CLC5623IMX National Semiconductor, CLC5623IMX Datasheet - Page 15

• Manufacturer Part Number: CLC5623IMX
• Description: IC AMP VIDEO TRIPLE 14-SOIC
• Manufacturer: National Semiconductor

Specifications of CLC5623IMX

• Applications: Current Feedback
• Number Of Circuits: 3
• -3db Bandwidth: 148MHz
• Slew Rate: 370 V/µs
• Current - Supply: 3.2mA
• Current - Output / Channel: 130mA
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *CLC5623IMX

Application Division
Driving Cables and Capacitive Loads
When driving cables, double termination is used to prevent
reflections. For capacitive load applications, a small series
resistor at the output of the CLC5623 will improve stability
and settling performance. The Frequency Response vs. C
plot, shown below in Figure 9 , gives the recommended
series resistance value for optimum flatness at various
capacitive loads.
Transmission Line Matching
One method for matching the characteristic impedance (Z
of a transmission line or cable is to place the appropriate
resistor at the input or output of the amplifier. Figure 10
shows typical inverting and non-inverting circuit configura-
tions for matching transmission lines.
Non-inverting gain applications:
Inverting gain applications:
The input and output matching resistors attenuate the signal
by a factor of 2, therefore additional gain is needed. Use C
to match the output transmission line over a greater
frequency range. C
amplifier’s output impedance with frequency.
Power Dissipation
Follow these steps to determine the power consumption of
the CLC5623:
• Connect R
• Make R
• Use R
V
V
• Connect R
• Make the resistors R
• Make R
1
2
+
+
caused by the transmission line, or by parasitics.
-
-
R
R
1
4
FIGURE 10. Transmission Line Matching
1M
FIGURE 9. Frequency Response vs. C
3
1
5
, R
1k
to isolate the amplifier from reactive loading
\R
V
+
-
g
3
o
2
Z
Z
= 1V
g
directly to ground.
directly to ground.
, R
0
0
C
R
= Z
1k
L
s
= 100pF
6
pp
= 17.4
6
, and R
o
.
R
C
compensates for the increase of the
R
s
C
L
Frequency (Hz)
R
R
s
= 68.1
R
C
L
4
= 10pF
R
2
R
5
L
, R
= 1000pF
s
10M
3
g
= 6.7
7
6
, and R
equal to Z
1k
CLC5623
+
-
1/3
R
f
(Continued)
7
equal to Z
o
.
C
R
100M
6
6
DS015004-47
o
.
L
Z
0
DS015004-48
o
L
6
)
R
7
V
o
15
1.
P
2. Calculate the RMS power at the output stage:
P
voltage and current across the external load.
3. Calculate the total RMS power: P
The maximum power that the DIP and SOIC packages can
dissipate at a given temperature is illustrated in Figure 11 .
The power derating curve for any CLC5623 package can be
derived by utilizing the following equation:
where
T
package (˚C/W
Layout Considerations
A proper printed circuit layout is essential for achieving high
frequency performance. National provides evaluation boards
for the CLC5623 (CLC730075-DIP, CLC730074-SOIC) and
suggests their use as a guide for high frequency layout and
as an aid for device testing and characterization.
General layout and supply bypassing play major roles in high
frequency performance. Follow the steps below as a basis
for high frequency layout:
Evaluation Board Information
A data sheet is available for the CLC730075/CLC730074
evaluation boards. The evaluation board data sheet
provides:
• Include 6.8µF capacitors within a 0.1µF ceramic
• Place the 6.8µF capacitors within 0.75 inches of the
• Place the 0.1µF capacitors less than 0.1 inches from the
• Remove the ground plane under and around the part,
• Minimize all trace lengths to reduce series inductances.
• Use flush-mount printed circuit board pins for prototyping,
• Evaluation board schematics
• Evaluation board layouts
JA
amb
amp
o
=(V
Thermal resistance, from junction to ambient, for a given
capacitors on both supplies.
power pins.
power pins.
especially near the input and output pins to reduce
parasitic capacitance.
never use high profile DIP sockets.
=I
= Ambient temperature (˚C)
Calculate
CC
CC
−V
(V
FIGURE 11. Power Derating Curves
load
CC
−V
)(I
load
EE
the
)
), where V
quiescent
load
and I
t
=P
amp
(no-load)
load
DS015004-50
+P
are the RMS
o
www.national.com
power: