ایزولاتور ایزولاتور دیجیتال

Product Attributes

Introduction

The AD260 is designed using Analog Devices new IsoLogic circuit architecture 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 AD260 effectively replaces up to five opto-isolators while also providing the 1.5 w transformer for a 3.5 kV isolated dc-dc power supply circuit. Each line of the AD260 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 AD260 can be used to accurately isolate time-based PWM signals. All field or system output pins of the AD260 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. System side outputs being three-stated allows for easy multiplexing of multiple AD260s. The isolation barrier of the AD260 B Grade is 100% tested at 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 terminals relative to the system side, with no false output triggering on either side. Each output is updated within nanoseconds by input logic transitions, the AD260 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. The AD260 also has an integral center tap transformer for generating isolated power. Typically driven by a 5 V push-pull drive at the primary, it will generate a 37 V p-p output capable of supplying up to 1.5 W. This can then be regulated to the desired voltage, including ±5 V dc for circuit components and 24 V for a 20 mA loop supply when needed.

Features

• IsoLogic™ Circuit Architecture
• Isolation Test Voltage: To 3.5 kV rms
• Five Isolated Logic Lines: Available in Six I/O Configurations
• Logic Signal Bandwidth: 20 MHz (Min), 40 mbps (NRZ)
• Isolated Power Transformer: 37 V p-p, 1.5 W Max
• CMV Transient Immunity: 10 kV/μs Min
• Waveform Edge Transmission Symmetry: ±↑ ns
• Field and System Output Enable/Three-State Functions
• Performance Rated Over -25°C to ±85°C
• UL1950, IEC950, EN60950 Certification, 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