Datasheet > LM4540

LM4540

更新时间： 2024-09-25 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		解码器编解码器
页数	文件大小	规格书
16页	301K
描述
AC ’97 Codec with National 3D Sound

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LM4540 数据手册

February 1999

LM4540

AC ’97 Codec with National 3D Sound

General Description

Key Specifications

The LM4540 is an audio codec for PC systems which per-

forms the analog-intensive function of the Analog Codec ’97

Rev 1.03 architecture. Using 18-Bit Σ∆ A/D and D/A convert-

ers, the LM4540 provides 90dB of dynamic range.

n Analog Mixer Dynamic Range

n D/A Dynamic Range

95dB (typ)

89dB (typ)

90dB (typ)

n A/D Dynamic Range

The LM4540 was designed specifically to provide a high

quality audio path and provide all analog functionality in a PC Features

audio system. It features full duplex stereo A/D’s and D/A’s

n Audio Codec ’97 compliant

n Stereo 18-Bit Σ∆ A/D’s and D/A’s with 128X

oversampling

n National’s 3D Sound circuitry

n Power management support

n Digital Interface 3V and 5V compliant

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’s 3D Sound stereo

enhancement technology.

The LM4540 features AC-Link, a synchronous, fixed rate se-

rial bus for connection to the digital AC ’97 Controller. The

separation of the analog and digital functions of the AC ’97

architecture allows for system design flexibility and in-

creased overall performance.

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

DS100906

www.national.com

12 3 4 5 6 7...16

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