a |
High Speed, Logic Isolator |
with Power Transformer |
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/ms Min Waveform Edge Transmission Symmetry: 61 ns
Field and System Output Enable/Three-State Functions Performance Rated Over –258C to +858C
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
GENERAL DESCRIPTION
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/ s 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
IsoLogic is a trademark of Analog Devices, Inc.
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.
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AD260 |
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FUNCTIONAL BLOCK DIAGRAM |
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AD260 |
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LATCH |
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F0 18 |
TRISTATE |
LINE 0 |
D |
1 |
S0 |
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E |
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LATCH |
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F1 |
19 |
TRISTATE |
LINE 1 |
D |
2 |
S1 |
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E |
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LATCH |
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S2 |
F2 |
20 |
TRISTATE |
LINE 2 |
D |
3 |
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E |
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LATCH |
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F3 |
21 |
D |
LINE 3 |
TRISTATE |
4 |
S3 |
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E |
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LATCH |
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F4 |
22 |
D |
LINE 4 |
TRISTATE |
5 |
S4 |
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E |
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ENABLEFLD |
17 |
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6 |
ENABLESYS |
+5VdcFLD |
16 |
+5Vdc |
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+5Vdc |
+5VdcSYS |
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5V RTNFLD |
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5Vdc RTN |
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5Vdc RTN |
5V RTNSYS |
15 |
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8 |
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PWRAFLD |
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17V p-p OUT |
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DRIVE |
DRVA |
14 |
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PWRCTFLD |
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CT OUT |
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+5V |
DRVCT |
13 |
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PWRBFLD |
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17V p-p OUT |
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DRIVE |
DRVB |
12 |
FIELD |
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SYSTEM |
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the input. This guarantees the output is always valid 10 s 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.
PRODUCT HIGHLIGHTS
Six Isolated Logic Line I/O Configurations Available: The AD260 is available in six pin-compatible versions of I/O configurations to meet a wide variety of requirements.
Wide Bandwidth with Minimal Edge Error: The AD260 with IsoLogic affords extremely fast isolation of logic signals due to its 20 MHz bandwidth and 14 ns propagation delay. It maintains a waveform 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 AD260 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 AD260 rejects commonmode transients slewing at up to 10 kV/ s without false triggering or damage to the device.
(Continued on page 6)
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., 1998 |
AD260–SPECIFICATIONS (Typical at TA = +258C, +5 V dcSYS, +5 V dcFLD, tRR = 50 ns max unless otherwise noted)
Parameter |
Conditions |
Min |
Typ |
Max |
Units |
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INPUT CHARACTERISTICS |
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Threshold Voltage |
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Positive Transition (VT+) |
+5 V dcSYS = 4.5 V |
2.0 |
2.7 |
3.15 |
V |
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+5 V dcSYS = 5.5 V |
3.0 |
3.2 |
4.2 |
V |
Negative Transition (VT–) |
+5 V dcSYS = 4.5 V |
0.9 |
1.8 |
2.2 |
V |
Hysteresis Voltage (VH) |
+5 V dcSYS = 5.5 V |
1.2 |
2.2 |
3.0 |
V |
+5 V dcSYS = 4.5 V |
0.4 |
0.9 |
1.4 |
V |
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Input Capacitance (CIN) |
+5 V dcSYS = 5.5 V |
0.5 |
1.0 |
1.5 |
V |
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5 |
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pF |
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Input Bias Current (IIN) |
Per Input |
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0.5 |
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µA |
OUTPUT CHARACTERISTICS |
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Output Voltage1 |
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High Level (VOH) |
+5 V dcSYS = 4.5 V, |IO| = 0.02 mA |
4.4 |
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V |
Low Level (VOL) |
+5 V dcSYS = 4.5 V, |IO| = 4 mA |
3.7 |
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V |
+5 V dcSYS = 4.5 V, |IO| = 0.02 mA |
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0.1 |
V |
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+5 V dcSYS = 4.5 V, |IO| = 4 mA |
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0.4 |
V |
Output Three-State Leakage Current |
ENABLESYS/FLD @ Logic Low/High Level Respectively |
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0.5 |
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µA |
DYNAMIC RESPONSE 1 (Refer to Figure 2) |
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Max Logic Signal Frequency (fMIN) |
50% Duty Cycle, +5 V dcSYS = 5 V |
20 |
±1 |
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MHz |
Waveform Edge Symmetry Error (tERROR) |
tPHL vs. tPLH |
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ns |
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Logic Edge Propagation Delay (tPHL, tPLH) |
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14 |
25 |
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Minimum Pulsewidth (tPWMIN) |
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25 |
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ns |
Max Output Update Delay on Fault or After |
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Power-Up Reset Interval (≈ 30 µs)2 |
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12 |
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µs |
ISOLATION BARRIER RATING3 |
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Operating Isolation Voltage (VCMV) |
AD260A |
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375 |
V rms |
Isolation Rating Test Voltage (VCMV TEST)4 |
AD260B |
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1250 |
V rms |
AD260A |
1750 |
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V rms |
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AD260B |
3500 |
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V rms |
Transient Immunity (VTRANSIENT) |
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10,000 |
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V/µs |
Isolation Mode Capacitance (CISO) |
Total Capacitance, All Lines and Transformer |
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14 |
18 |
pF |
Capacitive Leakage Current (ILEAD) |
240 V rms @ 60 Hz |
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2 |
µA rms |
POWER TRANSFORMER |
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Primary Winding |
Bifilar Wound, Center-Tapped |
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Inductance (LP) |
Each Half |
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1 |
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mH |
Number of Turns (NP) |
Each Half |
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26 |
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Turns |
Resistance |
Each Half |
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0.6 |
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Ω |
Max Volt-Seconds (E × t) |
Each Half |
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27 |
V × µs |
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 |
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kHz |
Secondary Winding |
Bifilar Wound, Center-Tapped |
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Number of Turns (NS) |
Each Half |
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48 |
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Turns |
Resistance |
Each Half |
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2.3 |
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Ω |
Insulation Withstand (VCMV TEST) |
Primary to Secondary |
3,500 |
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V rms |
Capacitance |
Primary to Secondary |
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5 |
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pF |
Recommended Max Power |
Rated Performance |
1.0 |
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1.5 |
W |
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POWER SUPPLY |
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Supply Voltage (+5 V dcSYS and +5 V dcFLD) |
Rated Performance |
4.5 |
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5.5 |
V dc |
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Operating |
4.0 |
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5.75 |
V dc |
Power Dissipation Capacitance |
Effective, per Input, Either Side |
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8 |
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pF |
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Effective per Output, Either Side—No Load |
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28 |
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pF |
Quiescent Supply Current |
Each, +5 V dcSYS & FLD |
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4 |
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mA |
Supply Current |
All Lines @ 10 MHz (Sum of +5 V dcSYS & FLD) |
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18 |
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mA |
TEMPERATURE RANGE |
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°C |
Rated Performance (TA)5 |
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–25 |
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+85 |
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Storage (TSTG) |
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–40 |
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+85 |
°C |
NOTES
1For best performance, bypass +5 V dc supplies to com. at or near the device (0.01 F). +5 V dc supplies are also internally bypassed with 0.05 F.
2As 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 s after the point where +5 V dcSYS & FLD passes above 3.3 V.
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).
4Partial Discharge at 80 pC THLD.
5Supply Current will increase slightly, but otherwise the unit will function within specification to –40°C.
Specifications are subject to change without notice.
–2– |
REV. 0 |
AD260
ABSOLUTE MAXIMUM RATINGS*
Parameter |
Conditions |
Min |
Typ Max |
Units |
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Supply Voltage (+5 V dcSYS & FLD) |
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–0.5 |
+6.0 |
V |
DC Input Voltage (VIN MAX) |
Referred to +5 V dcSYS & FLD and 5 V RTNSYS & FLD Respectively |
–0.5 |
+0.5 |
V |
DC Output Voltage (VOUT MAX) |
Referred to +5 V RTNSYS & FLD and 5 V dcSYS & FLD Respectively |
–0.5 |
+0.5 |
V |
Clamp Diode Input Current (IIK) |
For VI < –0.5 V or VI > 5 V RTNSYS & FLD +0.5 V |
–25 |
+25 |
mA |
Clamp Diode Output Current (IOK) |
For VO < –0.5 V or VO > 5 V RTNSYS & FLD +0.5 V |
–25 |
+25 |
mA |
Output DC Current, per Pin (IOUT) |
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–25 |
+25 |
mA |
DC Current, VCC or GND (ICC or IGND) |
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–50 |
+50 |
mA |
Storage Temperature (TSTG) |
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–40 |
+85 |
°C |
Lead Temperature (Soldering, 10 sec) |
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+300 |
°C |
Electrostatic Protection (VESD) |
Per MIL-STD-883, Method 3015 |
4.5 |
5 |
kV |
*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods may effect device reliability.
I/O CONFIGURATIONS AVAILABLE
The AD260 is available in several configurations. The choice of model is determined by the desired number of input vs. output lines. All models have identical footprints with the power and enable pins always being in the same locations.
PIN FUNCTION DESCRIPTIONS
Pin |
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Mnemonic |
Function |
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1–5* |
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S0 Through S4 |
Digital Xmt or Rcv from F0 Through F4 |
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6 |
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ENABLESYS |
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System Output Enable/Three-State |
7 |
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+5 V dcSYS |
System Power Supply (+5 V dc Input) |
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8 |
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5 V RTNSYS |
System Power Supply Common |
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9–14 |
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Not Present On Unit |
15 |
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5 V RTNFLD |
Field Power Supply Common |
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16 |
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+5 V dcFLD |
Field Power Supply (+5 V Input) |
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17 |
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ENABLEFLD |
Field Output Enable/Three-State |
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18–22* |
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F0 Through F4 |
Digital Xmt or Rcv from S0 Through S4 |
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*Function of pin determined by model. Refer to Table I.
Caution: Use care in handling unit as contaminants on the bottom side of the unit or the circuit card to which it is mounted will lead to reduced breakdown voltage across the isolation barrier.
ORDERING GUIDE
PIN CONFIGURATION
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S1 |
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3 |
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4 |
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S3 |
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5 |
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S4 |
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SYSTEM 6 |
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ENABLE |
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SYS |
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7 |
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+5VdcSYS |
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8 |
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5V RTNSYS |
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9 |
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DRVA |
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DRVCT |
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11 |
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DRVB |
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BOTTOM VIEW |
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PWRBFLD |
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PWRCTFLD |
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PWRAFLD |
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5V RTNFLD |
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+5VdcFLD |
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FIELD |
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ENABLEFLD |
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F1 |
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19 |
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F2 |
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20 |
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F3 |
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21 |
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F4 |
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22 |
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Model Number |
Description |
Isolation Test Voltage |
Package Description |
Package Option |
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AD260AND-0 |
0 |
Inputs, 5 Outputs |
1.75 kV rms |
Plastic DIP |
ND-22 |
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AD260AND-1 |
1 |
Input, 4 Outputs |
1.75 kV rms |
Plastic DIP |
ND-22 |
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AD260AND-2 |
2 |
Inputs, 3 Outputs |
1.75 kV rms |
Plastic DIP |
ND-22 |
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AD260AND-3 |
3 |
Inputs, 2 Outputs |
1.75 kV rms |
Plastic DIP |
ND-22 |
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AD260AND-4 |
4 |
Inputs, 1 Output |
1.75 kV rms |
Plastic DIP |
ND-22 |
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AD260AND-5 |
5 |
Inputs, 0 Outputs |
1.75 kV rms |
Plastic DIP |
ND-22 |
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AD260BND-0 |
0 |
Inputs, 5 Outputs |
3.5 kV rms |
Plastic DIP |
ND-22 |
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AD260BND-1 |
1 |
Input, 4 Outputs |
3.5 kV rms |
Plastic DIP |
ND-22 |
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AD260BND-2 |
2 |
Inputs, 3 |
Outputs |
3.5 kV rms |
Plastic DIP |
ND-22 |
AD260BND-3 |
3 |
Inputs, 2 |
Outputs |
3.5 kV rms |
Plastic DIP |
ND-22 |
AD260BND-4 |
4 |
Inputs, 1 |
Output |
3.5 kV rms |
Plastic DIP |
ND-22 |
AD260BND-5 |
5 |
Inputs, 0 |
Outputs |
3.5 kV rms |
Plastic DIP |
ND-22 |
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CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD260 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING! |
ESD SENSITIVE DEVICE |
REV. 0 |
–3– |