LM49120 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – Audio Sub-System with Mono Class AB Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier

LM49120, LM49120TLEVAL
www.ti.com
SNAS431C – JUNE 2008 – REVISED MAY 2013
LM49120
Audio Sub-System with Mono Class AB
Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier
Check for Samples: LM49120, LM49120TLEVAL
FEATURES
1
•2 RF Immunity
• Selectable OCL/SE Headphone Drivers
• 32 Step Volume Control
• Click and Pop Suppression
• Independent Speaker and Headphone Gain
Settings
• Minimum External Components
• Thermal Over Load Protection
• Micro-power Shutdown
• Space Saving 16–bump DSBGA Package
• Thermal Shutdown Protection
• Micro-power Shutdown
• I²C Control Interface
DESCRIPTION
The LM49120 is a compact audio subsystem
designed for portable handheld applications such as
cellular phones. The LM49120 combines a mono
1.3W speaker amplifier, stereo 85mW/ch output
capacitorless headphone amplifier, 32 step volume
control, and an input mixer/multiplexer into a single
16–bump DSBGA package.
The LM49120 has three input channels: two single-
ended stereo inputs and a differential mono input.
Each input features a 32-step digital volume control.
The headphone output stage features an 8 step (-
18dB – 0dB) attenuator, while the speaker output
stage has two selectable (0dB/+6dB) gain settings.
The digital volume control and mode control are
programmed through a two-wire I²C compatible
interface.
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronics
KEY SPECIFICATIONS
• Output Power at VDD = 5V:
– Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.3W
(typ)
– Headphone: RL = 32Ω, SE, THD+N ≤ 1%:
85mW (typ)
• Output Power at VDD = 3.6V:
– Speaker: RL = 8Ω, BTL, THD+N ≤ 1%:
632mW (typ)
• Output Power at VDD = 3.3V:
– Speaker: RL = 8Ω, BTL, THD+N ≤ 1%:
540mW (typ)
– Headphone: RL = 32Ω, OCL/SE, THD+N ≤
1%: 35mW (typ)
1
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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.
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