LM4947TLEVAL National Semiconductor, LM4947TLEVAL Datasheet

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LM4947TLEVAL

Manufacturer Part Number
LM4947TLEVAL
Description
BOARD EVALUATION LM4947TL
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4947TLEVAL

Amplifier Type
Class D
Output Type
1-Channel (Mono) with Stereo Headphones
Max Output Power X Channels @ Load
1.19W x 1 @ 8 Ohm; 87mW x 2 @ 32 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4947
Lead Free Status / RoHS Status
Not applicable / Not applicable
© 2007 National Semiconductor Corporation
LM4947
Mono Class D and Stereo Audio Sub-System with OCL
Headphone Amplifier and National 3D
General Description
The LM4947 is an audio subsystem capable of efficiently de-
livering 500mW (Class D operation) of continuous average
power into a mono 8Ω bridged-tied load (BTL) with 1% THD
+N, 37mW (Class AB operation) power channel of continuous
average power into stereo 32Ω single-ended (SE) loads with
1% THD+N, or an output capacitor-less (OCL) configuration
with identical specification as the SE configuration, from a
3.3V power supply.
The LM4947 has six input channels: one pair for a two-chan-
nel stereo signal, the second pair for a secondary two-channel
stereo input, and the third pair for a differential single-channel
mono input. Additionally, the two sets of stereo inputs may be
configured as a single stereo differential input (differential left
and differential right). The LM4947 features a 32-step digital
volume control and eight distinct output modes. The digital
volume control, 3D enhancement, and output modes are pro-
grammed through a two-wire I
allows flexibility in routing and mixing audio channels.
The RF suppression circuitry in the LM4947 makes it well-
suited for GSM mobile phones and other portable applications
in which strong RF signals generated by an antenna (and long
output traces) may couple audibly into the amplifier.
The LM4947 is designed for cellular phones, PDAs, and other
portable handheld applications. It delivers high quality output
power from a surface-mount package and requires only eight
external components in the OCL mode (two additional com-
ponents in SE mode).
Key Specifications
Boomer® is a registered trademark of National Semiconductor Corporation.
■ 
■ 
■ 
■ 
into 8Ω BTL (3.3V)
into 32Ω SE (3.3V)
THD+N at 1kHz, 500mW
THD+N at 1kHz, 37mW
Single Supply Operation (V
I
2
C Single Supply Operation
DD
2
C compatible interface that
)
201735
2.7 to 5.5V
2.2 to 5.5V
1.0% (typ)
1.0% (typ)
Features
Applications
I
I
I
+18dB)
Three independent volume channels (Left, Right, Mono)
Eight distinct output modes
Small, 25–bump micro SMD packaging
“Click and Pop” suppression circuitry
Thermal shutdown protection
Low shutdown current (0.1μA, typ)
RF suppression
Differential mono and stereo inputs
Stereo input mux
Mobile Phones
PDAs
2
2
2
C Control Interface
C programmable National 3D Audio
C controlled 32 step digital volume control (-59.5dB to
November 9, 2007
www.national.com

Related parts for LM4947TLEVAL

LM4947TLEVAL Summary of contents

Page 1

... BTL (3.3V) ■  THD+N at 1kHz, 37mW into 32Ω SE (3.3V) ■  Single Supply Operation ( ■  Single Supply Operation Boomer® registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation Features ■ Control Interface ■ programmable National 3D Audio ■ ...

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Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit-Output Capacitor-less FIGURE 2. Typical Audio Amplifier Application Circuit-Single Ended www.national.com 2 201735d3 201735d4 ...

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Connection Diagrams 25-Bump micro SMD Top View micro SMD Marking 20173507 Top View XY - Date Code TT - Die Traceability G - Boomer Family 201735d2 www.national.com ...

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Pin Descriptions Bump Name Description A1 R Right Input Channel 2 or Right Differential Input - IN2 A2 L Left Input Channel 1 or Left Differential Input + IN1 A3 MIN+ Mono Channel Non-inverting Input A4 RHP Right Headphone 3D ...

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... 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 ESD Susceptibility (Note 3) ESD Machine model (Note 6) Junction Temperature ( Solder Information Electrical Characteristics 3.3V The following specifications apply for V ...

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Symbol Parameter Power Supply Rejection Ratio Loudspeaker out PSRR Power Supply Rejection Ratio R and L OUT OUT η Class D Efficiency CMRR Common-Mode-Rejection Ratio XTALK Crosstalk T Wake-Up Time from Shutdown WU Volume Control Step Size Error Digital Volume ...

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Electrical Characteristics 5V The following specifications apply for V Symbol Parameter I Quiescent Supply Current DDQ I Shutdown Current SD V Output Offset Voltage OS P Output Power O THD+N Total Harmonic Distortion + Noise N Output Noise OUT (Notes ...

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Symbol Parameter Power Supply Rejection Ratio Loudspeaker out PSRR Power Supply Rejection Ratio R and L OUT OUT η Class D Efficiency CMRR Common-Mode Rejection Ratio XTALK Crosstalk T Wake-Up Time from Shutdown WU Volume Control Step Size Error Digital ...

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(Notes 2, 7) The following specifications apply for V Symbol Parameter t Clock Period 1 t Clock Setup Time 2 t Data Hold Time 3 t Start Condition Time 4 t Stop Condition Time 5 V SPI ...

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Note 1: See AN-450 "Surface Mounting and their effects on Product Reliability" for other methods of soldering surface mount devices. Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For ...

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Typical Performance Characteristics THD+N vs Output Power = 8Ω 1kHz V = 3.3V Mode 1, MONO THD+N vs Output Power = 8Ω 1kHz V = 3.3V Mode 5, MONO THD+N ...

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THD+N vs Output Power = 32Ω 1kHz, Diff 3.3V Mode 4, SE THD+N vs Output Power = 32Ω 1kHz, Diff 3.3V Mode 6, SE ...

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THD+N vs Output Power = 32Ω 1kHz, Diff 5V Mode 2, OCL 20173555 THD+N vs Output Power = 32Ω 1kHz, Diff 5V Mode 4, ...

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THD+N vs Frequency = 8Ω 3.3V Diff In, Mode 1 THD+N vs Frequency = 8Ω 3.3V Diff In, Mode 3 THD+N vs Frequency = 32Ω ...

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THD+N vs Frequency = 32Ω 3.3V 12mW Mode 4,7, SE 20173531 THD+N vs Frequency = 32Ω 3.3V 12mW Mode 6, SE 20173533 THD+N vs ...

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THD+N vs Frequency = 32Ω 5V Diff In, Mode 2, OCL THD+N vs Frequency = 32Ω 5V Diff In, Mode 4,7, OCL THD+N vs Frequency = 32Ω, P ...

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PSRR vs Frequency V = 3.3V 0dB DD V Mode 1, MONO 20173516 PSRR vs Frequency V = 3.3V 0dB DD V Mode 2, SE 20173518 PSRR vs Frequency V = 3.3V 0dB DD ...

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PSRR vs Frequency V = 3.3V Mode 5, MONO PSRR vs Frequency V = 3.3V Mode 6, SE PSRR vs Frequency Mode 1, MONO www.national.com = 0dB 20173522 ...

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PSRR vs Frequency 0dB DD V Mode 2, SE 201735a8 PSRR vs Frequency 0dB DD V Mode 4, OCL 201735b0 PSRR vs Frequency 0dB DD ...

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PSRR vs Frequency Mode 6, SE Power Dissipation vs Output Power = 32Ω 1kHz V = 3.3V Mode 7, OCL Power Dissipation vs Output Power = 8Ω ...

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Power Dissipation vs Output Power = 32Ω 1kHz V = 3.3V Mode 20173598 Power Dissipation vs Output Power = 32Ω 1kHz Mode 7, ...

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Crosstalk vs Frequency = 32Ω 3.3V Mode 4, OCL Crosstalk vs Frequency = 32Ω 5V Mode 4, OCL Supply Current vs Supply Voltage No Load, Mode 7, OCL ...

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Supply Current vs Supply Voltage No Load, Mode MONO 201735d1 Supply Current vs Supply Voltage No Load, Mode Headphone SE 20173581 Output Power vs Supply Voltage = 32Ω, Mode OCL R ...

Page 24

Output Power vs Supply Voltage = 32Ω, Mode 7, OCL R L Efficiency vs Output Power = 8Ω, Mode BTL V = 3.3V www.national.com Output Power vs Supply Voltage R L 20173590 Efficiency vs ...

Page 25

Application Information PIN DESCRIPTION SDA: This is the serial data input pin. SCL: This is the clock input pin. ID_ENB: This is the address select input pin COMPATIBLE INTERFACE The LM4947 uses a serial ...

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Low Medium High Maximum Select L and R Stereo Pair IN1 IN1 Select L and R Stereo Pair IN2 IN2 Select L +L and R +R Stereo Pair IN1 IN2 IN1 IN2 Sets Stereo Inputs to Differential X = Don't ...

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Volume Step xVC4 ...

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Output MC2 MC1 MC0 Mode Number Note: L and R are selected by modes from Table ...

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AC gain where M represents some ratio of the nominal internal resistor, 20kΩ (see exam- ple below). (3D 2π M)(20kΩ 3dB C (nF) ...

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Further allowance should be made for increased ambient temperatures. The above examples assume that a device is a surface mount part operating around the maximum power dissipation point. Since internal power dissipation is a ...

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DEMO BOARD SCHEMATIC 31 www.national.com ...

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Revision History Rev 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 www.national.com Date 06/16/06 Initial release. 06/19/06 Changed the Class D Efficiency (n) on Typical limit (from 79 to 86) on the 5V specification table. 06/22/06 Added more ...

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Physical Dimensions inches (millimeters) unless otherwise noted X = 2.517 ± 0. – Bump micro SMD Order Number LM4947TL NS Package Number TLA25BBA Dimensions are in millimeters = 2.517 ± 0. 0.600 ± 0.10 2 ...

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... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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