STAC9750T-CA3

Codecs Overview

The STAC9750T-CA3 is a two-channel AC'97 audio CODEC conforming to Rev 2.2 specifications, manufactured by IDT. It features full-duplex stereo conversion with 18-bit ADCs and 20-bit DACs utilizing Sigma-Delta technology. The device supports independent sample rates for ADCs and DACs via hardware sample rate converters. Key electrical parameters include an analog LINE_OUT SNR of 90 dB, digital DAC SNR of 89 dB, and digital ADC SNR of 85 dB. It offers 20dB or 30dB microphone boost capability and includes a crystal elimination circuit. The component operates on +5 V analog power and communicates via the five-wire AC-Link protocol.

Codecs Feature Summary

• Integrated headphone amplifier capable of driving headphones without external amplification
• Supports SPDIF output format for digital audio transmission
• Includes General Purpose I/O (GPIO) for advanced architectural implementations
• Features IDT Surround (SS3D) stereo enhancement technology

Codecs Applications

• Motherboard audio integration
• PCI, AMR, CNR, and ACR expansion cards
• Daughter board audio solutions
• Multiple codec configurations for six-channel AC-3 playback in DVD applications

Codecs Procurement Notes

Verify the specific ordering suffix CA3 against the manufacturer's current documentation to confirm pinout compatibility and package type. Ensure the supply voltage requirements match the system design, as the STAC9750 variant requires a +5 V analog supply. Confirm that the AC'97 controller in the target system supports the Rev 2.2 specification required for proper initialization and operation.

Codecs Selection Notes

Select this component for systems requiring a standard two-channel stereo CODEC with integrated headphone drive. It is suitable for designs needing independent sample rate conversion for recording and playback paths. Consider the STAC9751 if a +3.3 V analog supply is preferred instead of the +5 V required by the STAC9750. Verify GPIO availability if digital mixing or volume control functions are required within the codec architecture.

Codecs Part Context

The STAC9750/9751 series represents IDT's value-line stereo AC'97 codecs designed for general-purpose PC audio applications. These components are pin-compatible with other models in the family, such as the STAC9700, STAC9721, STAC9744, STAC9756, and STAC9766. This compatibility allows for flexible design upgrades or replacements within existing AC'97 architectures while maintaining the same physical footprint and interface connections.

Codecs Replacement Considerations

The STAC9751 is a pin-compatible alternative offering identical functionality but operating on a +3.3 V analog supply instead of +5 V. Other compatible parts in the family include the STAC9700, STAC9721, STAC9744, STAC9756, and STAC9766.