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GS2970A Datasheet(PDF) 32 Page - Semtech Corporation

Part # GS2970A
Description  3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS2970A Datasheet(HTML) 32 Page - Semtech Corporation

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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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