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AD8021ARM Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD8021ARM Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 20 page REV. D 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. AD8021 Low Noise, High Speed Amplifier for 16-Bit Systems FEATURES Low Noise 2.1 nV/ √Hz Input Voltage Noise 2.1 pA/ √Hz Input Current Noise Custom Compensation Constant Bandwidth from G = –1 to G = –10 High Speed 200 MHz (G = –1) 190 MHz (G = –10) Low Power 34 mW or 6.7 mA Typ for 5 V Supply Output Disable Feature, 1.3 mA Low Distortion –93 dB Second Harmonic, fC = 1 MHz –108 dB Third Harmonic, fC = 1 MHz DC Precision 1 mV Max Input Offset Voltage 0.5 V/ C Input Offset Voltage Drift Wide Supply Range, 5 V to 24 V Low Price Small Packaging Available in SOIC-8 and MSOP-8 APPLICATIONS ADC Preamp and Driver Instrumentation Preamp Active Filters Portable Instrumentation Line Receivers Precision Instruments Ultrasound Signal Processing High Gain Circuits PRODUCT DESCRIPTION The AD8021 is a very high performance, high speed voltage feedback amplifier that can be used in 16-bit resolution systems. It is designed to have low voltage and current noise (2.1 nV/ √Hz typ and 2.1 pA/ √Hz typ) while operating at the lowest quiescent supply current (7 mA @ ±5 V) among today’s high speed, low noise op amps. The AD8021 operates over a wide range of supply voltages from ± 2.5 V to ± 12 V, as well as from single 5 V supplies, making it ideal for high speed, low power instru- ments. An output disable pin allows further reduction of the quiescent supply current to 1.3 mA. The AD8021 allows the user to choose the gain bandwidth product that best suits the application. With a single capacitor, the user can compensate the AD8021 for the desired gain with little trade-off in bandwidth. The AD8021 is a very well behaved amplifier that settles to 0.01% in 23 ns for a 1 V step. It has a fast overload recovery of 50 ns. The AD8021 is stable over temperature with low input offset voltage drift and input bias current drift, 0.5 µV/°C and 10 nA/°C, respectively. The AD8021 is also capable of driving a 75 Ω line with ±3 V video signals. The AD8021 is not only technically superior, but also priced considerably less than comparable amps drawing much higher quiescent current. The AD8021 is a high speed, general-purpose amplifier, ideal for a wide variety of gain configurations, and can be used throughout a signal processing chain and in control loops. The AD8021 is available in both standard 8-lead SOIC and MSOP packages in the industrial temperature range of –40 °C to +85°C. FREQUENCY – Hz 0.1M 1G 1M 10M 100M 24 21 –6 18 15 12 9 6 3 0 –3 VOUT = 50mV p-p G = –5, RF = 1k , RG = 200 , RIN = 66.5 , CC = 1.5pF G = –2, RF = 499 , RG = 249 , RIN = 63.4 , CC = 4pF G = –1, RF = 499 , RG = 499 , RIN = 56.2 , CC = 7pF G = –10, RF = 1k , RG = 100 , RIN = 100 , CC = 0pF Figure 1. Small Signal Frequency Response CONNECTION DIAGRAM SOIC-8 (R-8) MSOP-8 (RM-8) 8 7 6 5 1 2 3 4 LOGIC REFERENCE –IN +IN –VS DISABLE +VS VOUT CCOMP AD8021 |
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