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LM4947 Folha de dados(PDF) 1 Page - Texas Instruments

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Nome de Peças LM4947
Descrição Electrónicos  Mono Class D and Stereo Audio Sub-System with OCL Headphone Amplifier and National 3D
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM4947 Folha de dados(HTML) 1 Page - Texas Instruments

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LM4947, LM4947TLEVAL
www.ti.com
SNAS349C – JUNE 2006 – REVISED NOVEMBER 2007
LM4947
Mono Class D and Stereo Audio Sub-System
with OCL Headphone Amplifier and National 3D
Check for Samples: LM4947, LM4947TLEVAL
1
FEATURES
2
I2C Control Interface
Thermal shutdown protection
I2C programmable National 3D Audio
Low shutdown current (0.1
μA, typ)
I2C controlled 32 step digital volume control (-
RF suppression
59.5dB to +18dB)
Differential mono and stereo inputs
Three independent volume channels (Left,
Stereo input mux
Right, Mono)
Eight distinct output modes
APPLICATIONS
Small, 25–bump micro SMD packaging
Mobile Phones
“Click and Pop” suppression circuitry
PDAs
DESCRIPTION
The LM4947 is an audio subsystem capable of efficiently delivering 500mW (Class D operation) of continuous
average power into a mono 8
Ω bridged-tied load (BTL) with 1% THD+N, 37mW (Class AB operation) power
channel of continuous average power into stereo 32
Ω 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-channel 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 programmed through a two-wire I2C compatible interface that 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 components in SE mode).
Table 1. Key Specifications
VALUE
UNIT
THD+N at 1kHz, 500mW
into 8
Ω BTL (3.3V)
1.0% (typ)
THD+N at 1kHz, 37mW
into 32
Ω SE (3.3V)
1.0% (typ)
Single Supply Operation (VDD)
2.7 to 5.5
V
I2C Single Supply Operation
2.2 to 5.5
V
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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