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AD8028 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD8028 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 25 page Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers AD8027/AD8028 Rev. C 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. Specifications subject to change without notice. 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: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES High speed 190 MHz, –3 dB bandwidth (G = +1) 100 V/μs slew rate Low distortion 120 dBc @ 1 MHz SFDR 80 dBc @ 5 MHz SFDR Selectable input crossover threshold Low noise 4.3 nV/√Hz 1.6 pA/√Hz Low offset voltage: 900 μV max Low power: 6.5 mA/amplifier supply current Power-down mode No phase reversal: VIN > |VS| + 200 mV Wide supply range: 2.7 V to 12 V Small packaging: SOIC-8, SOT-23-6, MSOP-10 APPLICATIONS Filters ADC drivers Level shifting Buffering Professional video Low voltage instrumentation GENERAL DESCRIPTION The AD8027/AD80281 are high speed amplifiers with rail-to- rail input and output that operate on low supply voltages and are optimized for high performance and wide dynamic signal range. The AD8027/AD8028 have low noise (4.3 nV/√Hz, 1.6 pA/√Hz) and low distortion (120 dBc at 1 MHz). In appli- cations that use a fraction of, or the entire input dynamic range and require low distortion, the AD8027/AD8028 are ideal choices. Many rail-to-rail input amplifiers have an input stage that switches from one differential pair to another as the input signal crosses a threshold voltage, which causes distortion. The AD8027/AD8028 have a unique feature that allows the user to select the input crossover threshold voltage through the SELECT pin. This feature controls the voltage at which the complementary transistor input pairs switch. The AD8027/ AD8028 also have intrinsically low crossover distortion. CONNECTION DIAGRAMS AD8027 SOT-23-6 (RT) VOUT 1 –VS 2 +IN 3 5 6 +VS DISABLE/SELECT 4 –IN +– 03327-B-001 NC = NO CONNECT NC AD8027 SOIC-8 (R) 1 –IN 2 +IN 3 –VS 4 +VS VOUT NC 8 7 6 5 DISABLE/SELECT VOUTB –IN B +IN B 8 7 6 5 +VS VOUTA AD8028 SOIC-8 (R) 1 –IN A 2 +IN A 3 –VS 4 + – – + VOUTB 10 9 +VS DISABLE/SELECT B –IN B +IN B 8 7 6 DISABLE/SELECT A VOUTA AD8028 MSOP-10 (RM) 1 –IN A 2 +IN A 3 –VS 4 5 + – + – Figure 1. Connection Diagrams (Top View) With their wide supply voltage range (2.7 V to 12 V) and wide bandwidth (190 MHz), the AD8027/AD8028 amplifiers are designed to work in a variety of applications where speed and performance are needed on low supply voltages. The high per- formance of the AD8027/AD8028 is achieved with a quiescent current of only 6.5 mA/amplifier typical. The AD8027/AD8028 have a shutdown mode that is controlled via the SELECT pin. The AD8027/AD8028 are available in SOIC-8, MSOP-10, and SOT-23-6 packages. They are rated to work over the industrial temperature range of –40°C to +125°C. OUTPUT VOLTAGE (V p-p) 0123456789 1 –140 –120 –100 –80 –60 –40 –20 0 G = +1 FREQUENCY = 100kHz RL = 1kΩ VS = ±5V VS = +3V VS = +5V 03327-A-063 Figure 2. SFDR vs. Output Amplitude 1Protected by U.S. patent numbers 6,486,737B1; 6,518,842B1 |
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