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LM4549, LM4549 MDC, LM4549 MWC

Table of contents:
Info of LM4549
Info of LM4549 MDC
Info of LM4549 MWC

LM4549, LM4549 MDC, LM4549 MWC Selling Leads, Datasheet

MFG:N/A Package Cooled:QFP D/C:N/A

LM4549, LM4549 MDC, LM4549 MWC Datasheet download

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Part Number: LM4549

MFG: N/A

Package Cooled: QFP

D/C: N/A

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LM4549 General Description

The LM4549 is an audio codec for PC systems which is fully PC98 compliant and performs the analog intensive functions of the AC97 Rev2.1 architecture. Using 18-bit Sigma-Delta A/D's and D/A's, the LM4549 provides 90dB of Dynamic Range.

The LM4549 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's and D/A's and an analog mixer with 4 stereo and 3 mono inputs, each of which has separate gain, attenuation and mute control.

The codec features a second Line Output known as True Line Level Out that is identical to Line Out but with independent volume control. The LM4549 also features National's 3D Sound stereo enhancement and variable sample rate conversion. The sample rate for the A/D and D/A can be programmed separately with a resolution of 1Hz to convert any rate between 4kHz-48kHz. The AC97 architecture separates the analog and digital functions of the PC audio system allowing both for system design flexibility and increased performance.

LM4549 Maximum Ratings

Supply Voltage
Storage Temperature
Input Voltage
ESD Susceptibility (Note 5)
pin 3
ESD Susceptibility (Note 6)
pin 3
Junction Temperature
Soldering Information
TQFP Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
See AN-450 ²Surface Mounting and their Effects on
Product Reliability² for other methods of
soldering surface mount devices.
qJA (typ)-VBH48A

6.0V
−65°C to +150°C
−0.3V to VDD +0.3V
2000V
750V
200V

100V
150°C
215°C
220°C

74°C/W

LM4549 Features

AC'97 Rev 2.1 compliant
National's 3D Sound circuitry
High quality Sample Rate Conversion (SRC) from 4kHz to 48kHz in 1Hz increments.
Multiple Codec Support
External Amplifier Power Down (EAPD) control from codec
PC-Beep passthrough to Line Out while reset is held active low
True Line Level Output with volume control independent of Line Out
Digital 3V and 5V compliant

LM4549 Typical Application

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

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