CLC501
High Speed, Output Clamping Op Amp
General Description
The CLC501 is a high speed current-feedback op amp with
the unique feature of output voltage clamping. This feature
allows both the maximum positive (V
HIGH
) and negative
(V
LOW
) output voltage levels to be established. This is useful
in a number of applications in which "downstream" circuitry
must be protected from over driving input signals. Not only
can this prevent damage to downstream circuitry, but can
also reduce time delays since saturation is avoided. The
CLC501's very fast 1ns overload/clamping recovery time is
useful in applications in which information containing signals
follow overdriving signals.
Engineers designing high resolution, subranging A/D sys-
tems have long sought an amplifier capable of meeting the
demanding requirements of the residue amplifier function.
Amplifiers providing the residue function must not only settle
quickly, but recover from overdrive quickly, protect the sec-
ond stage A/D, and provide high fidelity at relatively high gain
settings. The CLC501, which excels in these areas, is the
ideal design solution in this onerous application. To further
support this application, the CLC501 is both characterized
and tested at a gain setting of +32the most common gain
setting for residue amplifier applications.
The CLC501's other features provide a quick, high perfor-
mance design solution. Since the CLC501's current feed-
back design requires no external compensation, designers
need not spend their time designing compensation net-
works. The small 8-pin package and low, 180mW power
consumption make the CLC501 ideal in numerous applica-
tions having small power and size budgets.
The CLC501 is available in several versions to meet a
variety of requirements. A three letter suffix determines the
version:
Enhanced Solutions (Military/Aerospace)
SMD Number: 5962-94597
*
Space level version also available.
*
For more information, visit http://www.national.com/mil
Features
n
Output clamping (V
HIGH
and V
LOW
)
n
1ns recovery from clamping/overdrive
n
0.05% settling in 12ns
n
Characterized and guaranteed at A
V
= +32
n
Low power: 180mW
Applications
n
Residue amplifier in high accuracy, subranging A/D
systems
n
High speed communications
n
Output clamping applications
n
Pulse amplitude modulation systems
Connection Diagram
Clamped Pulse Response
DS012753-1
DS012753-3
Pinout
DIP & SOIC
DS012753-2
February 2001
CLC501
High
Speed,
Output
Clamping
Op
Amp
2001 National Semiconductor Corporation
DS012753
www.national.com
Ordering Information
Package
Temperature Range
Industrial
Part Number
Package
Marking
NSC
Drawing
8-Pin Plastic DIP
-40C to +85C
CLC501AJP
CLC501AJP
N08E
8-Pin Plastic SOIC
-40C to +85C
CLC501AJE
CLC501AJE
M08A
CLC501
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2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
)
7V
I
OUT
Output is short circuit protected to
ground, but maximum reliability will
be maintained if I
OUT
does not
exceed...
60mA
Common Mode Input Voltage
V
CC
Junction Temperature
+150C
Operating Temperature Range
-40C to +85C
Storage Temperature Range
-65C to +150C
Lead Solder Duration (+300C)
10 sec
ESD Rating (Human Body Model)
<
1000V
Recommended Gain Range
+7 to +50
-1 to -50
Operating Ratings
Thermal Resistance
Package
(
JC
)
(
JA
)
MDIP
70C/W
125C/W
SOIC
65C/W
145C/W
Electrical Characteristics
(A
V
= +32, V
CC
=
5 V, R
L
= 100
, R
f
= 1.5
, V
H
= +3V; unless specified)
Symbol
Parameters
Condition
Typ
Max & Min Ratings(Note 2)
Units
Ambient Temperature
CLC501AJ
+25C
-40C
+25C
+85C
Frequency Domain Response
SSBW
3dB Bandwidth
V
OUT
<
5V
PP
75
>
60
>
60
>
45
MHz
SS20
3dB Bandwidth
@
A
V
= +20, V
OUT
<
2V
PP
110
>
85
>
85
>
55
MHz
Gain Flatness
V
OUT
<
5V
PP
GFPL
Peaking
<
15MHz
0
<
0.1
<
0.1
<
0.1
dB
GFPH
Peaking
>
15MHz
0
<
0.2
<
0.2
<
0.2
dB
GFR
Rolloff
<
30MHz
0.2
<
1.0
<
1.0
<
1.3
dB
LPD
Linear Phase Deviation
DC to 30MHz
0.2
<
1.0
<
1.0
<
1.0
deg
Time Domain Response
TRS
Rise and Fall Time
2V Step
4.7
<
5.8
<
5.8
<
7.8
ns
TRL
5V Step
5.5
<
6.5
<
6.5
<
8.0
ns
TSP
Settling Time to
0.05%
2V Step
12
<
18
<
18
<
24
ns
OS
Overshoot
2V Step
0
<
5
<
5
<
5
%
SR
Slew Rate
1200
>
800
>
800
>
700
V/s
Distortion And Noise Response
HD2
2nd Harmonic Distortion
2V
PP
, 20MHz
-45
<
-30
<
-33
<
-30
dBc
HD3
3rd Harmonic Distortion
2V
PP
, 20MHz
-60
<
-45
<
-50
<
-50
dBc
Equivalent Input Noise
SNF
Noise Floor
>
1MHz
-158
<
-156
<
-156
<
-155
dBm
(1Hz)
INV
Integrated Noise
1MHZ to 100MHz
28
<
35
<
35
<
40
V
Clamp Performance
OVC
Overshoot in Clamp
32x Overdrive
5
<
15
%
TSO
Overload Recovery from Clamp
32x Overdrive
1
<
3
<
3
<
3
ns
CDR
V
io
Drift after Recovery
150
<
200
<
200
<
200
V
VOC
Clamp Accuracy(Note 3)
>
2x Overdrive
0.1
<
0.2
<
0.2
<
0.2
V
ICL
Input Bias Current on V
H
, V
L
20
<
100
<
50
<
50
A
CBW
3dB Bandwidth
V
L
,V
H
= 2V
PP
50
MHz
CMC
Useful Clamping Range
V
H
or V
L
<
3.0
<
3.3
<
3.3
V
Static, DC Performance
VIO
Input Offset Voltage(Note 3)
1.5
<
4.6
<
3.0
<
5.0
mV
DVIO
Average Temperature
Coefficient
10
<
20
<
20
V/C
IBN
Input Bias Current(Note 3)
Non-Inverting
10
<
37
<
25
<
35
A
CLC501
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3
Electrical Characteristics
(Continued)
(A
V
= +32, V
CC
=
5 V, R
L
= 100
, R
f
= 1.5
, V
H
= +3V; unless specified)
Symbol
Parameters
Condition
Typ
Max & Min Ratings(Note 2)
Units
Static, DC Performance
DIBN
Average Temperature
Coefficient
100
<
150
<
100
nA/C
IBI
Input Bias Current(Note 3)
Inverting
10
<
46
<
30
<
40
A
DIBI
Average Temperature
Coefficient
100
<
200
<
100
nA/C
PSRR
Power Supply Rejection Ratio
70
>
55
>
60
>
60
dB
CMRR
Common Mode Rejection Ratio
70
>
55
>
60
>
60
dB
ICC
Supply Current(Note 3)
No Load
18
<
25
<
24
<
24
mA
Miscellaneous Performance
RIN
Non-Inverting Input
Resistance
150
>
50
>
100
>
100
k
CIN
Capacitance
4
<
7
<
7
<
7
pF
RO
Output Impedance
at DC
0.2
<
0.3
<
0.3
<
0.3
CMIR
Common Mode Input Range
3.0
>
2.0
>
2.5
>
2.5
V
VO
Output Voltage Range
No Load
3.5V
>
3.0
>
3.2
>
3.2
V
IO
Output Current
-40C to +85C
60
>
35
>
50
>
50
mA
IO
-55C to +125C
60
>
30
>
50
>
50
mA
Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of "Electrical Characteristics" specifies conditions of device operation.
Note 2: Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Individual parameters are tested as
noted. Outgoing quality levels are determined from tested parameters.
Note 3: AJ 100% tested at +25C, sample at +85C
Typical Performance Characteristics
(T
A
= 25, A
V
= +32, V
CC
=
5V, R
L
= 100
, R
f
= 1.5
, V
H
=
+3V, V
L
= -3V)
Non-Inverting Frequency Response
DS012753-4
Inverting Frequency Response
DS012753-5
CLC501
www.national.com
4
Typical Performance Characteristics
(T
A
= 25, A
V
= +32, V
CC
=
5V, R
L
= 100
, R
f
= 1.5
, V
H
=
+3V, V
L
= -3V)) (Continued)
Frequency Response for R
L
S
DS012753-6
Open-Loop Transimpedance Gain, Z(s)
DS012753-7
2nd and 3rd Harmonic Distortion
DS012753-8
2-Tone, 3rd Order, Intermodulation Intercept
DS012753-9
Equivalent Input Noise
DS012753-10
CMRR and PSRR
DS012753-11
CLC501
www.national.com
5
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