LM4543

Supply Voltage ....................6.0V
Storage Temperature .......−65°C to +150°C
Input Voltage ..........  −0.3V to VDD +0.3V
ESD Susceptibility (Note 5) ..........   2500V
pins 27, 28....................   1500V
pin 3.........................  750V
ESD Susceptibility (Note 6) ...........  200V
pin 3 ......................... 100V
Junction Temperature ..............150°C
Soldering Information
TQFP Package
Vapor Phase (60 sec.) ..............215°C
Infrared (15 sec.) .................220°C
See AN-450 ²Surface Mounting and their Effects on
Product Reliability² for other methods of
soldering surface mount devices.
qJA (typ)-VBH48A ............... 74°C/W

The LM4543 is an audio codec for PC systems which performs the analog-intensive function of the Analog Codec '97 Rev 1.03 architecture. Using 18-Bit SD A/D and D/A converters, the LM4543 provides 90dB of dynamic range.

The LM4543 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. In addition, the LM4543 provides National's 3D Sound stereo enhancement technology.

The LM4543 features AC-Link, a synchronous, fixed rate serial 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 increasedoverall performance.