参数资料
| 型号： | AD811JR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC CURR-FDBK AMP VIDEO HS 8-SOIC |
| 标准包装： | 98 |
| 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： | 管件 |
Data Sheet
AD811
Rev. F | Page 15 of 20
AN 80 MHZ VOLTAGE-CONTROLLED AMPLIFIER
CIRCUIT
The voltage-controlled amplifier (VCA) circuit of Figure 46 shows
multiplier. The AD834 multiplies the signal input by the dc control
currents from a pair of open collectors, ensuring that the full
bandwidth of the multiplier (which exceeds 500 MHz) is
available for certain applications. Here, the AD811 op amp
provides a buffered, single-ended, ground-referenced output.
Using feedback resistors R8 and R9 of 511 , the overall gain
ranges from 70 dB for VG = 0 V to +12 V (a numerical gain of
+4) when VG = 1 V. The overall transfer function of the VCA is
VOUT = 4 (X1 X2)(Y1 Y2), which reduces to VOUT = 4 VG VIN
using the labeling conventions shown in Figure 46. The circuit’s
3 dB bandwidth of 80 MHz is maintained essentially constant—
that is, independent of gain. The response can be maintained
flat to within ±0.1 dB from dc to 40 MHz at full gain with the
addition of an optional capacitor of about 0.3 pF across the
feedback resistor R8. The circuit produces a full-scale output of
±4 V for a ±1 V input and can drive a reverse-terminated load
of 50 or 75 to ±2 V.
The gain can be increased to 20 dB (×10) by raising R8 and R9
to 1.27 k, with a corresponding decrease in 3 dB bandwidth
to approximately 25 MHz. The maximum output voltage under
these conditions is increased to ±9 V using ±12 V supplies.
The gain-control input voltage, VG, may be a positive or negative
ground-referenced voltage, or fully differential, depending on
the choice of connections at Pin 7 and Pin 8. A positive value of
VG results in an overall noninverting response. Reversing the sign
of VG simply causes the sign of the overall response to invert. In
fact, although this circuit has been classified as a voltage-controlled
amplifier, it is also quite useful as a general-purpose, four-quadrant
multiplier, with good load driving capabilities and fully
symmetrical responses from the X and Y inputs.
The AD811 and AD834 can both be operated from power supply
voltages of ±5 V. While it is not necessary to power them from
the same supplies, the common-mode voltage at W1 and W2
must be biased within the common-mode range of the input
stage of the AD811. To achieve the lowest differential gain and
phase errors, it is recommended that the AD811 be operated
from power supply voltages of ±10 V or greater. This VCA
circuit operates from a ±12 V dual power supply.
Figure 46. An 80 MHz Voltage-Controlled Amplifier
X2
X1 +VS
W1
Y1
Y2
W2
–VS
U1
AD834
U3
AD811
R4
182
R5
182
R1 100
R2 100
R3
249
R6
294
R7
294
R9*
R8*
RL
FB
C2
0.1
F
C1
0.1
F
–12V
VOUT
FB
+12V
VG
VIN
*R8 = R9 = 511
FOR ×4 GAIN
R8 = R9 = 1.27k
FOR ×10 GAIN
+
–
1
2
3
4
8
7
6
5
7
6
4
3
2
+
–
00866-E-047
相关PDF资料 |
PDF描述 |
|---|---|
| VI-JVT-MZ-B1 | CONVERTER MOD DC/DC 6.5V 25W |
| VE-BN4-MU-F4 | CONVERTER MOD DC/DC 48V 200W |
| VI-J5M-MZ-B1 | CONVERTER MOD DC/DC 10V 25W |
| VE-BN4-MU-F3 | CONVERTER MOD DC/DC 48V 200W |
| VI-JVR-MZ-B1 | CONVERTER MOD DC/DC 7.5V 25W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD811JR-EBZ | 功能描述:BOARD EVAL FOR AD811JR RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| AD811JR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk ±18V 8-Pin SOIC N T/R |
| AD811JR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk ±18V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:IC, HIGH SPEED OP AMP IC - Tape and Reel |
| AD811JRZ | 功能描述:IC OPAMP VIDEO HP 8-SOIC 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 |
| AD811JRZ-REEL | 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) |
发布紧急采购，3分钟左右您将得到回复。