參數(shù)資料
型號： XTR101AG
元件分類： 運動控制電子
英文描述： A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:4kSPS; Input Channels Per ADC:1; Data Interface:Serial; Package/Case:20-DIP; Interface Type:Serial; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: No
中文描述： 精密，低漂移的4 - 20mA二線制變送器
文件頁數(shù)： 14/15頁
文件大?。?/td> 195K
代理商： XTR101AG
XTR101
14
(9)
20.40
μ
A
16mA
(10)
40
R
S
123.3
3.16
X
10
5
3.16
X
10
3
0.1092V
CMRR
(
e
1
+ e
2
)/2 – 5V
V
CC
PSRR
DETAILED ERROR ANALYSIS
The ideal output current is
i
O IDEAL
= 4mA + K e
IN
K is the span (gain) term, (0.016
+ (40/R
S
)) (3)
In the XTR101 there are three major components of error:
1.
σ
O
= errors associated with the output stage.
2.
σ
S
= errors associated with span adjustment.
3.
σ
I
= errors associated with the input stage.
The transfer function including these errors is
i
O
ACTUAL
= (4mA +
σ
O
) + K (1 +
σ
S
)(e
IN
+
σ
I
) (4)
When this expression is expanded, second order terms
(
σ
S
σ
1
) dropped, and terms collected, the result is
i
O
ACTUAL
= (4mA +
σ
O
) + K e
IN
+ K
σ
I
+ K
σ
S
e
IN
(5)
The error in the output current is i
O
ACTUAL
– i
O IDEAL
and
can be found by subtracting equations (5) and (3).
i
O ERROR
=
σ
O
+ K
σ
1
+ K
σ
S
e
IN
(6)
This is a general error expression. The composition of each
component of error depends on the circuitry inside the
XTR101 and the particular circuit in which it is applied. The
circuit of Figure 9 will be used to illustrate the principles.
1.
σ
O
= I
OS RTO
(7)
2.
σ
S
=
ε
NONLINEARITY
+
ε
SPAN
(8)
3.
σ
I
= V
OSI
+ (I
B1
+ R
4
– I
B2
R
T
) +
+
The term in parentheses may be written in terms of offset
current and resistor mismatches as I
B1
R + I
OS
' R
4
.
V
OSI
* = input offset voltage
I
B1
*, I
B2
* = input bias current
I
OSI
* = input offset current
I
OS RTO
* = output offset current error
R = R
T
– R
4
= mismatch in resistor
V
CC
= change supply voltage between
pins 7 and 8 away from 24V nominal
PSRR* = power supply rejection ratio
CMRR* = common-mode rejection ratio
ε
NONLIN
* = span nonlinearity
ε
SPAN
* = span equation error. Untrimmed error
= 5% max. May be trimmed to zero.
Items marked with an asterisk (*) can be found in the
Electrical Specifications.
EXAMPLE 3
The circuit in Figure 9 with the XTR101BG specifications
and the following conditions: R
T
= 109.4
at 25
°
C, R
T
=
156.4
at 150
°
C, I
O
= 4mA at 25
°
C, I
O
= 20mA at 150
°
C,
R
S
= 123.3
, R
4
= 109
, R
L
= 250
, R
LINE
= 100
, V
DI
=
0.6V, V
PS
= 24V
±
0.5%. Determine the % error at the upper
and lower range values.
(
e
1
+ e
2
)/2 – 5V
CMRR
A. AT THE LOWER RANGE VALUE (T = +25
°
C).
σ
O
= I
OS RTO
=
±
6
μ
A
σ
I
= V
OSI
+ (I
B1
R + I
OS1
R
4
) +
+
R = R
T 25
°
C
– R
4
= 109.4 – 109
≈
0
V
CC
= (24
X
0.005) + 4mA (250
+ 100
) + 0.6V
= 120mV + 1400mV + 600mV
= 2120mV
e
1
= (2mA
X
2.5k
) + (1mA
X
109
) = 5.109V
e
2
= (2mA
X
2.5k
) + (1mA
X
109.4
)
= 5.1094V
(e
1
+ e
2
)/2 – 5 = 0.1092V
PSRR = 3.16 X 10
5
for 110dB
CMRR = 31.6 X 10
3
for 90dB
σ
1
= 30
μ
V + (150nA
X
0 + 20nA
X
109
)
+ 2120mV
= 30
μ
V + 2.18
μ
V + 6.7
μ
V + 3.46
μ
V
= 42.34
μ
V
σ
S
=
ε
NONLIN
+
ε
SPAN
= 0.0001 + 0 (assumes trim of R
S
)
I
O
error =
σ
O
+ K
σ
I
+ K
σ
S
e
IN
K = 0.016 + = 0.016 + 40
e
IN
= e
2
– V
4
= I
REF1
R
T 25
°
C
– I
REF2
R
4
since R
T 25
°
C
= R
4
,
e
IN
= (I
REF1
– I
REF2
) R
4
= 0.4
μ
A
X
109
= 43.6
μ
V
Since the maximum mismatch of the current references is
0.04% of 1mA = 0.4
μ
A,
I
O
error = 6
μ
A + (0.34
X
42.34
μ
V) + (0.34
X
0.0001
X
43.6
μ
V) = 6
μ
A + 14.40
μ
A + 0.0015
μ
A
= 20.40
μ
A
% error =
X
100%
0.13% of span at lower range value.
B. AT THE UPPER RANGE VALUE (T = +150
°
C).
R = R
T 150
°
C
– R
4
= 156.4 – 109.4 = 47
V
CC
= (24
X
0.005) + 20mA (250
+ 100
) +
0.6V = 7720mV
e
1
= 5.109V
e
2
= (2mA
X
2.5k
) + (1mA
X
156.4
) = 5.156V
(e
1
+ e
2
)/2 – 5V = 0.1325V
V
CC
PSRR
相關(guān)PDF資料
PDF描述
XTR101AP A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:4000SPS; Input Channels Per ADC:1; Data Interface:Serial; Package/Case:20-SOIC; DNL +/-:0.5LSB; Interface Type:Serial; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: Yes
XTR101AU A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:200SPS; Input Channels Per ADC:2; Input Channel Type:Differential; Data Interface:Serial; Package/Case:20-DIP; Leaded Process Compatible:No; No. of Bits:20; No. of Channels:2 RoHS Compliant: No
XTR101BG A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:200SPS; Input Channels Per ADC:2; Input Channel Type:Differential; Data Interface:Serial; Package/Case:20-SOIC; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: No
XTR110BG PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER
XTR110KP PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XTR101AG 制造商:Texas Instruments 功能描述:Instrumentation Amplifier IC 制造商:Texas Instruments 功能描述:IC, TWO-WIRE TRANSMITTER, DIP-14
XTR101AP 功能描述:電流靈敏放大器 Prec Lo-Drift 4-20mA 2-Wire Trnsmtr 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
XTR101AP 制造商:BURR-BROWN 功能描述:PRECISION TRANSMITTER DIP14 101 制造商:Texas Instruments 功能描述:PRECISION TRANSMITTER DIP14 101 制造商:Texas Instruments 功能描述:PRECISION TRANSMITTER, DIP14, 101 制造商:Texas Instruments 功能描述:PRECISION TRANSMITTER, DIP14, 101; Supply Voltage Min:11.6V; Supply Voltage Max:40V; No. of Pins:14; Operating Temperature Min:-40C; Operating Temperature Max:85C; SVHC:No SVHC (19-Dec-2012); Accuracy:5%; Amplifier Case Style:DIP; ;RoHS Compliant: Yes
XTR101AP 制造商:Texas Instruments 功能描述:Transceiver IC
XTR101APG4 功能描述:電流靈敏放大器 Prec Lo-Drift 4-20mA 2-Wire Trnsmtr 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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