LM4549
Overview
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.
- Analog Mixer Dynamic Range
- D/A Dynamic Range
- A/D Dynamic Range 97dB (typ) 89dB (typ) 90dB (typ) 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
