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| 型号： | LT1397CDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURR FEEDBACK QUAD 14-DFN |
| 标准包装： | 91 |
| 放大器类型： | 电流反馈 |
| 电路数： | 4 |
| 转换速率： | 800 V/µs |
| -3db带宽： | 400MHz |
| 电流 - 输入偏压： | 10µA |
| 电压 - 输入偏移： | 1000µV |
| 电流 - 电源： | 4.6mA |
| 电流 - 输出 / 通道： | 80mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 12 V，±2 V ~ 6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 管件 |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1397CDE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single/Dual/Quad 400MHz Current Feedback Amplifier |
| LT1397CDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single/Dual/Quad 400MHz Current Feedback Amplifier |
| LT1397CGN | 功能描述:IC AMP CURR FEEDBACK QUAD 16SSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LT1397CGN#PBF | 功能描述:IC AMP CURR FEEDBACK QUAD 16SSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LT1397CGN#TR | 功能描述:IC AMP CURR FEEDBACK QUAD 16SSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
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