LM4856LQBD

Manufacturer Part NumberLM4856LQBD
DescriptionBOARD EVALUATION LM4856LQ
ManufacturerNational Semiconductor
SeriesBoomer®
LM4856LQBD datasheets
 


Specifications of LM4856LQBD

Amplifier TypeClass ABOutput Type1-Channel (Mono) with Stereo Headphones
Max Output Power X Channels @ Load1.5W x 1 @ 4 Ohm; 60mW x 2 @ 32 OhmVoltage - Supply2.6 V ~ 5 V
Operating Temperature-40°C ~ 85°CBoard TypeFully Populated
Utilized Ic / PartLM4856Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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LM4856
Integrated Audio Amplifier System
General Description
The LM4856 is an audio power amplifier system capable of
delivering 1.1W (typ) of continuous average power into a
mono 8Ω bridged-tied load (BTL) with 1% THD+N and
60mW (typ) per channel of continuous average power into
stereo 32Ω single-ended (SE) loads with 0.5% THD+N, us-
ing a 5V power supply.
The LM4856 features a 32 step digital volume control and
eight distinct output modes. The digital volume control and
output modes are programmed through a two-wire I
patible control interface, that allows flexibility in routing and
mixing audio channels.
The LM4856 is designed for cellular phone, PDA, and other
portable handheld applications. It delivers high quality output
power from a surface-mount package and requires only
eight external components.
The industry leading micro SMD package only utilizes 2mm
x 2.3mm of PCB space, making the LM4856 the most space
efficient audio sub system available today.
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
Key Specifications
n THD+N at 1kHz, 1.1W into 8Ω BTL
n THD+N at 1kHz, 60mW into 32Ω SE
n Single Supply Operation
Features
n 1.1W (typ) output power with 8Ω mono BTL load
n 60mW (typ) output power with stereo 32Ω SE loads
2
n I
C programmable 32 step digital volume control
2
C com-
n Eight distinct output modes
n micro-SMD and LLP surface mount packaging
n "Click and Pop" suppression circuitry
n Thermal shutdown protection
n Low shutdown current (0.1uA, typ)
Applications
n Moblie Phones
n PDAs
DS200607
May 2004
1.0% (typ)
0.5% (typ)
2.6 to 5.0V
20060732
www.national.com

LM4856LQBD Summary of contents

  • Page 1

    ... Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation Key Specifications n THD+N at 1kHz, 1.1W into 8Ω BTL n THD+N at 1kHz, 60mW into 32Ω Single Supply Operation Features n 1.1W (typ) output power with 8Ω ...

  • Page 2

    Connection Diagrams Top View (Bump-side down) Order Number LM4856ITL See NS Package Number TLA18AAA LLP Package Top View Order Number LM4856LQ See NS Package Number LQA24A for Exposed-DAP LLP www.national.com 18-Bump micro SMD Marking (ITL) 200607A9 Z - Assembly Plant ...

  • Page 3

    ... 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 ESD Susceptibility (Note 4) ESD Machine model (Note 7) Junction Temperature ( Solder Information (Note 1) Vapor Phase (60 sec.) Infrared (15 sec.) ...

  • Page 4

    Electrical Characteristics The following specifications apply for V Symbol Parameter V Logic Low Input Voltage IL Digital Volume Range (R and Digital Volume Range (Phone_In_HS) Digital Volume Stepsize Digital Volume Stepsize Error Phone_In_IHF Volume Phone_In_IHF Mute ...

  • Page 5

    Electrical Characteristics The following specifications apply for V Symbol Parameter I Supply Current DD I Shutdown Current SD V Output Offset Voltage OS P Output Power O Total Harmonic Distortion Plus THD+N Noise N Output Noise OUT Power Supply Rejection ...

  • Page 6

    Electrical Characteristics The following specifications apply for V Symbol Parameter Digital Volume Range (R and Digital Volume Range (Phone_In_HS) Digital Volume Stepsize Digital Volume Stepsize Error Phone_In_IHF Volume Phone _In_IHF Mute Attenuation Phone_In_IHF Input Impedance Phone_In_HS ...

  • Page 7

    External Components Description Components 1. C This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the amplifier’s IN input terminals 1/(2π This is the ...

  • Page 8

    Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency www.national.com (Continued) THD+N vs Frequency 200607G7 THD+N vs Frequency 200607B5 THD+N vs Frequency 200607H0 8 200607G8 200607G9 200607H1 ...

  • Page 9

    Typical Performance Characteristics THD+N vs Output Power LM4856LQ THD+N vs Output Power THD+N vs Output Power (Continued) THD+N vs Output Power 200607F2 THD+N vs Output Power 200607B9 THD+N vs Output Power 200607C1 9 LM4856LQ 200607F3 200607H2 200607H3 www.national.com ...

  • Page 10

    Typical Performance Characteristics Power Supply Rejection Ratio Power Supply Rejection Ratio Power Supply Rejection Ratio www.national.com (Continued) Power Supply Rejection Ratio 200607C3 Power Supply Rejection Ratio 200607C5 Power Supply Rejection Ratio 200607C7 10 200607H4 200607H5 200607H6 ...

  • Page 11

    Typical Performance Characteristics Output Power vs Supply Voltage Output Power vs Load Resistance Power Dissipation vs Output Power (Continued) Output Power vs Supply Voltage 200607D7 Output Power vs Load Resistance 200607D9 Power Dissipation vs Output Power 200607E1 11 200607H7 200607H8 ...

  • Page 12

    Typical Performance Characteristics Supply Current vs Supply Voltage Frequency Response www.national.com (Continued) Channel Separation 200607C9 Frequency Response 200607D4 Frequency Response 200607I1 12 200607I2 200607I0 ...

  • Page 13

    Typical Performance Characteristics Output Mode gain from gain from LIN/RIN to LOUT/ROUT A - weighted filter used (Continued) Output Noise vs Output Mode (V = 3V, 5V) DD ...

  • Page 14

    Application Information PIN DESCRIPTION SDA: This is the serial data input pin. SCL: This is the clock input pin. ADR: This is the address select input pin INTERFACE The LM4856 uses a serial bus, ...

  • Page 15

    Application Information BIT D7 D6 Function Name V4 V3 Default Handsfree Speaker Output 12dB x P IHF MUTE 12dB x P IHF ...

  • Page 16

    Application Information ...

  • Page 17

    ... LM4856’s thermal shutdown protection. Further detailed and specific information con- cerning PCB layout and fabrication and mounting an LD (LLP) is found in National Semiconductor’s AN1187. PCB LAYOUT AND SUPPLY REGULATION CONSIDERATIONS FOR DRIVING 3Ω AND 4Ω LOADS Power dissipated by a load is a function of the voltage swing across the load and the load’ ...

  • Page 18

    Application Information temperature that still allows maximum stereo power dissipa- tion without violating the LM4856’s maximum junction tem- perature JMAX DMAX-TOTAL For a typical application with a 5V power supply and an 8Ω load, ...

  • Page 19

    Demonstration ITL/LQ Board Layout Recommended ITL PC Board Layout: Top Overlay Layer Recommended ITL PC Board Layout: Middle 1 Layer 200607G0 Recommended ITL PC Board Layout: 200607F7 Recommended ITL PC Board Layout: Middle 2 Layer 19 200607F9 Top Layer 200607F8 ...

  • Page 20

    Demonstration ITL/LQ Board Layout Recommended ITL PC Board Layout: Bottom Layer Recommended LQ PC Board Layout: Top Layer www.national.com (Continued) 200607F6 Recommended LQ PC Board Layout: Top Overlay Layer 200607G4 Recommended LQ PC Board Layout: Middle 1 Layer 20 200607G5 ...

  • Page 21

    Demonstration ITL/LQ Board Layout Recommended LQ PC Board Layout: Middle 2 Layer (Continued) 200607G3 Recommended LQ PC Board Layout: Bottom Layer 21 200607G1 www.national.com ...

  • Page 22

    Physical Dimensions 24-Lead MOLDED PKG, Leadless Leadframe Package LLP www.national.com inches (millimeters) unless otherwise noted Order Number LM4856LQ NS Package Number LQA24A 22 ...

  • Page 23

    ... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...