potentiometer sets its output range to 0-1V. The 2.5k鈩?/div>
gion.
/62.5鈩?/div>
Where:
I
O
= current loop output (A)
V
IN
= Differential IA input voltage between
pins 3 and 4 (V)
The XTR101 directly converts the 0-1V position sensor
output into a 4-20mA current loop output. The isolated
voltage output from the ISO122 is 0-5V for 0-50mm dis-
placement.
Other, more specialized two-wire transmitters are also avail-
able. See the brief summary at right of available building
blocks.
HPR117
LOW-COST ISOLATED DC/DC CONVERTER
Provides
鹵15V,
30mA isolated output power with 15V
input. Key specifications are:
鹵V
OUT
= V
IN
,
鹵5%
(V
IN
= 13.5V to 16.5V, I
OUT
= 25mA)
I
OUT
= 30mA continuous at 70擄C.
8mA quiescent current, no load; 80% efficiency, full load
750VDC isolation rating
ISO122
LOW-COST PRECISION ISOLATION AMPLIFIER
Precision analog isolation amplifier in a standard 16-pin
plastic DIP. Key specifications are:
Unity gain (鹵10V in to
鹵10V
out),
鹵0.05%
0.02% max nonlinearity
5mA quiescent current
140dB isolation mode rejection at 60Hz
1500Vrms continuous isolation rating (100% tested)
RCV420
Self-contained 4-20mA receiver. Conditions and offsets
4-20mA input signals to give a precision 0-5V output.
Contains precision voltage reference, 75鈩?precision sense
resistor and
鹵40V
common-mode input range difference
amplifier. The RCV420 has a total combined span and zero
error of less than 0.1%鈥攁djustable to zero.
XTR101
General purpose two-wire 4-20mA current-loop transmitter.
This transmitter has an instrumentation amplifier input and
two 1mA current sources for transducer excitation and
offsetting.
XTR103
Two-wire RTD 4-20mA current-loop transmitter with 9V
compliance. Similar to XTR101, but with internal lineariza-
tion circuitry for direct interface to RTDs (Resistance Tem-
perature Detectors). The XTR103, along with an RTD,
forms a precision temperature to 4-20mA current-loop trans-
mitter. Along with an RTD, the XTR103 can achieve better
than 0.1% span linearity over a 鈥?00擄C to +850擄C tempera-
ture span.
XTR104
Two-wire bridge 4-20mA current-loop transmitter with 9V
compliance. Similar to XTR101, but with shunt regulator
and linearization circuitry for direct interface to resistor
transducer bridges. The XTR104 can provide better than
0.1% span linearity from bridges with uncorrected linearity
in excess of 2%.
漏
1991 Burr-Brown Corporation
AB-032A
Printed in U.S.A. June, 1992
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