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LM4930 Fiches technique(PDF) 1 Page - National Semiconductor (TI)

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No de pièce LM4930
Description  Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4930 Fiches technique(HTML) 1 Page - National Semiconductor (TI)

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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
2S 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
2S 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 toa32
Ω 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
Ω 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 PLS OUT at AVDD = 5.0V, 8
1% THD+N
1W (typ)
j PLS OUT at AVDD = 3.0V, 8
1% THD+N
330mW (typ)
j PH/P OUT at AVDD = 3.0V, 32
0.5% THD+N
25mW (typ)
j Supply voltage range
DV
DD (Note 8)
2.6V to 4.5V
AV
DD (Note 8)
2.6V to 5.5V
j Total shutdown current
2µA (typ)
j PSRR at 217Hz, AVDD = 3V
50dB (typ)
Features
n
16-bit resolution 48kHz stereo DAC
n
16-bit resolution 8kHz voice codec
n
I
2S digital audio data serial interface
n
Two-wire serial control interface
n
PCM voice audio data serial interface
n
25mW/channel stereo headphone amplifier
n
330mW mono 8
Ω amplifier (at AV
DD = 3.0V)
n
32-step volume control for audio output amplifiers
n
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–bump micro SMD and 44–lead LLP
packages
Applications
n
Mobile Phones
n
Mobile/low power audio appliances
n
PDAs
Boomer® is a registered trademark of National Semiconductor Corporation.
September 2004
© 2004 National Semiconductor Corporation
DS200720
www.national.com


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