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AD261AND-2 датащи(PDF) 1 Page - Analog Devices |
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AD261AND-2 датащи(HTML) 1 Page - Analog Devices |
1 / 6 page 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. a AD261 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1997 High Speed, Logic Isolator FUNCTIONAL BLOCK DIAGRAM TYPICAL MODEL (AD261-2) S0 F3 SYSTEM FIELD +5V dc 5Vdc RTN +5V dc 5Vdc RTN S1 2 S2 3 S3 S4 F0 F1 F2 F4 15 16 17 6 7 8 5 THREE- STATE LATCH E D LINE 0 +5V dcFLD 5V RTNFLD ENABLEFLD 5V RTNSYS +5V dcSYS ENABLESYS THREE- STATE LATCH E D LINE 1 THREE- STATE LATCH E D LINE 2 LATCH E D THREE- STATE LINE 4 LINE 3 LATCH E D THREE- STATE 4 FEATURES Isolation Test Voltage: To 3.5 kV rms Five Isolated Logic Lines: Available in Six I/O Configurations Logic Signal Bandwidth: 20 MHz (min) CMV Transient Immunity: 10 kV/ s min Waveform Edge Transmission Symmetry: 1 ns Field and System Output Enable/Three-State Functions Performance Rated Over –25 C to +85 C UL1950, IEC950, EN60950 Certification (VDE, CE, Pending) APPLICATIONS PLC/DCS Analog Input and Output Cards Communications Bus Isolation General Data Acquisition Applications IGBT Motor Drive Controls High Speed Digital I/O Ports GENERAL DESCRIPTION The AD261 is designed to isolate five digital control signals to/from a microcontroller and its related field I/O components. Six models allow all I/O combinations from five input lines to five output lines, including combinations in between. Every AD261 effectively replaces up to five opto-isolators. Each line of the AD261 has a bandwidth of 20 MHz (min) with a propagation delay of only 14 ns, which allows for extremely fast data transmission. Output waveform symmetry is maintained to within ±1 ns of the input so the AD261 can be used to accu- rately isolate time-based PWM signals. All field or system output pins of the AD261 can be set to a high resistance three-state level by use of the two enable pins. A field output three-stated offers a convenient method of presetting logic levels at power-up by use of pull-up/down resistors. Sys- tem side outputs being three-stated allows for easy multiplexing of multiple AD261s. The isolation barrier of the AD261 B Grade is 100% tested as high as 3.5 kV rms (system to field). The barrier design also provides excellent common-mode transient immunity from 10 kV/ µs common-mode voltage excursions of field side termi- nals relative to the system side, with no false output triggering on either side. Each output is updated within nanoseconds by input logic tran- sitions, the AD261 also has a continuous output update feature that automatically updates each output based on the dc level of the input. This guarantees the output is always valid 10 µs after a fault condition or after the power-up reset interval. PRODUCT HIGHLIGHTS Six Isolated Logic Line I/O Configurations Available: The AD261 is available in six pin-compatible versions of I/O con- figurations to meet a wide variety of requirements. Wide Bandwidth with Minimal Edge Error: The AD261 affords extremely fast isolation of logic signals due to its 20 MHz bandwidth and 14 ns propagation delay. It maintains a wave- form input-to-output edge transition error of typically less than ±1 ns (total) for positive vs. negative transition. 3.5 kV rms Test Voltage Isolation Rating: The AD261 B Grade is rated to operate at 1.25 kV rms and is 100% pro- duction tested at 3.5 kV rms, using a standard ADI test method. High Transient Immunity: The AD261 rejects common- mode transients slewing at up to 10 kV/ µs without false trigger- ing or damage to the device. (Continued on page 5) |
Аналогичный номер детали - AD261AND-2 |
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Аналогичное описание - AD261AND-2 |
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