STAC9752 datasheet(45/95 Pages) IDT

45 / 95 page

STAC9752/9753

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

IDT™

STAC9752/9753

REV 3.3 1206

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

7.1.

Analog Mixer Input

The mixer provides recording and playback of any audio sources or output mix of all sources. The

STAC9752/9753 supports the following input sources:

•

any mono or stereo source

•

mono or stereo mix of all sources

•

2-channel input w/mono output reference (microphone or stereo mix)

Note: All unused inputs should be tied together and connected to ground through a capacitor (0.1

µF

suggested).

Note: The MIC should be tied to ground through a separate 0.1

µF capacitor.

7.2.

Mixer Analog Output

The mixer generates three distinct outputs:

•

A stereo mix of all sources for output to the LINE_OUT

•

A stereo mix of all sources for output to HP_OUT

•

A mono, microphone only, or mix of all sources, for MONO_OUT

7.3.

SPDIF Digital Mux

The STAC9752/9753 incorporates a digital output that supports SPDIF formats. A multiplexer deter-

mines which of two digital input streams are used for the digital output conversion process. These

two streams include the PCM_OUT data from the audio controller and the ADC recorded output. The

normal analog LINE_OUT signal can be converted to the SPDIF formats by using the internal ADC

to record the “MIX” output, which is the combination of all analog and all digital sources. In the case

of digital controllers with support for 4 or more channels, the SPDIF output mode can be used to

support compressed 6-channel output streams for delivery to home theater systems. These can be

routed on alternate AC-Link slots to the SPDIF output, while the standard 2-channel output is deliv-

ered as selected by bits D5 and D4 in Register 6E. If the digital controller supports 6 channels, a

SPDIF output with 4 analog channels can also be configured.

If the Digital Controller has independent DMA engines, SPDIF and Analog can be used simulta-

neously and independently.

Pin 48: To Enable SPDIF, use an 1 K

Ω to 10 K Ω external pulldown. To Disable SPDIF, use an 1 KΩ

to 10 K

Ω external pullup. Do NOT leave Pin 48 floating.

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