參數(shù)資料
型號： LM4550VHX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 X 1.40 MM, LQFP-48
文件頁數(shù)： 1/30頁
文件大小： 611K
代理商： LM4550VHX/NOPB
LM4550
AC ’97 Rev 2.1 Multi-Channel Audio Codec with Stereo
Headphone Amplifier, Sample Rate Conversion and
National 3D Sound
General Description
The LM4550 is an audio codec for PC systems which is fully
PC99 compliant and performs the analog intensive functions
of the AC ’97 Rev 2.1 architecture. Using 18-bit Sigma-Delta
ADCs and DACs, the LM4550 provides 90 dB of Dynamic
Range.
The LM4550 was designed specifically to provide a high
quality audio path and provide all analog functionality in a PC
audio system. It features full duplex stereo ADCs and DACs
and analog mixers with access to 4 stereo and 4 mono
inputs. Each mixer input has separate gain, attenuation and
mute control and the mixers drive 1 mono and 2 stereo
outputs, each with attenuation and mute control. The
LM4550 provides a stereo headphone amplifier as one of its
stereo outputs and also supports National’s 3D Sound stereo
enhancement and a comprehensive sample rate conversion
capability. The sample rate for the ADCs and DACs can be
programmed separately with a resolution of 1 Hz to convert
any rate in the range 4 kHz – 48 kHz. Sample timing from the
ADCs and sample request timing for the DACs are com-
pletely deterministic to ease task scheduling and application
software development. These features together with an ex-
tended temperature range also make the LM4550 suitable
for non-PC codec applications.
The LM4550 features the ability to connect several codecs
together in a system to provide up to 6 simultaneous chan-
nels of streaming data on Output Frames (Controller to
Codec) for surround sound applications. Such systems can
also support up to 8 simultaneous channels of streaming
data on Input Frames (Codec to Controller). Multiple codec
systems can be built either using the standard AC Link
configuration (i.e. of one serial data signal to the Controller
per codec) or using a unique National Semiconductor fea-
ture for chaining codecs together. This chain feature shares
only a single data signal to the controller among multiple
codecs.
The AC ’97 architecture separates the analog and digital
functions of the PC audio system allowing both for system
design flexibility and increased performance.
Key Specifications
n
Analog Mixer Dynamic Range
97 dB (typ)
n
DAC Dynamic Range
89 dB (typ)
n
ADC Dynamic Range
90 dB (typ)
n
Headphone Amp THD+N at 50 mW
0.02% (typ)
into 32
Features
n
AC ’97 Rev 2.1 compliant
n
High quality Sample Rate Conversion from 4 kHz to 48
kHz in 1 Hz increments
n
Supports up to 6 DAC channel systems with multiple
LM4550s or with other National LM45xx codecs
n
Unique National chaining function shares a single
controller SDATA_IN pin among multiple codecs
n
Stereo headphone amp with separate gain control
n
National’s 3D Sound stereo enhancement circuitry
n
Advanced power management support
n
External Amplifier Power Down (EAPD) control
n
PC Beep passthrough to Line Out during Initialization or
Cold Reset
n
Digital 3.3V and 5V supply options
n
Extended Temperature: 40C
≤ T
A
≤ 85C
Applications
n
Desktop PC audio systems on PCI cards, AMR cards, or
with motherboard chips sets featuring AC Link
n
Portable PC systems as on MDC cards, or with a
chipset or accelerator featuring AC Link
n
General Audio Frequency Systems requiring 2, 4 or 6
DAC channels and/or up to 8 ADC channels
May 2004
LM4550
AC
’97
Rev
2.1
Multi-Channel
Audio
Codec
with
Stereo
Headphone
Amplifier
,
Sample
Rate
Conversion
and
National
3D
Sound
2004 National Semiconductor Corporation
DS100972
www.national.com
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