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參數(shù)資料
| 型號(hào)： | GS1508-CTA |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HDTV Cable Driver |
| 中文描述： | 高清晰度電視電纜驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 115K |
| 代理商： | GS1508-CTA |
522 - 02 - 03
5
G
Fig. 5 Static Protection Diodes
OUTPUT RETURN LOSS MEASUREMENT
To perform a practical return loss measurement, it is
necessary to force the GS1508 output to a DC high or low
condition. The actual measured return loss will be based on
the outputs being static at V
CC
or V
CC
-1.6V. Under normal
operating conditions the outputs of the GS1508 swing
between V
CC
-0.4V and V
CC
-1.2V, so the measured value of
return loss will not represent the actual operating return
loss.
A simple method of calculating the values of actual
operating return loss is to interpolate the two return loss
measurements. In this way, the values of return loss are
estimated at V
CC
-0.4V and V
CC
-1.2V based on the
measurements at V
CC
and V
CC
-1.6V.
The two values of return loss (high and low) will typically
differ by several decibels. If the measured return loss is R
H
for logic high and R
L
for logic low, then the two values can
be interpolated as follows:
R
IH
= R
H
- (R
H
-R
L
)/4 and
R
IL
= R
L
+(R
H
-R
L
)/4
where R
IH
is the interpolated logic high value and R
IL
is the
interpolated logic low value.
For example, if R
H
= -18dB and R
L
= -14dB, then the
interpolated values are R
IH
= -17dB and R
IL
= -15dB.
OUTPUT AMPLITUDE ADJUSTMENT
The output amplitude of the GS1508 can be adjusted by
changing the value of the R
SET
resistor as shown in Figure 6
and Table 1. For an 800mV
p-p
output with a nominal ±7%
tolerance, a value of 53.6% is required. A ±1% SMT resistor
should be used.
The R
SET
resistor is part of the high speed output circuit of
the GS1508. The resistor should be placed as close as
possible to the R
SET
pin. In addition, PCB capacitance
should be minimized at this node by removing the PCB
groundplane beneath the R
SET
resistor and the R
SET
pin.
Fig. 6 GS1508 Output Amplitude vs. 1/R
SET
NOTE: For reliable operation of the GS1508 over the full
temperature range, do not use an R
SET
value below 49.9
.
SDO
SDO
GS1508
TABLE 1: R
SET
vs V
OUT
R
SET
R
1/R
SET
OUTPUT SWING
500.0
0.0020
0.095
150.0
0.0067
0.298
75.0
0.0133
0.575
53.6
0.0187
0.785
43.2
0.0231
0.937
1.000
0.800
0.600
0.400
0.200
0.000
0.0000 0.0050 0.0100 0.0150 0.0200 0.0250
1 / R
SET
(mho)
O
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PDF描述 |
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| GS1510 | HDTV Serial Digital Deformatter |
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| GS1522 | HDTV Serial Digital Serializer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS1508-CTAE3 | 制造商:Semtech Corporation 功能描述:HD Cable Driver |
| GS-150N | 制造商:Taiyo Electric Ind. 功能描述: |
| GS150TA_25104 | 制造商:IXYS Corporation 功能描述:DIODE GAAS SCHOTTKY DE150 |
| GS150TA25104 | 制造商:IXYS 制造商全稱(chēng):IXYS Corporation 功能描述:Gallium Arsenide Schottky Rectifier |
| GS150TA25110 | 制造商:IXYS 制造商全稱(chēng):IXYS Corporation 功能描述:Gallium Arsenide Schottky Rectifier |
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