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STAC9202 Datasheet(PDF) 16 Page - Integrated Device Technology |
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STAC9202 Datasheet(HTML) 16 Page - Integrated Device Technology |
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16 / 135 page 
STAC9202 2-CHANNEL HIGH DEFINITION AUDIO CODEC WITH DUAL DIGITAL MICROPHONE INTERFACES PC AUDIO IDT™ 2-CHANNEL HIGH DEFINITION AUDIO CODEC WITH DUAL DIGITAL MICROPHONE INTERFACES 16 STAC9202 V 1.1 102606 IDT CONFIDENTIAL 3. DETAILED DESCRIPTION 3.1. SPDIF Input SPDIF_IN can operate at 44.1 KHz, 48 KHz or 96 KHz and implements internal Jack Sensing. A sophisticated digital PLL allows automatic rate detection and accurate data recovery. The ability to accept consumer SPDIF voltage levels directly eliminates the need for costly external receiver ICs. Advanced features such as record slot select and SPDIF_IN routing to the DAC allows for simulta- neous record and play. 3.2. SPDIF Output SPDIF_OUT can operate at 44.1 KHz, 48 KHz, 88.2 KHz and 96 KHz as defined in the Intel High Definition Audio Specification with resolutions up to 24 bits. This insures compatibility with all con- sumer audio gear and allows for convenient integration into home theater systems and media center PCs. 3.3. Digital Microphone Support The STAC9202 has a three-pin digital microphone interface that accepts high-rate, single-bit data streams from two digital microphones. Each microphone requires only one data line, and both micro- phones share a single clock line. This robust digital interface gives designers the flexibility to place the microphones in the optimum physical location on a system (such as along the top of the screen bezel) and use a simple, 3-wire ribbon cable to directly connect the microphones to the STAC9202 CODEC. 3.4. Mono Out The MONO Output is connected to pin 37 and has independent volume and mute control (see the Widget listing for details). The MONO Output derives its input from the output of the summing node that drives PORT A and PORT D. The following analog signals feed the summing amplifier that feeds the MONO Out summing amplifier: • DAC Output: When enabled, both DAC Outputs are summed together. • Analog PC BEEP: Source from Pin 12 • ADC Input: Stereo analog feed into the stereo ADC input. The signals of the stereo channels from the DAC are combined into a single analog signal with a -6dB degradation in signal strength. 3.5. Headphone Drivers Restrictions It is not recommended that users operate both Port A and Port D as headphone drivers simulta- neously. The operation of the two ports as headphone drivers degrades the signal quality of both outputs.1 Note: 1) Headphone capabilities are on Port A (pins 39/41) and Port D (pins 35/36). Do NOT put headphone loads on both sets of pins at the same time. |
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