LM4911MM National Semiconductor, LM4911MM Datasheet

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LM4911MM

Manufacturer Part Number
LM4911MM
Description
Manufacturer
National Semiconductor
Datasheet

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© 2003 National Semiconductor Corporation
LM4911
Stereo 40mW Low Noise Headphone Amplifier with
Selectable Capacitive Coupled or OCL Output
General Description
The LM4911 is an stereo audio power amplifier capable of
delivering 40mW per channel of continuous average power
into a 16Ω load or 25mW per channel into a 32Ω load at 1%
THD+N from a 3V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4911 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems. In addition, the
LM4911 may be configured for either single-ended capaci-
tively coupled outputs or for OCL outputs (patent pending).
The LM4911 features a low-power consumption shutdown
mode and a power mute mode that allows for faster turn on
time with less than 1mV voltage change at outputs on re-
lease. Additionally, the LM4911 features an internal thermal
shutdown protection mechanism.
The LM4911 is unity gain stable and may be configured with
external gain-setting resistors.
Block Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DS200314
FIGURE 1. Block Diagram
Key Specifications
n PSRR at 217Hz and 1kHz
n Output Power at 1kHz with V
n Output Power at 1kHz with V
n Shutdown Current
n Output Voltage change on release from Shutdown
n Mute Current
Features
n OCL or capacitively coupled outputs (patent pending)
n External gain-setting capability
n Available in space-saving MSOP and LD packages
n Ultra low current shutdown mode
n Mute mode allows fast turn-on (1ms) with less than 1mV
n 2V - 5.5V operation
n Ultra low noise
Applications
n Portable CD players
n PDAs
n Portable electronics devices
a 16Ω load
16Ω load
change on outputs
V
DD
= 2.4V, R
20031478
L
= 16Ω (C-Coupled)
DD
DD
= 2.4V, 1% THD+N into
= 3V, 1% THD+N into a
February 2003
www.national.com
100µA (max)
2.0µA (max)
25mW (typ)
40mW (typ)
1mV (max)
65dB (typ)

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LM4911MM Summary of contents

Page 1

... The LM4911 is unity gain stable and may be configured with external gain-setting resistors. Block Diagram Boomer ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation Key Specifications n PSRR at 217Hz and 1kHz n Output Power at 1kHz with V a 16Ω load n Output Power at 1kHz with V 16Ω ...

Page 2

Typical Application FIGURE 2. Typical Capacitive Coupled Output Configuration Circuit FIGURE 3. Typical OCL Output Configuration Circuit www.national.com 20031480 20031481 2 ...

Page 3

... Connection Diagrams MSOP Package 20031479 Top View Order Number LM4911MM See NS Package Number MUB10A MSOP Marking 200314A9 Top View G-Boomer Family A3 - LM4911MM LD Package Top View Order Number LM4911LD See NS Package Number LDA10A 3 200314C0 www.national.com ...

Page 4

... 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 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V The following specifications apply for V 25˚ ...

Page 5

Electrical Characteristics V The following specifications apply for V 25˚C. Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD I Mute Current M P Output Power O V Output Noise Voltage NO PSRR Power Supply Rejection Ratio ...

Page 6

Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency www.national.com THD+N vs Frequency 20031482 THD+N vs Frequency 20031484 THD+N vs Frequency 20031406 6 20031483 20031485 20031403 ...

Page 7

Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency (Continued) THD+N vs Frequency 20031405 THD+N vs Frequency 20031486 THD+N vs Frequency 20031488 7 20031404 20031487 20031489 www.national.com ...

Page 8

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power www.national.com (Continued) THD+N vs Output Power 20031490 THD+N vs Output Power 20031492 THD+N vs Output Power 20031408 8 20031491 20031493 20031407 ...

Page 9

Typical Performance Characteristics THD+N vs Output Power Output Resistance vs Load Resistance Output Power vs Supply Voltage (Continued) THD+N vs Output Power 20031410 Output Power vs Supply Voltage 20031413 Output Power vs Supply Voltage 20031494 9 20031409 20031412 20031495 www.national.com ...

Page 10

Typical Performance Characteristics Output Power vs Supply Voltage Output Power vs Load Resistance Power Dissipation vs. Output Power www.national.com (Continued) Output Power vs Load Resistance 20031411 Power Dissipation vs. Output Power 20031497 Power Dissipation vs Output Power 20031499 10 20031496 ...

Page 11

Typical Performance Characteristics Channel Separation Channel Separation Channel Separation (Continued) 200314A1 20031417 20031418 11 Channel Separation 200314A2 Channel Separation 20031419 Channel Separation 20031416 www.national.com ...

Page 12

Typical Performance Characteristics Power Supply Rejection Ratio Power Supply Rejection Ratio Power Supply Rejection Ratio www.national.com (Continued) Power Supply Rejection Ratio 200314A3 Power Supply Rejection Ratio 200314A5 Power Supply Rejection Ratio 20031420 12 200314A4 200314A6 20031423 ...

Page 13

Typical Performance Characteristics Power Supply Rejection Ratio Frequency Response vs Input Capacitor Size Open Loop Frequency Response (Continued) Power Supply Rejection Ratio 20031421 Frequency Response vs Input Capacitor Size 20031427 200314A7 13 20031422 20031426 Supply Voltage vs Supply Current 20031424 ...

Page 14

Typical Performance Characteristics Clipping Voltage vs Supply Voltage Shutdown Hysteresis Voltage, Vdd=5V Power Derating Curve www.national.com (Continued) 20031425 Shutdown Hysteresis Voltage, Vdd=3V 200314B1 200314B3 14 Noise Floor 200314A8 200314B2 ...

Page 15

Typical Performance Characteristics LM4911LD Specific Characteristics THD+N vs Frequency 5V 16Ω 100mW, OCL O Power Dissipation vs Output Power 5V 16Ω THD+N ≤ 1%, ...

Page 16

Application Information AMPLIFIER CONFIGURATION EXPLANATION As shown in Figure 1, the LM4911 has three operational amplifiers internally. Two of the amplifier’s have externally configurable gain while the other amplifier is internally fixed at the bias point acting as a unity-gain ...

Page 17

Application Information FIGURE 4. Recommended Circuit for Different Supply Turn-On Timing FIGURE 5. Turn-On, Shutdown, and Mute Timing for Cap-Coupled Mode (Continued) 17 200314B6 200314B5 www.national.com ...

Page 18

... Further detailed and specific information concerning PCB www.national.com layout, fabrication, and mounting an LD (LLP) package is (Continued) available from National Semiconductor’s Package Engineer- ing Group under application note AN1187. POWER SUPPLY BYPASSING As with any amplifier, proper supply bypassing is important for low noise performance and high power supply rejection. ...

Page 19

Application Information period. These periods are shown as X1 and X2 and are discussed in greater detail in the Mute section as well as shown in Figure 5. MUTE When in C-CUPL mode, the LM4911 also features a mute function ...

Page 20

Application Information must be stated as a pair of -3dB frequency points. Five times away from a -3dB point is 0.17dB down from passband response which is better than the required fied 100Hz/5 = 20Hz ...

Page 21

... Physical Dimensions inches (millimeters) unless otherwise noted MSOP Order Number LM4911MM NS Package Number MUB10A LLP Order Number LM4911LD NS Package Number LDA10A 21 www.national.com ...

Page 22

... 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 ...

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