LM4920TL National Semiconductor, LM4920TL Datasheet

LM4920TL

Manufacturer Part Number

LM4920TL

Description

Manufacturer

National Semiconductor

Datasheet

1.LM4920TL.pdf (17 pages)

Specifications of LM4920TL

Operational Class

Class-AB

Audio Amplifier Output Configuration

2-Channel Stereo

Output Power (typ)

0.08x2@16OhmW

Audio Amplifier Function

Headphone

Total Harmonic Distortion

0.04@16Ohm@60mW%

Single Supply Voltage (typ)

Dual Supply Voltage (typ)

Not RequiredV

Power Supply Requirement

Single

Rail/rail I/o Type

Power Supply Rejection Ratio

70dB

Single Supply Voltage (min)

1.6V

Single Supply Voltage (max)

4.2V

Dual Supply Voltage (min)

Not RequiredV

Dual Supply Voltage (max)

Not RequiredV

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Lead Free Status / Rohs Status

Not Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Allchip Electronic(HK) Limited

Part Number:

LM4920TLX

Manufacturer:

Quantity:

18 954

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LM4920

Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW

Stereo Headphone Amplifier

General Description

The LM4920 is a ground referenced, fixed-gain audio power

amplifier capable of delivering 80mW of continuous average

power into a 16Ω single-ended load with less than 1%

THD+N from a 3V power supply.

The LM4920 features a new circuit technology that utilizes a

charge pump to generate a negative reference voltage. This

allows the outputs to be biased about ground, thereby elimi-

nating output-coupling capacitors typically used with normal

single-ended loads.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4920 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 LM4920 features a low-power consumption shutdown

mode selectable for either channel separately. This is ac-

complished by driving either the SD_RC (Shutdown Right

Channel) or SD_LC (Shutdown Left Channel) (or both) pins

with logic low, depending on which channel is desired shut-

down. Additionally, the LM4920 features an internal thermal

shutdown protection mechanism.

The LM4920 contains advanced pop & click circuitry that

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4920 has an internal fixed gain of 1.5V/V.

Boomer

is a registered trademark of National Semiconductor Corporation.

DS201793

Key Specifications

Features

n Fixed Logic Levels

n Ground referenced outputs

n High PSRR

n Available in space-saving micro SMD package

n Ultra low current shutdown mode

n Improved pop & click circuitry eliminates noises during

n No output coupling capacitors, snubber networks,

n Shutdown either channel independently

Applications

n Mobile Phones

n MP3 Players

n PDAs

n Portable electronic devices

n Notebook PCs

turn-on and turn-off transitions

bootstrap capacitors, or gain-setting resistors required

Improved PSRR at 217Hz

Power Output at V

Shutdown Current

Internal Fixed Gain

Operating Voltage

= 16Ω, THD % 1%

= 3V,

October 2006

www.national.com

1.6V to 4.2V

0.01µA (typ)

1.5V/V (typ)

80mW (typ)

70dB (typ)

Related parts for LM4920TL

LM4920TL Summary of contents

Page 1

... The LM4920 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4920 has an internal fixed gain of 1.5V/V. Boomer ® registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation Key Specifications j Improved PSRR at 217Hz j ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 201793B8 ...

Page 3

... Right Channel Input Negative Terminal - Charge Pump Flying Capacitor Positive Power Supply - Amplifier DD Left Channel Output Negative Power Supply - Amplifier DD Charge Pump Power Output 3 14 – Bump TL Marking 20179378 Top View XY – Date Code TT – Lot Traceability G – Boomer Family H4 – LM4920TL 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) Electrical Characteristics V The following specifications apply for V ...

Page 5

Electrical Characteristics V The following specifications apply for V Symbol Parameter Z Output Impedance OUT I Input Leakage L Note 1: All voltages are measured with respect to the GND pin unless otherwise specified. Note 2: Absolute Maximum Ratings indicate ...

Page 6

Typical Performance Characteristics THD+N vs Frequency V = 1.6V 16Ω THD+N vs Frequency V = 1.8V 16Ω THD+N vs Frequency 16Ω www.national.com ...

Page 7

Typical Performance Characteristics THD+N vs Frequency V = 3.6V 16Ω THD+N vs Frequency V = 4.2V 16Ω THD+N vs Output Power V = 1.6V 16Ω, f ...

Page 8

Typical Performance Characteristics THD+N vs Output Power V = 1.6V 16Ω 1kHz DD L Two channels in phase THD+N vs Output Power V = 1.8V 16Ω 1kHz DD L One channel enabled ...

Page 9

Typical Performance Characteristics THD+N vs Output Power V = 3.0V 16Ω 1kHz DD L One channel enabled THD+N vs Output Power V = 3.0V 16Ω 1kHz DD L Two channels in phase ...

Page 10

Typical Performance Characteristics THD+N vs Output Power V = 3.6V 16Ω 1kHz DD L Two channels in phase THD+N vs Output Power V = 4.2V 16Ω 1kHz DD L One channel enabled ...

Page 11

Typical Performance Characteristics PSRR vs Frequency V = 1.6V 16Ω PSRR vs Frequency 16Ω PSRR vs Frequency V = 4.2V 16Ω (Continued) PSRR vs Frequency ...

Page 12

Typical Performance Characteristics Output Power vs Supply Voltage R = 16Ω, one channel L Output Power vs Supply Voltage R = 16Ω, 2 channels in phase L Supply Current vs Supply Voltage R = 16Ω L www.national.com (Continued) Output Power ...

Page 13

Application Information SUPPLY VOLTAGE SEQUENCING good general practice to first apply the supply voltage to a CMOS device before any other signal or supply on other pins. This is also true for the LM4920 audio amplifier which ...

Page 14

Application Information SD_LC/SD_RC pins and V . Connect the switch between DD the SD_LC/SD_RC pins and ground. Select normal amplifier operation by opening the switch. Closing the switch con- nects the SD_LC/SD_RC pins to ground, activating micro- power shutdown. The ...

Page 15

Application Information LM4920 micro SMD DEMO BOARD ARTWORK Top Layer Mid Layer 2 (Continued) 20179305 20179307 15 Mid Layer 1 20179306 Bottom Layer 20179308 www.national.com ...

Page 16

Revision History Rev 1.0 1.1 www.national.com Date 03/27/06 10/18/06 16 Description Initial release. Text edits. ...

Page 17

... Email: new.feedback@nsc.com Tel: 1-800-272-9959 Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 14 – Bump micro SMD Order Number LM4920TL NS Package Number TLE1411A ± ± 0.03mm 1.970 0.03mm 0.600 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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