2B22_15 Datasheet, PDF (1/4 Pages) Analog Devices – HIGH PERGORMANCE ISOLATED VOLTAGE TO CURRENT CONVERTER

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Page 6
-. ANALOG
W DEVICES
HighPerfonnanceI,solated
Voltage-to-CurrenCtonverter
I
. 2822 I
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Wide Input Range: 0 to +1V to 0 to +10V
..~tandard Output Range: 4 to 2OmA
HighCMV Input/Output Isolation: 1500V de Continuous
Low Nonlinearity: 0.05% max, 2B22L
Low Span Drift: o.OO5%fCmax, 2B22L
SingleSupply: +14V to +32V
Meets IEEE Sui 472: Transient Protection (SWC)
Meets ISA S1II60.1: Isolated Current Loop Transmitters
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OB- SOLETE APPLICATIONS
Industrial Instrumentation and ProcessControl
Ground Loop Elimination
High Voltage Transient Protaction
D/A Convertar Current Loop Interface
Anelog T...nsmittan and Controllers
Remote Da1aAcquisition Systems
GENERAL DESCRIPTION
Model 2B22 is a high performance, compact voltagc-to-cur-
rent converter offering 1500Y dc input to output isolation in
interfacing standard process signals. The input stage of the
model 2B22 is single resistor programmable to accept voltage
ranges from 0 to +lV to 0 to +10Y. The isolated output cur-
rent range is 4 to 20mA, and the 2B22 can be operated with
0 to 100011 grounded or floating loads.
Using modulation techniques with transformer isolation for
reliable performance, the 2B22 is available in three accuracy
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meets the requirements of the Instrument Society of America
Std. 50.1 "Compatibility of Analog Signals for Electronic
Industrial Process InstrumentS" for Type 4, Class U isolated
current loop transmitters.
In the industrial environment, model 2B22 can serve as a
transmission link between such system elements as transmit-
ters, indicators, controllers, recorders, computers, actuators
and signal conditioners. In data acquisition and control sys-
tems, the 2822 may act as an isolated interface between the
selections offering guaranteed nonlinearity error (2B22L:
D/A converter output of a microcomputer and standard 4 to
fO.OS% max, 2B22K: :to. 1% max, and 2822J: :to.2% max)
'2OmA analog loops.
and guaranteed low span drift: :i:O.OOS%/oCmax, :to.Ol %tc
DESIGN FEATURES AND USER BENEFITS
max, and :to.01S%I'C max, respectively. The internally trim-
med span and offset errors are :to. 1% max for the 2822L and
:to.2S" max for the 2B22}/2B22K. Both span and offset are
adjustable by the optional external potentiometers.
High Reliability: Model 2B22 is a conservatively designed,
compact module capable of reliable operation in harsh
environments. To assure high reliability, the 2822 has a
calculated MT8F of over 270,000 hours and has been de-
Featuring a wide ransc. single supply operation (+ 14Y to
+32Y), the 2B22 provides isolated +28Y loop power and is
capable of delivering rated current into an external 0 to 100011
load resistance. The unique output stage configuration also al-
lows the user to urilize an optional cxremalloop power supply
to interface systems desjgncd for a two-wire operation.
APPUCATIONS
Model 2B22 has been specifically designed for high accuracy
signed to meet the IEEE Standard for Transient Voltage
Protection (472-1974: Surge Withstand Capability).
Process Signal Compatibility: The versatile input stage design
with a single resistor gain adjustment enables the 2822 to ac-
cept anyone of tbe standard inputs-o-IV. O-IOY, 1-5Y; or
I-SmA,4-20mA, la-SOmA; and provide standard, isolated
4-20mA output.
applications in process control and monitoring systems to offer
compkte galvanic isolation and protection against damage
from transientS and fault voltages in transmitting information
between subsystems or $Cparated system clementS. The 2B22
Isolated Loop Power. Internal28Y dc loop supply, completely
isolated from the input power terminals (:t1500V dc isolation),
provides the capability to drive 0 to 1000111oads and elimi-
nates the need for an external dc/dc converter.
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