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STAC9767 Datasheet(PDF) 14 Page - Integrated Device Technology |
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STAC9767 Datasheet(HTML) 14 Page - Integrated Device Technology |
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14 / 97 page  STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO IDT™ 14 STAC9766/9767 V 7.4 12/06 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 2.2.3. Clocks Figure 4. Clocks Timing 2.2.4. STAC9766/9767 Crystal Elimination Circuit and Clock Frequencies The STAC9766/9767 supports several clock frequency inputs as described in the following table. In general, when a 24.576 MHz xtal is not used, the XTALOUT pin should be tied to ground. This short to ground configures the part into an alternate clock mode and enables an on board PLL. CODEC Modes: P = The STAC9766/9767 as a Primary CODEC S = The STAC9766/9767 as a Secondary CODEC. Parameter Symbol Min Typ Max Units BIT_CLK frequency - 12.288 - MHz BIT_CLK period Tclk_period - 81.4 - ns BIT_CLK output jitter - 750 - ps BLT_CLK high pulse width (Note 1) Tclk_high 36 40.7 45 ns BIT_CLK low pulse width (Note 1) Tclk_low 36 40.7 45 ns SYNC frequency - 48.0 - KHz SYNC period Tsync_period - 20.8 - µs SYNC high pulse width Tsync_high - 1.3 - µs SYNC low pulse width Tsync_low - 19.5 - µs Note: 1. Worst case duty cycle restricted to 45/55. Table 1. Clock Mode Configuration XTL_OUT Pin Config CID1 Pin Config CID0 Pin Config Clock Source Input CODEC Mode CODEC D XTAL float float 24.576MHz crystal P 0 XTAL or open float pulldown 12.288 MHz BIT_CLK S 1 XTAL or open pulldown float 12.288 MHz BIT_CLK S 2 XTAL or open pulldown pulldown 12.288 MHz BIT_CLK S 3 short to ground float float 14.31818 MHz source P 0 short to ground float pulldown 27 MHz source P 0 short to ground pulldown float 48 MHz source P 0 short to ground pulldown pulldown 24.576 MHz source P 0 SYNC BIT_CLK Tclk_high Tclk_low Tclk_period Tsync_high Tsync_period Tsync_low |
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