clc522 National Semiconductor Corporation, clc522 Datasheet

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clc522

Manufacturer Part Number
clc522
Description
Wideband Variable-gain Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2001 National Semiconductor Corporation
CLC522
Wideband Variable Gain Amplifier
General Description
The CLC522 variable gain amplifier (VGA) is a dc-coupled,
two-quadrant multipliers with differential voltage inputs and a
single-ended voltage output. Two input buffers and an output
operational amplifier are integrated with the multiplier core
and make the CLC522 a complete VGA system that does not
require external buffering.
The CLC522 provides the flexibility of externally setting the
maximum gain with only two external resistors. Greater than
40dB gain control is easily achieved through a single high
impedance voltage input. The CLC522 provides a linear (in
Volts per Volt) relationship between the amplifier’s gain and
the gain-control input voltage.
The CLC522’s maximum gain may be set anywhere over a
nominal range of 2V/V to 100V/V. The gain control input then
provides attenuation from the maximum setting. For ex-
ample, set for a maximum gain of 100V/V, the CLC522 will
provide a 100V/V to 1V/V gain control range by sweeping the
gain control input voltage from +1 to −0.98V.
Set at a maximum gain of 10V/V, the CLC522 provides a
165MHz signal channel bandwidth and a 165MHz gain con-
trol bandwidth. Gain nonlinearity over a 40dB gain range is
0.5% and gain accuracy at A
Features
n 330MHz signal bandwidth: A
n 165MHz gain control bandwidth
n 0.3˚ to 60MHz linear phase deviation
n 0.04% (−68dB) signal-channel non-linearity
n
Connection Diagram
>
40dB gain adjustment range
Vmax
Vmax
= 10V/V is typically
= 2
DS012718
±
0.3%.
DIP & SOIC
Pinout
n Differential or single end voltage inputs
n Single-ended voltage output
Applications
n Variable attenuators
n Pulse amplitude equalizers
n HF modulators
n Automatic gain control & leveling loops
n Video production switching
n Differential line receivers
n Voltage controlled filters
DS012718-4
Gain vs. Gain Control Voltage (V
DS012718-1
January 2001
www.national.com
g
)

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clc522 Summary of contents

Page 1

... The CLC522’s maximum gain may be set anywhere over a nominal range of 2V/V to 100V/V. The gain control input then provides attenuation from the maximum setting. For ex- ample, set for a maximum gain of 100V/V, the CLC522 will provide a 100V/V to 1V/V gain control range by sweeping the gain control input voltage from +1 to −0.98V. ...

Page 2

... Typical Application Ordering Information Package 14-pin plastic DIP 14-pin plastic SOIC www.national.com 2nd Order Tuneable Bandpass Filter Temperature Range Part Number Industrial −40˚C to +85˚C CLC522AJP −40˚C to +85˚C CLC522AJE 2 DS012718-2 DS012718-3 Package NSC Marking Drawing CLC522AJP N14A CLC522AJE M14A, B ...

Page 3

... Lead Temperature (Soldering 10 sec) Operating Ratings Thermal Resistance ± 7V Package 80mA MDIP ± V SOIC CC +200˚C −65˚C to +150˚C = 182 ; R = 100 ; V = +1.1V Conditions Typ CLC522AJE, AJP +25˚C < V 0.5V 165 OUT PP < V 5.0V 150 OUT PP < V 0.5V 165 OUT PP < V 0.5V OUT ...

Page 4

Electrical Characteristics ± +10 Vmax f Symbol Parameter Static, DC Performance V Bias Current g Average Drift Resistance Capacitance Output Voltage Range Current Offset Voltage (Note 4) Average ...

Page 5

Typical Performance Characteristics Frequency Response (A =100) Vmax Feed-Through Isolation SGNL vs Gain g (Continued) PSRR and CMRR (input Referred) DS012718-7 Gain Flatness & Linear Phase Deviation DS012718-9 Large Signal Frequency Response DS012718-11 5 DS012718-8 DS012718-10 DS012718-12 www.national.com ...

Page 6

Typical Performance Characteristics Large & Small Signal Pulse Response Gain Control Channel Feedthrough Long Term Settling Time www.national.com (Continued) Gain Control Settling Time & Delay DS012718-13 Short Term Settling Time DS012718-15 Settling Time vs. Capacitive Load DS012718-17 6 DS012718-14 DS012718-16 ...

Page 7

Typical Performance Characteristics Settling Time vs. Gain Differential Gain & Phase 2nd Harmonic Distortion vs. P OUT (Continued) Differential Gain & Phase DS012718-19 Input Referred Voltage Noise vs. A DS012718-21 3rd Harmonic Distortion vs. P DS012718-23 7 DS012718-20 Vmax DS012718-22 ...

Page 8

... The gain of the CLC522 is therefore a function of three external variables; R gain control voltage (V) has an ideal input range of − 1V, the gain of the CLC522 is at its maximum g as expressed in Eq. 3. Notice also that Eq. 3 holds for both differential and single- ended operation. ...

Page 9

... As illustrated in Figure 3 , the trip pot located at R14 on the CLC522 Evaluation Board should then be adjusted in order to null the offset voltage seen at the CLC522’s output (pin 10). Once this is accomplished, the offset errors introduced by the input stage and multiplier core can then be treated. ...

Page 10

... FIGURE 5. Input referred Voltage Noise vs. A Circuit Layout Considerations Please refer to the CLC522 Evaluation Board literature for precise layout guidelines. Good high-frequency operation requires all of the de-coupling capacitors shown placed as close as possible to the power supply pins in order to insure a proper high-frequency low-impedance bypass ...

Page 11

... The center frequency of the 2nd order bandpass illustrated on the front page is adjusted through the use of the CLC522’s gain-control voltage, V The integrators implemented with two CLC420s, provide the coefficients for the transfer function. ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 14-Pin SOIC NS Package Number M14A 14-Pin SOIC NS Package Number M14B 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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