CLC5523I National Semiconductor, CLC5523I Datasheet

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CLC5523I

Manufacturer Part Number
CLC5523I
Description
Low-Power/ Variable Gain Amplifier
Manufacturer
National Semiconductor
Datasheet

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CLC5523
Low-Power, Variable Gain Amplifier
General Descriptions
The CLC5523 is a low power, wideband, DC-coupled, voltage-
controlled gain amplifier. It provides a voltage-controlled gain
block coupled with a current feedback output amplifier. High
impedance inputs and minimum dependence of bandwidth on
gain make the CLC5523 easy to use in a wide range of
applications.
control element in a variety of electronic systems which benefit
from a wide bandwidth of 250MHz and high slew rate of
1800V/ms, with only 135mW of power dissipation.
Input impedances in the megaohm range on both the signal
and gain control inputs simplify driving the CLC5523 in any
application. The CLC5523 can be configured to use pin 3 as a
low impedance input making it an ideal interface for current
inputs. By using the CLC5523’s inverting configuration in which
R
voltage range may be used.
The gain control input (V
linear-in-dB gain control, simplifies the implementation of AGC
circuits. The gain control circuit can adjust the gain as fast as
4dB/ns. Maximum gains from 2 to 100 are accurately and simply
set by two external resistors while attenuation of up to 80dB from
this gain can be achieved.
The extremely high slew rate of 1800V/ms and wide bandwidth
provides high speed rise and fall times of 2.0ns, with settling time
for a 2 volt step of only 22ns to 0.2%. In time domain applications
where linear phase is important with gain adjust, the internal cur-
rent mode circuitry maintains low deviation of delay over a wide
gain adjust range.
© 2000 National Semiconductor Corporation
Printed in the U.S.A.
G
is driven directly, inputs which exceed the device’s input
Variable Gain Amplifier
Typical Application
Circuit
This amplifier is suitable as a continuous gain
G
), with a 0 to 2V input range, and a
V
R
in
g
25W
2
3
CLC5523
V
-
+
G
1
4
+5V
-5V
8
5
7
6
R
f
V
R
o
L
Features
Applications
Low power: 135mW
250MHz, -3dB bandwidth
Slew rate 1800V/ms
Gain flatness 0.2dB @ 75MHz
Rise & fall times 2.0ns
Low input voltage noise 4nV/ÖHz
Automatic gain control
Voltage controlled filters
Automatic signal leveling for A/D
Amplitude modulation
Variable gain transimpedance
-10
-20
-30
-40
-50
30
20
10
0
1M
Frequency Response with Changes in V
GND
V
V
R
IN
G
g
Frequency (Hz)
DIP & SOIC
10M
Pinout
X1
+
-
100M
http://www.national.com
March 2000
+V
I-
V
-V
O
CC
CC
g

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CLC5523I Summary of contents

Page 1

... Typical Application Variable Gain Amplifier Circuit © 2000 National Semiconductor Corporation Printed in the U.S.A. Features Applications ...

Page 2

... Model CLC5523IN CLC5523IM CLC5523IMX Contact the factory for other packages. ±7V Package Thermal Resistance ±80mA +150 ˚ C Package -65 ˚ +150 ˚ C +300 ˚ C DIP (IN) Small Outline (IM) TBD 2 = 100W 100W 2V; unless specified MIN/MAX RATINGS UNITS 25˚ ...

Page 3

CLC5523 Typical Performance Frequency Response (A =10) vmax -10 -15 -20 -25 - 100 Frequency (MHz) Frequency Response vs 360 Magnitude L 180 Phase 0 R ...

Page 4

CLC5523 Typical Performance 2nd Harmonic Distortion vs. Frequency - -40 -50 2nd R = 100W L -60 -70 -80 2nd -90 -100 1 10 Frequency (MHz) Harmonic Distortion vs. Gain -30 ...

Page 5

The key features of the CLC5523 are: Low Power Broad voltage controlled gain and attenuation range Bandwidth independent, resistor programmable gain range Broad signal and gain control bandwidths Frequency response may be adjusted with R High Impedance signal and gain ...

Page 6

The CLC425 is a low noise wideband voltage feedback amplifier. Setting R2 at 909W and R1 at 100W produces a gain of 20dB. Setting R at 1000W as recommended f and R at 50W, produces a gain of 26dB in ...

Page 7

Minimizing Parasitic Effects on Small Signal Bandwidth The best way to minimize parasitic effects is to use the small outline package and surface mount components. For designs utilizing through-hole specifically axial resistors, resistor self-capacitance should be considered. Example: the average ...

Page 8

... Evaluation boards are available for both the 8-pin DIP and small outline package types. Evaluation kits that contain an evaluation board and CLC5523 samples can be obtained by calling National Semiconductor’s Customer Service Center at 1-800-272-9959. The 8-pin DIP evaluation kit part number is CLC730065. The 8-pin small outline evaluation kit part number is CLC730066 ...

Page 9

Comlinear Layer1 Figure 6: DIP Evaluation Board (Top Layer) Comlinear Layer1 Silk Figure 8: Small Outline Evaluation Board (Top Layer) Comlinear Layer2 Figure 7: DIP Evaluation Board (Bottom Layer) Comlinear Layer2 Silk Figure ...

Page 10

Digital Gain Control Digitally variable gain control can be easily realized by driving the CLC5523’s gain control input with a digital-to-analog converter (DAC). Figure 10 illustrates such an application. This circuit employs National Semiconductor’s eight-bit DAC0830, the LM351 JFET input ...

Page 11

R +5V 100W Level Adj. C 100W i 100pF -5V 1 Signal 2 Input U1 6 CLC5523 100W 1k Figure 12: Automatic Gain Control Circuit #2 c 150W 1 25W ...

Page 12

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, a) are intended for surgical implant into the body support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user ...

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