GS4901B_09 Datasheet, PDF (32/102 Pages) Gennum Corporation – SD Clock and Timing Generator with GENLOCK

Table 2-3: Suggested External Crystal Specification
27.000000 MHz
AT Cut
Nominal Dissipation = 50 uW
Frequency accuracy at 25°C = +/- 10ppm
Frequency variation 0-70°C = +/- 10ppm
ASR = 50 +/- 20Ω
NOTE: The user may select an appropriate crystal accuracy for their application. If the device is
operating in Free Run mode, the output clock and timing signals will have the same accuracy
as the crystal. However, if operating in Genlock mode, all output signals are based on the
input reference, and therefore a less accurate crystal may be sufficient. See Section 3.2 on
page 35.
GS4901B/GS4900B SD Clock and Timing Generator
with GENLOCK
Data Sheet
37703 - 4
December 2009
32 of 102