clc5622 National Semiconductor Corporation, clc5622 Datasheet - Page 6

• Manufacturer Part Number: clc5622
• Description: Dual, High Output, Video Amplifier
• Manufacturer: National Semiconductor Corporation

The CLC5622 is a current feedback amplifier built in an
advanced complementary bipolar process. The CLC5622
operates from a single 5V supply or dual ±5V supplies.
Operating from a single supply, the CLC5622 has the
following features:
The CLC5622 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 CLC5622 is typically +0.8V to
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±5V Typical Channel Matching Performance
Channel Matching
Provides 100mA of output current while
consuming 15mW of power
Offers low -80/-83dB 2nd and 3rd harmonic
distortion
Provides BW > 80MHz and 1MHz distortion
< -75dBc 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
1M
Frequency (Hz)
10M
o
= 2V
Channel 1
pp
Channel 2
100M
cm
CC
) of 2.5V. V
CLC5622 DESIGN INFORMATION
= +5V, V
EE
CLC5622 OPERATION
-20
-30
-40
-50
-60
-70
-80
-90
cm
= GND)
Input Referred Crosstalk
V
is the volt-
o
= 1V
1M
pp
Frequency (Hz)
6
10M
(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 CLC5622’s open loop
transimpedance gain
Decreases loop gain
Decreases bandwidth
Reduces gain peaking
Lowers pulse response overshoot
Affects frequency response phase linearity
100M
Z j
= 750 , R
v
R
f
is the feedback resistor
is the closed loop DC voltage gain
f
1
is the loop gain
A
Z(j )
R
v
L
f
= 100 , V
Pulse Crosstalk
f
and Z(j ) dominates the circuit
Equation 1
Active Output
CC
Channel
= ±5V, unless specified)
Time (10ns/div)
Inactive Output
L
=100
Channel
is +1.0V
f