LM4549B集成电路（IC）的编解码器规格书PDF中文资料

LM4549B属于集成电路（IC）的编解码器。由德州仪器制造生产的LM4549B编解码器编解码器是用于通过压缩和解压缩来转换数据的半导体器件。数据压缩可提高传输速度并减少存储空间。某些编解码器提供高达 32 位的分辨率，并且分别提供多达 6 个或 8 个模数转换器和数模转换器。除三角积分调制外，还有 I2C、I2S、SPI、串行、HDA、S/DIF、PCM、USB、AC'97 和 SLIMbus 数据接口。

1 Features

1• Compliant With AC '97 Rev 2.1

• High-Quality Sample Rate Conversion from 4 kHz

to 48 kHz in 1-Hz Increments

• Multiple Codec Support

• True Line Level Output with Separate Gain

Control

• Texas Instrument's 3D Sound Stereo

Enhancement Circuitry

• Advanced Power Management Support

• External Amplifier Power Down (EAPD) Control

• PC-Beep Passthrough to Line Out During

Initialization or Cold Reset

• Digital 3.3-V and 5-V Supply Options

• Extended Temperature: −40°C ≤ TA ≤ 85°C

• Key Specifications

– Analog Mixer Dynamic Range: 97 dB (Typical)

– DAC Dynamic Range: 89 dB (Typical)

– ADC Dynamic Range: 90 dB (Typical)

2 Applications

• Desktop PC Audio Systems on PCI Cards, AMR

Cards, or With Motherboard Chips Sets Featuring

AC Link

• Portable PC Systems as on MDC Cards, or With a

Chipset or Accelerator Featuring AC Link

• General and Multichannel Audio Frequency

Systems

• Automotive Telematics

3 Description

The LM4549B device is an audio codec for PC

systems which is fully compliant with the PC99 and performs the analog intensive functions of the AC '97

Rev 2.1 architecture. Using 18-bit sigma-delta ADCs

and DACs, the LM4549B provides 90 dB of dynamic

range.

The LM4549B 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

LM4549B supports Texas Instrument's 3D Sound stereo enhancement and a comprehensive sample

rate conversion capability. The sample rate for the

ADCs and DACs can be programmed 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 completely

deterministic to ease task scheduling and application

software development. These features together with

an extended temperature range also make the

LM4549B suitable for non-PC codec applications.