a
High Speed, Logic Isolator
AD261
FEATURES
FUNCTIO NAL BLO CK D IAGRAM
Isolation Test Voltage: To 3.5 kV rm s
Five Isolated Logic Lines: Available in Six I/ O Configurations
Logic Signal Bandw idth: 20 MHz (m in)
CMV Transient Im m unity: 10 kV/ s m in
Waveform Edge Transm ission Sym m etry: ؎1 ns
Field and System Output Enable/ Three-State Functions
Perform ance Rated Over –25؇C to +85؇C
UL1950, IEC950, EN60950 Certification (VDE, CE, Pending)
LATCH
THREE-
F0
F1
F2
F3
F4
D
E
LINE 0
LINE 1
LINE 2
LINE 3
LINE 4
S0
STATE
LATCH
THREE-
STATE
D
E
2
3
4
S1
S2
LATCH
THREE-
STATE
D
E
APPLICATIONS
LATCH
PLC/ DCS Analog Input and Output Cards
Com m unications Bus Isolation
General Data Acquisition Applications
IGBT Motor Drive Controls
D
S3
S4
THREE-
STATE
E
LATCH
D
5
6
THREE-
STATE
E
High Speed Digital I/ O Ports
ENABLE
+5V dc
17
ENABLE
+5V dc
SYS
FLD
+5V dc
+5V dc
16
15
7
8
GENERAL D ESCRIP TIO N
FLD
SYS
T he 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.
5Vdc RTN
5Vdc RTN
5V RTN
5V RTN
SYS
FLD
FIELD
SYSTEM
TYPICAL MODEL
(AD261-2)
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.
P RO D UCT H IGH LIGH TS
Six Isolated Logic Line I/O Configurations Available: T he
AD261 is available in six pin-compatible versions of I/O con-
figurations to meet a wide variety of requirements.
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.
Wide Bandwidth with Minim al 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 k V r m s Test Volta ge Isola tion Ra tin g: T he 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.
T he isolation barrier of the AD261 B Grade is 100% tested
as high as 3.5 kV rms (system to field). T he 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.
High Tr a nsient Im m unity: T he AD261 rejects common-
mode transients slewing at up to 10 kV/µs without false trigger-
ing or damage to the device.
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. T his guarantees the output is always valid 10 µs after
a fault condition or after the power-up reset interval.
(Continued on page 5)
REV. 0
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1997
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