Data Sheet

VFCG-HD1
Synchronous Clock Generator
For HD and SD Video Broadcast
Features
¾ Low Jitter HD and SD Clock Sources
¾ Completely Integrated Timing Solution
RoHS Status
Applications
¾ SMPTE 274 Systems
¾ SMPTE 296 Systems
¾ SMPTE 424 3Gb/s re-clocking
¾ NTSC
¾ PAL
Description:
The VFCG-HD-1 is a fully integrated video clock generator which provides synchronous High
Definition (HD) and Standard Definition (SD) output clocks for the various scanning formats.
The device synchronizes to the standard input reference clock required by SMPTE274, SMPTE296,
NTSC or PAL systems. A 5-bit address is used to synchronize the generator to the appropriate input
reference clock. A dedicated control signal divides the maximum HD clock rate by 2 in order to
support HD clock rates of 74.25 MHz and 74.1758 MHz.
LD
Ref Clk out
SMPTE424
Reference
Clock
Control
Logic
SMPTE 274
SMPTE 296
27 MHz
PLL
SD
Clock
NTSC
PAL
µC
Video
Format
Select
5
148.3516 MHz
&
148.5000 MHz
PLL
S4
S3
S2
S1
S0
÷2
Mux
HD
Clock
÷ 2 Select
Block Diagram
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com
•
RevF1208
VFCG-HD1
Synchronous Clock Generator
For HD and SD Video Broadcast
Absolute Maximum Ratings
Parameter
Supply Break Down
Voltage
Storage
Temperature
Symbol
Condition
Min
Typ
Max
Unit
Vcc
-0.5
4.6
V
Ts
-55
+105°
°C
Note
Operating Specification
Parameter
Symbol
HD-out
Output Frequency
Condition
Min
÷2 sel = “0”
÷2 sel = “1”
148.3516
74.17582
SD_out
Typ
Max
Unit
Note
148.500
74.250
MHz
See Table 1
MHz
See Table 1
See Table 1
Falling edge
triggered
27.00
Input Frequency
Fin
15.625
10,000.0
KHz
Input Level
Vin
2.2
3.3
V p-p
Output Level Logic
“1”
Output Level Logic
“0”
Phase Jitter
Peak to Peak Jitter
Input Tracking
Range
Modulation BW
Voh
IOH = 8 mA
Vcc-.6
Vcc
V
LVCMOS
Vol
IOL = 8 mA
0.0
.3
V
LVCMOS
1
2
ps(rms)
7
10
ps
ppm
10
Hz
MBW
@ 50%
Duty Cycle
Rise / Fall Time
± 50
Tr/Tf
45
20% to 80%
50
.6
Initial Lock time
Supply Voltage
Vcc
Input Current
Operating
Temperature
Range
Icc
Lock Detect
LD
÷ 2 Sel input
÷ 2 Sel
Ta
55
3.15
3.30
60
-40°
%
ns
4
s
3.45
V
80
mA
+85°
°C
Output HIGH (> 2.5 V) : In Lock; Output LOW (< .5V): Out of
Lock
Logic “0” : HD_out = 148 MHz;
Logic “1” or floating HD_out = 74 MHz
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com
LVCMOS
LVCMOS
•
RevF1208
VFCG-HD1
Synchronous Clock Generator
For HD and SD Video Broadcast
Table 1
I/O Select (HEX)
00
01
02
03
04
05
06
07
08
09
Input Ref (KHz)
67.5
56.25
33.75
28.125
27
45
37.5
22.5
18.75
18
HD output (MHz)
148.50
148.50
148.50
148.50
148.50
148.50
148.50
148.50
148.50
148.50
SD/HD ratio
4/22
4/22
4/22
4/22
4/22
4/22
4/22
4/22
4/22
4/22
SD output (MHz)
27
27
27
27
27
27
27
27
27
27
0A
0B
0C
0D
0E
0F
67.43257
33.71628
26.97303
44.95504
22.47752
17.98202
148.3516484
148.3516484
148.3516484
148.3516484
148.3516484
148.3516484
91/500
91/500
91/500
91/500
91/500
91/500
27
27
27
27
27
27
10
11
12
13
14
15
16
17
15.73427
15.73427
15.625
15.625
10,000.0
10,000.0
74,175.8242
74,250.00
148.50
148.3516484
148.50
148.3516484
148.50
148.3516484
148.50
148.3516484
4/22
91/500
4/22
91/500
27
27
27
27
27
27
27
27
Pin Assignments
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Symbol
Fref-out
Fref-in
S0
Vccp
Vcc
S1
S2
S4
S3
Gnd
Gnd
TP2
HD_out
÷ 2 Sel
Vcc
SD_out
Gnd
LD
Gnd
TP1
Gnd
Gnd
Description
Reference Clock Output
Reference Clock Input
I/O Select (LSB)
+3.3V Power Supply
+3.3V Power Supply
I/O Select
I/O Select
I/O Select (MSB)
I/O Select
Ground
Ground
Test Pt
High Definition Clk Outout
Divide by 2 Select
+3.3V Power Supply
Standard Definition Clk Output
Ground
Lock Detect
Ground
Test Pt
Ground
Ground
Notes
Inverts Fref-in
Connect to pin #5 and add .1 uF Cap
Connect to pin #4 and add .1 uF Cap
Do not Connect
Divides the HD_out clk by 2
Do not Connect
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com
•
RevF1208
VFCG-HD1
Synchronous Clock Generator
For HD and SD Video Broadcast
Mechanical Outline
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com
•
RevF1208
VFCG-HD1
Synchronous Clock Generator
For HD and SD Video Broadcast
Recommended Pad Layout
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com
•
RevF1208
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