bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 60

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

50
2.0 Electrical Interfaces
2.1 Input Interface
2.1.8 Crystal Inputs and Clock Generation
The Bt829B has two pairs of pins: XT0I/XT0O and XT1I/XT1O. They are used
to input a clock source. If both NTSC and PAL video are being digitized, both
clock inputs must be implemented. The XT0 port is used to decode NTSC video
and must be configured with a 28.63636 MHz source. The XT1 port is used to
decode PAL video and must be configured with a 35.46895 MHz source.
only one clock source must be provided to the chip and it must be connected to
the XT0I/XT0O port. If a crystal input is not used, the crystal amplifiers are
internally shut down to save power.
damental cut crystals, or third overtone mode crystals, with parallel resonant. If
single-ended oscillators are used, they must be connected to XT0I and XT1I.
Figure 2-3 shows the clock source options and circuit requirements.
If the Bt829B is configured to decode either NTSC or PAL, but not both, then
Crystals are specified as follows:
• 28.636363 MHz or 35.468950 MHz
• Third overtone
• Parallel resonant
• 30 pF load capacitance
• 50 ppm
• Series resistance 40
The following crystals are recommended for use with the Bt829B:
1
2
3
4
5
6
The two clock sources may be configured using single-ended oscillators, fun-
Standard Crystal
[phone]
2BAK28M636363GLE30A
2BAK35M468950GLE30A
GED
[phone]
PKHC49-28.63636-.030-005-40R, 3rd overtone crystal
PKHC49-35.46895-.030-005-40R, 3rd overtone crystal
M-Tron
[phone]
MP-1 28.63636, 3rd overtone crystal
MP-1 35.46895, 3rd overtone crystal
Monitor
[phone]
MM49X3C3A-28.63636, 3rd overtone crystal
MM49X3C3A-35.46895, 3rd overtone crystal
CTS
[phone]
R3B55A30-28.63636, 3rd overtone crystal
R3B55A30-35.46895, 3rd overtone crystal
Fox
[phone]
HC49U-28.63636, 3rd overtone crystal
HC49U-35.46895, 3rd overtone crystal
D829BDSA
or less
VideoStream II Decoders
Bt829B/827B