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| 型號(hào)： | LT1395CS5#TRMPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC AMP CURR FEEDBK SNGL TSOT23-5 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類(lèi)型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 800 V/µs |
| -3db帶寬： | 400MHz |
| 電流 - 輸入偏壓： | 10µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 4.6mA |
| 電流 - 輸出 / 通道： | 80mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 12 V，±2 V ~ 6 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-5 細(xì)型，TSOT-23-5 |
| 供應(yīng)商設(shè)備封裝： | TSOT-23-5 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 1318 (CN2011-ZH PDF) |
| 其它名稱(chēng)： | LT1395CS5#TRMPBFDKR |
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LT1395/LT1396/LT1397
12
139567fd
input impedance when considered in parallel with R10.
R10 also connects to the inverting input of amplier A2,
adding the B contribution to the Y signal as discussed
above. Amplier A4 is congured in a noninverting gain
of 2 conguration with the bottom of the gain resistor
R4 tied to the Y output. The output of amplier A4 thus
results in the color-difference output B-Y.
The G input also arrives via 75Ω coax and adds its con-
tribution to the Y signal via a 432Ω resistor R9, which is
tied to the inverting input of amplier A2. There is also
a 90.9Ω termination resistor R12, which yields a 75Ω
termination when considered in parallel with R9. Using
superposition, it is straightforward to determine the
output of amplier A2. Although inverted, it sums the
R, G and B signals in the standard proportions of 0.3R,
0.59G and 0.11B that are used to create the Y signal.
Amplier A3 then inverts and amplies the signal by 2,
resulting in the Y output.
Buffered Color-Difference to RGB Matrix
An LT1395 combined with an LT1396 can be used to cre-
ate buffered RGB outputs from color-difference signals
(Figure 5). The R output is a back-terminated 75Ω signal
created using resistor R5 and amplier A1 congured for
a gain of +4 via resistors R3 and R4. The noninverting
input of amplier A1 is connected via 1k resistors R1
and R2 to the Y and R-Y inputs respectively, resulting
in cancellation of the Y signal at the amplier input. The
remaining R signal is then amplied by A1.
The B output is also a back-terminated 75Ω signal cre-
ated using resistor R16 and amplier A3 congured for
a gain of +4 via resistors R14 and R15. The noninverting
input of amplier A3 is connected via 1k resistors R12
and R13 to the Y and B-Y inputs respectively, resulting
in cancellation of the Y signal at the amplier input. The
remaining B signal is then amplied by A3.
The G output is the most complicated of the three. It is a
weighted sum of the Y, R-Y and B-Y inputs. The Y input
is attenuated via resistors R6 and R7 such that amplier
A2’s noninverting input sees 0.83Y. Using superposition,
we can calculate the positive gain of A2 by assuming that
APPLICATIONS INFORMATION
Figure 5. Buffered Color-Difference to RGB Matrix
–
+
A2
LT1395
R7
1k
B-Y
R-Y
Y
R10
267Ω
R11
75Ω
R6
205Ω
R2
1k
R1
1k
R8
261Ω
R9
698Ω
–
+
A3
1/2 LT1396
R14
267Ω
B
G
R16
75Ω
R12
1k
R13
1k
R15
88.7Ω
ALL RESISTORS 1%
VS = ±5V
–
+
A1
1/2 LT1396
R3
267Ω
R
R5
75Ω
R4
88.7Ω
1395/6/7 F05
R8 and R9 are grounded. This results in a gain of 2.41
and a contribution at the output of A2 of 2Y. The R-Y input
is amplied by A2 with the gain set by resistors R8 and
R10, giving an amplication of –1.02. This results in a
contribution at the output of A2 of 1.02Y – 1.02R. The B-Y
input is amplied by A2 with the gain set by resistors R9
and R10, giving an amplication of – 0.37. This results in
a contribution at the output of A2 of 0.37Y – 0.37B.
If we now sum the three contributions at the output of
A2, we get:
A2OUT = 3.40Y – 1.02R – 0.37B
It is important to remember though that Y is a weighted
sum of R, G and B such that:
Y = 0.3R + 0.59G + 0.11B
If we substitute for Y at the output of A2 we then get:
A2OUT = (1.02R – 1.02R) + 2G + (0.37B – 0.37B)
= 2G
The back-termination resistor R11 then halves the output
of A2 resulting in the G output.
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