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Company News


National Semiconductor Introduces
DC'97 Audio Accelerator

Now Supplies Entire PC Audio Chain from CPU to Amplifier

November 30, 1998 - National Semiconductor Corporation® today announced the LM4560, an advanced DC '97 PCI audio accelerator. With the addition of the LM4560 to its portfolio of audio products, National becomes the only IC supplier to offer the entire PC audio chain, from CPU to amplifier.

Designed for cost-sensitive multimedia PC and audio add-in card applications, the LM4560 provides significant system level performance enhancement over an equivalent ISA audio controller. The high-performance, single-chip audio accelerator integrates a 64-voice wave table engine with per voice effect processing capability. In addition, the accelerator also supports 32 simultaneous digital audio channels, which permits greater realism in video games by simultaneously playing many different WAV file sound effects, plus Doppler effects.

"National is committed to providing a full suite of high-performance solutions for the PC audio market. This accelerator not only completes the audio chain that we offer, but it provides a balanced combination of features and performance to the end-user," said Parviz Ghaffaripour, National's audio product line director. "Especially in the growing game and entertainment platforms, a high-end PC audio system is becoming more and more important to the average PC user."

The LM4560 offers Audio Modem CODEC (AMC) support and is fully compatible with the DLS Level 1 (downloadable samples) specification. This support provides full duplex speakerphone and fax-modem capability by using the CODEC and host-based software. Also, DLS1 will provide the flexibility of utilizing multiple sample sets. This gives the user flexibility to choose which samples set they wish to play. Depending on the file the user is playing, each sample set can provide different instrument audio quality.

Additional features of the LM4560 accelerator include:

  • PCI Bus Power Management Interface (PPMI 1)
  • 3.3V operation
  • Multiple CODEC support for docking stations and more than two speaker systems
  • Full Legacy compatibility (SoundBlaster® and DMA), wavetable synthesis, DirectMusic®, DirectSoundä 2D/3D
  • MIDI port support (MPU 401)
  • Digital/Analog game port interface
  • I2S input/output support
  • SP/DIF output support

Pricing and Availability
Housed in a space-conscious 100-pin TQFP (thin quad flatpack), the LM4560 is priced at $8.00 in quantities of 1000. It is available now in production quantities. For more information on the LM4560, visit our website at

National Semiconductor provides system-on-a-chip solutions for the information age. Combining real-world analog and state-of the-art digital technology, the company's chips lead many sectors of the personal computer, communications, and consumer markets. With headquarters in Santa Clara, California, National has annual sales of approximately $2.5 billion and 12,000 employees worldwide. Additional company and product information is available on the World Wide Web at


National Semiconductor Contact
Customer Response Group:
World Wide Web:

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