SO PC Board Layout: Top Silkscreen Recommended SOP PC Board Layout: Top Layer Recommended SOP PC Board Layout: Bottom Layer 10127639 Recommended LD PC Board Layout: 10127640 Recommended LD PC Board Layout: 10127642 Recommended LD PC ...

Page 16

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) Order Number LM4808LD NS Package Number LDA08B Order Number LM4808M NS Package Number M08A 16 ...

Page 17

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

Related keywords