LM4546AVH NSC [National Semiconductor], LM4546AVH Datasheet - Page 7

• Manufacturer Part Number: LM4546AVH
• Description: AC 97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound
• Manufacturer: NSC [National Semiconductor]

Typical Application
APPLICATION HINTS
•
•
•
•
•
•
The LM4546A must be initialized by using RESET# to perform a Power-On-Reset as shown in the Power On Reset Timing
Diagram
V
Don't leave unused analog inputs floating. Tie all unused inputs together and connect to Analog Ground through a capacitor
(e.g. 0.1 µF)
Do not leave CD_GND floating when using the CD stereo input. CD_GND is the AC signal reference for the CD channels and
should be connected to the CD source ground (Analog Ground may also be acceptable) through a 1 µF capacitor
If using a non-standard AC Link controller take care to keep the SYNC and SDATA_IN signals low during Cold Reset to avoid
entering the ATE or Vendor test modes by mistake
The PC_Beep input should be explicitly muted if not used since it defaults to 0 dB gain on reset, unlike the mute default of the
other analog inputs
REF
must be pulled high to AV
FIGURE 1. LM4546A Typical Application Circuit, Single Codec, 1 Vrms inputs
DD
200308 Version 5 Revision 1
with a 10 kΩ resistor to ensure correct operation
Print Date/Time: 2009/07/15 15:26:52
7
20030803
www.national.com