LM4550
Description
The LM4550 is an audio codec for PC systems which is fully PC99 pliant and performs the analog intensive functions of the AC97 Rev2.1 architecture.
Key Features
- n AC’97 Rev 2.1 pliant
- Several LM4550s can be bined together for up to 6 channel operation
- Unique National chaining function allows multiple codecs to be connected serially and use only a single controller SDATA_IN pin
- High quality Sample Rate Conversion (SRC) from 4 kHz to 48 kHz in 1 Hz increments
- Stereo headphone amp with separate gain control
- National’s 3D Sound circuitry
- External Amplifier Power Down (EAPD) control from codec
- PC-Beep passthrough to Line Out while reset is held active low
- Digital 3.3V and 5V pliant
Applications
- Portable PC systems as on MDC cards, or with a chipset or accelerator featuring AC-Link n 2, 4, or 6 channel systems
