參數(shù)資料
型號： CLC5665IMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 運(yùn)動控制電子
英文描述： Low Distortion Amplifier with Disable
中文描述： OP-AMP, 10000 uV OFFSET-MAX, 90 MHz BAND WIDTH, PDSO8
封裝： PLASTIC, SOIC-8
文件頁數(shù)： 4/8頁
文件大?。?/td> 120K
代理商： CLC5665IMX
http://www.national.com
4
The CLC5665 is a general purpose current-feedback
amplifier for use in a variety of small- and large-signal
applications. Use the feedback resistor to fine tune the
gain flatness and -3dB bandwidth for any gain setting.
National provides information for the performance at a
gain of +2 for small and large signal bandwidths. The
plots show feedback resistor values for selected gains.
Gain
Use the following equations to set the CLC5665’s non-
inverting or inverting gain:
Choose the resistor values for non-inverting or inverting
gain by the following steps.
Figure 1: Component Identification
1) Select the recommended feedback resistor R
f
.
2) Choose the value of R
g
to set gain.
3) Select R
s
to set the circuit output impedance.
4) Select R
in
for input impedance and input bias.
High Gains
Current feedback closed-loop bandwidth is independent
of gain-bandwidth-product for small gain changes. For
larger gain changes the optimum feedback register R
f
is
derived by the following:
R
f
= 724
– 60
(A
v
)
As gain is increased, the feedback resistor allows band-
width to be held constant over a wide gain range. For a
more complete explanation refer to application note OA-25:
Stability Analysis of Current-Feedback Amplifiers
.
Resistors have varying parasitics that affect circuit
performance in high-speed design. For best results, use
leaded metal-film resistors or surface mount resistors. A
SPICE model for the CLC5665 is available to simulate
overall circuit performance.
Enable/Disable Function
The CLC5665 amplifier features an enable/disable
function that changes the output and inverting input from
low to high impedance. The pin 8 enable/disable logic
levels are as follows:
V
CC
Enable
Disable
±15V
>12.7V
<10.0V
±5V
>2.7V
<0.8V
The amplifier is enabled with pin 8 left open due to the
2k
pull-up resistor, shown in Figure 2.
Figure 2: Pin 8 Equivalent Disable Circuit
Open-collector or CMOS interfaces are recommended to
drive pin 8. The turn-on and off time depends on the
speed of the digital interface.
The equivalent output impedance when disabled is
shown in Figure 3. With R
g
connected to ground, the sum
of R
f
and R
g
dominates and reduces the disabled output
impedance. To raise the output impedance in the dis-
abled state, connect the CLC5665 as a unity-gain
voltage follower by removing R
g
. Current-feedback
op-amps need the recommended R
f
in a unity-gain
follower circuit. For high density circuit layouts consider
using the dual CLC431 (with disable) or the dual CLC432
(without disable).
Figure 3: Equivalent Disabled Output Impedance
Non InvertingGain
1
R
R
InvertingGain
-R
R
f
g
f
g
=
+
=
R
in
R
g
R
f
CLC5665
-
+
V
in
V
o
R
s
To CLC5665
Bias network
2k
+
V
cc
Pin 8 DISABLE
8k
-
V
cc
Equivin Disable
R
f
V
out
R
g
V
in
300k
8pF
+
-
Z
o
)
Frequency (MHz)
1
10
100
1
10
100
1k
10k
100k
1M
CLC5665 Design Considerations
相關(guān)PDF資料
PDF描述
CLC5665IN Low Distortion Amplifier with Disable
CLC5665 Low Distortion Amplifier with Disable
CLC5801IM5X High Speed Low Noise Voltage Feedback Amplifier
CLC5801IMX High Speed Low Noise Voltage Feedback Amplifier
CLC5801 High Speed Low Noise Voltage Feedback Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CLC5665IN 制造商:Rochester Electronics LLC 功能描述:- Bulk
CLC5801 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Low Noise Voltage Feedback Amplifier
CLC5801IM 制造商:Rochester Electronics LLC 功能描述:- Bulk
CLC5801IM5 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Low Noise Voltage Feedback Amplifier
CLC5801IM5X 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Low Noise Voltage Feedback Amplifier
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