LM49200 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – Stereo Class AB Audio Subsystem with a True Ground Headphone Amplifier

LM49200, LM49200TLEVAL
www.ti.com
SNAS459A – MAY 2009 – REVISED APRIL 2013
LM49200
Stereo Class AB Audio Subsystem with a True
Ground Headphone Amplifier
Check for Samples: LM49200, LM49200TLEVAL
FEATURES
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•2 Differential Mono Input and Stereo Single-
Ended Input
• 32-Step Digital Volume Control (-80 to +18dB)
• Three Independent Volume Channels (Left,
Right, Mono)
• Separate Headphone Volume Control
• Flexible Output for Speaker and Headphone
Output
• True Ground Headphone Amplifier Eliminates
Large DC Blocking Capacitors Reducing PCB
Space and Cost
• Receiver Pass-Through Capability
• Soft Enable Function
• RF Immunity Topology
• “Click and Pop” Suppression Circuitry
• Thermal Shutdown Protection
• Micro-Power Shutdown
• I²C Control Interface
• Available in Space-Saving DSBGA Package
KEY SPECIFICATIONS
• Supply Voltage (VDD): 2.7V ≤ VDD ≤ 5.5V
• I2C Supply Voltage: 1.7V ≤ I2CVDD ≤ 5.5V
• Output power at VDD = 5V, 1% THD+N
– RL = 8Ω speaker: 1.25W (typ)
– RL = 32Ω headphone: 38mW (typ)
• Output power at VDD = 3.3V, 1% THD+N
– RL = 8Ω speaker: 520W (typ)
– RL = 32Ω headphone: 38mW (typ)
• PSRR:
– VDD = 3.3V, 217Hz ripple, Mono In: 95dB
(typ)
• Shutdown power supply current 0.02μA (typ)
APPLICATIONS
• Portable Electronic Devices
• Mobile Phones
• PDAs
DESCRIPTION
The LM49200 is a fully integrated audio subsystem
with a stereo power amplifier capable of delivering
500mW of continuous average power per channel
into 8Ω with 1% THD+N using a 3.3V supply. The
LM49200 includes a separate stereo headphone
amplifier that can deliver 35mW per channel into
32Ω.
The LM49200 has three input channels. A pair of
single-ended inputs and a fully differential input
channel. The LM49200 features a 32-step digital
volume control on the input stage and an 8-step
digital volume control on the headphone output stage.
The digital volume control and output modes are
programmed through a two-wire I²C compatible
interface that allows flexibility in routing and mixing
audio channels.
The LM49200 is designed for cellular phone, PDA,
and other portable handheld applications. The high
level of integration minimizes external components.
The True Ground headphone amplifier eliminates the
physically large DC blocking output capacitors
reducing required board space and reducing cost.
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.
Copyright © 2009–2013, Texas Instruments Incorporated