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LM4930_04 Datasheet

  • LM4930_04

  • National Semiconductor [Audio Subsystem with Stereo Headpho...

  • 994.35KB

  • NSC

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LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers
September 2004
LM4930
Audio Subsystem with Stereo Headphone & Mono
Speaker Amplifiers
General Description
The LM4930 is an integrated audio subsystem that supports
voice and digital audio functions. The LM4930 includes a
high quality I
2
S input stereo DAC, a voice band codec, a
stereo headphone amplifier and a high-power mono speaker
amplifier. It is primarily designed for demanding applications
in mobile phones and other portable devices.
The LM4930 features an I
2
S serial interface for full range
audio, a 16-bit PCM bi-directional serial interface for the
voice band codec and an two-wire interface for control. The
full range music path features an SNR of 86dB with a 16-bit
48kHz input. The stereo DAC can also be used while the
voice codec is in use. The headphone amplifier delivers
25mW
RMS
to a 32鈩?single-ended stereo load with less than
0.5% distortion (THD+N) when AV
DD
= 3V. The mono
speaker amplifier delivers up to 330mW into an 8鈩?load with
less than 1% distortion when AV
DD
= 3V.
The LM4930 employs advanced techniques to reduce power
consumption, to reduce controller overhead and to eliminate
click and pop. Boomer audio power amplifiers were de-
signed specifically to provide high quality output power with
a minimal amount of external components. It is, therefore,
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
Key Specifications
j
P
LS
j
P
LS
OUT
at AV
DD
= 5.0V, 8鈩?/div>
1W (typ)
330mW (typ)
25mW (typ)
2.6V to 4.5V
2.6V to 5.5V
2碌A (typ)
50dB (typ)
at AV
DD
= 3.0V, 8鈩?/div>
at AV
DD
= 3.0V, 32鈩?/div>
1% THD+N
OUT
1% THD+N
j
P
H/P
OUT
0.5% THD+N
j
Supply voltage range
DV
DD
(Note 8)
AV
DD
(Note 8)
j
Total shutdown current
j
PSRR at 217Hz, AV
DD
= 3V
Features
16-bit resolution 48kHz stereo DAC
16-bit resolution 8kHz voice codec
I
2
S digital audio data serial interface
Two-wire serial control interface
PCM voice audio data serial interface
25mW/channel stereo headphone amplifier
330mW mono 8鈩?amplifier (at AV
DD
= 3.0V)
32-step volume control for audio output amplifiers
No snubber networks or bootstrap capacitors are
required by the headphone or hands-free amplifiers
n
Digital sidetone generation with adjustable attenuation
n
Gain controllable headphone amp, mono BTL amp, mic
preamp
n
Available in the 36鈥揵ump micro SMD and 44鈥搇ead LLP
packages
n
n
n
n
n
n
n
n
n
Applications
n
Mobile Phones
n
Mobile/low power audio appliances
n
PDAs
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200720
www.national.com

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