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LM4947 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. LM4947
Description  Mono Class D and Stereo Audio Sub-System
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

LM4947 Datasheet(HTML) 1 Page - Texas Instruments

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LM4947, LM4947TLEVAL
SNAS349D – JUNE 2006 – REVISED MAY 2013
Mono Class D and Stereo Audio Sub-System
with OCL Headphone Amplifier and TI 3D
Check for Samples: LM4947, LM4947TLEVAL
The LM4947 is an audio subsystem capable of
I2C Control Interface
efficiently delivering 500mW (Class D operation) of
I2C Programmable Texas Instruments 3D
continuous average power into a mono 8
Ω bridged-
tied load (BTL) with 1% THD+N, 37mW (Class AB
I2C Controlled 32 Step Digital Volume Control
operation) power channel of continuous average
power into stereo 32
Ω single-ended (SE) loads with
(-59.5dB to +18dB)
1% THD+N, or an output capacitor-less (OCL)
Three Independent Volume Channels (Left,
configuration with identical specification as the SE
Right, Mono)
configuration, from a 3.3V power supply.
Eight Distinct Output Modes
The LM4947 has six input channels: one pair for a
Small, 25–Bump DSBGA Packaging
two-channel stereo signal, the second pair for a
“Click and Pop” Suppression Circuitry
secondary two-channel stereo input, and the third pair
Thermal Shutdown Protection
Additionally, the two sets of stereo inputs may be
Low Shutdown Current (0.1
μA, typ)
configured as a single stereo differential input
RF Suppression
(differential left and differential right). The LM4947
features a 32-step digital volume control and eight
Differential Mono and Stereo Inputs
distinct output modes. The digital volume control, 3D
Stereo Input Mux
enhancement, and output modes are programmed
through a two-wire I2C compatible interface that
allows flexibility in routing and mixing audio channels.
THD+N at 1kHz, 500mW
into 8
Ω BTL (3.3V):
The RF suppression circuitry in the LM4947 makes it
1.0% (typ)
THD+N at 1kHz, 37mW
into 32
Ω SE (3.3V):
portable applications in which strong RF signals
1.0% (typ)
generated by an antenna (and long output traces)
may couple audibly into the amplifier.
Single Supply Operation (VDD): 2.7 to 5.5 V
The LM4947 is designed for cellular phones, PDAs,
I2C Single Supply Operation: 2.2 to 5.5 V
and other portable handheld applications. It delivers
high quality output power from a surface-mount
package and requires only eight external components
Mobile Phones
in the OCL mode (two additional components in SE
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2013, 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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