clc5623 National Semiconductor Corporation, clc5623 Datasheet - Page 6

• Manufacturer Part Number: clc5623
• Description: Triple, High Output, Video Amplifier
• Manufacturer: National Semiconductor Corporation

The CLC5623 is a current feedback amplifier built in an
advanced complementary bipolar process. The CLC5623
operates from a single 5V supply or dual ±5V supplies.
Operating from a single supply, the CLC5623 has the
following features:
The CLC5623 performance is further enhanced in ±5V
supply applications as indicated in the ±5V Electrical
Characteristics table and ±5V Typical Performance plots.
Current Feedback Amplifiers
Some of the key features of current feedback technology
are:
Current feedback operation can be described using a simple
equation. The voltage gain for a non-inverting or inverting
current feedback amplifier is approximated by Equation 1.
Single Supply Operation (V
The specifications given in the +5V Electrical Character-
istics table for single supply operation are measured with
a common mode voltage (V
age around which the inputs are applied and the
output voltages are specified.
Operating from a single +5V supply, the Common Mode
Input Range (CMIR) of the CLC5623 is typically +0.8V to
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±5V Typical Channel Matching Performance
1M
Channel Matching
PDIP Package
Provides 100mA of output current while
consuming 15mW of power
Offers low -85/-96dB 2nd and 3rd harmonic
distortion
Provides BW > 100MHz and 1MHz distortion
< -70dBc at V
Independence of AC bandwidth and voltage gain
Inherently stable at unity gain
Adjustable frequency response with feedback resistor
High slew rate
Fast settling
Frequency (Hz)
10M
o
Channel 2
= 2V
Channel 1
Channel 3
100M
pp
cm
CC
) of 2.5V. V
CLC5623 DESIGN INFORMATION
= +5V, V
EE
CLC5623 OPERATION
-20
-35
-45
-55
-65
-75
cm
1M
= GND)
Input Referred Crosstalk
V
is the volt-
o
= 1V
pp
Frequency (Hz)
10M
6
(A
v
where:
The denominator of Equation 1 is approximately equal to
1 at low frequencies. Near the -3dB corner frequency, the
interaction between R
performance. The value of the feedback resistor has a
large affect on the circuits performance. Increasing R
has the following affects:
Refer to the Feedback Resistor Selection section for
more details on selecting a feedback resistor value.
+4.2V. The typical output range with R
to +4.0V.
For single supply DC coupled operation, keep input
signal levels above 0.8V DC. For input signals that drop
below 0.8V DC, AC coupling and level shifting the signal
are recommended. The non-inverting and inverting
configurations for both input conditions are illustrated in
the following 2 sections.
= +2, R
V
V
in
f
o
A
R
Z(j ) is the CLC5623’s open loop
transimpedance gain
Decreases loop gain
Decreases bandwidth
Reduces gain peaking
Lowers pulse response overshoot
Affects frequency response phase linearity
Z j
= 1k (PDIP), R
v
R
f
is the feedback resistor
is the closed loop DC voltage gain
100M
f
1
is the loop gain
A
Z(j )
R
v
f
L
= 100 , V
Pulse Crosstalk
f
Active Output
Channel 1
and Z(j ) dominates the circuit
Equation 1
Active Output
Channel
CC
Time (20ns/div)
= ±5V, unless specified)
Inactive Output
Inactive Output
L
Channel 2
Channel 3
=100
is +1.0V
f