LM4949TLEVAL National Semiconductor, LM4949TLEVAL Datasheet

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LM4949TLEVAL

Manufacturer Part Number
LM4949TLEVAL
Description
BOARD EVALUATION LM4949TL
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheets
1.LM4949TLNOPB.pdf (42 pages)
2.LM4949TLEVAL.pdf (12 pages)

Specifications of LM4949TLEVAL

Amplifier Type
Class D
Output Type
2-Channel (Stereo) with Stereo Headphones
Max Output Power X Channels @ Load
2.5W x 2 @ 4 Ohm; 190mW x 2 @ 16 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4949
Lead Free Status / RoHS Status
Not applicable / Not applicable
© 2007 National Semiconductor Corporation
LM4949
Stereo Class D Audio Subsystem with OCL Headphone
Amplifier
General Description
The LM4949 is a fully integrated audio subsystem designed
for stereo cell phone applications. The LM4949 combines a
2.5W stereo Class D amplifier plus a separate 190mW stereo
headphone amplifier, volume control, and input mixer into a
single device. The filterless class D amplifiers deliver 1.19W/
channel into an 8Ω load with <1% THD+N from a 5V supply.
The headphone amplifier features National’s Output Capaci-
tor-less (OCL) architecture that eliminates the output coupling
capacitors required by traditional headphone amplifiers. Ad-
ditionally, the headphone amplifiers can be configured with
capacitively coupled (CC)loads, or used to drive an external
headphone amplifier. When configured for an external ampli-
fier, the V
shutdown input.
For improved noise immunity, the LM4949 features fully dif-
ferential left, right and mono inputs. The three inputs can be
mixed/multiplexed to either the speaker or headphone ampli-
fiers. The left and right inputs can be used as separate single-
ended inputs, mixing multiple stereo audio sources. The
mixer, volume control, and device mode select are controlled
through an I
Output short circuit and thermal shutdown protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible transients
on power-up/down and during shutdown.
Boomer® is a registered trademark of National Semiconductor Corporation.
DD
2
/2 output (VOC) controls the external amplifier’s
C compatible interface.
 
202001
Key Specifications
Features
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Applications
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into 8Ω
@ 3.6V
Speaker:
Headphone:
Output Short Circuit Protection
Thermal Shutdown
Stereo filterless Class D operation
Selectable OCL/CC Headphone Drivers
RF Suppression
I
32-step digital volume control
Independent Speaker and Headphone Gain Settings
Minimum external components
Click and Pop suppression
Micro-power shutdown
Available in space-saving 25 bump µSMD package
Mobile phones
PDAs
Laptops
Efficiency V
Efficiency V
Quiescent Power Supply Current
Power Output at V
Shutdown Current
2
C Control Interface
R
R
R
R
R
L
L
L
L
L
= 4Ω, THD+N
= 8Ω, THD+N
= 4Ω, THD+N
= 16Ω, THD+N
= 32Ω, THD+N
DD
DD
= 3.6V, 400mW
= 5V, 1W into 8Ω
DD
≤
≤
≤
≤
≤
1%
1%
10%
= 5V
1%
1%
www.national.com
January 2007
9.36mA
153mW
1.19W
89mW
86.5%
87.4%
0.1μA
2.5W
2W

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LM4949TLEVAL Summary of contents

Page 1

... Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Su- perior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Boomer® registered 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 202001c6 ...

Page 3

Connection Diagrams TL Package 2.68mm x 2.68mm x 0.6mm Top View Order Number LM4949TL See NS Package Number TLA25JJA LM4949TL Marking 202001c0 Top View XY — 2 digit datecode TT — Die traceability 3 202001c7 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 (Note 1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V = 15μH + 8Ω + 15μ 32Ω ...

Page 5

Symbol Parameter THD+N Total Harmonic Distortion + Noise THD+N Total Harmonic Distortion + Noise e Noise N η Efficiency Xtalk Crosstalk T Turn on Time ON T Turn off Time OFF Z Input Impedance IN Conditions Differential Mode ...

Page 6

Symbol Parameter A Gain V Mute Mute Attenuation CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio PSRR Power Supply Rejection Ratio PSRR Power Supply Rejection Ratio www.national.com Conditions Volume Control Minimum Gain Maximum Gain LS Second Gain Stage ...

Page 7

Electrical Characteristics V = 15μH + 8Ω + 15μ 32Ω 1kHz unless otherwise specified. Limits apply for T (SP) L(HP) Symbol Parameter I Supply Current DD I Shutdown Supply Current SD V Output Offset Voltage OS ...

Page 8

Symbol Parameter THD+N Total Harmonic Distortion + Noise e Noise N η Efficiency Xtalk Crosstalk T Turn on Time ON T Turn off Time OFF Z Input Impedance IN www.national.com Conditions Single-Ended Input Mode 1kHz = 16Ω, P ...

Page 9

Symbol Parameter A Gain V Mute Mute Attenuation CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio PSRR Power Supply Rejection Ratio PSRR Power Supply Rejection Ratio Conditions Volume Control Minimum Gain Maximum Gain LS Second Gain Stage Step ...

Page 10

Electrical Characteristics V = 15μH + 8Ω + 15μ 32Ω 1kHz unless otherwise specified. Limits apply for T (SP) L(HP) Symbol Parameter I Supply Current DD I Shutdown Supply Current SD V Output Offset Voltage OS ...

Page 11

Symbol Parameter THD + N Total Harmonic Distortion + Noise e Noise N η Efficiency Xtalk Crosstalk T ON Turn on Time T Turn off Time OFF Z Input Impedance IN Conditions Single-Ended Input Mode 1kHz = 16Ω, ...

Page 12

Symbol Parameter A Gain V Mute Mute Attenuation CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio PSRR Power Supply Rejection Ratio PSRR Power Supply Rejection Ratio www.national.com Conditions Volume Control Minimum Gain Maximum Gain LS Second Gain Stage ...

Page 13

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 occur. Operating Ratings indicate conditions for which the device is functional, ...

Page 14

BUMP NAME DESCRIPTION A1 LLS- Left Channel Loudspeaker Inverting Output A2 LLS+ Left Channel Loudspeaker Non-inverting Output A3 SDA Serial Data Input A4 HPGND Headphone Ground A5 HPR Right Channel Headphone Output B1 VDDLS Speaker Power Supply B2 ADR Address ...

Page 15

Typical Performance Characteristics THD+N vs Frequency Speaker Mode, Differential Input V = 3.0V 300mW OUT THD+N vs Frequency Speaker Mode, Differential Input V = 5.0V 1W OUT THD+N vs Frequency Speaker Mode, ...

Page 16

THD+N vs Frequency Speaker Mode, Single-Ended Input V = 3.0V 300mW OUT THD+N vs Frequency Speaker Mode, Single-Ended Input V = 5.0V 1W OUT THD+N vs Frequency Speaker Mode, Single-Ended Input V ...

Page 17

THD+N vs Frequency OCL Headphone Mode, Differential Input = 16Ω 3.0V 35mW OUT L 202001g2 THD+N vs Frequency OCL Headphone Mode, Differential Input = 16Ω 5.0V 100mW OUT ...

Page 18

THD+N vs Frequency OCL Headphone Mode, Single-Ended Input V = 3.0V 35mW OUT THD+N vs Frequency OCL Headphone Mode, Single-Ended Input V = 5.0V 100mW OUT THD+N vs Frequency OCL Headphone Mode, ...

Page 19

THD+N vs Frequency CC Headphone Mode, Differential Input = 16Ω 3.0V 35mW OUT L 202001h4 THD+N vs Frequency CC Headphone Mode, Differential Input = 16Ω 5.0V 100mW OUT ...

Page 20

THD+N vs Frequency CC Headphone Mode, Single-Ended Input V = 3.0V 35mW OUT THD+N vs Frequency CC Headphone Mode, Single-Ended Input V = 5.0V 100mW OUT THD+N vs Frequency CC Headphone Mode, ...

Page 21

THD+N vs Output Power Speaker Mode, Differential Input = 4Ω 1kHz A = 6dB 202001d0 THD+N vs Output Power Speaker Mode, Single-Ended Input = 4Ω 1kHz A = 6dB 202001d2 ...

Page 22

THD+N vs Output Power OCL Headphone Mode, Single-Ended Input = 16Ω 1kHz A = 0dB THD+N vs Output Power CC Headphone Mode, Differential Input = 16Ω 1kHz A = 0dB ...

Page 23

PSRR vs Frequency Speaker Mode, Differential Input V = 3.6V 200mV , R DD RIPPLE P-P L PSRR vs Frequency Speaker Mode, Single-Ended Input Stereo and Mono Inputs Active V = 3.6V 200mV , R DD ...

Page 24

PSRR vs Frequency CC Headphone Mode, Differential Input V = 3.6V 200mV DD RIPPLE PSRR vs Frequency CC Headphone Mode, Single-Ended Input Stereo and Mono Inputs Active V = 3.6V 200mV DD RIPPLE Efficiency vs Output ...

Page 25

Power Dissipation vs Output Power Speaker Mode = 8Ω 1kHz R L 20200140 Power Dissipation vs Output Power OCL Headphone Mode = 32Ω 1kHz R L 20200169 Power Dissipation vs Output Power CC Headphone Mode = ...

Page 26

Output Power vs Supply Voltage Speaker Mode = 8Ω 1kHz R L Output Power vs Supply Voltage OCL Headphone Mode = 32Ω 1kHz R L Output Power vs Supply Voltage CC Headphone Mode = 32Ω, f ...

Page 27

CMRR vs Frequency OCL Headphone Mode = 32Ω 3.6V P-P L 202001j9 Output Noise vs Frequency Speaker Mode, Single-Ended Input Stereo and Mono Inputs Active = 8Ω 3.6V, R ...

Page 28

Crosstalk vs Frequency OCL Headphone Mode V = 3.6V RIPPLE Supply Current vs Supply Voltage Speaker Mode, No Load Supply Current vs Supply Voltage CC Headphone Mode, No Load www.national.com = 32Ω P-P L ...

Page 29

Supply Current vs Supply Voltage Shutdown Mode, No Load 202001b9 Turn-Off OCL Headphone Mode 20200114 Turn-Off CC Headphone Mode 20200116 Turn-On OCL Headphone Mode Turn-On CC Headphone Mode 29 20200113 20200115 www.national.com ...

Page 30

Application Information I2C COMPATIBLE INTERFACE The LM4949 is controlled through an I interface that consists of two wires; clock (SCL) and data (SDA). The clock line is uni-directional. The data line is bi- directional (open-collector) although the LM4949 does not ...

Page 31

REGISTE REGISTE NAME Shutdown 0 Control Stereo 0.1 Input Mode 0 0 Control Speaker Output Mux Control Headphon e Output Mux Control Output On/ 3 Off ...

Page 32

GENERAL AMPLIFIER FUNCTION Class D Amplifier The LM4949 features a high-efficiency, filterless, Class D stereo amplifier. The LM4949 Class D amplifiers feature a fil- terless modulation scheme, the differential outputs of each channel switch at 300khz, from ...

Page 33

FIGURE 5. Driving an External Headphone Amplifier 33 202001c8 www.national.com ...

Page 34

Single-Ended Input The left and right stereo inputs of the LM4949 can be config- ured for single-ended sources (Figure 6). In single-ended input mode, the LM4949 can accept different single- ended audio sources. Set bits L1_INSEL = ...

Page 35

Input Mixer / Multiplexer The LM4949 includes a comprehensive mixer/multiplexer controlled through the I2C interface. The mixer/multiplexer allows any input combination to appear on any output of the LM4949. Control bits LSR_SSEL and LSL_SSEL (loudspeak- ers), and HPR_SSEL and HPL_SSEL ...

Page 36

HPR_ON (D3) con- trols the right channel headphone output, HPL_ON (D2) con- trols the left channel headphone output, LSR_ON (D1) controls the right channel loudspeaker output, and LRL_ON (D0) controls the left channel loudspeaker output. ...

Page 37

Volume Step MG4/LG4/RG4 MG3/LG3/RG3 ...

Page 38

Differential Audio Amplifier Configuration As logic supply voltages continue to shrink, system designers increasingly turn to differential signal handling to preserve signal to noise ratio with decreasing voltage swing. The LM4949 can be configured as a fully differential amplifier, amplifying ...

Page 39

Revision History Rev Date 1.0 09/06/06 1.1 09/27/06 1.2 01/17/07 Description Initial release. Fixed some of the Typical Performance Curves. Added the X1, X2, and X3 numerical values of theTLA25JJA mktg outline (back page). 39 www.national.com ...

Page 40

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted micro SMD Package Order Number LM4949TL NS Package Number TLA25JJA X1 = 2.722 2.722 0.600 40 ...

Page 41

Notes 41 www.national.com ...

Page 42

... 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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