LM48860 Datasheet, PDF (1/21 Pages) National Semiconductor (TI) – Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo Headphone Amplifier

LM48860
www.ti.com
SNAS398D – JANUARY 2008 – REVISED MAY 2013
LM48860
Ground-Referenced, Ultra Low Noise, Fixed Gain
Stereo Headphone Amplifier
Check for Samples: LM48860
FEATURES
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•2 Fixed Logic Levels with Supply Voltage
• Ground Referenced Outputs
• High PSRR
• Available in Space-Saving DSBGA Package
• Ultra Low Current Shutdown Mode
• Improved Pop & Click Circuitry Eliminates
Noises During Turn-On and Turn-Off
Transitions
• No Output Coupling Capacitors, Snubber
Networks, Bootstrap Capacitors, or Gain-
Setting Resistors Required
• Shutdown Either Channel Independently
APPLICATIONS
• Mobile Phones
• MP3 Players
• PDAs
• Portable Electronic Devices
• Notebook PCs
KEY SPECIFICATIONS
• PSRR at 217Hz (V_DD = 3.0V): 80dB (typ)
• Stereo Power Output at V_DD = 3V, R_L = 16Ω,
THD+N = 1%: 40mW (typ)
• Shutdown Current 0.1μA (typ)
• Internal Fixed Gain: 1.5V/V (typ)
• Operating Voltage: 2.0V to 5.5V
DESCRIPTION
The LM48860 is a ground referenced, fixed-gain
audio power amplifier capable of delivering 40mW per
channel of continuous average power into a 16Ω
single-ended load with less than 1% THD+N from a
3V power supply.
The LM48860 features a new circuit technology that
utilizes a charge pump to generate a negative
reference voltage. This allows the outputs to be
biased about ground, thereby eliminating output-
coupling capacitors typically used with normal single-
ended loads.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM48860 does not require output coupling capacitors
or bootstrap capacitors, and therefore is ideally suited
for mobile phone and other low voltage applications
where minimal power consumption is a primary
requirement.
The LM48860 features a low-power consumption
shutdown mode selectable for either channel
separately. This is accomplished by driving either the
SD_RC (Shutdown Right Channel) or SD_LC
(Shutdown Left Channel) (or both) pins with logic low,
depending on which channel is desired shutdown.
Additionally, the LM48860 features an internal
thermal shutdown protection mechanism.
The LM48860 contains advanced pop & click circuitry
that eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
The LM48860 has an internal fixed gain of 1.5V/V.
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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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