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LM4921 Datasheet

  • LM4921

  • Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone Powe...

  • 18頁

  • NSC

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LM4921 Low Voltage I
2
S 16-Bit Stereo DAC with Stereo Headphone Power Amplifiers and Volume
Control
November 2004
LM4921
Low Voltage I
2
S 16-Bit Stereo DAC with Stereo
Headphone Power Amplifiers and Volume Control
General Description
The LM4921 combines a 16-bit resolution stereo I S input
digital-to-analog converter (DAC) with a stereo headphone
audio power amplifier. It is primarily designed for demanding
applications in mobile phones and other portable communi-
cation device applications. The LM4921 features an I
2
S
serial interface for the digital audio information and a 16-bit
SPI serial interface for internal register control and commu-
nication. With AV
DD
and DV
DD
= 3.0V
DC
and driving a 32鈩?/div>
single-ended load to a 26mW
RMS
output level the distortion
(THD+N) of the LM4921 will be less than 0.5%. The LM4921
also features a programmable 32-step digital volume control
accessed through an SPI interface.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. It is, therefore, ideally suited for mo-
bile phone and other low voltage applications where minimal
power consumption is a primary requirement.
The LM4921 features a low-power consumption shutdown
mode, and also has an internal thermal shutdown protection
mechanism.
2
Key Specifications
j
PSRR at 217Hz, A/DV
DD
= 3V, (Fig. 1)
j
P
OUT
at AV
DD
= 3.0V, 32鈩?/div>
52dB (typ)
13mW (typ)
26mW (typ)
2.6V to 5.0V
2.6V to 5.5V
1碌A(chǔ) (typ)
<
0.05% THD
<
0.5% THD
j
Supply voltage range
DV
DD
AV
DD
(Note 8)
j
Shutdown current
Features
n
n
n
n
n
n
n
n
n
n
16-bit resolution stereo DAC
I
2
S digital audio data serial interface
SPI serial interface (control register)
Volume Control (32 steps; 1.5 dB increments)
Up to 50mW/channel stereo headphone amplifier
Zero Crossing Detection for Silent Attenuation Steps
2.6V
DC
to 5.0V
DC
digital supply voltage range
2.6V
DC
to 5.5V
DC
analog supply voltage range (Note 8)
Unity-gain stable headphone amplifiers
Available in the 20-bump microSMD package
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200486
www.national.com

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