a
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
PRODUCT DESCRIPTION
Low Distortion, Wide Bandwidth
Voltage Feedback Clamp Amps
AD8036/AD8037
FUNCTIONAL BLOCK DIAGRAM
8-Lead Plastic DIP (N), Cerdip (Q),
and SO Packages
NC
–INPUT
+INPUT
–V
S
1
2
3
4
(Top View)
NC = NO CONNECT
AD8036/
AD8037
8
7
6
5
V
H
+V
S
OUTPUT
V
L
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 character-
istics 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 modulator. 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
AD8036
3
OUTPUT VOLTAGE – Volts
2
1
0
V
L
= –1V
–1
–2
–3
V
L
= –2V
V
L
= –3V
V
H
= 3V
V
H
= 2V
V
H
= 1V
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
allow 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 CLAMPIN™ input
clamp architecture, the AD8036 and AD8037 offer a 10×
improvement in clamp performance compared to traditional
output 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
amplifier where a high and low output voltage are specified.
The AD8036 and AD8037, which utilize a voltage feedback
architecture, 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 and
CLAMPIN is a trademark of Analog Devices, Inc.
–4
–4
–3
–2
–1
0
1
INPUT VOLTAGE – Volts
2
3
4
REV. B
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.
Figure 1. Clamp DC Accuracy vs. Input Voltage
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., 2000
AD8036/AD8037–SPECIFICATIONS
= 100
( V = 5 V; R
ELECTRICAL CHARACTERISTICS
otherwise noted)
Parameter
DYNAMIC PERFORMANCE
Bandwidth (–3 dB)
Small Signal
Large Signal
1
Bandwidth for 0.1 dB Flatness
Slew Rate, Average +/–
Rise/Fall Time
Settling Time
To 0.1%
To 0.01%
HARMONIC/NOISE PERFORMANCE
2nd Harmonic Distortion
3rd Harmonic Distortion
3rd Order Intercept
Noise Figure
Input Voltage Noise
Input Current Noise
Average Equivalent Integrated
Input Noise Voltage
Differential Gain Error (3.58 MHz)
Differential Phase Error (3.58 MHz)
Phase Nonlinearity
CLAMP PERFORMANCE
Clamp Voltage Range
2
Clamp Accuracy
Clamp Nonlinearity Range
3
Clamp Input Bias Current (V
H
or V
L
)
Clamp Input Bandwidth (–3 dB)
Clamp Overshoot
Overdrive Recovery
DC PERFORMANCE
4
, R
L
= 150
Ω
Input Offset Voltage
5
Offset Voltage Drift
Input Bias Current
T
MIN
–T
MAX
Input Offset Current
Common-Mode Rejection Ratio
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
OUTPUT CHARACTERISTICS
Output Voltage Range, R
L
= 150
Ω
Output Current
Output Resistance
Short Circuit Current
POWER SUPPLY
Operating Range
Quiescent Current
Power Supply Rejection Ratio
T
MIN
–T
MAX
T
MIN
–T
MAX
T
MIN
–T
MAX
V
CM
=
±
2 V
V
OUT
=
±
2.5 V
T
MIN
–T
MAX
Conditions
S
LOAD
; A
V
= +1 (AD8036); A
V
= +2 (AD8037), V
H
, V
L
open, unless
AD8036A
Min Typ Max
AD8037A
Min Typ Max
Unit
150
V
OUT
≤
0.4 V p-p
8036, V
OUT
= 2.5 V p-p; 8037, V
OUT
= 3.5 V p-p 160
V
OUT
≤
0.4 V p-p
8036, R
F
= 140
Ω;
8037, R
F
= 274
Ω
900
V
OUT
= 4 V Step, 10–90%
V
OUT
= 0.5 V Step, 10–90%
V
OUT
= 4 V Step, 10–90%
V
OUT
= 2 V Step
V
OUT
= 2 V Step
2 V p-p; 20 MHz, R
L
= 100
Ω
R
L
= 500
Ω
2 V p-p; 20 MHz, R
L
= 100
Ω
R
L
= 500
Ω
25 MHz
R
S
= 50
Ω
1 MHz to 200 MHz
1 MHz to 200 MHz
0.1 MHz to 200 MHz
R
L
= 150
Ω
R
L
= 150
Ω
DC to 100 MHz
V
CH
or V
CL
2× Overdrive, V
CH
= +2 V, V
CL
= –2 V
T
MIN
–T
MAX
8036, V
H, L
=
±
1 V; 8037, V
H, L
=
±
0.5 V
T
MIN
–T
MAX
V
CH
or V
CL
= 2 V p-p
2× Overdrive, V
CH
or V
CL
= 2 V p-p
2× Overdrive
±
3.3
240
195
130
1200
1.4
2.6
10
16
–59
–66
–68
–72
46
18
6.7
2.2
95
0.05
0.02
1.1
±
3.9
±
3
100
±
40
–52
–59
–61
–65
200
160
270
190
MHz
MHz
MHz
V/µs
ns
ns
ns
ns
–45
–65
–63
–73
dBc
dBc
dBc
dBc
dBm
dB
nV√Hz
pA√Hz
µV
rms
%
Degree
Degree
V
mV
mV
mV
µA
µA
MHz
%
ns
mV
mV
µV/°C
µA
µA
µA
µA
dB
dB
dB
kΩ
pF
V
V
mA
Ω
mA
V
mA
mA
d
B
130
1100 1500
1.2
2.2
10
16
–52
–72
–70
–80
41
14
4.5
2.1
60
0.02
0.02
1.1
0.09
0.04
0.04
0.04
±
10
±
20
±
60
±
80
5
150
240
1
1.5
2
±
3.3
±
3.9
±
3
±
10
±
20
100
±
50
±
70
±
90
180 270
1
5
1.3
2
±
10
3
0.1
70
54
46
90
60
7
10
9
15
3
5
T
MIN
–T
MAX
±
10
4
0.3
66
48
40
90
55
7
11
10
15
3
5
500
1.2
±
2.5
±
3.2
±
3.9
70
0.3
240
±
5.0
20.5
60
±
6.0
21.5
25
500
1.2
±
2.5
±
3.2
±
3.9
70
0.3
240
±
3.0
±
5.0
±
6.0
18.5 19.5
24
56
66
±
3.0
50
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.
–2–
REV. B
AD8036/AD8037
ABSOLUTE MAXIMUM RATINGS
1
MAXIMUM POWER DISSIPATION
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:
θ
JA
= 90°C/W
8-Lead SOIC:
θ
JA
= 155°C/W
8-Lead Cerdip:
θ
JA
= 110°C/W.
The maximum power that can be safely dissipated by these
devices is limited by the associated rise in junction temperature.
The maximum safe junction temperature for plastic encapsulated
devices is determined by the glass transition temperature of the
plastic, approximately 150°C. Exceeding this limit temporarily
may cause a shift in parametric performance due to a change
in the stresses exerted on the die by the package. Exceeding
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 observe
the maximum power derating curves.
2.0
MAXIMUM POWER DISSIPATION – Watts
8-LEAD PLASTIC DIP
PACKAGE
T
J
= +150 C
1.5
1.0
METALIZATION PHOTO
Dimensions shown in inches and (mm).
Connect Substrate to –V
S
.
–IN
V
H
8
+V
S
7
0.5
8-LEAD SOIC
PACKAGE
2
0
–50 –40 –30 –20 –10 0 10 20 30 40 50 60
AMBIENT TEMPERATURE – C
0.046
(1.17)
70
80 90
6
OUT
Figure 2. Plot of Maximum Power Dissipation vs.
Temperature
ORDERING GUIDE
3
4
5
8036
AD8036
+V
S
7
Model
AD8036AN
AD8036AR
AD8036AR-REEL
AD8036AR-REEL7
AD8036ACHIPS
AD8036-EB
5962-9559701MPA
AD8037AN
AD8037AR
AD8037AR-REEL
AD8037AR-REEL7
AD8037ACHIPS
AD8037-EB
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
Description
Package
Option
N-8
SO-8
SO-8
SO-8
+IN
–V
S
V
L
0.050 (1.27)
–IN
2
V
H
8
Plastic DIP
SOIC
13" Tape and Reel
7" Tape and Reel
Die
Evaluation Board
–55°C to +125°C Cerdip
Plastic DIP
SOIC
13" Tape and Reel
7" Tape and Reel
Die
Evaluation Board
Q-8
N-8
SO-8
SO-8
SO-8
0.046
(1.17)
6
OUT
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
3
4
5
8037
AD8037
+IN
–V
S
V
L
0.050 (1.27)
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
the AD8036/AD8037 features 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.
WARNING!
ESD SENSITIVE DEVICE
REV. B
–3–
AD8036/AD8037
AD8036–Typical Characteristics
R
F
10 F
+V
H
0.1 F
PULSE
GENERATOR
T
R
/T
F
= 350ps
130
V
IN
49.9
0.1 F
+V
S
0.1 F
R
F
10 F
+V
S
PULSE
GENERATOR
T
R
/T
F
= 350ps
AD8036
0.1 F
10 F
–V
S
V
OUT
R
L
= 100
V
IN
49.9
130
AD8036
0.1 F
V
OUT
R
L
= 100
0.1 F
V
L
–V
S
10 F
TPC 1. Noninverting Configuration, G = +1
TPC 4. Noninverting Clamp Configuration, G = +1
TPC 2. Large Signal Transient Response; V
O
= 4 V
p-p, G = +1, R
F
= 140
Ω
TPC 5. Clamped Large Signal Transient Response (2
×
Overdrive); V
O
= 2 V p-p, G = +1, R
F
= 140
Ω
, V
H
= +1 V,
V
L
= –1 V
TPC 3. Small Signal Transient Response; V
O
= 400 mV p-p,
G = +1, R
F
= 140
Ω
TPC 6. Clamped Small Signal Transient Response
(2
×
Overdrive); V
O
= 400 mV p-p, G = +1, R
F
= 140
Ω
,
V
H
= +0.2 V, V
L
= –0.2 V
–4–
REV. B
AD8036/AD8037
AD8037–Typical Characteristics
R
F
PULSE
GENERATOR
T
R
/T
F
= 350ps
R
IN
10 F
R
F
PULSE
GENERATOR
T
R
/T
F
= 350ps
R
IN
10 F
+V
H
0.1 F
+V
S
0.1 F
+V
S
0.1 F
100
V
IN
49.9
AD8037
0.1 F
10 F
–V
S
V
OUT
R
L
= 100
100
V
IN
49.9
0.1 F
V
L
AD8037
0.1 F
10 F
–V
S
V
OUT
R
L
= 100
TPC 7. Noninverting Configuration, G = +2
TPC 10. Noninverting Clamp Configuration, G = +2
TPC 8. Large Signal Transient Response; V
O
= 4 V p-p,
G = +2, R
F
= R
IN
= 274
Ω
TPC 11. Clamped Large Signal Transient Response
(2
×
Overdrive); V
O
= 2 V p-p, G = +2, R
F
= R
IN
= 274
Ω
, V
H
= +0.5 V, V
L
= –0.5 V
TPC 9. Small Signal Transient Response;
V
O
= 400 mV p-p, G = +2, R
F
= R
IN
= 274
Ω
TPC 12. Clamped Small Signal Transient Response
(2
×
Overdrive); V
O
= 400 mV p-p, G = +2, R
F
= R
IN
=
274
Ω
, V
H
= +0.1 V, V
L
= –0.1 V
REV. B
–5–
嵌入式系统
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