Файл:AD8036, AD8037.pdf

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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) 195 MHz 190 MHz Good DC Characteristics 2 mV Offset 10 µV/°C Drift Ultralow Distortion, Low Noise –72 dBc typ @ 20 MHz 4.5 nV/√Hz Input Voltage Noise High Speed Slew Rate 1500 V/µs 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

FUNCTIONAL BLOCK DIAGRAM 8-Pin Plastic Mini-DIP (N), Cerdip (Q), and SO (R) Packages NC

1

8 VH

–INPUT

2

7 +VS

+INPUT

3

6 OUTPUT

–VS

4

5 VL

AD8036/37 TOP VIEW

NC = NO CONNECT

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 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 OUTPUT VOLTAGE – Volts

a

Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps AD8036/AD8037

VH = 2V

2

VH = 1V

1 0 VL = –1V –1 VL = –2V –2 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. 0 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 © Analog Devices, Inc., 1994 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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