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参数资料
型号： LM4548AVH/NOPB
厂商： NATIONAL SEMICONDUCTOR CORP
元件分类： 消费家电
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封装： 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48
文件页数： 1/28页
文件大小： 538K
代理商： LM4548AVH/NOPB
LM4548A
AC ’97 Rev 2 Multi-Channel Audio Codec with Sample
Rate Conversion and National 3D Sound
General Description
The LM4548A is an audio codec for PC systems which is
fully PC98 compliant and performs the analog intensive
functions of the AC ’97 Rev 2 architecture. Using 18-bit
Sigma-Delta ADCs and DACs, the LM4548A provides 90 dB
of Dynamic Range.
The LM4548A 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
LM4548A supports National’s 3D Sound stereo enhance-
ment and a comprehensive sample rate conversion capabil-
ity. The sample rate for the ADCs and DACs can be pro-
grammed 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 LM4548A suitable
for non-PC codec applications.
The LM4548A features the ability to connect several codecs
together using the Extended AC Link configuration of one
dedicated serial data signal to the Controller per codec.
LM4548A systems support up to 8 simultaneous channels of
streaming data on Input Frames (Codec to Controller) while
Output Frames (Controller to Codec) carry 2 streams to
multiple codecs. The LM4548A may also be used in systems
with the National LM4550 to support up to 6 simultaneous
channels of streaming data on Output Frames.
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)
Features
n
AC ’97 Rev 2 compliant
n
High quality Sample Rate Conversion from 4 kHz to 48
kHz in 1 Hz increments
n
Multiple codec support
n
True Line Level Output with separate gain control
n
National’s 3D Sound stereo enhancement circuitry
n
Advanced power management support
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 and Multi-channel audio frequency systems
May 2004
LM4548A
AC
’97
Rev
2
Multi-Channel
Audio
Codec
with
Sample
Rate
Conversion
and
National
3D
Sound
2004 National Semiconductor Corporation
DS200300
www.national.com
相关PDF资料
PDF描述
LM4548VHX SPECIALTY CONSUMER CIRCUIT, PQFP48
LM4548VH/NOPB SPECIALTY CONSUMER CIRCUIT, PQFP48
LM4548VHX/NOPB SPECIALTY CONSUMER CIRCUIT, PQFP48
LM4549AVH/NOPB SPECIALTY CONSUMER CIRCUIT, PQFP48
LM4550VH/NOPB SPECIALTY CONSUMER CIRCUIT, PQFP48
相关代理商/技术参数
参数描述
LM4548AVHX 制造商:Rochester Electronics LLC 功能描述:- Bulk
LM4548VH 制造商:Texas Instruments 功能描述:
LM4549 制造商:NSC 制造商全称:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound
LM4549A 制造商:NSC 制造商全称:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound
LM4549AVH 制造商:Rochester Electronics LLC 功能描述:AC97 REV2.1 CODEC - Bulk 制造商:OC White Company 功能描述:Audio Codec 2ADC / 2DAC 18-Bit 48-Pin LQFP Tray
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