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LM4985TMEVAL Fiches technique(PDF) 1 Page - Texas Instruments

No de pièce LM4985TMEVAL
Description  LAudio Power Amplifier Series Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM4985TMEVAL Fiches technique(HTML) 1 Page - Texas Instruments

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LM4985, LM4985TMEVAL
www.ti.com
SNAS346B – MAY 2006 – REVISED MAY 2006
LM4985 Boomer™ Audio Power Amplifier Series Stereo 135mW Low Noise Headphone
Amplifier with Selectable Capacitively Coupled or Output Capacitor-less (OCL) Output
and Digitally Controlled (I2C) Volume Control
Check for Samples: LM4985, LM4985TMEVAL
1
FEATURES
DESCRIPTION
The LM4985 is a stereo audio power amplifier with
23
OCL or Capacitively Coupled Outputs (Patent
internal
digitally
controlled
volume
control.
This
Pending)
amplifier is capable of delivering 68mWRMS per
I2C Digitally Controlled Volume Control
channel into a 16
Ω load or 38mWRMS per channel
Available in Space-Saving 0.4mm Lead-Pitch
into a 32
Ω load at 1% THD when powered by a 3.6V
power supply and operating in the OCL mode.
DSBGA Package
Volume Control Range: –76dB to +18dB
Boomer
audio
power
amplifiers
were
designed
specifically to provide high quality output power with a
Ultra Low Current Shutdown Mode
minimal amount of external components. To that end,
2.3V - 5.5V Operation
the LM4985 features two functions that optimize
Ultra Low Noise
system cost and minimize PCB area: an integrated,
digitally controlled (I2C bus) volume control and an
APPLICATIONS
operational
mode
that
eliminates
output
signal
coupling capacitors (OCL mode). Since the LM4985
Mobile Phones
does
not
require
bootstrap
capacitors,
snubber
PDAs
networks, or output coupling capacitors, it is optimally
suited
for
low-power,
battery
powered
portable
Portable Electronics Devices
systems. For added design flexibility, the LM4985 can
MP3 Players
also be configured for single-ended capacitively
coupled outputs.
KEY SPECIFICATIONS (VDD = 3.6V)
The LM4985 features a current shutdown mode for
PSRR: 217Hz and 1kHzs
micropower
dissipation
and
thermal
shutdown
Output Capacitor-Less (OCL)
protection.
fRIPPLE = 217Hz, 77dB (Typ)
fRIPPLE = 1kHz, 76dB (Typ)
Capacitor Coupled (C-CUPL)
fRIPPLE = 217Hz, 63dB (Typ)
fRIPPLE = 1kHz, 62dB (Typ)
Output Power Per Channel
(fIN = 1kHz, THD+N = 1%),
RL = 16Ω, OCL
VDD = 2.5V, 31mW (Typ)
VDD = 3.6V, 68mW (Typ)
VDD = 5.0V, 135mW (Typ)
THD+N (f = 1kHz)
RLOAD = 16Ω, OCL, POUT = 60mW, 0.60
RLOAD = 32Ω, OCL, POUT = 33mW, 0.031
Shutdown Current, 0.1µA (Typ)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
Boomer is a trademark of Texas Instruments.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006, Texas Instruments Incorporated
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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