Analog Devices AD8037-EB, AD8036AR-REEL7, AD8036AR-REEL, AD8036AR, AD8036AN Datasheet

a		Low Distortion, Wide Bandwidth
		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

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

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 (VCH) and low (VCL) 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.

FUNCTIONAL BLOCK DIAGRAM

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

and SO Packages

NC	1	AD8036/	8	VH
–INPUT	2	AD8037	7	+VS
+INPUT	3		6	OUTPUT
–VS	4	(Top View)	5	VL

NC = NO CONNECT

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 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 VH is greater that VL. 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						VH = 3V
	3
– Volts	2							VH = 2V
	1							VH = 1V
VOLTAGE
	0
		VL = –1V
OUTPUT	–1
	VL = –2V
	–2
	VL = –3V
	–3
	–4	–3	–2	–1	0	1	2	3	4
	–4
				INPUT VOLTAGE – Volts

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: [phone]	World Wide Web Site: http://www.analog.com
Fax: [phone]	© Analog Devices, Inc., 2000

AD8036/AD8037–SPECIFICATIONS

	( VS = 5 V; RLOAD = 100 ; AV = +1 (AD8036); AV = +2 (AD8037), VH, VL open, unless
ELECTRICAL CHARACTERISTICS otherwise noted)
		AD8036A			AD8037A
Parameter	Conditions	Min	Typ	Max	Min	Typ	Max	Unit
DYNAMIC PERFORMANCE
Bandwidth (–3 dB)	VOUT ≤ 0.4 V p-p	150	240		200	270		MHz
Small Signal
Large Signal1	8036, VOUT = 2.5 V p-p; 8037, VOUT = 3.5 V p-p	160	195		160	190		MHz
Bandwidth for 0.1 dB Flatness	VOUT ≤ 0.4 V p-p
	8036, RF = 140 Ω; 8037, RF = 274 Ω		130			130		MHz
Slew Rate, Average +/–	VOUT = 4 V Step, 10–90%	900	1200		1100	1500		V/µs
Rise/Fall Time	VOUT = 0.5 V Step, 10–90%		1.4			1.2		ns
Settling Time	VOUT = 4 V Step, 10–90%		2.6			2.2		ns
	VOUT = 2 V Step		10			10		ns
To 0.1%
To 0.01%	VOUT = 2 V Step		16			16		ns
HARMONIC/NOISE PERFORMANCE	2 V p-p; 20 MHz, RL = 100 Ω
2nd Harmonic Distortion			–59	–52		–52	–45	dBc
	RL = 500 Ω		–66	–59		–72	–65	dBc
3rd Harmonic Distortion	2 V p-p; 20 MHz, RL = 100 Ω		–68	–61		–70	–63	dBc
	RL = 500 Ω		–72	–65		–80	–73	dBc
3rd Order Intercept	25 MHz		46			41		dBm
Noise Figure	RS = 50 Ω		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								µV rms
Input Noise Voltage	0.1 MHz to 200 MHz		95			60
Differential Gain Error (3.58 MHz)	RL = 150 Ω		0.05	0.09		0.02	0.04	%
Differential Phase Error (3.58 MHz)	RL = 150 Ω		0.02	0.04		0.02	0.04	Degree
Phase Nonlinearity	DC to 100 MHz		1.1			1.1		Degree
CLAMP PERFORMANCE		± 3.3	± 3.9		± 3.3	± 3.9
Clamp Voltage Range2	VCH or VCL							V
Clamp Accuracy	2× Overdrive, VCH = +2 V, VCL = –2 V		± 3	± 10		± 3	± 10	mV
Clamp Nonlinearity Range3	TMIN–TMAX			± 20			± 20	mV
			100			100		mV
Clamp Input Bias Current (VH or VL)	8036, VH, L = ± 1 V; 8037, VH, L = ± 0.5 V		± 40	± 60		± 50	± 70	µA
	TMIN–TMAX			± 80			± 90	µA
Clamp Input Bandwidth (–3 dB)	VCH or VCL = 2 V p-p	150	240		180	270		MHz
Clamp Overshoot	2× Overdrive, VCH or VCL = 2 V p-p		1	5		1	5	%
Overdrive Recovery	2× Overdrive		1.5			1.3		ns
DC PERFORMANCE4, RL = 150 Ω
Input Offset Voltage5			2	7		2	7	mV
	TMIN–TMAX		± 10	11		± 10	10	mV
Offset Voltage Drift								µV/°C
Input Bias Current			4	10		3	9	µA
	TMIN–TMAX			15			15	µA
Input Offset Current			0.3	3		0.1	3	µA
	TMIN–TMAX			5			5	µA
Common-Mode Rejection Ratio	VCM = ± 2 V	66	90		70	90		dB
Open-Loop Gain	VOUT = ± 2.5 V	48	55		54	60		dB
	TMIN–TMAX	40			46			dB
INPUT CHARACTERISTICS								kΩ
Input Resistance			500			500
Input Capacitance			1.2			1.2		pF
Input Common-Mode Voltage Range			± 2.5			± 2.5		V
OUTPUT CHARACTERISTICS
Output Voltage Range, RL = 150 Ω		± 3.2	± 3.9		± 3.2	± 3.9		V
Output Current			70			70		mA
Output Resistance			0.3			0.3		Ω
Short Circuit Current			240			240		mA
POWER SUPPLY		± 3.0	± 5.0	± 6.0	± 3.0	± 5.0	± 6.0
Operating Range								V
Quiescent Current			20.5	21.5		18.5	19.5	mA
	TMIN–TMAX			25			24	mA
Power Supply Rejection Ratio	TMIN–TMAX	50	60		56	66		dB
NOTES
1See Max Ratings and Theory of Operation sections of data sheet.
2See Max Ratings.
3Nonlinearity is defined as the voltage delta between the set input clamp voltage (VH or VL) and the voltage at which VOUT starts deviating from VIN (see Figure 73).
4Measured at AV = 50.
5Measured with respect to the inverting input.
Specifications subject to change without notice.

–2–

REV. B

AD8036/AD8037

ABSOLUTE MAXIMUM RATINGS1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 12.6 V
Voltage Swing × Bandwidth Product . . . . . . .	. . . . 350 V-MHz
|VH–VIN| . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . ≤ 6.3 V
|VL–VIN| . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . ≤ 6.3 V
Internal Power Dissipation2
Plastic DIP Package (N) . . . . . . . . . . . . . .	. . . . . . 1.3 Watts
Small Outline Package (SO) . . . . . . . . . . . .	. . . . . . 0.9 Watts
Input Voltage (Common Mode) . . . . . . . . . .	. . . . . . . . . . ± VS
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

1Stresses 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.

2Specification 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 –VS.

–IN VH +VS

2		8

0.046

(1.17)

		4	5
3

7

6 OUT

8 0 3 6

+IN	–VS	VL	AD8036
		0.050 (1.27)
–IN		VH	+VS

2		8

0.046

(1.17)

3		4	5

7

6 OUT

8 0 3 7

+IN	–VS		AD8037
		VL
		0.050 (1.27)

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 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 protected, this may not be sufficient to guarantee that the maximum 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
			8-LEAD PLASTIC DIP					TJ = +150 C
– Watts					PACKAGE
	1.5
DISSIPATION
	1.0
POWER				8-LEAD SOIC
MAXIMUM
	0.5			PACKAGE
	0	–10	0	10	20 30	40	50	60 70 80	90
	–50 –40 –30 –20
		AMBIENT TEMPERATURE – C

Figure 2. Plot of Maximum Power Dissipation vs. Temperature

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	–55°C to +125°C	Evaluation Board
5962-9559701MPA		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

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

	RF						RF
	10 F						10 F
	+VS					+VH	+VS
PULSE	0.1 F				PULSE	0.1 F	0.1 F
GENERATOR					GENERATOR
TR/TF = 350ps					TR/TF = 350ps
	AD8036			VOUT		130	AD8036			VOUT
VIN	130				VIN
	0.1 F	R	L	= 100			0.1 F	R	L	= 100
49.9	10 F				49.9		10 F
						0.1 F
	–VS					VL	–VS

TPC 1. Noninverting Configuration, G = +1			TPC 4. Noninverting Clamp Configuration, G = +1

TPC 2. Large Signal Transient Response; VO = 4 V p-p, G = +1, RF = 140 Ω

TPC 3. Small Signal Transient Response; VO = 400 mV p-p, G = +1, RF = 140 Ω

TPC 5. Clamped Large Signal Transient Response (2× Overdrive); VO = 2 V p-p, G = +1, RF = 140 Ω, VH = +1 V, VL = –1 V

TPC 6. Clamped Small Signal Transient Response (2× Overdrive); VO = 400 mV p-p, G = +1, RF = 140 Ω, VH = +0.2 V, VL = –0.2 V

–4–

REV. B

AD8036/AD8037

AD8037–Typical Characteristics

	RF
PULSE	10 F
GENERATOR
	+VS
TR/TF = 350ps	0.1 F
RIN
100	AD8037	VOUT
VIN	0.1 F	RL = 100
49.9	10 F
	–VS
TPC 7. Noninverting Configuration, G = +2

TPC 8. Large Signal Transient Response; VO = 4 V p-p,

G = +2, RF = RIN = 274 Ω

TPC 9. Small Signal Transient Response;

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

		RF
PULSE		10 F
GENERATOR	+VH
		+VS
TR/TF = 350ps	0.1 F	0.1 F
RIN
	100	AD8037	VOUT
VIN
		0.1 F	RL = 100
49.9		10 F
	0.1 F
	VL	–VS

TPC 10. Noninverting Clamp Configuration, G = +2

TPC 11. Clamped Large Signal Transient Response (2× Overdrive); VO = 2 V p-p, G = +2, RF = RIN = 274 Ω, VH = +0.5 V, VL = –0.5 V

TPC 12. Clamped Small Signal Transient Response

(2× Overdrive); VO = 400 mV p-p, G = +2, RF = RIN = 274 Ω, VH = +0.1 V, VL = –0.1 V

REV. B

–5–

AD8036/AD8037

AD8036–Typical Characteristics

	2
	1			200
	0			140
	–1	VO = 300mV p-p
	–2	VS = 5V	102
dB		RL = 100	49.9
–	–3
GAIN
	–4
	–5
	–6
	–7
	–8
	1M	10M	100M	1G
		FREQUENCY – Hz

TPC 13. AD8036 Small Signal Frequency Response,

G = +1

	0.2
	0.1			158
	0			150
	–0.1	VO = 300mV p-p	140
dB
	–0.2	VS = 5V	130
–		RL = 100
	–0.3
GAIN
	–0.4
	–0.5
	–0.6
	–0.7
	–0.8	10M	100M	1G
	1M
		FREQUENCY – Hz

TPC 14. AD8036 0.1 dB Flatness, N Package (for R Package Add 20 Ω to RF)

	90																																												100
	80																																												80
	70																																												60
																														PHASE																Degrees–MARGIN
dB–GAINLOOP-	60																																												40
	50																																												20
	40																																												0
												GAIN
OPEN	30																																												–20	PHASE
	10																																												–60
	20																																												–40
	0																																												–80
	–10																																												–100
	–20																																												–120
	10k						100k										1M								10M								100M										1G
															FREQUENCY – Hz

TPC 15. AD8036 Open-Loop Gain and Phase Margin vs. Frequency, RL = 100 Ω

	400
										RF
	350			VS = 5V
– MHz				RL = 100			130		AD8036
				GAIN = +1								RL
							49.9
BANDWIDTH			N PACKAGE
	300
			R PACKAGE
–3dB	250
	200
	20	40	60	80	100	120	140	160		180	200	220	240

VALUE OF FEEDBACK RESISTOR (RF) –

TPC 16. AD8036 Small Signal –3 dB Bandwidth vs. RF

	2
	1			250
	0
	–1	VS = 5V
dB			50
	–2	VO = 2.5V p-p
–		RL = 100
OUTPUT	–3
			RF = 50
	–4
			TO
			250
	–5		BY
			50
	–6
	–7
	–8	10M	100M	1G
	1M

FREQUENCY – Hz

TPC 17. AD8036 Large Signal Frequency Response,

G = +1
	2
	1
	0
	–1	VS = 5V
		VO = 300mV p-p
– dB	–2	RL = 100
	–3		140
GAIN
	–4
	–5		AD8036	(VO)
	–6	1V	100
			VH
	–7		VL (VIN)
	–8
	100k	1M	10M	100M	1G

FREQUENCY – Hz

TPC 18. AD8036 Clamp Input Bandwidth, VH, VL

–6–

REV. B

AD8036/AD8037

–30

0.06

%

0.04

–

0.02

dBc–

VO = 2V p-p

GAINDIFF

0.00

–50

VS = 5V

RL = 500

–0.02

DISTORTIONHARMONIC

G = +1

–0.04

Degrees–PHASE

–70

–0.06

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

–90

2ND HARMONIC

0.04

0.02

–110

3RD HARMONIC

0.00

–0.02

–130

DIFF

–0.04

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

10k

100k

1M

10M

100M

FREQUENCY – Hz

TPC 19. AD8036 Harmonic Distortion vs. Frequency,

TPC 22. AD8036 Differential Gain and Phase Error,

RL = 500 Ω

G = +1, RL = 150 Ω, F = 3.58 MHz

–30

VO = 2V p-p

0.05

VS = 5V

0.04

dBc

–50

RL = 100

0.03

G = +1

–

–110

ERROR– %

–0.03

DISTORTIONHARMONIC

2ND HARMONIC

0.02

–70

0.01

0

–90

–0.01

3RD HARMONIC

–0.02

–0.04

–130

–0.05

10k

100k

1M

10M

100M

0

5

10

15

20

25

30

35

40

45

FREQUENCY – Hz

SETTLING TIME – ns

TPC 20. AD8036 Harmonic Distortion vs. Frequency,

TPC 23. AD8036 Short-Term Settling Time to 0.01%, 2 V

RL = 100 Ω

Step, G = +1, RL = 100 Ω

60

0.4

0.3

50

0.2

INTERCEPT– +dBm

0.1

ERROR– %

0

–0.1

40

–0.2

–0.3

30

–0.4

–0.5

20

–0.6

100

10

20

40

60

80

0

2

4

6

8

10

12

14

16

18

FREQUENCY – MHz

SETTLING TIME - s

TPC 21. AD8036 Third Order Intercept vs. Frequency

TPC 24. AD8036 Long-Term Settling Time, 2 V Step,

G = +1, RL = 100 Ω

REV. B

–7–