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參數資料
| 型號： | AD8005AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 270 MHz, 400 uA Current Feedback Amplifier |
| 中文描述： | OP-AMP, 50000 uV OFFSET-MAX, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數： | 11/12頁 |
| 文件大小： | 183K |
| 代理商： | AD8005AR-REEL |
AD8005
–11–
REV. A
Increasing Feedback Resistors
Unlike conventional voltage feedback op amps, the choice of feed-
back resistor has a direct impact on the closed-loop bandwidth
and stability of a current feedback op amp circuit. Reducing the
resistance below the recommended value makes the amplifier
more unstable. Increasing the size of the feedback resistor
reduces the closed-loop bandwidth.
V
OUT
2V (rms)
+5V
562
V
4.99k
V
–5V
AD8005
V
IN
0.2V (rms)
QUIESCENT CURRENT
475
m
A (MAX)
360
m
A (rms)
Figure 33. Saving Power by Increasing Feedback Resistor
Network
In power-critical applications where some bandwidth can be
sacrificed, increasing the size of the feedback resistor will yield
significant power savings. A good example of this is the gain of
+10 case. Operating from a bipolar supply (
±
5 V), the quiescent
current is 475
μ
A (excluding the feedback network). The recom-
mended feedback and gain resistors are 499
and 56.2
respectively. In order to drive an rms output voltage of 2 V, the
output must deliver a current of 3.6 mA to the feedback net-
work. Increasing the size of the resistor network by a factor of
10 as shown in Figure 33 will reduce this current to 360
μ
A.
The closed loop bandwidth will however decrease to 20 MHz.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8005AR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk 制造商:Rochester Electronics LLC 功能描述:SOIC 180MHZ,400UA CURRENT FEEDBACK AMP - Tape and Reel |
| AD8005ART-EBZ | 功能描述:BOARD EVAL FOR AD8005ART RoHS:是 類別:編程器，開發系統 >> 評估板 - 運算放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| AD8005ART-R2 | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk |
| AD8005ART-REEL | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk |
| AD8005ART-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk 制造商:Rochester Electronics LLC 功能描述:SOT23 180MHZ,400UA CURRENT FEEDBACK AMP - Tape and Reel |
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