Analog Devices AD8037, AD8036 Datasheet

–4 –3 –2 –1 0 1 2 3 4

4

3

2

1

0

–1

–2

–3

–4

INPUT VOLTAGE – Volts

OUTPUT VOLTAGE – Volts

VL = –3V

VL = –2V

VL = –1V

VH = 1V

VH = 2V

VH = 3V

AD8036

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

a

Voltage Feedback Clamp Amps

AD8036/AD8037

FEATURES
Superb Clamping Characteristics

3 mV Clamp Error

1.5 ns Overdrive Recovery
Minimized Nonlinear Clamping Region
240 MHz Clamp Input Bandwidth
ⴞ3.9 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/ⴗC 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%

ⴞ3 V to ⴞ5 V Supply Operation

APPLICATIONS

ADC Buffer
IF/RF Signal Processing
High Quality Imaging
Broadcast Video Systems
Video Amplifier
Full Wave Rectifier

and large-signal bandwidths and ultralow distortion. The
AD8036 achieves –66 dBc at 20 MHz, and 240 MHz small­signal 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 addi­tional 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
that V
AD8037 can be used in nontraditional applications such as a
full-wave rectifier, a pulse generator, or an amplitude modula-

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 al­low the designer to specify a high (V

) and low (VCL) output

CH

clamp voltage. The output signal will clamp at these specified

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.

levels. Utilizing a unique patent pending CLAMPIN™ input

clamp architecture, the AD8036 and AD8037 offer a 10× im-

provement 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

CLAMPIN is a trademark of Analog Devices, Inc.

FUNCTIONAL BLOCK DIAGRAM

8-Lead Plastic DIP (N), Cerdip (Q),

and SO Packages

is greater

. Due to these clamp characteristics, the AD8036 and

L

H

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.

Figure 1. Clamp DC Accuracy vs. Input Voltage

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1999

AD8036/AD8037–SPECIFICATIONS

(±VS = ±5 V; R

ELECTRICAL CHARACTERISTICS

Parameter Conditions Min Typ Max Min Typ Max Units

DYNAMIC PERFORMANCE

Bandwidth (–3 dB)

Small Signal V
Large Signal

1

Bandwidth for 0.1 dB Flatness V

Slew Rate, Average +/– V
Rise/Fall Time V

Settling Time

To 0.1% V
To 0.01% V

HARMONIC/NOISE PERFORMANCE

2nd Harmonic Distortion 2 V p-p; 20 MHz, R

3rd Harmonic Distortion 2 V p-p; 20 MHz, R

3rd Order Intercept 25 MHz +46 +41 dBm
Noise Figure R

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 µV rms

Differential Gain Error (3.58 MHz) R
Differential Phase Error (3.58 MHz) R
Phase Nonlinearity DC to 100 MHz 1.1 1.1 Degree

CLAMP PERFORMANCE

Clamp Voltage Range

2

Clamp Accuracy 2× Overdrive, V

Clamp Nonlinearity Range
Clamp Input Bias Current (V

3

or VL) 8036, V

H

Clamp Input Bandwidth (–3 dB) V

Clamp Overshoot 2× Overdrive, V
Overdrive Recovery 2× Overdrive 1.5 1.3 ns

4,

R

DC PERFORMANCE

Input Offset Voltage

5

= 150 Ω

L

Offset Voltage Drift ±10 ± 10 µV/°C
Input Bias Current 410 39µA

Input Offset Current 0.3 3 0.1 3 µA

Common-Mode Rejection Ratio V
Open-Loop Gain V

INPUT CHARACTERISTICS

Input Resistance 500 500 kΩ

Input Capacitance 1.2 1.2 pF

Input Common-Mode Voltage Range ±2.5 ± 2.5 V

OUTPUT CHARACTERISTICS

Output Voltage Range, R

= 150 Ω±3.2 ±3.9 ± 3.2 ±3.9 V

L

Output Current 70 70 mA

Output Resistance 0.3 0.3 Ω

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

Power Supply Rejection Ratio T

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 (VH or VL) and the voltage at which V

4

Measured at AV = 50.

5

Measured with respect to the inverting input.

ations subject to change without notice.

Specific

OUT

8036, V

OUT

8036, R

OUT

OUT

V

OUT

OUT

OUT

R

L

R

L

S

L

L

VCH or V

T

MIN–TMAX

T

MIN–TMAX

CH

T

MIN–TMAX

T

MIN–TMAX

T

MIN–TMAX

CM

OUT

T

MIN–TMAX

T

MIN–TMAX

MIN–TMAX

otherwise noted)

≤ 0.4 V p-p 150 240 200 270 MHz

= 2.5 V p-p; 8037, V

OUT

≤ 0.4 V p-p

= 140 Ω; 8037, RF = 274 Ω 130 130 MHz

F

= 4 V Step, 10–90% 900 1200 1100 1500 V/µs

= 0.5 V Step, 10–90% 1.4 1.2 ns
= 4 V Step, 10–90% 2.6 2.2 ns

= 2 V Step 10 10 ns
= 2 V Step 16 16 ns

= 100 Ω –59 –52 –52 –45 dBc

= 500 Ω –66 –59 –72 –65 dBc
= 500 Ω –72 –65 –80 –73 dBc
= 50 Ω 18 14 dB

= 150 Ω 0.05 0.09 0.02 0.04 %
= 150 Ω 0.02 0.04 0.02 0.04 Degree

CL

H, L

or V

CL

= ±2 V 66 90 70 90 dB

= ±2.5 V 48 55 54 60 dB

L

= 100 Ω –68 –61 –70 –63 dBc

L

= +2 V, V

CH

= ±1 V; 8037, V

= 2 V p-p 150 240 180 270 MHz

or VCL = 2 V p-p 1 5 1 5 %

CH

= 100 Ω; A

LOAD

= +1 (AD8036); AV = +2 (AD8037), VH, VL open, unless

V

AD8036A AD8037A

= 3.5 V p-p 160 195 160 190 MHz

OUT

±3.3 ±3.9 ±3.3 ± 3.9 V

= –2 V ±3 ± 10 ±3 ±10 mV

CL

±20 ±20 mV

100 100 mV

= ±0.5 V ±40 ±60 ±50 ± 70 µA

H, L

±80 ±90 µA

27 27mV

11 10 mV

15 15 µA
55µA

40 46 dB

25 24 mA

50 60 56 66

starts deviating from VIN (see Figure 73).

OUT

d

B

REV. A–2–

AD8036/AD8037

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

1

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.6 V

Voltage Swing × Bandwidth Product . . . . . . . . . . . 350 V-MHz

|V
|V
Internal Power Dissipation

| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 6.3 V

H–VIN

| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .≤ 6.3 V

L–VIN

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 perma­nent 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: θJA = 90°C/W
8-Lead SOIC: θJA = 155°C/W
8-Lead Cerdip: θJA = 110°C/W.

METALIZATION PHOTO

Dimensions shown in inches and (mm).

Connect Substrate to –V

–IN

2

V

.

S

+V

H

8

S

7

MAXIMUM POWER DISSIPATION

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 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 pro­tected, 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

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION – Watts

0

–50 80

–40

8-LEAD PLASTIC DIP

PACKAGE

8-LEAD SOIC

PACKAGE

010–10–20–30 20 30 40 50 60 70 90

AMBIENT TEMPERATURE – 8C

TJ = +1508C

0.046
(1.17)

OUT

6

Figure 2. Plot of Maximum Power Dissipation vs.

Temperature

ORDERING GUIDE

45

3

+IN –V

S

0.050 (1.27)

–IN

2

8036

AD8036

V

L

V

H

87

+V

S

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°CDie

Temperature Package Package

AD8036-EB Evaluation Board

5962-9559701MPA –55°C to +125°C Cerdip Q-8

0.046
(1.17)

OUT

6

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°CDie

AD8037-EB Evaluation Board

3

45

+IN –V

S

0.050 (1.27)

8037

AD8037

V

L

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.

REV. A –3–

AD8036/AD8037

+V

S

RL = 100V

–V

S

49.9V

V

IN

R

F

130V

V

OUT

0.1mF

10mF

AD8036

0.1mF

10mF

PULSE

GENERATOR

TR/T

F

= 350ps

+V

H

V

L

0.1mF

0.1mF

AD8036–Typical Characteristics

R

F

10mF

S

0.1mF

0.1mF

10mF

S

PULSE

GENERATOR

TR/T

= 350ps

F

V

IN

49.9V

130V

+V

AD8036

–V

V

RL = 100V

OUT

Figure 3. Noninverting Configuration, G = +1

Figure 4. Large Signal Transient Response; VO = 4 V p-p,
G = +1, R

= 140

F

Ω

Figure 6. Noninverting Clamp Configuration, G = +1

Figure 7. Clamped Large Signal Transient Response (2
Overdrive); VO = 2 V p-p, G = +1, RF = 140 Ω, VH = +1 V,
V

= –1 V

L

×

Figure 5. Small Signal Transient Response; VO = 400 mV
p-p, G = +1, R

F

= 140

Ω

Figure 8. Clamped Small Signal Transient Response
(2

×

Overdrive); VO = 400 mV p-p, G = +1, RF = 140 Ω,

V

= +0.2 V, VL = –0.2 V

H

REV. A–4–

AD8037–Typical Characteristics

R

IN

+V

S

RL = 100V

–V

S

49.9V

V

IN

R

F

100V

V

OUT

0.1mF

10mF

AD8037

0.1mF

10mF

PULSE

GENERATOR

TR/T

F

= 350ps

+V

H

V

L

0.1mF

0.1mF

R

F

PULSE

GENERATOR

TR/T

= 350ps

F

+V

R

IN

10mF

S

0.1mF

AD8036/AD8037

V

IN

100V

49.9V

AD8037

–V

S

0.1mF

10mF

V

RL = 100V

OUT

Figure 9. Noninverting Configuration, G = +2

Figure 10. Large Signal Transient Response; VO = 4 V p-p,
G = +2, R

= RIN = 274

F

Ω

Figure 12. Noninverting Clamp Configuration, G = +2

Figure 13. Clamped Large Signal Transient Response
(2

×

Overdrive); VO = 2 V p-p, G = +2, RF = RIN = 274 Ω,

V

= +0.5 V, VL = –0.5 V

H

Figure 11. Small Signal Transient Response;
V

REV. A –5–

= 400 mV p-p, G = +2, RF = RIN = 274

O

Ω

Figure 14. Clamped Small Signal Transient Response
(2

×

Overdrive); VO = 400 mV p-p, G = +2, RF = R

V

= +0.1 V, VL = –0.1 V

H

= 274 Ω,

IN

AD8036/AD8037

VALUE OF FEEDBACK RESISTOR (RF) – V

–3dB BANDWIDTH – MHz

20 24040 200 2201801601401201008060

R PACKAGE

R

F

130V

AD8036

VS = 65V
R

L

= 100V

GAIN = +1

R

L

49.9V

N PACKAGE

400

350

300

250

200

OUTPUT – dB

1M

FREQUENCY – Hz

10M

100M 1G

250V

RF = 50V

TO

250V

BY

50V

50V

VS = 65V
V

O

= 2.5V

p-p

R

L

= 100V

–8

–7

–6

–5

–4

–3

–2

–1

0

1

2

FREQUENCY – Hz

GAIN – dB

1M 10M

100M 1G

100k

VS = 65V
V

O

= 300mV

p-p

RL = 100V

–8

–7

–6

–5

–4

–3

–2

–1

0

1

2

140V

V

H

100V

VL (VIN)

(VO)

1V

AD8036

AD8036–Typical Characteristics

2

1

0

–1

–2

–3

GAIN – dB

–4

–5

–6

–7

–8

1M

VO = 300mV p-p
V

= 65V

S

= 100V

R

L

10M

102V

49.9V

FREQUENCY – Hz

100M 1G

200V

140V

Figure 15. AD8036 Small Signal Frequency Response,
G = +1

0.2

0.1

–0.1

–0.2

–0.3

GAIN – dB

–0.4

–0.5

–0.6

–0.7

–0.8

Figure 16. AD8036 0.1 dB Flatness, N Package (for R
Package Add 20

90
80

70
60
50
40
30

Figure 17. AD8036 Open-Loop Gain and Phase Margin vs.
Frequency, R

20

OPEN -LOOP GAIN – dB

10

–10
–20

0

VO = 300mV p-p
V

= 65V

S

= 100V

R

L

1M

0

10k 100k 10M1M

= 100

L

10M

Ω

to RF)

GAIN

Ω

140V

130V

FREQUENCY – Hz

FREQUENCY – Hz

158V

150V

100M 1G

PHASE

100M 1G

100
80
60
40
20
0
–20
–40
–60

PHASE MARGIN – Degrees

–80
–100

–120

Figure 18. AD8036 Small Signal –3 dB Bandwidth vs. R

Figure 19. AD8036 Large Signal Frequency Response,
G = +1

Figure 20. AD8036 Clamp Input Bandwidth, VH, V

L

REV. A–6–

F

–30

DIFF GAIN – %

1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th

DIFF PHASE – Degrees

1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th

0.04

0.02

0.00

–0.02

–0.04

0.04

0.02

0.00
–0.02
–0.04

0.06

–0.06

SETTLING TIME – ns

0 5 10 15 20 25 30 35 40 45

ERROR – %

–0.05

–0.04

–0.03

–0.02

–0.01

0

0.01

0.02

0.03

0.04

0.05

SETTLING TIME - ms

0 2 4 6 8 10 12 14 16 18

ERROR – %

–0.6

–0.5

–0.4

–0.3

–0.2

–0.1

0

0.1

0.2

0.3

0.4

–50

–70

VO = 2V p-p

= 65V

V

S

= 500V

R

L

G = +1

AD8036/AD8037

–90

–110

HARMONIC DISTORTION – dBc

–130

100k 100M10M1M10k

2ND HARMONIC

3RD HARMONIC

FREQUENCY – Hz

Figure 21. AD8036 Harmonic Distortion vs. Frequency,
R

= 500

L

Ω

–30

VO = 2V p-p
V

= 65V

S

RL = 100V

–50

G = +1

–70

–90

HARMONIC DISTORTION – dBc

–110

–130

100k 100M10M1M10k

FREQUENCY – Hz

2ND HARMONIC

3RD HARMONIC

Figure 24. AD8036 Differential Gain and Phase Error,
G = +1, R

= 150 Ω, F = 3.58 MHz

L

Figure 22. AD8036 Harmonic Distortion vs. Frequency,
R

= 100

L

Figure 23. AD8036 Third Order Intercept vs. Frequency

REV. A –7–

Ω

60

50

40

INTERCEPT – +dBm

30

20

10

20 40 8060

FREQUENCY – MHz

100

Figure 25. AD8036 Short-Term Settling Time to 0.01%, 2 V
Step, G = +1, R

= 100

L

Ω

Figure 26. AD8036 Long-Term Settling Time, 2 V Step,

G = +1, R

= 100

L

Ω