clc5523 National Semiconductor Corporation, clc5523 Datasheet

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clc5523

Manufacturer Part Number
clc5523
Description
Low-power, Variable Gain Amplifier
Manufacturer
National Semiconductor Corporation
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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clc5523 Summary of contents

Page 1

... 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 low impedance input making it an ideal interface for current inputs. By using the CLC5523’s inverting configuration in which R is driven directly, inputs which exceed the device’ ...

Page 2

... CLC5523 Electrical Characteristics PARAMETERS CONDITIONS Ambient Temperature CLC5523I FREQUENCY DOMAIN RESPONSE -3dB bandwidth peaking DC to 200MHz (V rolloff DC to 75MHz (V linear phase deviation DC to 75MHz (V gain control bandwidth V in TIME DOMAIN RESPONSE rise and fall time 0.5V step overshoot 0.5V step settling time to 0.2% ...

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 50W -180 100W L -360 -450 1 10 100 Frequency (MHz) PSRR & R out 60 100 PSRR ...

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 - 100 V = 100mV -50 2nd = 10MHz -70 3rd = 10MHz 2nd = 1MHz -90 3rd = 1MHz -110 0 Gain ( Short Term Settling Time ...

Page 5

... Broad signal and gain control bandwidths Frequency response may be adjusted with R High Impedance signal and gain control Inputs The CLC5523 combines a closed loop input buffer, a volt- age controlled variable gain cell and an output amplifier. The input buffer is a transconductance stage whose gain ...

Page 6

... For example, with 46dB of gain, a 20mV signal at the input will drive the out- put of the CLC425 to 200mV, the output of the CLC5523 to 4V. Accordingly, the designer must carefully consider the contributions of each stage to the overall characteris- tics ...

Page 7

... C L Long traces and/or lead lengths between R and the CLC5523 Keep these traces as short as possible Long traces between CLC5523 and 0.1mF bypass capacitors Keep these traces less than 0.2 inches (5mm) For the devices in the PDIP package, an components, additional 1000pF monolithic capacitor should be placed less than 0.1” ...

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

... Automatic Gain Control (AGC CLC5523 Figure 12 on the following page, illustrates an automatic 3 7 gain control circuit that employs two CLC5523’s. In this circuit, U1 receives the input signal and produces an 1k 25W output signal of constant amplitude configured to provide negative feedback. U2 generates a rectified ...

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 100W CLC5523 R 50W g2 3 100W 2.2mF 4 Output http://www.national.com ...

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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