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LM4549B_AC '97 Rev 2.1 Codec with 。。?


The LM4549B is an audio codec for PC systems which is fully PC99 compliant 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 Instruments 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.

The LM4549B features the ability to connect several codecs together using the Extended AC Link configuration of one dedicated serial data signal to the Controller per codec. LM4549B systems support up to 8 simultaneous channels of streaming data on Input Frames (Codec to Controller) while Output Frames (Controller to Codec) carry 2 streams to multiple codecs. The LM4549B may also be used in systems with the Texas Instruments LM4550B to support up to 6 simultaneous channels of streaming data on Output Frames.

The AC 97 architecture separates the analog and digital functions of the PC audio system allowing both for system design flexibility and increased performance.

  • AC 97 Rev 2.1 Compliant
  • 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 Instruments 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 3.3V and 5V Supply Options
  • Extended Temperature: ?40°C ≤ TA ≤ 85°C
Key Specifications
  • Analog Mixer Dynamic Range: 97 dB (typ)
  • DAC Dynamic Range: 89 dB (typ)
  • ADC Dynamic Range: 90 dB (typ)
参数 LM4549B
DACs (#) 2
# Inputs / # Outputs 7 / 3
Resolution (Bits) 18
Control Interface I2C SPI
Digital Audio Interface I2S
# of Digital Audio Interfaces 1
Bandwidth (kHz) 20
Additional Features 3D EQ SRC
Operating Temperature Range (C) -40 to 85
Pin/Package 48LQFP
Rating Catalog
标题 cd 大小 (KB) 日期
LM4549B AC 97 Rev 2.1 Multi-Chan Audio Codec w Samp Rate PDF 1247 2013q?5?2?/td>
标题 cd 大小 (KB) 日期
Using the MSP430 Launchpad as a Standalone I2C Host for Audio Products PDF 5359 2013q?10?28?/td>
Audio Serial Interface Configurations for Audio Codecs PDF 70 2010q?9?22?/td>
Solving Enumeration Errors in USB Audio DAC and CODEC Designs PDF 157 2009q?10?30?/td>
Configuring I2S to Generate BCLK from Codec Devices & WCLK from McBSP Port PDF 105 2009q?7?8?/td>
Out-of-Band Noise Measurement Issues for Audio Codecs PDF 145 2006q?12?6?/td>
Low Sampling Rate Operation SoundPlus Audio Data Converters and CODECs PDF 291 2000q?9?27?/td>
Control Port And Reset Operation SoundPlus Audio Converters and CODECs PDF 77 2000q?9?27?/td>
型号 状?/th> 温度 (oC) hQ美元) | Quantity 装 | 引脚 器g标记 装数量 | 载体
LM4549BVH/NOPB ACTIVE -40 to 85 联系客服 LQFP?(PT) | 48 LM4549 BVH 250 | JEDEC TRAY (10+1)
LM4549BVHX/NOPB ACTIVE -40 to 85 联系客服 LQFP?(PT) | 48 LM4549 BVH 1000 | LARGE T&R

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