AD8036 Analog Devices, AD8036 Datasheet

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AD8036

Manufacturer Part Number
AD8036
Description
Unity Gain Stable - Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps
Manufacturer
Analog Devices
Datasheet

Specifications of AD8036

-3db Bandwidth
240MHz
Slew Rate
1.2kV/µs
Vos
2mV
Ib
4µA
# Opamps Per Pkg
1
Input Noise (nv/rthz)
6.7nV/rtHz
Vcc-vee
6V to 12V
Isy Per Amplifier
21.5mA
Packages
DIP,SOIC

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a
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
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.
√Hz
CH
) and low (V
CL
) output
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
V
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.
Low Distortion, Wide Bandwidth
Voltage Feedback Clamp Amps
L
. Due to these clamp characteristics, the AD8036 and AD8037
–1
–2
–3
–4
4
3
2
1
0
–4
V
V
V
L
L
L
–INPUT
+INPUT
8-Lead Plastic DIP (N), Cerdip (Q),
FUNCTIONAL BLOCK DIAGRAM
= –3V
= –2V
AD8036
= –1V
–3
–V
NC
S
1
2
3
4
–2
and SO Packages
NC = NO CONNECT
INPUT VOLTAGE – Volts
(Top View)
–1
AD8036/AD8037
AD8036/
AD8037
0
1
8
7
6
5
+V
V
OUTPUT
V
H
L
S
2
H
is greater that
V
V
V
3
H
H
H
= 3V
= 2V
= 1V
4

Related parts for AD8036

AD8036 Summary of contents

Page 1

... The clamp values can also be set to any value within the output voltage range provided that Due to these clamp characteristics, the AD8036 and AD8037 L can be used in nontraditional applications such as a full-wave rectifier, a pulse generator amplitude modulator. These novel applications are only examples of some of the diverse applications which can be designed with input clamps ...

Page 2

... Nonlinearity is defined as the voltage delta between the set input clamp voltage (V 4 Measured 50 Measured with respect to the inverting input. ations subject to change without notice. Specific ( 100 ; (AD8036 LOAD V otherwise noted) ≤ 0.4 V p-p OUT = 2.5 V p-p; 8037 3.5 V p-p 160 OUT OUT ≤ 0.4 V p-p OUT = 140 Ω; 8037 274 Ω ...

Page 3

... 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 ...

Page 4

... AD8036/AD8037 AD8036–Typical Characteristics PULSE 0.1 F GENERATOR 350ps R F AD8036 130 –V S Ω Ω PULSE 0.1 F GENERATOR 350ps OUT 130 100 IN L 49.9 0.1 F × 0.1 F AD8036 V OUT 0 100 – × ...

Page 5

... GENERATOR + 350ps AD8037 100 –V S Ω PULSE GENERATOR 350ps 0 100 OUT 100 L 49.9 0.1 F × Ω × Ω Ω AD8036/AD8037 0.1 F AD8037 V OUT 0 100 – ...

Page 6

... AD8036/AD8037 AD8036–Typical Characteristics 300mV p-p – 102 S – 100 L 49.9 –3 –4 –5 –6 –7 –8 1M 10M 100M FREQUENCY – Hz 0.2 0.1 0 –0.1 140 V = 300mV p-p O –0 130 R = 100 L –0.3 –0.4 –0.5 –0.6 –0.7 –0.8 1M 10M 100M FREQUENCY – Hz Ω ...

Page 7

... AD8036/AD8037 3rd 4th 5th 6th 7th 8th 9th 10th 11th 3rd 4th 5th 6th 7th 8th 9th 10th 11th Ω SETTLING TIME – ns Ω ...

Page 8

... AD8036/AD8037 AD8037–Typical Characteristics 300mV p-p 274 174 R = 100 –1 –2 1M 10M 100M FREQUENCY – Hz 0.2 0 3.00mV p-p –0.1 O 249 –0 100 L 224 –0.3 –0.4 –0.5 –0.6 –0.7 –0.8 10M 1M 100M FREQUENCY – Hz Ω ...

Page 9

... AD8036/AD8037 4th 5th 6th 7th 8th 9th 10th 11th 4th 5th 6th 7th 8th 9th 10th 11th Ω SETTLING TIME – ns Ω ...

Page 10

... AD8036/AD8037–Typical Characteristics 100 1k FREQUENCY – –PSRR 70 65 +PSRR 10k 100k 1M 10M FREQUENCY – Hz 100 100 100k 1M 10M FREQUENCY – ...

Page 11

... L 88 100 120 140 15 AD8036/AD8037 +A OL – –A OL – 100 120 JUNCTION TEMPERATURE – C –PSRR AD8037 +PSRR AD8037 AD8036 AD8036 – 100 120 JUNCTION TEMPERATURE – JUNCTION TEMPERATURE – C 140 140 95 ...

Page 12

... AD8036/AD8037–Typical Characteristics AD8037 AD8037 –60 –40 – JUNCTION TEMPERATURE – C –2. –2.25 –2.00 AD8037 –1. –1.50 –1.25 AD8036 –1.00 –0.75 –0.50 –60 –40 – JUNCTION TEMPERATURE – WAFER LOTS ...

Page 13

... ABSOLUTE VALUE OF OUTPUT VOLTAGE – Volts –20 –40 –60 –80 0.8 1.0 –5 –4 –3 INPUT CLAMP VOLTAGE (V +2V +1V 0V AD8037 3RD HARMONIC AD8036 3RD HARMONIC AD8036 AD8037 V +1V +0. –1V –0. +1V +2V 0.7 0.75 0.8 0.85 0.9 0.95 1.0 POSITIVE DENOTES BH BL CURRENT FLOW INTO ...

Page 14

... AD8036/AD8037–Clamp Characteristics 0.5 0.4 0.3 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0 SETTLING TIME – ns × 0.5 0.4 0.3 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0 SETTLING TIME – ns × 0.5 0.4 0.3 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0 SETTLING TIME – ns × × ...

Page 15

... See Input Clamp Amp Operation and Applications sections otherwise. Feedback Resistor Choice The value of the feedback resistor is critical for optimum perfor- mance on the AD8036 (gain +1) and less critical as the gain increases. Therefore, this section is specifically targeted at the AD8036. At minimum stable gain (+1), the AD8036 provides optimum = 140 Ω ...

Page 16

... Note that the main signal path always operates closed loop, since the CLAMPIN circuit only affects A1’s noninverting input voltage ramp is applied to the AD8036’s +V for the connection just described, V OUT perfectly then should limit at exactly continues ...

Page 17

... L Unity Gain Clamping The simplest circuit for calculating the clamp levels is a unity gain follower as shown in Figure 8. In this case, the AD8036 should be used since it is compensated for noninverting unity gain. This circuit will clamp at an upper voltage set by V applied to Pin 8) and a lower voltage set by V applied to Pin 5) ...

Page 18

... AD9002 during power-up transients. Programmable Pulse Generator The AD8036/AD8037’s clamp output can be set accurately and has a well controlled flat level. This along with wide bandwidth and high slew rate make them very well suited for programmable level pulse generators ...

Page 19

... Fig- ure 13. For a input/output scope photo with an input signal of 20 MHz and amplitude ± see Figure 14. LOWER CLAMPING LEVEL WITH NO NEG INPUT OUT IN – AD8036/AD8037 +15V 0 PULSE OUT 0 – ...

Page 20

... AD8036/AD8037 Thus for either positive or negative input signals, the output is unity times the absolute value of the input signal. The circuit can be easily configured to produce the negative absolute value of the input by applying the input The circuit can get to within about ground during the time when the input crosses zero ...

Page 21

... Evaluation Board An evaluation board for both the AD8036 and AD8037 is available that has been carefully laid out and tested to demon- strate that the specified high speed performance of the device can be realized ...

Page 22

... AD8036/AD8037 ...

Page 23

... MAX 8 5 0.310 (7.87) 0.220 (5.59) PIN 0.100 (2.54) BSC 0.320 (8.13) 0.405 (10.29) MAX 0.290 (7.37) 0.060 (1.52) 0.015 (0.38) 0.200.(5.08) MAX 0.150 0.200 (5.08) (3.81) 0.125 (3.18) MIN 15° SEATING 0° 0.023 (0.58) 0.070 (1.78) PLANE 0.014 (0.36) 0.030 (0.76) AD8036/AD8037 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.0196 (0.50) 45 0.0099 (0.25) 8 0.0500 (1.27) 0 0.0160 (0.41) 0.015 (0.38) 0.008 (0.20) ...

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