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參數(shù)資料
| 型號： | GS9068-CKAE3 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SD SDI Cable Driver |
| 中文描述： | 標清SDI電纜驅(qū)動器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 116K |
| 代理商： | GS9068-CKAE3 |
GENNUM CORPORATION
22213 - 2
6 of 8
G
3.4 OUTPUT AMPLITUDE ADJUSTMENT
The output amplitude of the GS9068 can be adjusted by
changing the value of the R
SET
resistor as shown in Figure 2
and Table 1 below. For an 800mV
p-p
output with a nominal
±7% tolerance, a value of 750
is required. A ±1% SMT
resistor should be used.
Fig. 2 Output Amplitude Adjustment
The R
SET
resistor is part of the high speed output circuit of
the GS9068. The resistor should be placed as close as
possible to the R
SET
pin. In addition, the PCB capacitance
should be minimized at this node by removing the PCB
groundplane beneath the R
SET
resistor and the R
SET
pin.
NOTE: For reliable operation of the GS9068 over the full
temperature range, do not use an R
SET
value below 573
.
4. APPLICATION REFERENCE DESIGN
4.1 PCB LAYOUT
An FR-4 dielectric can be used, however, controlled
impedance transmission lines are required for PCB traces
longer than approximately 1cm. Note the following PCB
artwork features used to optimize performance:
The PCB groundplane is removed under the GS9068
output components to minimize parasitic capacitance.
The PCB ground plane is removed under the GS9068
R
SET
pin and resistor to minimize parasitic capacitance.
Input and output BNC connectors are surface mounted
in-line to eliminate a transmission line stub caused by a
BNC mounting via high speed traces which are curved
to minimize impedance variations due to change of PCB
trace width.
4.2 TYPICAL APPLICATION CIRCUIT
1100
1000
900
800
700
700 800 900 1000
R
SET
(
)
O
600
600
500
Table 1: R
SET
vs V
OD
R
SET
(
)
OUTPUT SWING
995
608mV
824
734mV
750
800mV
600
884mV
573
1040mV
GS9068
1
2
3
4
8
7
6
5
SDI
SDI
VEE
RSET
SDO
SDO
NC
VCC
10n
75
5.6n
4u7
BNC
VCC
75
5.6n
10n
75
4u7
49.9
750
10n
49.9
4u7
75
BNC
VCC
4u7
VCC
*
TYPICAL VALUE VARIES WITH LAYOUT
DIFFERENTIAL
DATA INPUT
*
*
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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