LM4560 Datasheet | National Semiconductor

Description LM4560 is an advanced PCI audio accelerator providing full legacy patibility, wavetable synthesis, Direct Music, Direct Sound, and Direct Sound3D on a single chip for the highperformance, cost-sensitive consumer market. It supports Sound Blaster functionality and is fully PC98 pliant. The LM4560 integrates a 64-voice wave table engine with per voice effect processing capability. It supports the uping Microsoft™ Direct Music API and is fully patible with DLS Level 1 (downloadable samples) specification. The LM4560 is optimized for Microsoft Windows™ 98 and Windows NT5.0 WDM streaming architecture with re-routable end-point support. The LM4560 includes Direct Sound3D acceleration hardware for ITD (Interaural Time Difference), IID (Interaural Intensity Difference), Pan, Delay, and Doppler hardware. The LM4560 supports Sound Blaster Pro/16 DOS games while improving gaming audio quality. The LM4560 supports both the legacy analog gameport and a Digital Enhanced Game Port. When coupled with Direct Input™ driver, the Digital Enhanced Game Port can save up to 12% of the CPU overhead nominally required by a conventional analog game port. The LM4560 employs a high precision 26-bit digital mixer, providing an accurate 20-bit output and higher than 90 d B signal-to-noise ratio when used with high quality AC97 Rev 1.03 and Rev 2.0 codecs. The LM4560 is designed with aggressive power management. It is PCI Bus Power Management Interface (PPMI 1.0)-pliant. The LM4560 supports multiple Rev 2.0 AC97 codecs, which are useful for notebook docking systems. With a low power, 3.3V process and a space conscious 100 TQFP package, the LM4560 is also well suited for Notebook systems. In summary, the LM4560 provides a balanced bination of features and performance to the end-user. By bining PCI bus mastering for Direct Sound acceleration, Hardware Wave table synthesizer, Digital Enhanced Game Port and Direct Sound 3D audio acceleration. It delivers high performance, high quality audio,...