CLC5665IN National Semiconductor, CLC5665IN Datasheet - Page 10

• Manufacturer Part Number: CLC5665IN
• Description: IC AMP LOW DISTORTION 8-DIP
• Manufacturer: National Semiconductor

Specifications of CLC5665IN

• Amplifier Type: Current Feedback
• Number Of Circuits: 1
• Slew Rate: 1800 V/µs
• -3db Bandwidth: 90MHz
• Current - Input Bias: 3µA
• Voltage - Input Offset: 15000µV
• Current - Supply: 11mA
• Current - Output / Channel: 85mA
• Voltage - Supply, Single/dual (±): 10 V ~ 30 V, ±5 V ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• Gain Bandwidth Product: -
• Other names: *CLC5665IN

www.national.com
Application Division
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.
V
Set up the CLC5665 as a difference amplifier. V
mined by:
Make the best use of the CLC5665’s output drive capability
as follows:
where R
V
Output Current.
Match the line’s characteristic impedance:
Select the transformer so that it loads the line with a value
very near Z
of the CLC5665 also affects the match. With an ideal trans-
former we obtain:
where Z
and |Z
The load voltage and current will fall in the ranges:
The CLC5665’s high output drive current and low distortion
make it a good choice for this application.
in
R
max
t1
R
g1
is the Output Voltage Range, and I
FIGURE 7. Differential Line Driver with Load
O(5665)
+
CLC5665
-
o(5665)
eq
R
V
g2
V
R
is the transformed value of the load impedance,
O
in
f1
d
(j )|
V
over frequency range. The output impedance
(j ) is the output impedance of the CLC5665
d/2
R
t2
2
<<
Impedance Conversion
CLC5665
+
-
R
R
n
R
1
R
L
m
m
f2
.
R
R
R
-V
Z
R
R
g1
f1
d/2
o
eq
eq
L
R
R
R
m/2
m/2
eq
2
(Continued)
R
1:n
R
g2
f2
max
is the maximum
UTP
Z
o
d
is deter-
DS015015-28
I
o
R
L
V
+
-
10
o
Full Duplex Cable Driver
The circuit shown in Figure 8 below, operates as a full duplex
cable driver which allows simultaneous transmission and
reception of signals on one transmission line. The circuit on
either side of the transmission line uses are CLC5665 as a
cable driver, and the second CLC5665 as a receiver. V
an attenuated version of V
version of V
V
R
the DC gain of the CLC5665, which is used in a difference
mode. R
mitting CLC5665’s are shown in a unity gain configuration
because they consume the least power of any gain, for a
given load. For proper operation we need R
The receiver output voltages are:
V
where A is the attenuation of the cable, Z
ouput impedance of the CLC5665, and |Z
We selected the component values as follows:
• R
• R
• R
• R
These values give excellent isolation from the other input:
The CLC5665 provides large output current drive, while
consuming little supply current, at the nominal bias point. It
also produces low distortion with large signal swings and
heavy loads. These features make the CLC5665 an excel-
lent choice for driving transmission lines.
V
inA
oB
V
m1
outA(B)
R
t1
offset
gain
sion line
CLC5665 at A
is used to match the transmission line. R
f
m1
f2
t2
1 1.2k , the recommended value for CLC5665 at unity
= R
= (R
Z
V
t2
o
in
CLC5665
=50, the characteristic impedance of the transmis-
V
V
CLC5665
FIGURE 8. Full Duplex Cable Driver
+
R
R
-
provides good CMRR and DC offset. The trans-
g2
R
V
inB(A)
oA(B)
f2
f1
f2
inB
inA(B)
||R
+
-
750
.
R
R
g2
T
g2
V
)–R
R
=2
t2
R
A
R
m1
38dB, f
m1
Rm1, the recommended value for the
g
/2 = 25
V
+
CLC5665
-
inB(A)
2
inA
R
Z
0
f
, while V
5.0MHz
1
R
R
R
m1
R
g2
oB
f2
t2
o(5665)
R
g2
o(5665)
is a attenuated
f2
R
CLC5665
f2
Z
CLC5665
+
-
s
= R
R
R
(j )|
o(5665)
and R
f1
f2
+
-
(j ) is the
R
g2
<<
m1
.
DS015015-34
g2
(j )
R
oA
C
V
m1
set
L
R
V
V
o
is
t1
inB
oA
.