GS4911B_09 Datasheet, PDF (36/119 Pages) Gennum Corporation – HD/SD/Graphics Clock and Timing Generator with GENLOCK

PCLK
tOH
tOD
50%
TIMING_OUT
VOH
VOL
VOH
VOL
Figure 2-1: PCLK to TIMING_OUT Signal Output Timing
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 37.
GS4911B/GS4910B HD/SD/Graphics Clock and Timing
Generator with GENLOCK
Data Sheet
36655 - 5
June 2009
36 of 119