CLC502
Clamping, Low Gain Op Amp with Fast 14-bit Settling
General Description
The CLC502 is an operational amplifier designed for low
gain applications requiring output voltage clamping. This
feature allows the designer to set maximum positive and
negative output voltage levels for the amplifier thus allow-
ing the CLC502 to protect downstream circuitry, such as
delicate converter systems from destructive transients or
signals which would otherwise cause saturation. The over-
load recovery time of only 8ns permits systems to resume
operation quickly after overdrive.
High accuracy systems will also benefit from the CLC502's
fast, accurate settling. Settling to 0.0025% in 25ns (32ns
guaranteed over temperature), the CLC502 is ideal as the
input amplifier in high accuracy (12 bits and above) A/D
systems. Unlike most other high speed op amps, the
CLC502 is free of settling tails. And, as the settling plots
show, settling to 0.01% accuracy is an even faster 18ns
typical.
The CLC502 is also useful in other applications which re-
quire low gain amplification (
1 to
8) and the clamping or
overload recovery features. For example, even low resolu-
tion imaging circuits, which often have to cope with overload-
ing signal levels, can benefit from clamping and overload
recovery.
The CLC502 is available in several versions to meet a
variety of requirements. A three-letter suffix determines the
version:
Enhanced Solutions (Military/Aerospace)
SMD Number: 5962-91743
*
Space level versions also available.
*
For more information, visit http://www.national.com/mil
Features
n
Output clamping with fast recovery
n
0.0025% settling in 25ns (32ns max)
n
Low power, 170mW
n
Low distortion. -50dBc at 20MHz
Applications
n
Output clamping applications
n
High accuracy A/D systems (12-14 bits)
n
High accuracy D/A converters
n
Pulse amplitude modulation systems
Connection Diagram
Ordering Information
Package
Temperature Range
Industrial
Part Number
Package
Marking
NSC
Drawing
8-pin Plastic DIP
-40C to +85C
CLC502AJP
CLC502AJP
N08E
8-pin Plastic SOIC
-40C to +85C
CLC502AJE
CLC502AJE
M08A
Clamped Pulse Response (8x Overdrive)
DS012754-1
DS012754-2
Pinout
DIP & SOIC
January 2001
CLC502
Clamping,
Low
Gain
Op
Amp
with
Fast
14-bit
Settling
2001 National Semiconductor Corporation
DS012754
www.national.com
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 (Human Body Model)
1000V
Operating Ratings
Thermal Resistance
Package
JC
JA
MDIP
65C/W
120C/W
SOIC
60C/W
140C/W
Electrical Characteristics
(A
V
= +2, V
CC
=
5V, R
L
=100
, R
f
= 250
, V
H
= +3V, V
L
= -3V)
Symbol
Parameter
Conditions
Typ
Max/Min Ratings (Note 2)
Units
Ambient Temperature
CLC502AJ
+25C
-40C
+25C
+85C
Frequency Domain Performance
SSBW
-3dB Bandwidth
V
OUT
<
0.5V
PP
150
>
100
>
110
>
100
MHz
LSBW
V
OUT
<
5V
PP
65
>
40
>
40
>
40
MHz
Gain Flatness
V
OUT
<
0.5V
PP
GFPL
Peaking
DC to 25MHz
0
<
0.4
<
0.3
<
0.4
dB
GFPH
Peaking
>
25MHz
0
<
0.7
<
0.5
<
0.7
dB
GFR
Rolloff (Note 5)
DC to 50MHz
0.5
<
1.0
<
1.0
<
1.0
dB
LPD
Linear Phase Deviation
DC to 50MHz
0.4
<
1.2
<
1.0
<
1.2
deg
Time Domain Performance
TRS
Rise and Fall Time
0.5V Step
2.7
<
3.5
<
3.2
<
3.5
ns
TRL
5V Step
5.0
<
8
<
8
<
8
ns
TS14
Settling Time to
0.0025%
2V Step
25
<
32
<
32
<
32
ns
TSP
0.01%
2V Step
18
<
25
<
25
<
25
ns
TSS
0.1%
2V Step
10
<
15
<
15
<
15
ns
OS
Overshoot
0.5V Step
0
<
10
<
10
<
10
%
SR
Slew Rate
800
>
500
>
500
>
500
V/s
Distortion And Noise Performance
HD2
2nd Harmonic Distortion
2V
PP
, 20MHz
-50
<
-38
<
-43
<
-43
dBc
HD3
3rd Harmonic Distortion
2V
PP
, 20MHz
-60
<
-53
<
-53
<
-53
dBc
Equivalent Input Noise
SNF
Noise Floor
>
1MHz
-157
<
-155
<
-155
<
-155
dBm
(1Hz)
INV
Integrated Noise
1MHz to
150MHz
40
<
49
<
49
<
49
V
DG
Differential Gain (Note 4)
0.01
%
DP
Differential Phase (Note 4)
0.05
deg
Clamp performance
OVC
Overshoot in Clamp
2x Overdrive
5
<
10
%
TSO
Overload Recovery from Clamp
2x Overdrive
8
<
15
<
15
<
15
ns
VOC
Clamp Accuracy(Note 3)
2x Overdrive
0.2
<
0.3
<
0.3
<
0.3
V
ICL
Input Bias Current on V
H
, or V
L
20
<
75
<
35
<
35
A
CBW
-3dB Bandwidth
V
L
or V
H
=
2V
PP
50
MHz
CMC
Clamp Voltage Range
V
H
or V
L
<
3.0
<
3.3
<
3.3
V
Static, DC Performance
VIO
Input Offset Voltage (Note 3)
0.5
<
2.6
<
1.6
<
2.8
mV
CLC502
www.national.com
2
Electrical Characteristics
(Continued)
(A
V
= +2, V
CC
=
5V, R
L
=100
, R
f
= 250
, V
H
= +3V, V
L
= -3V)
Symbol
Parameter
Conditions
Typ
Max/Min Ratings (Note 2)
Units
Static, DC Performance
DVIO
Average Temperature
Coefficient
3
<
12
<
12
V/C
IBN
Input Bias Current (Note 3)
Non-Inverting
10
<
45
<
25
<
35
A
DIBN
Average Temperature
Coefficient
100
<
250
<
100
nA/C
IBI
Input Bias current (Note 3)
Inverting
10
<
50
<
30
<
40
A
DIBI
Average Temperature
Coefficient
100
<
250
<
100
nA/C
PSRR
Power Supply Rejection Ratio
68
>
55
>
60
>
60
dB
CMRR
Common Mode Rejection Ratio
65
>
55
>
60
>
60
dB
ICC
Supply Current (Note 3)
No Load
17
<
23
<
23
<
23
mA
Miscellaneous Performance
RIN
Non-Inverting Input
Resistance
150
>
50
>
85
>
85
k
CIN
Capacitance
35
<
5.5
<
5.5
<
5.5
pF
RO
Output Impedance
at DC
0.1
<
0.2
<
0.2
<
0.2
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
55
>
25
>
45
>
45
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. Outgoing quality levels are determined
from tested parameters.
Note 3: AJ-level: spec. is 100% tested at +25C.
Note 4: Differential gain and phase measure at A
v
= +2V, R = 250
Note 5: R
L
= 150
, 1V
PP
equivalent video signal, 0-100 IRE, 40 IRE
PP
0 IRE = 0 volts, at 75
load and 3.58 MHz
Typical Performance Characteristics
(T
A
= 25, A
V
= +2, V
CC
=
5V, R
L
= 100
, R
f
= 250
, V
H
=
+3V, V
L
= -3V)
Non-Inverting Frequency Response
DS012754-3
Inverting Frequency Response
DS012754-5
CLC502
www.national.com
3
Typical Performance Characteristics
(T
A
= 25, A
V
= +2, V
CC
=
5V, R
L
= 100
, R
f
= 250
, V
H
=
+3V, V
L
= -3V)) (Continued)
Frequency Response for Various R
L
s
DS012754-5
Open-Loop Transimpedance Gain, Z(s)
DS012754-6
2nd and 3rd Harmonic Distortion
DS012754-7
2-Tone, 3rd Order Intermodulation Intercept
DS012754-8
Equivalent Input Noise
DS012754-9
CMRR and PSRR
DS012754-10
CLC502
www.national.com
4
Typical Performance Characteristics
(T
A
= 25, A
V
= +2, V
CC
=
5V, R
L
= 100
, R
f
= 250
, V
H
=
+3V, V
L
= -3V)) (Continued)
Clamped Pulse Response (8x Overdrive)
DS012754-11
Settling, Clamped (4x overdrive)
DS012754-12
Long-Term Settling, Clamped (4x overdrive)
DS012754-13
Nonlinearity Near Clamp Voltage
DS012754-14
Settling, Umclamped
DS012754-15
Long-Term Settling, Unclamped
DS012754-16
CLC502
www.national.com
5
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