LM4946 Datasheet, PDF (1/37 Pages) Texas Instruments – Output Capacitor-Less Audio Subsystem with Programmable TI 3D

LM4946
www.ti.com
SNAS335E – JANUARY 2006 – REVISED AUGUST 2007
LM4946
Output Capacitor-Less Audio Subsystem with
Programmable TI 3D
Check for Samples: LM4946
FEATURES
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•2 I²C/SPI Control Interface
• I²C/SPI Programmable TI 3D Audio
• I²C/SPI Controlled 32 Step Digital Volume
Control (-54dB to +18dB)
• Three Independent Volume Channels (Left,
Right, Mono)
• Eight Distinct Output Modes
• WQFN and DSBGA Surface Mount Packaging
• “Click and Pop” Suppression Circuitry
• Thermal Shutdown Protection
• Low Shutdown Current (0.02uA, typ)
• RF Immunity Topology
APPLICATIONS
• Mobile Phones
• PDAs
KEY SPECIFICATIONS
• THD+N at 1kHz, 540mW into 8Ω BTL (3.3V)
1.0% (typ)
• THD+N at 1kHz, 35mW into 32Ω SE (3.3V) 1.0%
(typ)
• Single Supply Operation (VDD) 2.7 to 5.5V
• I2C/SPI Single Supply Operation
– WQFN 2.2 to 5.5V
– DSBGA 1.7 to 5.5V
DESCRIPTION
The LM4946 is an audio power amplifier capable of
delivering 540mW of continuous average power into a
mono 8Ω bridged-tied load (BTL) with 1% THD+N,
35mW per 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 specifications as the SE configuration, from
a 3.3V power supply.
The LM4946 has three input channels: one pair for a
two-channel stereo signal and the third for a
differential single-channel mono input. The LM4946
features a 32-step digital volume control and eight
distinct output modes. The digital volume control, 3D
enhancement, and output modes (mono/SE/OCL) are
programmed through a two-wire I²C or a three-wire
SPI compatible interface that allows flexibility in
routing and mixing audio channels.
The LM4946 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 seven external components in the
OCL mode (two additional components in SE mode).
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated