LM4857GR

Manufacturer Part NumberLM4857GR
DescriptionIC AUDIO SUBSYSTEM W/3D 49UBGA
ManufacturerNational Semiconductor
SeriesBoomer®
TypeClass AB
LM4857GR datasheet
 


Specifications of LM4857GR

Output Type2-Channel (Stereo) with Mono and Stereo HeadphonesMax Output Power X Channels @ Load1.6W x 2 @ 4 Ohm; 75mW x 2 @ 32 Ohm
Voltage - Supply2.7 V ~ 5.5 VFeatures3D, Depop, I²C, Mute, Shutdown, Thermal Protection, Volume Control
Mounting TypeSurface MountPackage / Case49-Micro-array
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantOther namesLM4857GRTR
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LM4857
Stereo 1.2W Audio Sub-system with 3D Enhancement
General Description
The LM4857 is an integrated audio sub-system designed for
stereo cell phone applications. Operating on a 3.3V supply, it
combines a stereo speaker amplifier delivering 495mW per
channel into an 8Ω load, a stereo headphone amplifier de-
livering 33mW per channel into a 32Ω load, a mono earpiece
amplifier delivering 43mW into a 32Ω load, and a line output
for an external powered handsfree speaker. It integrates the
audio amplifiers, volume control, mixer, power management
control, and National 3D enhancement all into a single pack-
age. In addition, the LM4857 routes and mixes the stereo
and mono inputs into 16 distinct output modes. The LM4857
2
is controlled through an I
C compatible interface. Other fea-
tures include an ultra-low current shutdown mode and ther-
mal shutdown protection.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
The LM4857 is available in a 30-bump ITL package and a
28–lead LLP package.
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
Key Specifications
j
P
, Stereo Loudspeakers, 4Ω, 5V,
OUT
1% THD+N (LM4857SP)
j
P
, Stereo Loudspeakers, 8Ω, 5V,
OUT
1% THD+N
j
P
, Stereo Headphones, 32Ω, 5V,
OUT
1% THD+N
j
P
, Mono Earpiece, 32Ω, 5V,
OUT
1% THD+N
j
P
, Stereo Loudspeakers, 8Ω, 3.3V,
OUT
1% THD+N
j
P
, Stereo Headphones, 32Ω, 3.3V,
OUT
1% THD+N
j
P
, Mono Earpiece, 32Ω, 3.3V,
OUT
1% THD+N
j
Shutdown Current
Features
n Stereo speaker amplifier
n Stereo headphone amplifier
n Mono earpiece amplifier
n Mono Line Output for external handsfree carkit
n Independent Left, Right, and Mono volume controls
n National 3D enhancement
2
n I
C compatible interface
n Ultra low shutdown current
n Click and Pop Suppression circuit
n 16 distinct output modes
n Thermal Shutdown Protection
n Available in micro SMD and LLP packages
Applications
n Cell Phones
n PDAs
n Portable Gaming Devices
n Internet Appliances
n Portable DVD/CD/AAC/MP3 players
DS200797
December 2004
1.6W (typ)
1.2W (typ)
75mW (typ)
100mW (typ)
495mW (typ)
33mW (typ)
43mW (typ)
0.06µA (typ)
www.national.com

LM4857GR Summary of contents

  • Page 1

    ... Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components. The LM4857 is available in a 30-bump ITL package and a 28–lead LLP package. Boomer ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation Key Specifications Stereo Loudspeakers, 4Ω, 5V, OUT ...

  • Page 2

    Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 20079708 ...

  • Page 3

    Connection Diagrams 30 Bump ITL Package Top View (Bump-side down) Order Number LM4857ITL See NS Package Number TLA30CZA Pin Connection (ITL) Pin ...

  • Page 4

    ... GND Ground NC No Connect LLS+ Left Loudspeaker Positive Output VDD Power Supply EP- Mono Earpiece Negative Output EP+ Mono Earpiece Positive Output NC No Connect 4 micro Array Marking 200797I3 Top View X — Date Code T — Die Traceability G — Boomer Family C2 — LM4857GR Pin Description ...

  • Page 5

    Pin Connection (GR) (Continued Connection Diagram GND Ground LLS+ Left Loudspeaker Positive Output LHP Left Headphone Output NC No Connect L Left Stereo Input ...

  • Page 6

    Pin Connection (SP) Pin www.national.com Name RHP Right Headphone Output V Power ...

  • Page 7

    ... 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 Temperature ( Thermal Resistance Audio Amplifier Electrical Characteristics V ...

  • Page 8

    Audio Amplifier Electrical Characteristics V The following specifications apply for V Symbol Parameter N Output Noise OUT PSRR Power Supply Rejection Ratio Xtalk Crosstalk T Wake-up Time WU Audio Amplifier Electrical Characteristics V The following specifications apply for V Symbol ...

  • Page 9

    Audio Amplifier Electrical Characteristics V The following specifications apply for V Symbol Parameter P Output Power O Total Harmonic Distortion Plus THD+N Noise V Offset Voltage OS N Output Noise OUT PSRR Power Supply Rejection Ratio = 3. ...

  • Page 10

    Audio Amplifier Electrical Characteristics V The following specifications apply for V Symbol Parameter Xtalk Crosstalk T Wake-up Time WU Volume Control Electrical Characteristics The following specifications apply for V Symbol Parameter Stereo Volume Control Range Mono Volume Control Range Volume ...

  • Page 11

    ... JA Note 11: “0dB gain” refers to the volume control gain setting of M Note 12: The given θ is for an LM4857SP mounted on a PCB with a 2in JA Note 13: The given θ is for an LM4857GR mounted on a PCB with a 4in JA (Notes 1, 2) (Continued and 2.5V ≤ and V DD ...

  • Page 12

    External Components Description Components 1. C This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the IN amplifier’s input terminals. C Impedance This is the supply bypass capacitor. ...

  • Page 13

    Typical Performance Characteristics LM4857SP THD+N vs Output Power V = 5V; LLS, RLS 1kHz 4Ω; Mode 7; 0dB Gain L THD+N vs Frequency V = 5V; LLS, RLS 400mW ...

  • Page 14

    Typical Performance Characteristics THD+N vs Frequency V = 5V; LHP, RHP 32Ω; Mode 9; 0dB Gain L THD+N vs Frequency V = 5V; EP 15mW 32Ω; Mode 1; 0dB Gain, ...

  • Page 15

    Typical Performance Characteristics THD+N vs Frequency V = 5V; LINEOUT 5kΩ; Mode 5; 0dB Gain L THD+N vs Frequency V = 5V; LINEOUT 5kΩ; Mode 10; 0dB Gain L (Note ...

  • Page 16

    Typical Performance Characteristics THD+N vs Output Power V = 5V; LLS, RLS 1kHz 8Ω; Mode 7; 0dB Gain L THD+N vs Output Power V = 5V; LHP, RHP 1kHz 32Ω; ...

  • Page 17

    Typical Performance Characteristics THD+N vs Output Power V = 5V; EP 1kHz Mode 1; 0dB Gain; Top-CD4 = 1; Bot-CD4 = 0 PSRR vs Frequency V = 5V; LLS, RLS 8Ω; 0db Gain; DD ...

  • Page 18

    Typical Performance Characteristics PSRR vs Frequency V = 5V; LHP, RHP 32Ω; 0db Gain All audio inputs terminated Top-Mode 13, 14; Mid-Mode 3, 4; Bot-Mode 8, 9 PSRR vs Frequency V = 5V; EP ...

  • Page 19

    Typical Performance Characteristics PSRR vs Frequency V = 5V; LINEOUT 5kΩ; 0db Gain All audio inputs terminated Top-Mode 15; Mid-Mode 10; Bot-Mode 5 Crosstalk vs Frequency V = 5V; LLS, RLS 400mW ...

  • Page 20

    Typical Performance Characteristics Crosstalk vs Frequency V = 5V; LHP, RHP 15mW Mode 9; 0db Gain; 3D off Top-Left to Right; Bot- Right to Left Frequency vs Response LLS, RLS 8Ω; L Mode ...

  • Page 21

    Typical Performance Characteristics Frequency vs Response LHP, RHP 32Ω Mode 4; Full Gain Frequency vs Response EP 32Ω; Mode 1; Full Gain L Top-CD4 = 1; Bot-CD4 = 0 (Note 11) (Continued) 20079740 ...

  • Page 22

    Typical Performance Characteristics Frequency vs Response LINEOUT 5kΩ Mode 10; Full Gain Power Dissipation vs Output Power = 32Ω; THD+N ≤ 1% LHP, RHP Top-V = 5V; Bot-V DD per channel www.national.com (Note 11) ...

  • Page 23

    Typical Performance Characteristics Output Power vs Load Resistance LLS, RLS 8Ω; L Top-V = 5V, 10% THD+N; Topmid-V DD Botmid-V = 3V, 10% THD+N; Bot-V DD Output Power vs Load Resistance EP 32Ω; CD4 = 0 ...

  • Page 24

    Typical Performance Characteristics Output Power vs Supply Voltage LLS, RLS 8Ω; L Top–10% THD+N; Bot–1% THD+N Output Power vs Supply Voltage EP 32Ω; L Top–10% THD+N; CD4 = 1; Topmid–1% THD+N, CD4 = 1 Botmid–10% THD+N; ...

  • Page 25

    Application Information A7 A6 Chip Address 1 1 ADR = ADR = externally configured by ADR pin Mono Volume control Left Volume control Right Volume control Mode control 2 FIGURE 2. I ...

  • Page 26

    Application Information MD4 MD3 ...

  • Page 27

    Application Information LD4//RD4 LD3//RD3 ...

  • Page 28

    Application Information Mode CD3 CD2 CD1 CD0 Line Out MUTE MUTE MUTE MUTE 5 0 ...

  • Page 29

    Application Information CD4 COMPATIBLE INTERFACE The LM4857 uses a serial bus, which conforms to the I protocol, to control the chip’s functions with two wires: clock (SCL) and data (SDA). The clock line is uni-directional. The data ...

  • Page 30

    Application Information Best thermal performance is achieved with the largest prac- tical copper heat sink area. If the heatsink and amplifier share the same PCB layer, a nominal 2in for 5V operation with a 4Ω load. Heatsink areas not placed ...

  • Page 31

    Application Information The maximum power dissipation point given by Equation (9) must not exceed the power dissipation given by Equation (10 θ P ’ DMAX JMAX A The LM4857’ 150˚C. In the ...

  • Page 32

    Application Information depends on desired PSRR requirements, click and pop per- formance, wake-up time, system cost, and size constraints. www.national.com (Continued) FIGURE 4. Reference Design Board Schematic 32 20079709 ...

  • Page 33

    Demonstration Board ITL PCB Layout Recommended ITL PCB Layout: Top Silkscreen Recommended ITL PCB Layout: Inner Layer 1 20079707 Recommended ITL PCB Layout: 20079704 Recommended ITL PCB Layout: 33 20079706 Top Layer 20079705 Inner Layer 2 www.national.com ...

  • Page 34

    Demonstration Board ITL PCB Layout www.national.com (Continued) 20079703 Recommended ITL PCB Layout: Bottom Layer 34 ...

  • Page 35

    Demonstration Board GR PCB Layout Recommended GR PCB Layout: Top Silkscreen Recommended GR PCB Layout: Inner Layer 1 20079767 Recommended GR PCB Layout: 20079765 Recommended GR PCB Layout: 35 20079768 Top Layer 20079766 Inner Layer 2 www.national.com ...

  • Page 36

    Demonstration Board GR PCB Layout www.national.com (Continued) 20079764 Recommended GR PCB Layout: Bottom Layer 36 ...

  • Page 37

    Demonstration Board SP PCB Layout Recommended SP PCB Layout: Top Over Layer Recommended SP PCB Layout: Mid Layer 200797I9 Recommended SP PCB Layout: 200797I7 Recommended SP PCB Layout: Bottom Layer 37 200797I8 Top Layer 200797I6 www.national.com ...

  • Page 38

    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 30-Bump micro SMD Order Number LM4857ITL NS Package Number TLA30CZA ± ± 2.543 0. 2.949 0. ± = 0.6 0.075 3 ...

  • Page 39

    Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 28 — Lead SP Package Order Number LM4857SP NS Package Number SPA28A 39 www.national.com ...

  • Page 40

    ... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 49 Bump GR Package Order Number LM4857GR NS Package Number GRA49A 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 ...