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GS2970A Datasheet(PDF) 32 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 32 Page - Semtech Corporation |
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32 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 32 of 150 4.6 External Crystal/Reference Clock The GS2970A requires an external 27MHz reference clock for correct operation. This reference clock is generated by connecting a crystal to the XTAL1 and XTAL2 pins of the device. See Application Reference Design on page 145. Table 4-3 shows XTAL characteristics. Alternately, a 27MHz external clock source can be connected to the XTAL1 pin of the device, as shown in Figure 4-3. The frequency variation of the crystal including aging, supply and temperature variation, should be less than +/-100ppm. The equivalent series resistance (or motional resistance) should be a maximum of 50 Ω. The external crystal is used in the frequency acquisition process. It has no impact on the output jitter performance of the part when the part is locked to incoming data. Because of this, the only key parameter is the frequency variation of the crystal that is stated above. Table 4-2:PLL Loop Bandwidth Input Data Rate LB_CONT Pin Connection Loop Bandwidth (MHz)1 SD 3.3V 0.135 Floating 0.27 0V 0.54 HD 3.3V 0.75 Floating 1.5 0V 3.0 3G 3.3V 1.5 Floating 3.0 0V 6.0 1Measured with 0.2UI input jitter applied |
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Similar Description - GS2970A |
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