lm4908mm National Semiconductor Corporation, lm4908mm Datasheet

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lm4908mm

Manufacturer Part Number
lm4908mm
Description
10kv Esd Rated, Dual 120 Mw Headphone Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet
© 2004 National Semiconductor Corporation
LM4908
10kV ESD Rated, Dual 120 mW Headphone Amplifier
General Description
The LM4908 is a dual audio power amplifier capable of
delivering 120mW per channel of continuous average power
into a 16Ω 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 LM4908 does not require bootstrap capacitors or snub-
ber networks, it is optimally suited for low-power portable
systems.
The unity-gain stable LM4908 can be configured by external
gain-setting resistors.
Key Specifications
Typical Application
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
Boomer
j
continuous average output power
into 16Ω
j
continuous average output power
into 32Ω
THD+N at 1kHz at 120mW
THD+N at 1kHz at 75mW
®
is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS200752
0.1% (typ)
0.1% (typ)
Features
n Up to 10kV ESD protection on all pins
n MSOP, SOP, and LLP 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
j
at 1kHz into 32Ω
Output power at 0.1% THD+N
20075201
February 2004
www.national.com
75mW (typ)

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lm4908mm Summary of contents

Page 1

... Typical Application *Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer is a registered trademark of National Semiconductor Corporation. ® © 2004 National Semiconductor Corporation Output power at 0.1% THD 1kHz into 32Ω ...

Page 2

... Connection Diagrams www.national.com SOP (MA) and MSOP (MM) Package 20075202 Top View Order Number LM4908MA, LM4908MM See NS Package Number M08A, MUA08A LLP (LQ) Package Top View Order Number LM4908LQ See NS Package Number LQB08A 2 200752A2 ...

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 ...

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/(2πR c The input coupling capacitor blocks DC voltage at the amplifier’s input terminals create a ...

Page 6

Typical Performance Characteristics THD+N vs Frequency V = 2.6V, PWR = 15mW THD+N vs Frequency V = 3.3V, PWR = 25mW THD+N vs Frequency V = 5V, PWR = 50mW www.national.com (Continued) = 32Ω ...

Page 7

Typical Performance Characteristics THD+N vs Frequency V = 5V, PWR = 50mW THD+N vs Output Power V = 2.6V 8Ω 1kHz DD L THD+N vs Output Power V = 2.6V 32Ω, f ...

Page 8

Typical Performance Characteristics THD+N vs Output Power V = 3.3V 16Ω 1kHz DD L THD+N vs Output Power 8Ω 1kHz DD L THD+N vs Output Power V = 5V, ...

Page 9

Typical Performance Characteristics Output Power vs Load Resistance V = 3.3V 1kHz DD Output Power vs Supply Voltage R = 8Ω 1kHz L Output Power vs Supply Voltage R = 32Ω 1kHz L (Continued) ...

Page 10

Typical Performance Characteristics Power Dissipation vs Output Power Power Dissipation vs Output Power Crosstalk vs Frequency 32Ω www.national.com (Continued) Power Dissipation vs 20075229 Crosstalk vs Frequency 20075231 Output Noise vs Frequency 20075294 10 ...

Page 11

Typical Performance Characteristics PSRR vs Frequency 32Ω RIPPLE Pins 3 and 5 directly driven, Inputs Floating Open Loop Frequency Response 8Ω Open Loop Frequency Response ...

Page 12

Typical Performance Characteristics Frequency Response vs Output Capacitor Size Frequency Response vs Output Capacitor Size Typical Application Frequency Response www.national.com (Continued) Frequency Response vs Output Capacitor Size 20075245 Typical Application Frequency Response 20075247 20075249 12 20075246 20075248 ...

Page 13

Application Information EXPOSED-DAP PACKAGE PCB MOUNTING CONSIDERATION The LM4908’s exposed-dap (die attach paddle) package (LQ) provides a low thermal resistance between the die and the PCB to which the part is mounted and soldered. This allows rapid heat transfer from ...

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 MSOP Board Layout: Top Overlay Recommended MSOP Board Layout: Top Layer Recommended MSOP Board Layout: Bottom Layer 15 20075264 20075265 20075266 www.national.com ...

Page 16

Demonstration Board Layout www.national.com (Continued) Recommended LQ Board Layout: Top Overlay Recommended LQ Board Layout: Top Layer Recommended LQ Board Layout: Bottom Layer 16 200752B1 200752B0 200752A9 ...

Page 17

Demonstration Board Layout (Continued) Recommended MA Board Layout: Top Overlay Recommended MA Board Layout: Top Layer Recommended MA Board Layout: Bottom Layer 17 200752B4 200752B3 200752B2 www.national.com ...

Page 18

LM4908 MDC MWC Dual 120MW Headphone Amplifier Fabrication Attributes Physical Die Identification Die Step Physical Attributes Wafer Diameter Dise Size (Drawn) Thickness Min Pitch Special Assembly Requirements: Note: Actual die size is rounded to the nearest micron. (Referenced to die ...

Page 19

LM4908 MDC MWC Dual 120MW Headphone Amplifier IN U.S.A Tel #: Fax: IN EUROPE Tel: Fax: IN ASIA PACIFIC Tel: IN JAPAN Tel: (Continued) 1 877 Dial Die 1 877 342 5343 1 207 541 6140 49 (0) 8141 351492 ...

Page 20

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) Order Number LM4908LQ NS Package Number LQB08A Order Number LM4908MA NS Package Number M08A 20 ...

Page 21

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) Order Number LM4908MM NS Package Number MUA08A 2 ...

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