lm4894itlx National Semiconductor Corporation, lm4894itlx Datasheet

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lm4894itlx

Manufacturer Part Number
lm4894itlx
Description
1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
Manufacturer
National Semiconductor Corporation
Datasheet

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LM4894ITLX
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© 2003 National Semiconductor Corporation
LM4894
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General Description
The LM4894 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 1 watt of continuous average
power to an 8Ω BTL load with less than 1% distortion
(THD+N) from a 5V
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4894 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4894 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
select pin to be driven in a likewise manner to enable Shut-
down. Additionally, the LM4894 features an internal thermal
shutdown protection mechanism.
The LM4894 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4894 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
Connection Diagrams
Boomer
j
Improved PSRR at 217Hz
®
is a registered trademark of National Semiconductor Corporation.
Mini Small Outline (MSOP) Package
See NS Package Number MUB10A
Order Number LM4894MM
DC
power supply.
Top View
DS200137
20013723
80dB(typ)
Features
n Fully differential amplification
n Available in space-saving packages micro SMD, MSOP,
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry eliminates noises during
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
n Unity-gain stable
n External gain configuration capability
n Shutdown high or low selectivity
n High CMRR
Applications
n Mobile phones
n PDAs
n Portable electronic devices
j
j
j
and LLP
turn-on and turn-off transitions
bootstrap capacitors required
Power Output at 5.0V & 1% THD
Power Output at 3.3V & 1% THD
Shutdown Current
See NS Package Number LDA10B
Order Number LM4894LD
LLP Package
Top View
20013735
www.national.com
400mW(typ)
0.1µA(typ)
June 2003
1.0W(typ)

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lm4894itlx Summary of contents

Page 1

... Improved PSRR at 217Hz j Connection Diagrams Mini Small Outline (MSOP) Package Top View Order Number LM4894MM See NS Package Number MUB10A Boomer is a registered trademark of National Semiconductor Corporation. ® © 2003 National Semiconductor Corporation Power Output at 5.0V & 1% THD j Power Output at 3.3V & 1% THD j Shutdown Current ...

Page 2

... Bump micro SMD Package Top View Order Number LM4894IBP See NS Package Number BPA09CDB Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com (Continued) Order Number LM4894ITL, LM4894ITLX 20013736 See NS Package Number TLA09AAA 2 9 Bump micro SMD Package 20013794 Top View 20013701 ...

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 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction ...

Page 4

Electrical Characteristics V The following specifications apply for V 25˚C. (Continued) Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may ...

Page 5

Typical Performance Characteristics LD Specific Characteristics LM4894LD THD+N vs Output Power V = 5V, 4Ω LM4894LD Power Dissipation vs Output Power THD+N vs Frequency V = 5V, 4Ω 20013790 Power Derating Curve 20013792 5 LM4894LD ...

Page 6

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Frequency 5V, 8Ω and PWR = 400mW DD L THD+N vs Frequency 3V, 4Ω and PWR = 225mW DD L THD+N vs ...

Page 7

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Output Power @ V = 3V, 8Ω THD+N vs Output Power @ V = 2.6V, 8Ω Power Supply Rejection Ratio (PSRR) Input 10Ω Terminated (Continued) L 20013743 L ...

Page 8

Typical Performance Characteristics Non-LD Specific Characteristics Power Supply Rejection Ratio (PSRR) Input 10Ω Terminated Output Power vs Supply Voltage Power Dissipation vs Output Power www.national.com (Continued Power Supply Rejection Ratio (PSRR) DD 20013749 20013751 Power Dissipation ...

Page 9

Typical Performance Characteristics Non-LD Specific Characteristics Power Dissipation vs Output Power Supply Current vs Shutdown Voltage Shutdown Low Clipping (Dropout) Voltage vs Supply Voltage (Continued) 20013755 Supply Current vs Shutdown Voltage 20013769 Open Loop Frequency Response 20013774 9 Output Power ...

Page 10

Typical Performance Characteristics Non-LD Specific Characteristics Power Derating Curve Input CMRR vs Frequency www.national.com (Continued) 20013776 20013778 10 Noise Floor 20013777 Input CMRR vs Frequency 20013779 ...

Page 11

Typical Performance Characteristics Non-LD Specific Characteristics PSRR vs DC Common-Mode Voltage THD vs Common-Mode Voltage Application Information DIFFERENTIAL AMPLIFIER EXPLANATION The LM4894 is a fully differential audio amplifier that fea- tures differential input and output stages. Internally this is accomplished ...

Page 12

Application Information other. Bridged mode operation is different from the single- ended amplifier configuration that connects the load be- tween the amplifier output and ground. A bridged amplifier design has distinct advantages over the single-ended con- figuration: it provides differential ...

Page 13

Application Information mum power dissipation point obtained from Equation 3 must not be greater than the power dissipation results from Equa- tion )/θ DMAX JMAX A The LM4894’s θ MUA10A package is ...

Page 14

Application Information Tolerance 20% 0.8R 1.2R -0.500V 10% 0.9R 1.1R -0.250V 5% 0.95R 1.05R -0.125V 1% 0.99R 1.01R -0.025V Similar results would occur if the input resistors ...

Page 15

Application Information FIGURE 2. Single-Ended Input, "Shutdown-Low" Configuration FIGURE 3. Single-Ended Input, "Shutdown-High" Configuration (Continued) 15 20013787 20013785 www.national.com ...

Page 16

Physical Dimensions X1 = 1.336 www.national.com inches (millimeters) unless otherwise noted 9-Bump micro SMD Order Number LM4894IBP NS Package Number BPA09CDB ± ± 0. 1.361 0. 0.850 16 ± 0.10 ...

Page 17

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4894LD NSPackage Number LDA10B 17 www.national.com ...

Page 18

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Mini Small Outline (MSOP) Order Number LM4894MM NSPackage Number MUB10A 18 ...

Page 19

... 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) 9-Bump micro SMD Order Number LM4894ITL, LM4894ITLX NS Package Number TLA09AAA ± ...

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