Features
s
170MHz small signal bandwidth
s
1000 V/
s slew rate
s
2.5mA / channel supply current
s
-72/-79dBc HD2/HD3 (5MHz)
s
0.04%, 0.07 differential gain, phase
s
70mA output current
s
16ns settling to 0.1%
Applications
s
Portable equipment
s
Video switchers & routers
s
Video line driver
s
Active filters
s
IF amplifier
s
Twisted pair driver/receiver
Typical Configurations
Non-Inverting Gain
Inverting Gain
Pinout
DIP & SOIC
General Description
The CLC5644 is a quad, current feedback operational amplifier
that is perfect for many cost-sensitive applications that require
high performance, especially when power dissipation is critical.
Not only does the CLC5644 offer excellent economy in board
space, but has an excellent performance vs power tradeoff which
yields a 170MHz Small Signal Bandwidth while dissipating only
25mW. Applications requiring significant density of high speed
devices such as video routers, matrix switches and high-order
active filters will benefit from the configuration of the CLC5644 and
the low channel-to-channel crosstalk of 76dB at 1MHz.
The CLC5644 provides excellent performance for video
applications.
Differential gain and phase of 0.04% and 0.07
makes this device well suited for many professional composite
video systems, but consumer applications will also be able to take
advantage of these features due to the device's low cost. The
CLC5644 offers superior dynamic performance with a small
signal bandwidth of 170MHz and slew rate of 1000V/
s. These
attributes are well suited for many component video applications
such as driving RGB signals down significant lengths of cable.
These and many other applications can also take advantage of
the 0.1dB flatness to 25MHz.
Combining wide bandwidth with low cost makes the the CLC5644
an attractive option for active filters. SAW filters are often used
in IF filters in the 10's of MHz range, but higher order filters
designed around a quad operational amplifier may offer an
economical alternative to the typical SAW approach and offer
greater freedom in the selection of filter parameters. National
Semiconductor's Comlinear Products Group has published a
wide array of liturature on active filters and a list of these
publications can be found on the last page of this datasheet.
Non-Inverting Frequency Response
Normalized Magnitude (0.5dB/div)
Frequency (Hz)
1M
10M
100M
V
o
= 0.25V
pp
A
v
= +1
R
f
= 6.98k
A
v
= +2
R
f
= 1.65k
A
v
= +5
R
f
= 499
A
v
= +10
R
f
= 249
CLC5644
Low-Power, Low-Cost, Quad Operational Amplifier
N
June 1999
CLC5644
Lo
w-P
o
wer
,
L
o
w-Cost,
Quad Operational Amplifier
1999 National Semiconductor Corporation
http://www.national.com
Printed in the U.S.A.
+
-
1/4
CLC5644
R
f
0.1
F
6.8
F
V
o
V
in
V
CC
0.1
F
6.8
F
V
EE
+
+
R
g
R
t
+
-
R
f
0.1
F
6.8
F
V
o
V
in
V
CC
0.1
F
6.8
F
V
EE
R
g
R
b
+
+
R
t
Note: R
b
provides DC bias
for the non-inverting input.
Select R
t
to yield desired
R
in
= R
t
|| R
g
.
V
V
A
R
R
o
in
v
f
g
=
= -
V
V
A
1
R
R
o
in
v
f
g
=
= +
1/4
CLC5644
http://www.national.com
2
PARAMETERS
CONDITIONS
TYP
MIN/MAX RATINGS
UNITS
NOTES
Ambient Temperature
CLC5644I
+25C
+25C
-40 to 85C
FREQUENCY DOMAIN RESPONSE
-3dB bandwidth
A
v
= 1
170
MHz
V
o
< 0.5V
pp
125
MHz
V
o
< 5V
pp
50
MHz
0.1dB bandwidth
25
MHz
differential gain
NTSC, R
L
= 150
0.04
dB
differential phase
NTSC, R
L
= 150
0.07
dB
TIME DOMAIN RESPONSE
rise and fall time
0.5V step
2.7
ns
5V step
7
ns
settling time to 0.1%
1V step
16
ns
overshoot
0.5V step
4
%
slew rate
1000
V/
s
DISTORTION AND NOISE RESPONSE
2
nd
harmonic distortion
2V
pp
, 1MHz
-72
dBc
3
rd
harmonic distortion
2V
pp
, 1MHz
-79
dBc
equivalent input noise
voltage (e
ni
)
>1MHz
4.5
nV/
Hz
non-inverting current (i
bn
)
>1MHz
1.5
pA/
Hz
inverting current (i
bi
)
>1MHz
10
pA/
Hz
crosstalk (input inferred)
10MHz
76
dBc
STATIC DC PERFORMANCE
input offset voltage
2.5
7
15
mV
A
average drift
25
90
V/C
input bias current (non-inverting)
2
6
10
A
A
average drift
15
80
nA/C
input bias current (inverting)
2.5
7.5
22
A
A
average drift
24
150
nA/C
power supply rejection ratio
DC
50
46
44
dB
common-mode rejection ratio
DC
50
45
43
dB
supply current (per channel)
R
L
=
2.5
3
3
mA
A
MISCELLANEOUS PERFORMANCE
input resistance (non-inverting)
2
1
0.5
M
input capacitance (non-inverting)
1
2
2
pF
common-mode input range
2.2
2.0
1.4
V
output voltage range
R
L
= 150
2.8
2.6
2.5
V
output current
70
50
30
mA
output resistance, closed loop
DC
0.2
0.3
0.6
m
Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are
determined from tested parameters.
CLC5644 Electrical Characteristics
(A
v
= +2, R
f
= 1.65k
, R
L
= 100
, V
s
= 5V, unless specified)
Absolute Maximum Ratings
supply voltage (V
CC
- V
EE
)
+14V
output current
95mA
common-mode input voltage
V
EE
to V
CC
maximum junction temperature
+150C
storage temperature range
-65C to +150C
lead temperature (soldering 10 sec)
+300C
Notes
A) I-level: spec is 100% tested at +25C.
Reliability Information
Transistor Count
152
MTBF (based on limited test data)
23.6Mhr
Ordering Information
Model
Temperature Range
Description
CLC5644IN
-40
C to +85
C
14-pin PDIP
CLC5644IM
-40
C to +85
C
14-pin SOIC
CLC5644IMX
-40
C to +85
C
14-pin tape and reel
Package Thermal Resistance
Package
JC
JA
Plastic (IN)
60
C/W
110
C/W
Surface Mount (IM)
55
C/W
125
C/W
3
http://www.national.com
CLC5644 Typical Performance
(A
v
= +2, R
f
= 1.65k
, R
L
= 100
, V
s
= +5V, unless specified)
Non-Inverting Frequency Response
Normalized Magnitude (0.5dB/div)
Frequency (Hz)
1M
10M
100M
Phase (deg)
-45
0
-90
-225
-135
-180
Gain
Phase
V
o
= 0.25V
pp
A
v
= +1
R
f
= 6.98k
A
v
= +2
R
f
= 1.65k
A
v
= +5
R
f
= 499
A
v
= +10
R
f
= 249
Inverting Frequency Response
Normalized Magnitude (0.5dB/div)
Frequency (Hz)
1M
10M
100M
Phase (deg)
-225
-180
-135
-90
-45
0
45
-270
-405
-315
-360
Gain
Phase
V
o
= 0.25V
pp
A
v
= -1
R
f
= 1.1k
A
v
= -2
R
f
= 887
A
v
= -5
R
f
= 422
A
v
= -10
R
f
= 294
Frequency Response vs. R
L
Magnitude (1dB/div)
Frequency (Hz)
1M
10M
100M
Phase (deg)
-90
0
-180
-450
-270
-360
Gain
Phase
V
o
= 5V
pp
R
L
= 25
R
L
= 100
R
L
= 1k
1000M
Frequency Response vs. V
o
Magnitude (1dB/div)
Frequency (Hz)
1M
10M
100M
V
o
= 2V
pp
V
o
= 4V
pp
V
o
= 0.1V
pp
V
o
= 1V
pp
2nd & 3rd Harmonic Distortion
Distortion (dBc)
Frequency (Hz)
1M
10M
V
o
= 2V
pp
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
2nd
R
L
= 1k
2nd
R
L
= 100
3rd
R
L
= 100
3rd
R
L
= 1k
2nd & 3rd Harmonic Distortion, R
L
= 25
Distortion (dBc)
Output Amplitude (V
pp
)
0
1
2
-80
-70
-60
-50
-40
-30
3rd = 1MHz
2nd = 1MHz
2nd = 10MHz
3rd = 10MHz
2nd & 3rd Harmonic Distortion, R
L
= 100
Distortion (dBc)
Output Amplitude (V
pp
)
0
1
2
-100
-90
-80
-70
-60
-50
3rd = 1MHz
2nd = 1MHz
2nd = 5MHz
3rd = 5MHz
2nd & 3rd Harmonic Distortion, R
L
= 1k
Distortion (dBc)
Output Amplitude (V
pp
)
0
1
2
-120
-110
-100
-90
-80
-70
-60
-50
3rd = 1MHz
2nd = 1MHz
2nd = 5MHz
3rd = 5MHz
Small Signal Pulse Response
Output Voltage (0.1V/div)
Time (20ns/div)
Large Signal Pulse Response
Output Voltage (0.1V/div)
Time (20ns/div)
Most Susceptible Channel Pulse Coupling
Active Amplitude (0.5V/div)
Inactive Amplitude (10mV/div)
Time (20ns/div)
Active Channel
Inactive Channel
Channel to Channel Gain Matching
Magnitude (0.5dB/div)
Frequency (Hz)
1M
10M
Phase (deg)
-45
0
-90
-225
-135
-180
Channel 1
100M
Channel 2
Channel 4
Channel 3
Equivalent Input Noise
Noise Voltage (nV/
Hz)
Frequency (Hz)
1k
100k
Noise Current (pA/
Hz)
10
100
1
10
100
1
Inverting Current = 10pA/
Hz
Voltage = 4.5nV/
Hz
Non-Inverting
Current = 1.5pA/
Hz
100M
100
10k
1M
10M
Open-Loop Transimpedance Gain, Z(s)
20 log[|V
o
/I
i
|/1
]
Frequency (Hz)
10k
1M
Phase (degrees)
0
20
40
60
80
100
120
140
160
180
200
30
40
50
60
70
80
90
100
110
120
130
Gain
100M
1k
100k
10M
Phase
PSRR and CMRR
PSRR, CMRR (dB)
Frequency (Hz)
100k
10
20
30
40
50
60
CMRR
100M
10k
1M
10M
PSRR
CLC5644
Lo
w-P
o
wer
,
L
o
w-Cost,
Quad Operational Amplifier
http://www.national.com
4
Customer Design Applications Support
National Semiconductor is committed to design excellence. For sales, literature and technical support, call the
National Semiconductor Customer Response Group at 1-800-272-9959 or fax 1-800-737-7018.
Life Support Policy
National's products are not authorized for use as critical components in life support devices or systems without the express written approval of
the president of National Semiconductor Corporation. As used herein:
1. Life support devices or systems are devices or systems which, a) are intended for surgical implant into the body, or b) support or
sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to
cause the failure of the life support device or system, or to affect its safety or effectiveness.
National Semiconductor
National Semiconductor
National Semiconductor
National Semiconductor
Corporation
Europe
Hong Kong Ltd.
Japan Ltd.
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Fax: (+49) 0-180-530 85 86
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said
circuitry and specifications.
N
Current Feedback Amplifiers
Some of the key features of current feedback
technology are:
s
Independence of AC bandwidth and voltage gain
s
Inherently stable at unity gain
s
Adjustable frequency response with R
f
s
High slew rate
s
Fast settling
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.
Equation 1
where:
A
v
is the closed loop DC voltage gain
R
f
is the feedback resistor
Z(j
) is the open loop transimpedance gain
The denominator of Equation 1 is approximately
equal to 1 at low frequencies. Near the -3dB corner
frequency, the interaction between R
f
and Z(j
)
dominates the circuit performance. The value of the
feedback resistor has a large affect on the circuits
performance. Increasing R
f
has the following affects:
s
Decreases loop gain
s
Decreases bandwidth
s
Reduces gain peaking
s
Lowers pulse response overshoot
s
Affects frequency response phase linearity
Layout Considerations
A proper printed circuit layout is essential for achieving
high frequency performance. National provides
evaluation boards for the CLC5644 (CLC730024 - DIP,
CLC730031 - 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:
s
Include 6.8
F tantalum and 0.1
F ceramic
capacitors on both supplies.
s
Place the 6.8
F capacitors within 0.75 inches of
the power pins.
s
Place the 0.1
F capacitors less than 0.1 inches
from the power pins.
s
Remove the ground plane under and around the
part, especially near the input and output pins to
reduce parasitic capacitance.
s
Minimize all trace lengths to reduce series
inductances.
s
Use flush-mount printed circuit board pins for
prototyping, never use high profile DIP sockets.
Active Filter Application Notes
OA-21 Simplified Component Pre-Distortion for High
Speed Active Filters
OA-26 Designing High-Speed Active Filters
OA-27 Low-Sensitivity, Lowpass Filter Design
OA-28 Low-Sensitivity, Bandpass Filter Design
with Tuning Method
OA-29 Low-Sensitivity, Highpass Filter Design
with Parasitic Compensation
V
V
A
1
R
Z j
o
i
v
f
=
+
( )
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ZIP