CLC5623IMX National Semiconductor, CLC5623IMX Datasheet - Page 17

• 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
Differential
Conversion
The circuit shown in the Typical Application schematic on
the front page and in , operates as a differential line driver.
The transformer converts the load impedance to a value that
best matches the CLC5623’s output capabilities. The
single-ended input signal is converted to a differential signal
by the CLC5623. The line’s characteristic impedance is
matched at both the input and the output. The schematic
shows Unshielded Twisted Pair for the transmission line;
other types of lines can also be driven.
Set up the CLC5623 as a difference amplifier:
Make the best use of the CLC5623’s output drive capability
as follows:
where R
V
Output Current.
Match the line’s characteristic impedance.
V
in
max
R
t1
R
g1
FIGURE 17. Differential Line Driver With Load
is the Output Voltage Range, and I
+
CLC5623
-
eq
1/3
R
V
V
g2
R
is the transformed value of the load impedance,
in
f1
d
V
Line
d/2
R
R
t2
Impedance Conversion
2
m
+
R
R
-
CLC5623
n
1/3
Driver
R
L
m
R
f2
1
eq
-V
R
Z
R
d/2
R
R
R
o
eq
eq
L
g1
With
R
R
f1
R
2 V
m/2
m/2
eq
I
(Continued)
max
1:n
max
Load
2
max
R
R
is the maximum
g2
f2
Impedance
UTP
Z
o
DS015004-56
I
o
R
L
V
17
+
-
o
Select the transformer so that it loads the line with a value
very near Z
the CLC5623 also affects the match. With an ideal
transformer we obtain:
Return Loss
where Z
and |Zo(5623)(j )
The load voltage and current will fall in the ranges:
The CLC5623’s high output drive current and low distortion
make it a good choice for this application.
Bandpass Filter
illustrates a low sensitivity bandpass filter and design
equations. This topology utilizes the CLC5623’s closely
matched amplifiers to obtain low op amp sensitivity at high
frequencies. The third CLC5623 is used as a buffer to obtain
low output impedance. The overall circuit gain is unity. For
additional gain, the third CLC5623 can be configured as a
non-inverting amplifier.
To design the filter, choose C and then determine values for
R and R
factor.
Instrumentation Amplifier
An instrumentation circuit is shown on the front page and
reproduced in . The DC CMRR can be fine tuned by
adjusting R
R
V
R
in
o
1
(5623)(j ) is the output impedance of the CLC5623
FIGURE 18. Bandpass Filter Topology
based on the desired resonant frequency (f
2 f C
o
R
1
R
1
.
over frequency range. The output impedance of
1
CLC5623
r
1/3
20 log
<<
+
I
-
V
C
o
R
o
1
R
m
10
.
QR
I
max
n
n V
n
2
R
Z
max
CLC5623
o 5623
-
+
Z
1/3
o
R
CLC5623
-
+
R
C
1/3
j
f
DS015004-62
www.national.com
,dB
V
r
) and Q
o