Datasheet AD8036, AD8037 (Analog Devices)

a
Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps AD8036/AD8037 FEATURES FUNCTIONAL BLOCK DIAGRAM Superb Clamping Characteristics 8-Lead Plastic DIP (N), Cerdip (Q), 3 mV Clamp Error and SO Packages 1.5 ns Overdrive Recovery Minimized Nonlinear Clamping Region 240 MHz Clamp Input Bandwidth NC 1 AD8036/ 8 VH 3.9 V Clamp Input Range AD8037 –INPUT 2 7 +VS Wide Bandwidth AD8036 AD8037 Small Signal 240 MHz 270 MHz +INPUT 3 6 OUTPUT Large Signal (4 V p-p) 195 MHz 190 MHz –VS 4 5 VL Good DC Characteristics (Top View) 2 mV Offset NC = NO CONNECT 10 V/ C Drift Ultralow Distortion, Low Noise
large-signal bandwidths and ultralow distortion. The AD8036
–72 dBc typ @ 20 MHz
achieves –66 dBc at 20 MHz, and 240 MHz small-signal and
4.5 nV/
√
Hz Input Voltage Noise
195 MHz large-signal bandwidths. The AD8036 and AD8037’s
High Speed
recover from 2× clamp overdrive within 1.5 ns. These character-
Slew Rate 1500 V/ s
istics position the AD8036/AD8037 ideally for driving as well as
Settling 10 ns to 0.1%, 16 ns to 0.01%
buffering flash and high resolution ADCs.
3 V to 5 V Supply Operation
In addition to traditional output clamp amplifier applications,
APPLICATIONS
the input clamp architecture supports the clamp levels as addi-
ADC Buffer
tional inputs to the amplifier. As such, in addition to static dc
IF/RF Signal Processing
clamp levels, signals with speeds up to 240 MHz can be applied
High Quality Imaging
to the clamp pins. The clamp values can also be set to any value
Broadcast Video Systems
within the output voltage range provided that VH is greater that
Video Amplifier
VL. Due to these clamp characteristics, the AD8036 and AD8037
Full Wave Rectifier
can be used in nontraditional applications such as a full-wave rectifier, a pulse generator, or an amplitude modulator. These
PRODUCT DESCRIPTION
novel applications are only examples of some of the diverse The AD8036 and AD8037 are wide bandwidth, low distortion applications which can be designed with input clamps. clamping amplifiers. The AD8036 is unity gain stable. The The AD8036 is offered in chips, industrial (–40°C to +85°C) AD8037 is stable at a gain of two or greater. These devices and military (–55°C to +125°C) package temperature ranges allow the designer to specify a high (VCH) and low (VCL) output and the AD8037 in industrial. Industrial versions are available clamp voltage. The output signal will clamp at these specified in plastic DIP and SOIC; MIL versions are packaged in cerdip. levels. Utilizing a unique patent pending CLAMPIN™ input
4
clamp architecture, the AD8036 and AD8037 offer a 10×
AD8036 VH = 3V
improvement in clamp performance compared to traditional
3
output clamping devices. In particular, clamp error is typically
VH = 2V 2
3 mV or less and distortion in the clamp region is minimized.
V
This product can be used as a classical op amp or a clamp
H = 1V 1
amplifier where a high and low output voltage are specified.
0
The AD8036 and AD8037, which utilize a voltage feedback
VL = –1V
architecture, meet the requirements of many applications which
–1
previously depended on current feedback amplifiers. The AD8036
VL = –2V OUTPUT VOLTAGE – Volts
and AD8037 exhibit an exceptionally fast and accurate pulse
–2
response (16 ns to 0.01%), extremely wide small-signal and
VL = –3V –3
CLAMPIN is a trademark of Analog Devices, Inc.
–4 –4 –3 –2 –1 0 1 2 3 4 INPUT VOLTAGE – Volts
REV. B Figure 1. Clamp DC Accuracy vs. Input Voltage 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
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otherwise under any patent or patent rights of Analog Devices.
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