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LM4540VH Datasheet

  • LM4540VH

  • National Semiconductor [AC ’97 Codec with National 3D Soun...

  • 301.51KB

  • NSC

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LM4540 AC 鈥?7 Codec with National 3D Sound
February 1999
LM4540
AC 鈥?7 Codec with National 3D Sound
General Description
The LM4540 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 LM4540 provides 90dB of dynamic range.
The LM4540 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 2 stereo and 3 mono inputs, each
of which has separate gain, attenuation and mute control. In
addition, the LM4540 provides National鈥檚 3D Sound stereo
enhancement technology.
The LM4540 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
PC Audio Systems Requiring Only 2 Stereo Inputs (CD,
Line) and 3 Mono Inputs (Mic, Phone, PC Beep)
Block Diagram
DS100906-1
FIGURE 1. LM4540 Block Diagram
漏 1999 National Semiconductor Corporation
DS100906
www.national.com

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