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參數(shù)資料
| 型號： | LT1399CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 20-PDIP 0 to 70 |
| 中文描述： | TRIPLE OP-AMP, 12000 uV OFFSET-MAX, 300 MHz BAND WIDTH, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 229K |
| 代理商： | LT1399CS |
12
LT1398/LT1399/LT1399HV
U
S
A
O
PPLICATI
U
U
Buffered RGB to Color-Difference Matrix
Two LT1398s can be used to create buffered color-
difference signals from RGB inputs (Figure 8). In this
application, the R input arrives via 75
coax. It is routed
to the noninverting input of LT1398 amplifier A1 and to
a 1082
resistor R8. There is also an 80.6
termination
–
+
A2
1/2 LT1398
–
+
B1
1/2 LT1398
–
+
A1
1/2 LT1398
R7
324
R6
162
R5
324
R10
2940
R9
549
R11
80.6
R
G
B
R12
86.6
R13
76.8
ALL RESISTORS 1%
V
S
=
±
5V
R8
1082
75
SOURCES
R1
324
R2
324
R4
324
R3
324
B-Y
Y
R-Y
1398/99 F08
–
+
B2
1/2 LT1398
resistor R11, which yields a 75
input impedance at the
R input when considered in parallel with R8. R8 connects
to the inverting input of a second LT1398 amplifier (A2),
which also sums the weighted G and B inputs to create a
–0.5 Y output. LT1398 amplifier B1 then takes the
–0.5 Y output and amplifies it by a gain of –2, resulting
in the Y output. Amplifier A1 is configured in a noninvert-
ing gain of 2 with the bottom of the gain resistor R2 tied
to the Y output. The output of amplifier A1 thus results in
the color-difference output R-Y.
The B input is similar to the R input. It arrives via 75
coax, and is routed to the noninverting input of LT1398
amplifier B2, and to a 2940
resistor R10. There is also
a 76.8
termination resistor R13, which yields a 75
input impedance when considered in parallel with R10.
R10 also connects to the inverting input of amplifier A2,
adding the B contribution to the Y signal as discussed
above. Amplifier B2 is configured in a noninverting gain
of 2 configuration with the bottom of the gain resistor R4
tied to the Y output. The output of amplifier B2 thus
results in the color-difference output B-Y.
Figure 7. LT1399HV Output Voltage Swing
V
IN
V
OUT
V
S
=
±
7.5V
R
F
= 324
R
G
= 162
R
S
= 16.9
C
L
= 330pF
50ns/DIV
1398/99 F07
Figure 8. Buffered RGB to Color-Difference Matrix
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