LM48860_14 Datasheet, PDF (1/24 Pages) Texas Instruments – Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo Headphone Amplifier

LM48860
www.ti.com
SNAS398C – JANUARY 2008 – REVISED OCTOBER 2008
LM48860
Ground-Referenced, Ultra Low Noise, Fixed Gain
Stereo Headphone Amplifier
Check for Samples: LM48860
FEATURES
1
•2 Fixed logic levels with supply voltage
• Ground referenced outputs
• High PSRR
• Available in space-saving micro SMD 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
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.
■ PSRR at 217Hz (V_DD = 3.0V)
■ Stereo Power Output at V_DD = 3V
R_L = 16Ω, THD+N = 1%
■ Shutdown Current
■ Internal Fixed Gain
■ Operating Voltage
Table 1. Key Specifications
VALUE
80
40
0.1μA (typ)
1.5V/V (typ)
2.0V to 5.5
UNIT
dB (typ)
mW (typ)
V
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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 © 2008, Texas Instruments Incorporated