参数资料
| 型号： | AD811JRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VIDEO HP 8SOIC |
| 标准包装： | 2,500 |
| 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： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
Data Sheet
AD811
Rev. F | Page 17 of 20
To generate the 1 V dc needed for the 1 G term, an AD589
reference supplies 1.225 V ± 25 mV to a voltage divider consisting
of resistors R2 through R4. Potentiometer R3 should be adjusted
to provide exactly 1 V at the X1 input.
In this case, an arrangement is shown using dual supplies of ±5 V
for both the AD834 and the AD811. Also, the overall gain is
arranged to be unity at the load when it is driven from a reverse-
terminated 75 line. This means that the dual VCA has to operate
at a maximum gain of +2, rather than +4 as in the VCA circuit
of Figure 46. However, this cannot be achieved by lowering the
feedback resistor because below a critical value (not much less
than 500 ) the peaking of the AD811 may be unacceptable.
This is because the dominant pole in the open-loop ac response
of a current feedback amplifier is controlled by this feedback
resistor. It would be possible to operate at a gain of ×4 and then
attenuate the signal at the output. Instead, the signals have been
attenuated by 6 dB at the input to the AD811; this is the
function of R8 through R11.
Figure 48 is a plot of the ac response of the feedback keyer when
driving a reverse-terminated 50 cable. Output noise and
adjacent channel feedthrough, with either channel fully off and
the other fully on, is about 50 dB to 10 MHz. The feedthrough
at 100 MHz is limited primarily by board layout. For VG = 1 V,
the 3 dB bandwidth is 15 MHz when using a 137 resistor for
R14 and 70 MHz with R14 = 49.9 . For more information on
the design and operation of the VCA and video keyer circuits,
Using the AD834 and AD811 by Brunner, Clarke, and Gilbert,
available on the Analog Devices, Inc. website at www.analog.com.
Figure 48. A Plot of the AC Response of the Video Keyer
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
CLOSED-LOOP
GAIN
(dB)
FREQUENCY (Hz)
100k
10k
1M
10M
100M
00866-E-049
R14 = 49.9
R14 = 137
GAIN
ADJACENT CHANNEL
FEEDTHROUGH
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD811JRZ-REEL7 | 功能描述:IC OPAMP VIDEO HP 8SOIC 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:- 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) |
| AD811SCHIPS | 制造商:AD 制造商全称:Analog Devices 功能描述:High Performance Video Op Amp |
| AD811SE | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD811SE/883B | 功能描述:视频放大器 OP-AMP HI-SPEED VIDEO RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel 安装风格: |
| AD811SQ/883B | 功能描述:视频放大器 OP-AMP HIGH SPEED VIDEO RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel 安装风格: |
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