Part # LM4545 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM4545 AC 97 Codec with Stereo Headphone Amplifier and National 3D Sound

Part Details:

LM4545 PRELIMINARY July 1999 AC LM4545 97 AC 97 Codec with Stereo Headphone Amplifier andNational 3D Sound Codec General Description Key Specifications The LM4545 is an audio codec for PC systems which per- n Analog Mixer Dynamic Range 95dB (typ) forms the analog-intensive function of the Analog Codec 97 with Rev 1.03 Architecture. Using 18-Bit A/D and D/A convert- n D/A Dynamic Range 89dB (typ) ers, the LM4545 provides 90dB of dynamic range. n A/D Dynamic Range 90dB (typ) The LM4545 was designed specifically to provide a high n Headphone THD+N at 50mW into 32 0.02% (typ) Stereo quality audio path and provide all analog functionality in a PCaudio system. It features full duplex stereo A/D s and D/A s Features and an analog mixer with 4 stereo and 3 mono inputs, each n Audio Codec 97 compliant of which has separate gain, attenuation and mute control. Inaddition, the LM4545 provides a stereo headphone amplifier n Stereo 18-Bit A/D s and D/A s with 128X Headphone with an independent gain control and National s 3D Sound oversampling stereo enhancement technology. n Stereo headphone amp with separate gain control The LM4545 features AC-Link, a synchronous, fixed rate se- n National s 3D Sound circuitry rial bus for connection to the digital AC 97 Controller. The n Power management support separation of the analog and digital functions of the AC 97 n Digital Interface 3V and 5V compliant architecture allows for system design flexibility and in-creased overall performance. Applicationsn Desktop PC Audio Systems Amplifier n Portable PC Audio Systems n Mobile PC Audio Solutions Block Diagram and National 3D Sound DS100069-1 FIGURE 1. LM4545 Block Diagram © 1999 National Semiconductor Corporation

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LM4545.pdf Datasheet