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XTR115UA

Part # XTR115UA
Description CURRENT LOOP TRANSMITTER 8SOIC - Rail/Tube
Category IC
Availability In Stock
Qty 3
Qty Price
1 + $1.45066
Manufacturer Available Qty
Burr-Brown Corporation
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

XTR115, XTR116
7
SBOS124A
www.ti.com
V
PS
0.01µF
R
L
D
1
(1)
NOTE: (1) Zener Diode 36V: 1N4753A or Motorola
P6KE39A. Use lower voltage zener diodes with loop
power supply voltages less than 30V for increased
protection. See Over-Voltage Surge Protection.
Maximum V
PS
must be
less than minimum
voltage rating of zener
diode.
The diode bridge causes
a 1.4V loss in loop supply
voltage.
1N4148
Diodes
8
1
2
3
XTR115
XTR116
V
IN
V
REF
I
IN
I
RET
V
REG
V+
I
O
E
B
6
7
5
4
Q
1
R
IN
FIGURE 4. Reverse Voltage Operation and Over-Voltage Surge Protection.
REVERSE-VOLTAGE PROTECTION
The XTR115/6 low compliance voltage rating (7.5V) per-
mits the use of various voltage protection methods without
compromising operating range. Figure 4 shows a diode
bridge circuit which allows normal operation even when the
voltage connection lines are reversed. The bridge causes a
two diode drop (approximately 1.4V) loss in loop supply
voltage. This results in a compliance voltage of approxi-
mately 9V—satisfactory for most applications. A diode can
be inserted in series with the loop supply voltage and the V+
pin to protect against reverse output connection lines with
only a 0.7V loss in loop supply voltage.
OVER-VOLTAGE SURGE PROTECTION
Remote connections to current transmitters can sometimes be
subjected to voltage surges. It is prudent to limit the maximum
surge voltage applied to the XTR115/6 to as low as practical.
Various zener diode and surge clamping diodes are specially
designed for this purpose. Select a clamp diode with as low a
voltage rating as possible for best protection. For example, a
36V protection diode will assure proper transmitter operation
at normal loop voltages, yet will provide an appropriate level
of protection against voltage surges. Characterization tests on
several production lots showed no damage with loop supply
voltages up to 65V.
Most surge protection zener diodes have a diode character-
istic in the forward direction that will conduct excessive
current, possibly damaging receiving-side circuitry if the
loop connections are reversed. If a surge protection diode is
used, a series diode or diode bridge should be used for
protection against reversed connections.
RADIO FREQUENCY INTERFERENCE
The long wire lengths of current loops invite radio frequency
interference. RF can be rectified by the input circuitry of the
XTR115/6 or preceding circuitry. This generally appears as
an unstable output current that varies with the position of
loop supply or input wiring.
Interference may also enter at the input terminals. For
integrated transmitter assemblies with short connection to
the sensor, the interference more likely comes from the
current loop connections.
XTR115, XTR116
8
SBOS124A
www.ti.com
FIGURE 5. Stable Operation with Capacitive Load on V
REF
.
I
IN
2
I
RET
3
XTR115
XTR116
+5V
Regulator
R
2
25
R
LIM
E
5
4
B
6
V+
7
R
1
2.475k
R
L
V
LOOP
A1
Voltage
Reference
V
REG
V
REF
8
1
I = 100
I
IN
I
O
If capacitive loading must be placed on the V
REF
pin, one of the compensation schemes shown below must be used to ensure stable operation.
Values of capacitance must remain within the given ranges.
NOTE: (1) Required compensation components.
I
O
=
100 V
IN
R
IN
+
R
ISO
(1)
10
C
LF
(2.2µF to 22µF)
C
HF
(10pF to 0.5µF)
+
C
LF
(1)
(2.2µF to 22µF)
R
COMP
(1)
50
C
HF
(10pF to 0.5µF)
OR
I
LOAD
(0-2.5mA)
I
LOAD
(0-2.5mA)
PACKAGE OPTION ADDENDUM
www.ti.com
24-Jan-2013
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing
Pins Package Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Top-Side Markings
(4)
Samples
XTR115U ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
XTR115U/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
XTR115U/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
XTR115UA ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
A
XTR115UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
A
XTR115UA/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
A
XTR115UAE4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
A
XTR115UG4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
115U
XTR116U ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
116U
XTR116U/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
116U
XTR116U/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
116U
XTR116UA ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
116U
A
XTR116UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
116U
A
XTR116UA/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-3-260C-168 HR XTR
116U
A
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