lm49150tlx National Semiconductor Corporation, lm49150tlx Datasheet

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lm49150tlx

Manufacturer Part Number
lm49150tlx
Description
Mono Class D Audio Subsystem With Earpiece Driver And Stereo Ground Referenced Headphone Amplifiers
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM49150TLX.pdf (28 pages)
© 2008 National Semiconductor Corporation
LM49150
Mono Class D Audio Subsystem with Earpiece Driver and
Stereo Ground Referenced Headphone Amplifiers
General Description
The LM49150 is a fully integrated audio subsystem designed
for portable handheld applications such as cellular phones.
Part of National's Power Wise® product family, the LM49150
consumes very low power in the various modes of operation
and still providing great audio performance. The LM49150
combines a 1.25W mono E
sion) class D amplifier, 135mW Class AB earpiece amplifier,
42mW/channel stereo ground reference headphone ampli-
fiers, volume control, and mixing circuitry into a single device.
The filterless class D amplifier delivers 1.25W into an 8Ω load
with <1% THD+N with a 5V supply. The E
features a patented, ultra low EMI PWM architecture that sig-
nificantly reduces RF emissions while preserving audio qual-
ity. The 42mW/channel headphone drivers feature National’s
ground referenced architecture that creates a ground-refer-
enced output from a single supply, eliminating the need for
bulky and expensive DC-blocking capacitors, saving space
and minimizing cost.
The LM49150 features a fully differential mono input, and two
single-ended stereo inputs. The three inputs can be mixed/
multiplexed to either the speaker or headphone amplifiers.
Each input channel has an independent, 32-step digital vol-
ume control. The headphone output stage features an addi-
tional, 8-step gain control, while the speaker output stage has
a selectable 6dB or 12dB gain. The mixer, volume control and
device mode select are controlled through an I
serial interface.
The LM49150’s superior click and pop suppression elimi-
nates audible transients on power-up/down and during shut-
down. The LM49150 is available in a ultra-small 20-bump
micro SMD package (2.225mm X 2.644mm).
Boomer® is a registered trademark of National Semiconductor Corporation.
2
S (Enhanced Emission Suppres-
300446
2
S class D amplifier
2
C compatible
Key Specifications
Features
■
■
■
■
■
■
■
■
■
■
■
Applications
■
■
■
■ 
 
  
 
  
 
  
■ 
 
  
 
  
 
  
■ 
■ 
■ 
Speaker:
Headphone:
Earpiece:
Speaker:
Headphone:
Earpiece:
E
Ground referenced headphone outputs — eliminates
output coupling capacitors
I
Mono earpiece amplifier
Flexible output for speaker and headphone output
20–bump micro SMD package
Soft enable function
“Click and Pop” suppression circuitry
Thermal shutdown protection
Low supply current
Micro-power shutdown
Mobile Phones
PDAs
Portable Electronics
R
R
R
R
R
R
Output power at V
Output power at V
Output Offset
Single Supply Operation (V
I
2
2
2
C volume and mode control
L
L
L
L
L
L
C Single Supply Operation
LS Mode
HP Mode
Earpiece
S class D amplifier
= 8Ω BTL, THD+N
= 32Ω SE, THD+N
= 8Ω SE, THD+N
= 8Ω BTL, THD+N
= 32Ω BTL, THD+N
= 8Ω SE, THD+N
DD
DD
≤
≤
= 5V:
= 3.3V:
≤
≤
≤
1%
1%
≤
1%
1%
1%
1%
DD
)
September 10, 2008
www.national.com
135mW (typ)
520mW (typ)
1.25W (typ)
42mW (typ)
42mW (typ)
35mW (typ)
2.7 to 5.5V
1.7 to 5.5V
9mV (typ)
1mV (typ)
1mV (typ)

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lm49150tlx Summary of contents

Page 1

... The LM49150’s superior click and pop suppression elimi- nates audible transients on power-up/down and during shut- down. The LM49150 is available in a ultra-small 20-bump micro SMD package (2.225mm X 2.644mm). Boomer® registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation Key Specifications ■  ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit-Output Capacitor-less www.national.com 2 300446n9 ...

Page 3

... Connection Diagrams 20 Bump micro SMD Package Top View (Bump Side Down) (See NS Package Number TLA20KGA) Order Number Package LM49150TL 20 Bump micro SMD LM49150TLX 20 Bump micro SMD Top Markings XY - Date Code TT - Die Traceability K7 - LM49150TL 300446n8 Ordering Information Package DWG # Transport Media TLA20KGA ...

Page 4

Bump Descriptions Bump Name GND A3 LSOUT- A4 LSOUT SDA B3 SCL B4 LSV C1 INL C2 INR C3 BYPASS C4 CPV D1 INM O(LDO) D3 CPN D4 CPP E1 ...

Page 5

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 Rating (Note 4) ESD Rating (Note ...

Page 6

Symbol Parameter ∈ Output Noise OUT PSRR Power Supply Rejection Ratio Volume Control Step Size Error Digital Volume Control Range A Mute Attenuation M Mono Channel Input Impedance L and R Input Impedance Bypass Resistance ...

Page 7

Electrical Characteristics 5.0V The following specifications apply for V = 8Ω 1kHz, unless otherwise specified. Limits apply for T Symbol Parameter I Supply Current DD I Shutdown Current SD V Output Offset Voltage OS P Output Power O ...

Page 8

Symbol Parameter PSRR Power Supply Rejection Ratio Volume Control Step Size Error Digital Volume Control Range A Mute Attenuation M Mono Channel Input Impedance L and R Input Impedance Bypass Resistance CMRR Common-Mode Rejection Ratio ...

Page 9

micro (Note 2) The following specifications apply for V Symbol Parameter Clock Period Data Setup Time Data Stable Time Start Condition ...

Page 10

Typical Performance Characteristics THD+N vs Frequency = 8Ω 3.3V Speaker Mode 1 THD+N vs Frequency = 8Ω 5V Speaker Mode 1 THD+N vs Frequency = 8Ω ...

Page 11

THD+N vs Frequency = 8Ω 3.3V 20mW DD L OUT Earpiece Bypass Mode 300446o4 THD+N vs Frequency = 8Ω 5V 60mW DD L OUT Earpiece Bypass Mode 300446o6 THD+N vs ...

Page 12

THD+N vs Output Power = 32Ω 1kHz Headphone Mode 8 CMRR vs Frequency V = 3.3V Loudspeaker Mode 1 CMRR vs Frequency V = 3.3V ...

Page 13

PSRR vs Frequency = 8Ω 3.3V 200mV R DD RIPPLE P-P L Loudspeaker Mode 1 300446t0 PSRR vs Frequency = 32Ω 3.3V 200V R DD RIPPLE P-P L Headphone Mode 4 300446r3 ...

Page 14

Efficiency vs Output Power = 8Ω 1kHz V = 3.6V Speaker Mode 1 Power Dissipation vs Output Power = 8Ω 1kHz R L Speaker Mode 1 Power Dissipation vs Output Power = 8Ω, ...

Page 15

Output Power vs Supply Voltage = 32Ω 1kHz R L Headphone Mode 8 300446q6 Supply Current vs Supply Voltage Headphone Mode 1, No Load 300446q8 Output Power vs Supply Voltage = 8Ω 1kHz R L Earpiece ...

Page 16

Application Information COMPATIBLE INTERFACE The LM49150 is controlled through an I interface that consists of a serial data line (SDA) and a serial clock (SCL). The clock line is uni-directional. The data line is bi-directional (open drain). ...

Page 17

B7 B6 Chip 1 1 Address B7 B6 Shutdown Control 0 0 Spread Spectrum Output Mode Control 0 1 Bypass Output Gain Control 1 0 Mono Input Volume 1 0 Control Left Input Volume 1 1 Control Right Input Volume ...

Page 18

Output Mode MC3 MC2 Number ...

Page 19

TABLE 6. Output Gain Control (Loudspeaker) Bit LS_GAIN TABLE 7. Headphone Output Gain Setting HP_Gain2 HP_Gain1 Value Gain (dB HP_Gain0 0 1 ...

Page 20

Volume Step (1) xG4 ...

Page 21

The left and right stereo inputs of the LM49150 are configured for single-ended sources (see Figure 1). INPUT CAPACITOR SELECTION Input capacitors may be required for some applications, or when the audio source is single-ended. Input capacitors block the DC ...

Page 22

LM49150 Demoboard Bill Of Materials Location Qty CIN2, CIN1 2 0.22uF, 1206, 10V, X7R Ceramic Capacitor CS4, CS2 2 0.1uF, 0805, 10V, X7R Ceramic Capacitor CS7 1 1.0uF, 0805, 10V, X7R Ceramic Capacitor CIN3, CIN4 2 1.0uF 1206, 10V, X7R ...

Page 23

Demo Board Schematic 23 www.national.com ...

Page 24

PC Board Layout Top Silkscreen Layer Layer 2 www.national.com 300446s8 300446s5 24 300446s7 Top Layer 300446s6 Layer 3 ...

Page 25

Bottom Layer 25 300446s4 Bottom Silkscreen www.national.com ...

Page 26

Revision History Rev 1.0 08/27/08 1.01 09/09/08 www.national.com Date Initial release. Edited Table 6. 26 Description ...

Page 27

Physical Dimensions inches (millimeters) unless otherwise noted 20 – Bump micro SMD Package Order Number LM49150TL NS Package Number TLA20KGA = 2225μ 2644μm, = 600μ www.national.com ...

Page 28

... 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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