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參數(shù)資料
| 型號： | XTR115U |
| 英文描述： | 4-20mA CURRENT LOOP TRANSMITTERS |
| 中文描述： | 4 - 20mA電流環(huán)遞質(zhì) |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 81K |
| 代理商： | XTR115U |
5
XTR115, XTR116
APPLICATIONS INFORMATION
The XTR115 and XTR116 are identical devices except for
the reference voltage output, pin 1. This voltage is available
for external circuitry and is not used internally. Further
discussions that apply to both devices will refer to the
“XTR115/6.”
Figure 1 shows basic circuit connections with representative
simplified input circuitry. The XTR115/6 is a two-wire
current transmitter. Its input signal (pin 2) controls the output
current. A portion of this current flows into the V+ power
supply, pin 7. The remaining current flows in Q1. External
input circuitry connected to the XTR115/6 can be powered
from V
REG
or V
REF
. Current drawn from these terminals
must be returned to I
RET
, pin 3. This I
RET
pin is a “l(fā)ocal
ground” for input circuitry driving the XTR115/6.
The XTR115/6 is a current-input device with a gain of 100.
A current flowing into pin 2 produces I
O
= 100 I
IN
. The
input voltage at the I
IN
pin is zero (referred to the I
RET
pin).
A voltage input is created with an external input resistor, as
shown. Common full-scale input voltages range from 1V
and upward. Full-scale inputs greater than 0.5V are recom-
mend to minimize the effect of offset voltage and drift of A1.
EXTERNAL TRANSISTOR
The external transistor, Q1, conducts the majority of the full-
scale output current. Power dissipation in this transistor can
approach 0.8W with high loop voltage (40V) and 20mA
output current. The XTR115/6 is designed to use an external
transistor to avoid on-chip thermal-induced errors. Heat
produced by Q1 will still cause ambient temperature changes
that can affect the XTR115/6. To minimize these effects,
locate Q1 away from sensitive analog circuitry, including
XTR115/6. Mount Q1 so that heat is conducted to the
outside of the transducer housing.
The XTR115/6 is designed to use virtually any NPN transis-
tor with sufficient voltage, current and power rating. Case
style and thermal mounting considerations often influence
the choice for any given application. Several possible choices
are listed in Figure 1. A MOSFET transistor will not improve
the accuracy of the XTR115/6 and is not recommended.
R
IN
20k
I
IN
2
V
IN
I
RET
3
XTR115
XTR116
+5V
Regulator
R
2
25
R
LIM
E
5
I
O
4
B
6
V+
7
R
1
2.475k
R
L
V
LOOP
A1
Voltage
Reference
V
REG
5V
V
REF
8
1
XTR115: 2.5V
XTR116: 4.096V
Possible choices for Q
1
(see text).
2N4922
TIP29C
TIP31B
TYPE
TO-225
TO-220
TO-220
PACKAGE
I = 100
I
IN
I
O
10nF
I
REF
I
IN
All return current
from I
REG
and I
REF
For I
O
= 4mA to 20mA
I
IN
= 40
μ
A to 200
μ
A
With R
IN
= 20k
V
IN
= 0.8V to 4V
I
REG
Q
1
CInput
FIGURE 1. Basic Circuit Connections.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XTR116U | 4-20mA CURRENT LOOP TRANSMITTERS |
| XTR116UA | 4-20mA CURRENT LOOP TRANSMITTERS |
| XWD1215 | DUAL OUTPUT, 180 WATT |
| XWD2405 | DUAL OUTPUT, 180 WATT |
| XWD2412 | DUAL OUTPUT, 180 WATT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XTR115U | 制造商:Texas Instruments 功能描述:IC's |
| XTR115U | 制造商:Texas Instruments 功能描述:IC CURRENT LOOP TRANSMITTER SOIC8 |
| XTR115U/2K5 | 功能描述:電流靈敏放大器 4-20mA Current Loop Transmitters RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| XTR115U/2K5E4 | 功能描述:電流靈敏放大器 4-20mA Current Loop Transmitters RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| XTR115UA | 功能描述:電流靈敏放大器 4-20mA Current Loop Transmitters RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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