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LM4543VH Datasheet

  • LM4543VH

  • AC ’97 Codec with National 3D Sound

  • 16頁

  • NSC

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LM4543 AC 鈥?7 Codec with National 3D Sound
February 1999
LM4543
AC 鈥?7 Codec with National 3D Sound
General Description
The LM4543 is an audio codec for PC systems which per-
forms the analog-intensive function of the Analog Codec 鈥?7
Rev 1.03 architecture. Using 18-Bit
危鈭?/div>
A/D and D/A convert-
ers, the LM4543 provides 90dB of dynamic range.
The LM4543 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 A/D鈥檚 and D/A鈥檚
and an analog mixer with 4 stereo and 3 mono inputs, each
of which has separate gain, attenuation and mute control. In
addition, the LM4543 provides National鈥檚 3D Sound stereo
enhancement technology.
The LM4543 features AC-Link, a synchronous, fixed rate se-
rial bus for connection to the digital AC 鈥?7 Controller. The
separation of the analog and digital functions of the AC 鈥?7
architecture allows for system design flexibility and in-
creased overall performance.
Key Specifications
n
Analog Mixer Dynamic Range
n
D/A Dynamic Range
n
A/D Dynamic Range
95dB (typ)
89dB (typ)
90dB (typ)
Features
n
Audio Codec 鈥?7 compliant
n
Stereo 18-Bit
危鈭?/div>
A/D鈥檚 and D/A鈥檚 with 128X
oversampling
n
National鈥檚 3D Sound circuitry
n
Power management support
n
Digital Interface 3V and 5V compliant
Applications
n
Desktop PC Audio Systems
n
Portable PC Audio Systems
n
Mobile PC Audio Solutions
Block Diagram
DS100907-1
FIGURE 1. LM4543 Block Diagram
漏 1999 National Semiconductor Corporation
DS100907
www.national.com

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