LM4545VH Datasheet

IC型号：
LM4545VH
PDF描述：
National Semiconductor [AC ’97 Codec with Stereo Headphone...
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LM4545 AC 鈥?7 Codec with Stereo Headphone Amplifier and National 3D Sound

PRELIMINARY

July 1999

LM4545

AC 鈥?7 Codec with Stereo Headphone Amplifier and

National 3D Sound

General Description

The LM4545 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 LM4545 provides 90dB of dynamic range.

The LM4545 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 LM4545 provides a stereo headphone amplifier

with an independent gain control and National鈥檚 3D Sound

stereo enhancement technology.

The LM4545 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

Analog Mixer Dynamic Range

D/A Dynamic Range

A/D Dynamic Range

Headphone THD+N at 50mW into 32鈩?/div>

95dB (typ)

89dB (typ)

90dB (typ)

0.02% (typ)

Features

Audio Codec 鈥?7 compliant

Stereo 18-Bit

危鈭?/div>

A/D鈥檚 and D/A鈥檚 with 128X

oversampling

Stereo headphone amp with separate gain control

National鈥檚 3D Sound circuitry

Power management support

Digital Interface 3V and 5V compliant

Applications

Desktop PC Audio Systems

Portable PC Audio Systems

Mobile PC Audio Solutions

Block Diagram

DS100069-1

FIGURE 1. LM4545 Block Diagram

漏 1999 National Semiconductor Corporation

DS100069

www.national.com

标准包装
250
类别
集成电路 (IC)
家庭
接口 - 编解码器
系列
-
类型
音频编解码器 '97
数据接口
串行
分辨率（位）
18 b
ADC / DAC 数量
2 / 2
三角积分调变
是
S/N 比，标准 ADC / DAC (db)
-
动态范围，标准 ADC / DAC (db)
90 / 89
电压 - 电源，模拟
4.2 V ~ 5.5 V
电压 - 电源，数字
3 V ~ 5.5 V
工作温度
-40°C ~ 85°C
安装类型
表面贴装
封装/外壳
48-LQFP
供应商设备封装
48-LQFP（7x7）
包装
托盘
其它名称
*LM4545VH

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