lm48821tlx National Semiconductor Corporation, lm48821tlx Datasheet

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lm48821tlx

Manufacturer Part Number
lm48821tlx
Description
Direct Coupled, Ultra Low Noise, 52mw Differential Input Stereo Headphone Amplifier With I2c Volume Control
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM48821TLX.pdf (22 pages)
© 2007 National Semiconductor Corporation
LM48821
Direct Coupled, Ultra Low Noise, 52mW Differential Input
Stereo Headphone Amplifier with I2C Volume Control
General Description
With its directly-coupled output technology, the LM48821 is a
variable gain audio power amplifier capable of delivering
52mW
than 1% THD+N from a 3V power supply. The I
control has a range of –76dB to 18dB.
The LM48821's Tru-GND technology utilizes advanced
charge pump technology to generate the LM48821’s negative
supply voltage. This eliminates the need for output-coupling
capacitors typically used with single-ended loads.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM48821 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 LM48821 incorporates selectable low-power consump-
tion shutdown and channel select modes.
The LM48821 contains advanced output transient suppres-
sion circuitry that eliminates noises which would otherwise
occur during turn-on and turn-off transitions.
Boomer® is a registered trademark of National Semiconductor Corporation.
Tru-GND is a trademark of National Semiconductor Corporation.
RMS
per channel into a 16Ω single-ended load with less
201842
2
C volume
Key Specifications
Features
■
■
■
■
■
■
■
■
■
Applications
■
■
■
■
■
■
■ 
■ 
■ 
■ 
R
R
Ground referenced outputs
Differential Inputs
I
Available in space-saving micro SMD package
Ultra low current shutdown mode
Advanced output transient suppression circuitry
eliminates noises during turn-on and turn-off transitions
2.0V to 4.0V operation (PV
1.8 to 4.0V operation (I
No output coupling capacitors, snubber networks,
bootstrap capacitors, or gain-setting resistors required
Notebook PCs
Desktop PCs
Mobile Phones
PDAs
Portable Electronic Devices
MP3 Players
Improved PSRR at 217Hz
Stereo Output Power at V
Mono Output Power at V
Shutdown current
2
L
L
C Volume and mode controls
= 16Ω, THD+N = 1%
= 16Ω, THD+N = 1%
2
CV
DD
DD
DD
DD
= 3V,
= 3V,
)
and SV
DD
)
www.national.com
52mW (typ)
93mW (typ)
0.1μA (typ)
82dB (typ)
June 2007

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lm48821tlx Summary of contents

Page 1

... The LM48821 contains advanced output transient suppres- sion circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. Boomer® registered trademark of National Semiconductor Corporation. Tru-GND is a trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation Key Specifications ■ ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 20184211 ...

Page 3

Connection Diagrams micro SMD Package Top View Order Number TLA1611A See NS Package Number TLA1611A Pin Designator 201842d7 Pin Descriptions Pin Name SV Signal ...

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 ...

Page 5

Symbol Parameter X Crosstalk TALK Z Output Impedance OUT Control Interface Electrical Characteristics The following specifications apply for 1.8V Symbol Parameter t SCL period 1 t SDA Setup Time 2 t SDA Stable Time 3 t Start Condition Time 4 ...

Page 6

Typical Performance Characteristics THD+N vs Frequency 6mW 16Ω, Stereo R L THD+N vs Frequency 16mW 16Ω, Mono Left R L THD+N vs Frequency V ...

Page 7

THD+N vs Frequency 35mW 16Ω, Stereo R L 20184238 THD+N vs Frequency 70mW 16Ω, Mono Left R L 201842b9 THD+N vs Frequency V = ...

Page 8

THD+N vs Frequency 40mW 32Ω, Stereo R L THD+N vs Frequency 60mW 32Ω, Mono Right R L THD+N vs Frequency V = 4V, P ...

Page 9

THD+N vs Output Power = 16Ω 2V 1kHz, Mono Left 20184240 THD+N vs Output Power = 16Ω 2V 1kHz, Stereo 20184242 THD+N vs Output Power = ...

Page 10

THD+N vs Output Power 1kHz, Mono Left THD+N vs Output Power 1kHz, Stereo THD+N vs Output Power ...

Page 11

THD+N vs Output Power = 32Ω 3V 1kHz, Mono Left 20184251 THD+N vs Output Power = 32Ω 3V 1kHz, Stereo 20184253 THD+N vs Output Power = ...

Page 12

CMRR vs Frequency PSRR vs Frequency PSRR vs Frequency www.national.com = 16Ω 201842d9 = 32Ω 20184227 = 32Ω 20184229 12 PSRR vs ...

Page 13

PSRR vs Frequency = 32Ω 4V 20184231 Output Power vs Voltage Supply = 32Ω, Mono R L 20184213 Output Power vs Voltage Supply = 32Ω, Stereo R L 20184217 Output Power vs Voltage Supply = ...

Page 14

Output Power vs Power Dissipation V = 2V, 3V, 4V Output Power vs Power Dissipation V = 2V, 3V, 4V Supply Current vs Supply Voltage Stereo www.national.com = 32Ω, Mono 20184215 = 32Ω, Stereo ...

Page 15

Application Information D7 D6 Chip Address 1 1 Volume Control VD4 FIGURE Timing Diagram FIGURE Bus Format TABLE 1. Chip Address TABLE 2. Control Registers D7 D6 ...

Page 16

VOLUME CONTROL The LM48821 can be configured in 32 different gain steps by forcing I table below: VD4 VD3 ...

Page 17

COMPATIBLE INTERFACE The LM48821 uses a serial data bus that conforms to the I protocol. Controlling the chip’s functions is accomplished with two wires: serial clock (SCL) and serial data (SDA). The clock line is uni-directional. The ...

Page 18

SELECTING EXTERNAL COMPONENTS Optimizing the LM48821’s performance requires properly se- lecting external components. Though the LM48821 operates well when using external components with wide tolerances, best performance is achieved by optimizing component val- ues. Charge Pump Capacitor Selection Use low ...

Page 19

Revision History Rev 1.0 Date 06/06/07 19 Description Initial release. www.national.com ...

Page 20

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 16-Bump micro SMD Order Number LM48821TL NS Package Number TLA1611A X = 1.970± 0. 1.970 ± 0. 0.6 ± 0.075 ...

Page 21

Notes 21 www.national.com ...

Page 22

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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