TRISTATE TRISTATE TRISTATE TRISTATE High Speed, Logic Isolator a with Power Transformer AD260 FEATURES FUNCTIONAL BLOCK DIAGRAM IsoLogic Circuit Architecture Isolation Test Voltage: To 3.5 kV rms AD260 LATCH D 1 S0 F0 18 LINE 0 Five Isolated Logic Lines: Available in Six I/O Configurations E Logic Signal Bandwidth: 20 MHz (Min), 40 mbps (NRZ) LATCH Isolated Power Transformer: 37 V p-p, 1.5 W Max D 2 S1 F1 19 LINE 1 CMV Transient Immunity: 10 kV/ms Min E Waveform Edge Transmission Symmetry: 61 ns LATCH D 3 S2 20 F2 LINE 2 Field and System Output Enable/Three-State Functions E Performance Rated Over 258C to +858C LATCH UL1950, IEC950, EN60950 Certification, Pending F3 21 D 4 S3 LINE 3 E APPLICATIONS LATCH F4 22 D 5 S4 PLC/DCS Analog Input and Output Cards LINE 4 E Communications Bus Isolation General Data Acquisition Applications ENABLE 6 17 ENABLE FLD SYS IGBT Motor Drive Controls +5Vdc +5Vdc High Speed Digital I/O Ports +5Vdc 16 7 +5Vdc FLD SYS 5Vdc RTN 5Vdc RTN 5V RTN 15 8 5V RTN FLD SYS GENERAL DESCRIPTION 17V p-p OUT DRIVE The AD260 is designed using Analog Devices new IsoLogic PWRA 14 9 DRVA FLD circuit architecture to isolate five digital control signals to/ +5V CT OUT PWRCT 13 10 DRVCT FLD from a microcontroller and its related field I/O components. Six 17V p-p OUT DRIVE models allow all I/O combinations from five input lines to five 11 PWRB 12 DRVB FLD FIELD SYSTEM output lines, including combinations in between. Every AD260 effectively replaces up to five opto-isolators while also providing the input. This guarantees the output is always valid 10 m s after the 1.5 W transformer for a 3.5 kV isolated dc-dc power supply a fault condition or after the power-up reset interval. circuit. The AD260 also has an integral center tap transformer for gen- Each line of the AD260 has a bandwidth of 20 MHz (min) with erating isolated power. Typically driven by a 5 V push-pull drive a propagation delay of only 14 ns, which allows for extremely at the primary, it will generate a 37 V p-p output capable of fast data transmission. Output waveform symmetry is maintained supplying up to 1.5 W. This can then be regulated to the de- to within 1 ns of the input so the AD260 can be used to accu- sired voltage, including 5 V dc for circuit components and rately isolate time-based PWM signals. 24 V for a 20 mA loop supply when needed. 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 PRODUCT HIGHLIGHTS output three-stated offers a convenient method of presetting Six Isolated Logic Line I/O Configurations Available: The logic levels at power-up by use of pull-up/down resistors. Sys- AD260 is available in six pin-compatible versions of I/O con- tem side outputs being three-stated allows for easy multiplexing figurations to meet a wide variety of requirements. of multiple AD260s. Wide Bandwidth with Minimal Edge Error: The AD260 with The isolation barrier of the AD260 B Grade is 100% tested at IsoLogic affords extremely fast isolation of logic signals due to its 3.5 kV rms (system to field). The barrier design also provides 20 MHz bandwidth and 14 ns propagation delay. It maintains a excellent common-mode transient immunity from 10 kV/m s waveform input-to-output edge transition error of typically less common-mode voltage excursions of field side terminals relative than 1 ns (total) for positive vs. negative transition. to the system side, with no false output triggering on either side. 3.5 kV rms Test Voltage Isolation Rating: The AD260 Each output is updated within nanoseconds by input logic tran- B Grade is rated to operate at 1.25 kV rms and is 100% pro- sitions, the AD260 also has a continuous output update feature duction tested at 3.5 kV rms, using a standard ADI test method. that automatically updates each output based on the dc level of High Transient Immunity: The AD260 rejects common- mode transients slewing at up to 10 kV/m s without false trigger- IsoLogic is a trademark of Analog Devices, Inc. ing or damage to the device. (Continued on page 6) REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: (Typical at T = +258C, +5 V dc , +5 V dc , t = 50 ns max unless otherwise noted) AD260SPECIFICATIONS A SYS FLD RR Parameter Conditions Min Typ Max Units INPUT CHARACTERISTICS Threshold Voltage Positive Transition (V ) +5 V dc = 4.5 V 2.0 2.7 3.15 V T+ SYS +5 V dc = 5.5 V 3.0 3.2 4.2 V SYS Negative Transition (V ) +5 V dc = 4.5 V 0.9 1.8 2.2 V T SYS +5 V dc = 5.5 V 1.2 2.2 3.0 V SYS Hysteresis Voltage (V ) +5 V dc = 4.5 V 0.4 0.9 1.4 V H SYS +5 V dc = 5.5 V 0.5 1.0 1.5 V SYS Input Capacitance (C ) 5pF IN Input Bias Current (I ) Per Input 0.5 m A IN OUTPUT CHARACTERISTICS 1 Output Voltage High Level (V ) +5 V dc = 4.5 V, I = 0.02 mA 4.4 V OH SYS O +5 V dc = 4.5 V, I = 4 mA 3.7 V SYS O Low Level (V ) +5 V dc = 4.5 V, I = 0.02 mA 0.1 V OL SYS O +5 V dc = 4.5 V, I = 4 mA 0.4 V SYS O Output Three-State Leakage Current ENABLE Logic Low/High Level Respectively 0.5 m A SYS/FLD 1 DYNAMIC RESPONSE (Refer to Figure 2) Max Logic Signal Frequency (f ) 50% Duty Cycle, +5 V dc = 5 V 20 MHz MIN SYS Waveform Edge Symmetry Error (t )t vs. t 1ns ERROR PHL PLH Logic Edge Propagation Delay (t , t)1425ns PHL PLH Minimum Pulsewidth (t ) 25 ns PWMIN Max Output Update Delay on Fault or After 2 Power-Up Reset Interval ( 30 m s) 12 m s 3 ISOLATION BARRIER RATING Operating Isolation Voltage (V ) AD260A 375 V rms CMV AD260B 1250 V rms 4 Isolation Rating Test Voltage (V ) AD260A 1750 V rms CMV TEST AD260B 3500 V rms Transient Immunity (V ) 10,000 V/m s TRANSIENT Isolation Mode Capacitance (C ) Total Capacitance, All Lines and Transformer 14 18 pF ISO Capacitive Leakage Current (I ) 240 V rms 60 Hz 2 m A rms LEAD POWER TRANSFORMER Primary Winding Bifilar Wound, Center-Tapped Inductance (L ) Each Half 1 mH P Number of Turns (N ) Each Half 26 Turns P Resistance Each Half 0.6 W Max Volt-Seconds (E t) Each Half 27 V m s Recommended Operating Frequency 25 C to +85 C, Push-Pull Drive 150 200 300 kHz Absolute Min Operating Frequency 25 C to +85 C, Push-Pull Drive 75 kHz Secondary Winding Bifilar Wound, Center-Tapped Number of Turns (N ) Each Half 48 Turns S Resistance Each Half 2.3 W Insulation Withstand (V ) Primary to Secondary 3,500 V rms CMV TEST Capacitance Primary to Secondary 5 pF Recommended Max Power Rated Performance 1.0 1.5 W POWER SUPPLY Supply Voltage (+5 V dc and +5 V dc ) Rated Performance 4.5 5.5 V dc SYS FLD Operating 4.0 5.75 V dc Power Dissipation Capacitance Effective, per Input, Either Side 8 pF Effective per Output, Either SideNo Load 28 pF Quiescent Supply Current Each, +5 V dc 4mA SYS & FLD Supply Current All Lines 10 MHz (Sum of +5 V dc)18 mA SYS & FLD TEMPERATURE RANGE 5 Rated Performance (T ) 25 +85 C A Storage (T ) 40 +85 C STG NOTES 1 For best performance, bypass +5 V dc supplies to com. at or near the device (0.01 m F). +5 V dc supplies are also internally bypassed with 0.05 m F. 2 As the supply voltage is applied to either side of the AD260, the internal circuitry will go into a power-up reset mode (all lines disabled) for about 30 m s after the point where +5 V dc passes above 3.3 V. SYS & FLD 3 Operating isolation voltage is derived from the Isolation Test Voltage in accordance with such methods as found in VDE-0883 wherein a device will be hi-pot tested at twice the operating voltage, plus one thousand volts. Partial discharge testing, with an acceptance threshold of 80 pC of discharge may be considered the same as a hi-pot test (but nondestructive). 4 Partial Discharge at 80 pC THLD. 5 Supply Current will increase slightly, but otherwise the unit will function within specification to 40 C. Specifications are subject to change without notice. REV. 0 2