参数资料
| 型号： | AD811AN |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/21页 |
| 文件大小： | 0K |
| 描述： | IC CURR-FDBK AMP VIDEO HS 8-DIP |
| 标准包装： | 50 |
| 应用： | 电流反馈 |
| 电路数： | 1 |
| -3db带宽： | 140MHz |
| 转换速率： | 2500 V/µs |
| 电流 - 电源： | 16.5mA |
| 电流 - 输出 / 通道： | 100mA |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 18 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
AD811
Data Sheet
Rev. F | Page 16 of 20
A VIDEO KEYER CIRCUIT
a special form of a two-input VCA circuit called a video keyer
can be assembled. Keying is the term used in reference to blending
two or more video sources under the control of a third signal or
signals to create such special effects as dissolves and overlays.
The circuit shown in Figure 47 is a two-input keyer, with video
inputs VA and VB, and a control input VG. The transfer function
(with VOUT at the load) is given by
VOUT = GVA + (1 G)VB
where G is a dimensionless variable (actually, just the gain of the
A signal path) that ranges from 0 when VG = 0 to 1 when VG =
1 V. Thus, VOUT varies continuously between VA and VB as G
varies from 0 to 1.
Circuit operation is straightforward. Consider first the signal path
through U1, which handles video input VA. Its gain is clearly 0
when VG = 0, and the scaling chosen ensures that it has a unity
value when VG = 1 V; this takes care of the first term of the transfer
function. On the other hand, the VG input to U2 is taken to the
inverting input X2 while X1 is biased at an accurate 1 V. Thus,
when VG = 0, the response to video input VB is already at its
full-scale value of unity, whereas when VG = 1 V, the differential
input X1 X2 is 0. This generates the second term.
The bias currents required at the output of the multipliers are
provided by R8 and R9. A dc level-shifting network comprising
R10/R12 and R11/R13 ensures that the input nodes of the
AD811 are positioned at a voltage within its common-mode
range. At high frequencies, C1 and C2 bypass R10 and R11,
respectively. R14 is included to lower the HF loop gain and is
needed because the voltage-to-current conversion in the
AD834s, via the Y2 inputs, results in an effective value of the
feedback resistance of 250 ; this is only about half the value
required for optimum flatness in the AD811’s response. (Note
that this resistance is unaffected by G: when G = +1, all the
feedback is via U1, while when G = 0 it is all via U2). R14
reduces the fractional amount of output current from the
multipliers into the current-summing inverting input of the
AD811 by sharing it with R8. This resistor can be used to adjust
the bandwidth and damping factor to best suit the application.
Figure 47. A Practical Video Keyer Circuit
U3
AD811
7
6
4
3
2
+
–
X2
X1 +VS
W1
Y1
Y2
W2
–VS
U1
AD834
1
2
3
4
8
7
6
5
X2
X1 +VS
W1
Y1
Y2
W2
–VS
U1
AD834
1
2
3
4
8
7
6
5
R8
29.4
29.4
R9
R12
6.98k
6.98k
R13
R10
2.49k
C3
FB
VOUT
FB
VG
R6
226
R7
45.3
+5V
–5V
+5V
U4
AD589
R5
113
(0 TO +1V dc)
VA (±1V FS)
–5V
R4
1.02k
R3
100
R2
174
R1
1.87k
VB (±1V FS)
+5V
–5V
C1
0.1
F
0.1
F
0.1
F
0.1
F
R14
SEE TEXT
+5V
–5V
C4
C2
R11
2.49k
LOAD
GND
LOAD
GND
200
TO Y2
TO PIN 6
AD811
SETUP FOR DRIVING
REVERSE-TERMINATED LOAD
ZO
200
VOUT
INSET
00866-E-048
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD811AN | 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR |
| AD811ANZ | 功能描述:IC OPAMP VIDEO HP 8-DIP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:TFT-LCD 面板：VCOM 驱动器 输出类型:满摆幅 电路数:1 -3db带宽:35MHz 转换速率:40 V/µs 电流 - 电源:3.7mA 电流 - 输出 / 通道:1.3A 电压 - 电源，单路/双路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 供应商设备封装:8-uMax-EP 包装:管件 |
| AD811AR16 | 制造商:AD 功能描述:252-0381-020 制造商:Analog Devices 功能描述: |
| AD811AR-16 | 功能描述:IC CURR-FDBK AMP VIDEO HS 16SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| AD811AR-16-REEL | 功能描述:IC OPAMP VIDEO HP 16-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
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