clc405 National Semiconductor Corporation, clc405 Datasheet - Page 6

• Manufacturer Part Number: clc405
• Description: Low-cost, Low-power, 110mhz Op Amp With Disable
• Manufacturer: National Semiconductor Corporation

The values used to produce Graph 2 are:
R
R
Amplitude Equalization
Sending signals over coaxial cable greater than 50
meters in length will attenuate high frequency signal
components. Equalizers restore the attenuated com-
ponents of this signal. The circuit in Figure 4, is an op
amp equalizer. The RC networks peak the response of
the CLC405 at higher frequencies.
restores cable-attenuated frequencies. Graph 2 shows
how the equalizer actually restored a digital word
through 150 meters of coaxial cable.
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Life Support Policy
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 of National Semiconductor Corporation. As used herein:
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said
circuitry and specifications.
N
g
1
= 348
= 450
1. Life support devices or systems are devices or systems which, a) are intended for surgical implant into the body, or b) support or
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to
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.
cause the failure of the life support device or system, or to affect its safety or effectiveness.
Coaxial Cable
Digital Word Amplitude Equalization
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Corporation
1111 West Bardin Road
Arlington, TX 76017
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Unequalized
Equalized
C
R
1
2
R
R
= 470pF
= 90
g
t
Time (200ns/div)
Input
RC Networks
Figure 4
Graph 2
R
C
1
CLC405
1
+
-
R
R
C
f
2
C
2
= 348
2
= 70pF
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Output
This peaking
6
Amplitude Equalizer
Place the first zero (fz
khz for Graph 2). R
750khz) that cancels fz
higher frequency (fz
canceling pole (of fp
Graph 3 shows the closed loop response of the op
amp equalizer with equations for the poles, zeros,
and gains.
Note: For very-high frequency equalization, use a higher
bandwidth part (i.e. CLC44X)
Plastic (AJP)
Surface Mount (AJE)
CerDip
Model
CLC405AJP
CLC405AJE
CLC405AIB
CLC405ALC
CLC405AMC
CLC405A8B
Contact factory for other packages and DESC SMD number.
Package
Package Thermal Resistance
National Semiconductor
Hong Kong Ltd.
2501 Miramar Tower
1-23 Kimberley Road
Tsimshatsui, Kowloon
Hong Kong
Tel: [phone]
Fax: [phone]
Closed Loop Equalizer Frequency Response
fz
fp
G
G
Ordering Information
1
1
Temperature Range
2
1
-40
-40
-40
-40
-55
-55
20log (1
20log (1
2 R C
2R C
fz
˚
˚
˚
˚
˚
˚
1
C to +85
C to +85
C to +85
C to +85
C to +125
C to +125
1
1
1
1
1
1
2
2
2R
R C
R
2R
R
Frequency (Hz)
g
g
eq
1
= 25Mhz).
1
@ 12Mhz). R
2
)
fp
1
1
Graph 3
)
R
) at some low frequency (540
& C
1
1
˚
˚
˚
˚
eq
130
. Place a second zero at a
C
C
C
C
˚
˚
75
65
G
C
C
R llR
1
˚
˚
jc
1
˚
1
/W
/W
/W
fz
fz
g
produce a pole (fp
2
2
8-pin PDIP
8-pin SOIC
8-pin CerDIP
dice
dice, MIL-STD-883
8-pin CerDIP, MIL-STD-883
National Semiconductor
Japan Ltd.
Tel: [phone]
Fax: [phone]
2R C
fp
2
fp
2
1
2
2
1
2 R C
Description
R C
& C
G
eq
1
2
2
2
2
125
150
155
2
provide a
jA
˚
˚
˚
/W
/W
/W
1
@