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參數(shù)資料
| 型號(hào)： | XTR114U/2K5 |
| 廠商： | Texas Instruments |
| 文件頁(yè)數(shù)： | 4/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC 4-20MA I-TRANSMITTER 14-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | 電流發(fā)送器 |
| 輸入類(lèi)型： | 電壓 |
| 輸出類(lèi)型： | 電壓 |
| 接口： | 2 線(xiàn) |
| 電流 - 電源： | 20mA |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
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12
XTR112, XTR114
A typical two-wire RTD application with linearization is
shown in Figure 1. Resistor RLIN1 provides positive feed-
back and controls linearity correction. RLIN1 is chosen ac-
cording to the desired temperature range. An equation is
given in Figure 1.
In three-wire RTD connections, an additional resistor, RLIN2,
is required. As with the two-wire RTD application, RLIN1
provides positive feedback for linearization. RLIN2 provides
an offset canceling current to compensate for wiring resis-
tance encountered in remotely located RTDs. RLIN1 and RLIN2
are chosen such that their currents are equal. This makes the
voltage drop in the wiring resistance to the RTD a common-
mode signal which is rejected by the XTR112 and XTR114.
The nearest standard 1% resistor values for RLIN1 and RLIN2
should be adequate for most applications. Tables II and III
provide the 1% resistor values for a three-wire Pt1000 RTD
connection.
If no linearity correction is desired, the VLIN pin should be
left open. With no linearization, RG = 2500 VFS, where
VFS = full-scale input range.
RTDs
The text and figures thus far have assumed a Pt1000 RTD.
With higher resistance RTDs, the temperature range and
input voltage variation should be evaluated to ensure proper
common-mode biasing of the inputs. As mentioned earlier,
RCM can be adjusted to provide an additional voltage drop to
bias the inputs of the XTR112 and XTR114 within their
common-mode input range.
ERROR ANALYSIS
Table IV shows how to calculate the effect various error
sources have on circuit accuracy. A sample error calculation
for a typical RTD measurement circuit (Pt1000 RTD, 200
°C
measurement span) is provided. The results reveal the
XTR112’s and XTR114’s excellent accuracy, in this case 1%
unadjusted for the XTR112, 1.16% for the XTR114. Adjusting
resistors RG and RZ for gain and offset errors improves the
XTR112’s accuracy to 0.28% (0.31% for the XTR114). Note
that these are worst-case errors; guaranteed maximum values
were used in the calculations and all errors were assumed to be
positive (additive). The XTR112 and XTR114 achieve perfor-
mance which is difficult to obtain with discrete circuitry and
requires less space.
OPEN-CIRCUIT PROTECTION
The optional transistor Q2 in Figure 3 provides predictable
behavior with open-circuit RTD connections. It assures that if
any one of the three RTD connections is broken, the XTR’s
output current will go to either its high current limit (
≈ 27mA)
or low current limit (
≈ 1.3mA for XTR112 and ≈ 1mA for
XTR114). This is easily detected as an out-of-range condition.
FIGURE 3. Three-Wire Connection for Remotely Located RTDs.
I
O
I
O
XTR112
XTR114
OPEN RTD
TERMINAL
1
≈ 1.3mA
≈ 1mA
2
≈ 27mA
3
≈ 1.3mA
≈ 1mA
RTD
(R
LINE2)(RLINE1)
R
Z
(1)
R
LIN2
(1)
R
LIN1
(1)
(R
LINE3)
2
1
3
0.01
F
R
CM
0.01
F
Q
2
(2)
2N2222
NOTES: (1) See Table I for resistor equations and
1% values. (2) Q
2 optional. Provides predictable
output current if any one RTD connection is
broken:
13
4
3
2
R
G
XTR112
XTR114
7
6
(1)
R
G
R
G
V
IN
–
V
IN
+
V
LIN I
R1
I
R2
V
REG
V+
I
RET
I
O
E
B
8
9
Q
1
I
O
I
O
14
11
12
1
10
EQUAL line resistances here
creates a small common-mode
voltage which is rejected by
XTR112 and XTR114.
Resistance in this line causes
a small common-mode voltage
which is rejected by XTR112
and XTR114.
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| XTR114UA | 功能描述:電流靈敏放大器 4-20mA Crnt Trnsmtr w/Sensor Exc & Lin 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 |
| XTR114UA/2K5 | 功能描述:IC 4-20MA I-TRANSMITTER 14-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類(lèi)型:觸控式傳感器 輸入類(lèi)型:數(shù)字 輸出類(lèi)型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類(lèi)型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
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