clc520 National Semiconductor Corporation, clc520 Datasheet

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clc520

Manufacturer Part Number
clc520
Description
Amplifier With Voltage Controlled Gain, Agc+amp
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2001 National Semiconductor Corporation
CLC520
Amplifier with Voltage Controlled Gain, AGC +Amp
General Description
The CLC520 is a wideband DC-coupled amplifier with volt-
age controlled gain (AGC). The amplifier has a high imped-
ance, differential signal input; a high bandwidth, gain control
input; and a single-ended voltage output. Signal channel
performance is outstanding with 160MHz small signal band-
width, 0.5 degree linear phase deviation (to 60MHz) and
0.04% signal nonlinearity at 4V
Gain control is very flexible and easy to use. Maximum gain
may be set over a nominal range of 2 to 100 with one
external resistor. In addition, the gain control input provides
more than 40dB of voltage controlled gain adjustment from
the maximum gain setting. For example, a CLC520 may be
set for a maximum gain of 2 (or 6dB) for a voltage controlled
gain range from 40dB to less than 34dB. Alternatively, the
CLC520 could be set for a maximum gain of 100 or (40dB)
for a voltage controlled gain range from 40dB to less than
0dB.
The gain control bandwidth of 100MHz is superb for AGC/
ALC loop stabilization. And since the gain is minimum with a
zero volt input and maximum with a +2 volt input, driving the
control input is easy.
Finally, the CLC520 differential inputs, and ground refer-
enced voltage output take the trouble out of designing
DC-coupled AGC circuits for display normalizers; signal lev-
eling automatic circuits; etc.
Enhanced Solutions (Military/Aerospace)
SMD Number: 5962-91694
Space level versions also available.
For more information, visit http://www.national.com/mil
Gain vs. V
PP
output.
g
01275639
DS012756
Features
n 160MHz, −3dB bandwidth
n 2000V/µsec slew rate
n 0.04% signal nonlinearity at 4V
n −43dB feedthrough at 30MHz
n User adjustable gain range
n Differential voltage input and single-ended voltage
Applications
n Wide bandwidth AGC systems
n Automatic signal leveling
n Video signal processing
n Voltage controlled filters
n Differential amplifier
n Amplitude modulation
Connection Diagram
output
Gain vs. V
DIP & SOIC
Pinout
PP
g
output
01275629
01275640
www.national.com
May 2001

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clc520 Summary of contents

Page 1

... For example, a CLC520 may be set for a maximum gain of 2 (or 6dB) for a voltage controlled gain range from 40dB to less than 34dB. Alternatively, the CLC520 could be set for a maximum gain of 100 or (40dB) for a voltage controlled gain range from 40dB to less than 0dB. ...

Page 2

... Ordering Information Package 14-pin plastic DIP 14-pin plastic SOIC www.national.com Temperature Range Part Number Industrial −40˚C to +85˚C CLC520AJP −40˚C to +85˚C CLC520AJE 2 Package NSC Marking Drawing CLC520AJP N14A CLC520AJE M14A ...

Page 3

... Lead Solder Duration (+300˚C) ± 7V ESD (human body model) Operating Ratings Thermal Resistance 60mA Package ± V MDIP CC 10V SOIC ± ± 182 , V = +2V; unless specified Conditions CLC520AJ < V 0.5V OUT PP < V 0.5V (AJE only) OUT PP < V 4.0V OUT PP < V 0.5V OUT +0.2V +1VDC IN g < ...

Page 4

Electrical Characteristics ± +10 5V 100 , Symbol Parameter IB Input Bias Current (Note 5) DIB Average Temperature Doefficient IOS Input Offset Current DIOS Average Temperature Coefficient PSS Power Supply ...

Page 5

Typical Performance Characteristics ± 25˚ +10 5V 182 , V = +2V Frequency Response, A VMAX Frequency Response, A VMAX Small Signal Gain vs. ...

Page 6

Typical Performance Characteristics = 182 , V = +2V) (Continued) g 3rd Harmonic Distortion Gain vs. V Large and Small Signal Pulse Response www.national.com (T = 25˚ 2nd and 3rd Harmonic Distortion vs. V 01275602 g 01275640 01275642 ...

Page 7

Typical Performance Characteristics = 182 , V = +2V) (Continued) g Settling Time 1.2V g Settling Time vs. Capacitive Load, A Gain Control Channel Feedthrough (T = 25˚ +10 Long-Term Settling Time 01275614 ...

Page 8

Typical Performance Characteristics = 182 , V = +2V) (Continued) g Differential Gain and Phase Output Noise vs. V Linearity 0.75V to 1.4V g www.national.com (T = 25˚ +10 01275643 g 01275622 01275645 ...

Page 9

... Application Information FIGURE 1. CLC520 Simplified Schematic Simplified Circuit Description A simplified schematic for the CLC520 is given in Figure and −V are buffered with closed-loop voltage follow ers inducing a signal current in R (+V )−(−V ), the differential input voltage. This current con trols a current source which supplies two well matched tran- sistors, Q1 and Q2 ...

Page 10

... If the maximum input amplitude exceeds the above V then CLC520 should either be moved to a location in the signal chain where input amplitudes are reduced, or the CLC520 gain A should be reduced or the values for R VMAX and R should be increased ...

Page 11

... FIGURE 8. Automatic Gain Control (AGC) Loop , The AGC circuits io Figure 8 shows a typical AGC circuit. The CLC520 is fol- lowed up with a CLC401 for higher overall gain. The output of the CLC401 is rectified and fed to an inverting integrator using a CLC420 (wideband voltage feedback op amp). When the output voltage, V output voltage ramps down reducing the net gain of the /2 ...

Page 12

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 14-Pin MDIP NS Package Number N14A 14-Pin SOIC NS Package Number M14A 12 ...

Page 13

... 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 ...

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