Analog Devices AD260AND-1, AD260 Datasheet

High Speed, Logic Isolator

S0

1

F3

21

SYSTEM

FIELD

+5Vdc

5Vdc RTN

DRIVE

+5Vdc

5Vdc RTN

17V p-p OUT

CT OUT

17V p-p OUT

S1

2

S2

3

S3

S4

DRVA

F0

F1

F2

F4

19

20

22

15

16

18

6

7

8

4

5

AD260

+5V

DRVCT

DRIVE

DRVB

TRISTATE

LATCH

E

D

LINE 2

TRISTATE

LATCH

E

D

LINE 1

TRISTATE

LATCH

E

TRISTATE

D

LINE 0

13

14 9

12

10

11

LATCH

D

E

LINE 4

TRISTATE

LATCH

D

E

LINE 3

TRISTATE

+5Vdc

FLD

5V RTN

FLD

ENABLE

FLD

PWRA

FLD

PWRCT

FLD

PWRB

FLD

5V RTN

SYS

+5Vdc

SYS

ENABLE

SYS

17

a

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/␮s Min
Waveform Edge Transmission Symmetry: ⴞ1 ns
Field and System Output Enable/Three-State Functions
Performance Rated Over –25ⴗC to +85ⴗC
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 accu-

rately 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

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.

with Power Transformer

AD260

FUNCTIONAL BLOCK DIAGRAM

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 de-

sired 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% pro­duction tested at 3.5 kV rms, using a standard ADI test method.

High Transient Immunity: The AD260 rejects common-

mode transients slewing at up to 10 kV/µs without false trigger-

ing or damage to the device.

(Continued on page 6)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1998

AD260–SPECIFICATIONS

(Typical at TA = +25ⴗC, +5 V dc

, +5 V dc

SYS

, tRR = 50 ns max unless otherwise noted)

FLD

Parameter Conditions Min Typ Max Units

INPUT CHARACTERISTICS

Threshold Voltage

Positive Transition (V

) +5 V dc

T+

+5 V dc

Negative Transition (V

) +5 V dc

T–

+5 V dc

Hysteresis Voltage (V

) +5 V dc

H

+5 V dc
Input Capacitance (C
Input Bias Current (I

OUTPUT CHARACTERISTICS

Output Voltage

) 5pF

IN

) Per Input 0.5 µA

IN

1

High Level (VOH) +5 V dc

+5 V dc

Low Level (V

) +5 V dc

OL

+5 V dc
Output Three-State Leakage Current ENABLE

1

DYNAMIC RESPONSE

Max Logic Signal Frequency (f
Waveform Edge Symmetry Error (t
Logic Edge Propagation Delay (t
Minimum Pulsewidth (t
Max Output Update Delay on Fault or After

Power-Up Reset Interval (≈ 30 µs)

ISOLATION BARRIER RATING

Operating Isolation Voltage (V

Isolation Rating Test Voltage (V

(Refer to Figure 2)

) 50% Duty Cycle, +5 V dc

MIN

) 25 ns

PWMIN

CMV

)t

PHL

3

ERROR

, t

2

PLH

PHL

)1425ns

) AD260A 375 V rms

AD260B 1250 V rms

4

)

CMV TEST

AD260A 1750 V rms

= 4.5 V 2.0 2.7 3.15 V

SYS

= 5.5 V 3.0 3.2 4.2 V

SYS

= 4.5 V 0.9 1.8 2.2 V

SYS

= 5.5 V 1.2 2.2 3.0 V

SYS

= 4.5 V 0.4 0.9 1.4 V

SYS

= 5.5 V 0.5 1.0 1.5 V

SYS

= 4.5 V, |IO| = 0.02 mA 4.4 V

SYS

= 4.5 V, |IO| = 4 mA 3.7 V

SYS

= 4.5 V, |IO| = 0.02 mA 0.1 V

SYS

= 4.5 V, |IO| = 4 mA 0.4 V

SYS

@ Logic Low/High Level Respectively 0.5 µA

SYS/FLD

= 5 V 20 MHz

vs. t

PLH

SYS

±1ns

12 µs

AD260B 3500 V rms
Transient Immunity (V

TRANSIENT

Isolation Mode Capacitance (C
Capacitive Leakage Current (I

) 10,000 V/µs

) Total Capacitance, All Lines and Transformer 14 18 pF

ISO

) 240 V rms @ 60 Hz 2 µA rms

LEAD

POWER TRANSFORMER

Primary Winding Bifilar Wound, Center-Tapped

Inductance (LP) Each Half 1 mH
Number of Turns (NP) Each Half 26 Turns

Resistance Each Half 0.6 Ω
Max Volt-Seconds (E × t) Each Half 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 kHz

Secondary Winding Bifilar Wound, Center-Tapped

Number of Turns (NS) Each Half 48 Turns

Resistance Each Half 2.3 Ω

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

SYS

) Rated Performance 4.5 5.5 V dc

FLD

Operating 4.0 5.75 V dc
Power Dissipation Capacitance Effective, per Input, Either Side 8 pF

Effective per Output, Either Side—No Load 28 pF
Quiescent Supply Current Each, +5 V dc
Supply Current All Lines @ 10 MHz (Sum of +5 V dc

TEMPERATURE RANGE

Rated Performance (T
Storage (T

NOTES

1

For best performance, bypass +5 V dc supplies to com. at or near the device (0.01 µF). +5 V dc supplies are also internally bypassed with 0.05 µF.

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 µs after the point where
+5 V dc

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.

) –40 +85 °C

STG

passes above 3.3 V.

5

)

A

SYS & FLD

)18 mA

SYS & FLD

–2–

4mA

–25 +85 °C

REV. 0

AD260

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Parameter Conditions Min Typ Max Units

Supply Voltage (+5 V dc
DC Input Voltage (V
DC Output Voltage (V

SYS & FLD

IN MAX

OUT MAX

Clamp Diode Input Current (I
Clamp Diode Output Current (IOK) For VO < –0.5 V or VO > 5 V RTN
Output DC Current, per Pin (I
DC Current, VCC or GND (ICC or I
Storage Temperature (T

STG

Lead Temperature (Soldering, 10 sec) +300 °C

Electrostatic Protection (V

*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 Mnemonic Function

1–5* S0 Through S4 Digital Xmt or Rcv from F0 Through F4
6 ENABLE
7 +5 V dc
8 5 V RTN

SYS

SYS

SYS

9–14 Not Present On Unit
15 5 V RTN
16 +5 V dc
17 ENABLE

FLD

FLD

FLD

18–22* F0 Through F4 Digital Xmt or Rcv from S0 Through S4

*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.

) –0.5 +6.0 V

) Referred to +5 V dc

) Referred to +5 V RTN

) For VI < –0.5 V or VI > 5 V RTN

IK

) –25 +25 mA

OUT

) –50 +50 mA

GND

SYS & FLD

SYS & FLD

and 5 V RTN

and 5 V dc

SYS & FLD

SYS & FLD

Respectively –0.5 +0.5 V

SYS & FLD

Respectively –0.5 +0.5 V

SYS & FLD

+0.5 V –25 +25 mA

+0.5 V –25 +25 mA

) –40 +85 °C

) Per MIL-STD-883, Method 3015 4.5 5 kV

ESD

PIN CONFIGURATION

1

S0

2

S1

3

S2

4

S3

5

S4

FIELD

6

ENABLE
+5Vdc
5V RTN
DRVA
DRVCT
DRVB

SYS

SYS

SYS

7
8

9
10
11

System Output Enable /Three-State
System Power Supply (+5 V dc Input)
System Power Supply Common

Field Power Supply Common
Field Power Supply (+5 V Input)
Field Output Enable/Three-State

PWRB

PWRCT

PWRA

5V RTN

+5Vdc

ENABLE

FLD
FLD
FLD
FLD
FLD
FLD

F0
F1
F2
F3
F4

SYSTEM

BOTTOM VIEW

12
13
14
15
16
17
18
19
20
21
22

ORDERING GUIDE

Model Number Description Isolation Test Voltage Package Description Package Option

AD260AND-0 0 Inputs, 5 Outputs 1.75 kV rms Plastic DIP ND-22
AD260AND-1 1 Input, 4 Outputs 1.75 kV rms Plastic DIP ND-22
AD260AND-2 2 Inputs, 3 Outputs 1.75 kV rms Plastic DIP ND-22
AD260AND-3 3 Inputs, 2 Outputs 1.75 kV rms Plastic DIP ND-22
AD260AND-4 4 Inputs, 1 Output 1.75 kV rms Plastic DIP ND-22
AD260AND-5 5 Inputs, 0 Outputs 1.75 kV rms Plastic DIP ND-22

AD260BND-0 0 Inputs, 5 Outputs 3.5 kV rms Plastic DIP ND-22
AD260BND-1 1 Input, 4 Outputs 3.5 kV rms Plastic DIP ND-22
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

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.

REV. 0

–3–