REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD8036/AD8037
and large-signal bandwidths and ultralow distortion. The
AD8036 achieves 66 dBc at 20 MHz, and 240 MHz small-
signal and 195 MHz large-signal bandwidths. The AD8036 and
AD8037's recover from 2
clamp overdrive within 1.5 ns.
These characteristics position the AD8036/AD8037 ideally for
driving as well as buffering flash and high resolution ADCs.
In addition to traditional output clamp amplifier applications,
the input clamp architecture supports the clamp levels as addi-
tional inputs to the amplifier. As such, in addition to static dc
clamp levels, signals with speeds up to 240 MHz can be applied
to the clamp pins. The clamp values can also be set to any
value within the output voltage range provided that V
H
is greater
that V
L
. Due to these clamp characteristics, the AD8036 and
AD8037 can be used in nontraditional applications such as a
full-wave rectifier, a pulse generator, or an amplitude modula-
tor. These novel applications are only examples of some of the
diverse applications which can be designed with input clamps.
The AD8036 is offered in chips, industrial (40
C to +85
C)
and military (55
C to +125
C) package temperature ranges
and the AD8037 in industrial. Industrial versions are available
in plastic DIP and SOIC; MIL versions are packaged in cerdip.
4 3 2 1 0 1 2 3 4
4
3
2
1
0
1
2
3
4
INPUT VOLTAGE Volts
OUTPUT VOLTAGE Volts
V
L
= 3V
V
L
= 2V
V
L
= 1V
V
H
= 1V
V
H
= 2V
V
H
= 3V
AD8036
Figure 1. Clamp DC Accuracy vs. Input Voltage
FEATURES
Superb Clamping Characteristics
3 mV Clamp Error
1.5 ns Overdrive Recovery
Minimized Nonlinear Clamping Region
240 MHz Clamp Input Bandwidth
3.9 V Clamp Input Range
Wide Bandwidth
AD8036
AD8037
Small Signal
240 MHz
270 MHz
Large Signal (4 V p-p) 195 MHz
190 MHz
Good DC Characteristics
2 mV Offset
10 V/ C Drift
Ultralow Distortion, Low Noise
72 dBc typ @ 20 MHz
4.5 nV/
Hz Input Voltage Noise
High Speed
Slew Rate 1500 V/ s
Settling 10 ns to 0.1%, 16 ns to 0.01%
3 V to 5 V Supply Operation
APPLICATIONS
ADC Buffer
IF/RF Signal Processing
High Quality Imaging
Broadcast Video Systems
Video Amplifier
Full Wave Rectifier
FUNCTIONAL BLOCK DIAGRAM
8-Lead Plastic DIP (N), Cerdip (Q),
and SO Packages
1
2
3
4
8
7
6
5
AD8036/
AD8037
NC
INPUT
+INPUT
V
S
+V
S
OUTPUT
(Top View)
NC = NO CONNECT
V
L
V
H
Low Distortion, Wide Bandwidth
Voltage Feedback Clamp Amps
PRODUCT DESCRIPTION
The AD8036 and AD8037 are wide bandwidth, low distortion
clamping amplifiers. The AD8036 is unity gain stable. The
AD8037 is stable at a gain of two or greater. These devices al-
low the designer to specify a high (V
CH
) and low (V
CL
) output
clamp voltage. The output signal will clamp at these specified
levels. Utilizing a unique patent pending CLAMPINTM input
clamp architecture, the AD8036 and AD8037 offer a 10
im-
provement in clamp performance compared to traditional out-
put clamping devices. In particular, clamp error is typically
3 mV or less and distortion in the clamp region is minimized.
This product can be used as a classical op amp or a clamp am-
plifier where a high and low output voltage are specified.
The AD8036 and AD8037, which utilize a voltage feedback ar-
chitecture, meet the requirements of many applications which
previously depended on current feedback amplifiers. The
AD8036 and AD8037 exhibit an exceptionally fast and accurate
pulse response (16 ns to 0.01%), extremely wide small-signal
CLAMPIN is a trademark of Analog Devices, Inc.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1999
AD8036/AD8037SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
REV. A
2
(
V
S
=
5 V; R
LOAD
= 100
; A
V
= +1 (AD8036); A
V
= +2 (AD8037), V
H
, V
L
open, unless
otherwise noted)
AD8036A
AD8037A
Parameter
Conditions
Min
Typ
Max
Min
Typ
Max
Units
DYNAMIC PERFORMANCE
Bandwidth (3 dB)
Small Signal
V
OUT
0.4 V p-p
150
240
200
270
MHz
Large Signal
1
8036, V
OUT
= 2.5 V p-p; 8037, V
OUT
= 3.5 V p-p 160
195
160
190
MHz
Bandwidth for 0.1 dB Flatness
V
OUT
0.4 V p-p
8036, R
F
= 140
; 8037, R
F
= 274
130
130
MHz
Slew Rate, Average +/
V
OUT
= 4 V Step, 1090%
900
1200
1100 1500
V/
s
Rise/Fall Time
V
OUT
= 0.5 V Step, 1090%
1.4
1.2
ns
V
OUT
= 4 V Step, 1090%
2.6
2.2
ns
Settling Time
To 0.1%
V
OUT
= 2 V Step
10
10
ns
To 0.01%
V
OUT
= 2 V Step
16
16
ns
HARMONIC/NOISE PERFORMANCE
2nd Harmonic Distortion
2 V p-p; 20 MHz, R
L
= 100
59
52
52
45
dBc
R
L
= 500
66
59
72
65
dBc
3rd Harmonic Distortion
2 V p-p; 20 MHz, R
L
= 100
68
61
70
63
dBc
R
L
= 500
72
65
80
73
dBc
3rd Order Intercept
25 MHz
+46
+41
dBm
Noise Figure
R
S
= 50
18
14
dB
Input Voltage Noise
1 MHz to 200 MHz
6.7
4.5
nV
Hz
Input Current Noise
1 MHz to 200 MHz
2.2
2.1
pA
Hz
Average Equivalent Integrated
Input Noise Voltage
0.1 MHz to 200 MHz
95
60
V rms
Differential Gain Error (3.58 MHz)
R
L
= 150
0.05
0.09
0.02
0.04
%
Differential Phase Error (3.58 MHz)
R
L
= 150
0.02
0.04
0.02
0.04
Degree
Phase Nonlinearity
DC to 100 MHz
1.1
1.1
Degree
CLAMP PERFORMANCE
Clamp Voltage Range
2
V
CH
or V
CL
3.3
3.9
3.3
3.9
V
Clamp Accuracy
2
Overdrive, V
CH
= +2 V, V
CL
= 2 V
3
10
3
10
mV
T
MIN
T
MAX
20
20
mV
Clamp Nonlinearity Range
3
100
100
mV
Clamp Input Bias Current (V
H
or V
L
)
8036, V
H, L
=
1 V; 8037, V
H, L
=
0.5 V
40
60
50
70
A
T
MIN
T
MAX
80
90
A
Clamp Input Bandwidth (3 dB)
V
CH
or V
CL
= 2 V p-p
150
240
180
270
MHz
Clamp Overshoot
2
Overdrive, V
CH
or V
CL
= 2 V p-p
1
5
1
5
%
Overdrive Recovery
2
Overdrive
1.5
1.3
ns
DC PERFORMANCE
4
,
R
L
= 150
Input Offset Voltage
5
2
7
2
7
mV
T
MIN
T
MAX
11
10
mV
Offset Voltage Drift
10
10
V/
C
Input Bias Current
4
10
3
9
A
T
MIN
T
MAX
15
15
A
Input Offset Current
0.3
3
0.1
3
A
T
MIN
T
MAX
5
5
A
Common-Mode Rejection Ratio
V
CM
=
2 V
66
90
70
90
dB
Open-Loop Gain
V
OUT
=
2.5 V
48
55
54
60
dB
T
MIN
T
MAX
40
46
dB
INPUT CHARACTERISTICS
Input Resistance
500
500
k
Input Capacitance
1.2
1.2
pF
Input Common-Mode Voltage Range
2.5
2.5
V
OUTPUT CHARACTERISTICS
Output Voltage Range, R
L
= 150
3.2
3.9
3.2
3.9
V
Output Current
70
70
mA
Output Resistance
0.3
0.3
Short Circuit Current
240
240
mA
POWER SUPPLY
Operating Range
3.0
5.0
6.0
3.0
5.0
6.0
V
Quiescent Current
20.5
21.5
18.5
19.5
mA
T
MIN
T
MAX
25
24
mA
Power Supply Rejection Ratio
T
MIN
T
MAX
50
60
56
66
d
B
NOTES
1
See Max Ratings and Theory of Operation sections of data sheet.
2
See Max Ratings.
3
Nonlinearity is defined as the voltage delta between the set input clamp voltage (V
H
or V
L
) and the voltage at which V
OUT
starts deviating from V
IN
(see Figure 73).
4
Measured at A
V
= 50.
5
Measured with respect to the inverting input.
Specific
ations subject to change without notice.
AD8036/AD8037
REV. A
3
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although these devices feature proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.6 V
Voltage Swing
Bandwidth Product . . . . . . . . . . . 350 V-MHz
|V
H
V
IN
| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 V
|V
L
V
IN
| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 V
Internal Power Dissipation
2
Plastic DIP Package (N) . . . . . . . . . . . . . . . . . . . . 1.3 Watts
Small Outline Package (SO) . . . . . . . . . . . . . . . . . . 0.9 Watts
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . .
V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . .
1.2 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Storage Temperature Range N, R . . . . . . . . . 65
C to +125
C
Operating Temperature Range (A Grade) . . . 40
C to +85
C
Lead Temperature Range (Soldering 10 sec) . . . . . . . . +300
C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
Specification is for device in free air:
8-Lead Plastic DIP:
JA
= 90
C/W
8-Lead SOIC:
JA
= 155
C/W
8-Lead Cerdip:
JA
= 110
C/W.
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by these de-
vices is limited by the associated rise in junction temperature.
The maximum safe junction temperature for plastic encapsu-
lated devices is determined by the glass transition temperature
of the plastic, approximately +150
C. Exceeding this limit tem-
porarily may cause a shift in parametric performance due to a
change in the stresses exerted on the die by the package. Exceed-
ing a junction temperature of +175
C for an extended period can
result in device failure.
While the AD8036 and AD8037 are internally short circuit pro-
tected, this may not be sufficient to guarantee that the maxi-
mum junction temperature (+150
C) is not exceeded under all
conditions. To ensure proper operation, it is necessary to ob-
serve the maximum power derating curves.
2.0
0
50
80
1.5
0.5
40
1.0
0
10
10
20
30
20 30
40
50
60
70
90
AMBIENT TEMPERATURE C
MAXIMUM POWER DISSIPATION Watts
T
J
= +150 C
8-LEAD PLASTIC DIP
PACKAGE
8-LEAD SOIC
PACKAGE
Figure 2. Plot of Maximum Power Dissipation vs.
Temperature
METALIZATION PHOTO
Dimensions shown in inches and (mm).
Connect Substrate to V
S
.
AD8036
8 0 3 6
AD8037
8 0 3 7
+IN
V
S
OUT
IN
+V
S
V
H
V
L
+IN
V
S
OUT
IN
+V
S
V
H
V
L
4
5
3
2
8
7
2
8
7
6
6
3
4
5
0.050 (1.27)
0.046
(1.17)
0.050 (1.27)
0.046
(1.17)
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Description
Option
AD8036AN
40
C to +85
C
Plastic DIP
N-8
AD8036AR
40
C to +85
C
SOIC
SO-8
AD8036AR-REEL
40
C to +85
C
13" Tape and Reel
SO-8
AD8036AR-REEL7 40
C to +85
C
7" Tape and Reel
SO-8
AD8036ACHIPS
40
C to +85
C
Die
AD8036-EB
Evaluation Board
5962-9559701MPA 55
C to +125
C Cerdip
Q-8
AD8037AN
40
C to +85
C
Plastic DIP
N-8
AD8037AR
40
C to +85
C
SOIC
SO-8
AD8037AR-REEL
40
C to +85
C
13" Tape and Reel
SO-8
AD8037AR-REEL7 40
C to +85
C
7" Tape and Reel
SO-8
AD8037ACHIPS
40
C to +85
C
Die
AD8037-EB
Evaluation Board
WARNING!
ESD SENSITIVE DEVICE
REV. A
4
AD8036/AD8037
+V
S
R
L
= 100
V
S
49.9
V
IN
R
F
130
V
OUT
0.1 F
10 F
AD8036
0.1 F
10 F
PULSE
GENERATOR
T
R
/T
F
= 350ps
Figure 3. Noninverting Configuration, G = +1
Figure 4. Large Signal Transient Response; V
O
= 4 V p-p,
G = +1, R
F
= 140
Figure 5. Small Signal Transient Response; V
O
= 400 mV
p-p, G = +1, R
F
= 140
AD8036Typical Characteristics
+V
S
R
L
= 100
V
S
49.9
V
IN
R
F
130
V
OUT
0.1 F
10 F
AD8036
0.1 F
10 F
PULSE
GENERATOR
T
R
/T
F
= 350ps
+V
H
V
L
0.1 F
0.1 F
Figure 6. Noninverting Clamp Configuration, G = +1
Figure 7. Clamped Large Signal Transient Response (2
Overdrive); V
O
= 2 V p-p, G = +1, R
F
= 140
, V
H
= +1 V,
V
L
= 1 V
Figure 8. Clamped Small Signal Transient Response
(2
Overdrive); V
O
= 400 mV p-p, G = +1, R
F
= 140
,
V
H
= +0.2 V, V
L
= 0.2 V
AD8036/AD8037
REV. A
5
AD8037Typical Characteristics
R
IN
+V
S
R
L
= 100
V
S
49.9
V
IN
R
F
100
V
OUT
0.1 F
10 F
AD8037
0.1 F
10 F
PULSE
GENERATOR
T
R
/T
F
= 350ps
+V
H
V
L
0.1 F
0.1 F
Figure 12. Noninverting Clamp Configuration, G = +2
Figure 13. Clamped Large Signal Transient Response
(2
Overdrive); V
O
= 2 V p-p, G = +2, R
F
=
R
IN
= 274
,
V
H
= +0.5 V, V
L
= 0.5 V
Figure 14. Clamped Small Signal Transient Response
(2
Overdrive); V
O
= 400 mV p-p, G = +2, R
F
= R
IN
= 274
,
V
H
= +0.1 V, V
L
= 0.1 V
R
IN
+V
S
R
L
= 100
V
S
49.9
V
IN
R
F
100
V
OUT
0.1 F
10 F
AD8037
0.1 F
10 F
PULSE
GENERATOR
T
R
/T
F
= 350ps
Figure 9. Noninverting Configuration, G = +2
Figure 10. Large Signal Transient Response; V
O
= 4 V p-p,
G = +2, R
F
= R
IN
= 274
Figure 11. Small Signal Transient Response;
V
O
= 400 mV p-p, G = +2, R
F
= R
IN
= 274
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