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XTR116 데이터시트 PDF




Burr-Brown Corporation에서 제조한 전자 부품 XTR116은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 XTR116 자료 제공

부품번호 XTR116 기능
기능 4-20mA CURRENT LOOP TRANSMITTERS
제조업체 Burr-Brown Corporation
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XTR116 데이터시트, 핀배열, 회로
®
XTR116
XTR115
XTR115
XTR116
For most current data sheet and other product
information, visit www.burr-brown.com
4-20mA CURRENT LOOP TRANSMITTERS
FEATURES
q LOW QUIESCENT CURRENT: 200µA
q 5V REGULATOR FOR EXTERNAL CIRCUITS
q VREF FOR SENSOR EXCITATION:
XTR115: 2.5V
XTR116: 4.096V
q LOW SPAN ERROR: 0.05%
q LOW NONLINEARITY ERROR: 0.003%
q WIDE LOOP SUPPLY RANGE: 7.5V to 36V
q SO-8 PACKAGE
DESCRIPTION
The XTR115 and XTR116 are precision current out-
put converters designed to transmit analog 4-to-20mA
signals over an industry standard current loop. They
provide accurate current scaling and output current
limit functions.
The on-chip voltage regulator (5V) can be used to
power external circuitry. A precision on-chip VREF
(2.5V for XTR115 and 4.096V for XTR116) can be
APPLICATIONS
q 2-WIRE, 4-20mA CURRENT LOOP
TRANSMITTER
q SMART TRANSMITTER
q INDUSTRIAL PROCESS CONTROL
q TEST SYSTEMS
q COMPATIBLE WITH HART MODEM
q CURRENT AMPLIFIER
q VOLTAGE-TO-CURRENT AMPLIFIER
used for offsetting or to excite transducers. A current
return pin (IRET) senses any current used in external
circuitry to assure an accurate control of the output
current.
The XTR115 is a fundamental building block of
smart sensors using 4-to-20mA current transmission.
The XTR115 and XTR116 are specified for opera-
tion over the extended industrial temperature range,
–40°C to +85°C.
+5V
XTR115: 2.5V
XTR116: 4.096V
VREG
8
VREF
1
XTR115
XTR116
+5V
Regulator
Voltage
Reference
V+
7
RIN IIN
2
+
A1
VIN
3
IRET
R1
2.475k
B
6
RLIM
R2
25
E
5
IO =
100 VIN
RIN
4
I = 100 • IIN
VLOOP
RL
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©2000 Burr-Brown Corporation
PDS-11582A
XTR115,PriXnteTd Rin U1.S1.A6. January, 2000
®




XTR116 pdf, 반도체, 판매, 대치품
TYPICAL PERFORMANCE CURVES
At TA = +25°C, V+ = 24V, RIN = 20k, and TIP29C external transistor, unless otherwise noted.
40
30
20
10
10k
CURRENT GAIN vs FREQUENCY
COUT = 0
RL = 0
COUT = 10nF
RL = 250
100k
Frequency (Hz)
1M
QUIESCENT CURRENT vs TEMPERATURE
260
240
(V+) = 36V
220
(V+) = 24V
200
(V+) = 7.5V
180
160
–75 –50 –25
0
25 50 75 100 125
Temperature (°C)
REFERENCE VOLTAGE vs TEMPERATURE
0.1
0
–0.1
–0.2
–0.3
–75 –50 –25 0 25 50 75 100 125
Temperature (°C)
OVER-SCALE CURRENT vs TEMPERATURE
34
With External Transistor
33
32
V+ = 36V
31
V+ = 7.5V
30
V+ = 24V
29
28
–75 –50 –25
0
25 50
Temperature (°C)
75 100 125
VREG VOLTAGE vs VREG CURRENT
5.5
+125°C
–55°C
5.0
+25°C
+25°C –55°C
Sinking Sourcing
Current Current
4.5
–1
012
IREG Current (mA)
+125°C
34
®
XTR115, XTR116
4

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XTR116 전자부품, 판매, 대치품
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.
8
VREG
1
VREF
V+
7
Maximum VPS must be
less than minimum
voltage rating of zener
diode.
RIN 2
XTR115
IIN XTR116
B6
Q1
0.01µF
D1(1)
1N4148
Diodes
VIN E
5
3
IRET
IO 4
The diode bridge causes
a 1.4V loss in loop supply
voltage.
RL
VPS
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.”
FIGURE 4. Reverse Voltage Operation and Over-Voltage Surge Protection.
®
7 XTR115, XTR116

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