ADV3201 AD [Analog Devices], ADV3201 Datasheet - Page 35

• Manufacturer Part Number: ADV3201
• Manufacturer: AD [Analog Devices]

If multiple ADV3200/ADV3201s are to be driven in parallel, a
fly-by input termination scheme is very useful, but the distance
from each ADV3200/ADV3201 input to the driven input
Figure 106. Fly-By Input Termination (Grounds for the Two Transmission
BNC
SMA
RCA
RCA
[CLK, DATA IN, DATA OUT,
FROM PC
UPDATE, CS, RESET]
Lines Must Be Tied Together Close to the INxx Pin)
75Ω
75Ω
75Ω
75Ω
50Ω
100nF
75Ω
75Ω
75Ω
50Ω
USB DIGITAL
CONTROL
INxx
PADS FOR
OSDS[31:0] TO HIGH SPEED
VCLAMP
75Ω
10nF
6
CAPS
0402
0402
0402
0402
ADV3200/
ADV3201
CLK, DATA IN, DATA OUT,
UPDATE, CS, RESET
IN[2:0], OSD[24:22], OSD[18:16]
IN[5:3], OSD[21:19]
OSD[27:25]
IN[8:6], OSD[30:28]
IN[31:9], OSD[31], OSD[15:0]
1nF
BREAKOUT
TEST POINT
OUTxx
VPOS VNEG DVCC DGND
VCLAMP OSDS[31:0]
Figure 107. Evaluation Board Simplified Schematic
ADV3200/ADV3201
1kΩ
OSDS[24:22]
2kΩ
Rev. 0 | Page 35 of 36
TEST POINT
OSDS[18:16]
VREF
OUT[31], OUT[15:0]
TEST POINT
BNC
OUT[18:16]
OUT[21:19]
OUT[24:22]
OUT[27:25]
OUT[30:28]
transmission line is a stub that should be minimized in length
and parasitics using the discussed guidelines.
Although the examples discussed so far are for input termination,
the theory is similar for output back termination. Taking the
ADV3200/ADV3201 as an ideal voltage source, any distance of
routing between the ADV3200/ADV3201 and a back-termination
resistor is a stub that creates reflections. For this reason, place
back-termination resistors close to the ADV3200/ADV3201. In
practice, because back-termination resistors are series elements,
their footprint in the routing is narrower, and it is easier to place
them close to the ADV3200/ ADV3201 outputs in board layout.
100nF
75Ω
150Ω
150Ω
10nF
75Ω
75Ω
TEST POINT
OUT[15:0]
464Ω
464Ω
86.6Ω
AD8003
AD8003
75Ω
75Ω
43Ω
1nF
464Ω
464Ω
75Ω
75Ω
50Ω
ADV3200/ADV3201
75Ω
75Ω
BNC
RCA
BNC
RCA
SMA