SAMPLE ERROR CALCULATION FOR XTR112(1)
參數(shù)資料
型號(hào)： XTR114U/2K5
廠商： Texas Instruments
文件頁(yè)數(shù)： 5/18頁(yè)
文件大?。?/td> 0K
描述： IC 4-20MA I-TRANSMITTER 14-SOIC
標(biāo)準(zhǔn)包裝： 2,500
類型： 電流發(fā)送器
輸入類型： 電壓
輸出類型： 電壓
接口： 2 線
電流 - 電源： 20mA
安裝類型： 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)
13
XTR112, XTR114
TABLE IV. Error Calculation.
SAMPLE ERROR CALCULATION FOR XTR112(1)
RTD value at 4mA Output (RRTD MIN)
1000
RTD Measurement Range
200
°C
Ambient Temperature Range (
T
A)20°C
Supply Voltage Change (
V+)
5V
Common-Mode Voltage Change (
CM)
0.1V
SAMPLE
ERROR SOURCE
ERROR EQUATION
ERROR CALCULATION(2)
UNADJ.
ADJUST.
INPUT
Input Offset Voltage
VOS/(VIN MAX) 106
100
V/(250A 3.8/°C 200°C) 106
526
0
vs Common-Mode
CMRR
CM/(V
IN MAX) 10
6
50
V/V 0.1V/(250A 3.8/°C 200°C) 106
26
Input Bias Current
IB/IREF 106
0.025
A/250A 106
100
0
Input Offset Current
IOS RRTD MIN/(VIN MAX) 106
3nA 1000
/(250A 3.8/°C 200°C) 106
16
0
Total Input Error:
668
26
EXCITATION
Current Reference Accuracy
IREF Accuracy (%)/100% 106
0.2%/100% 106
2000
0
vs Supply
(IREF vs V+) V+
25ppm/V 5V
125
Current Reference Matching
IREF Matching (%)/100% IREF
0.1%/100% 250
A 1000/(250A 3.8/°C 200°C) 106
1316
0
RRTD MIN/(VIN MAX) 106
vs Supply
(IREF matching vs V+) V+
10ppm/V 5V 250
A 1000/(250A 3.8/°C 200°C)
66
RRTD MIN/(VIN MAX)
Total Excitation Error:
3507
191
GAIN
Span
Span Error (%)/100% 106
0.2%/100% 106
2000
0
Nonlinearity
Nonlinearity (%)/100% 106
0.01%/100% 106
100
Total Gain Error:
2100
100
OUTPUT
Zero Output
(IZERO - 4mA)/16000A 106
25
A/16000A 106
1563
0
vs Supply
(IZERO vs V+) V+/16000A 106
0.2
A/V 5V/16000A 106
63
Total Output Error:
1626
63
DRIFT (
T
A = 20°C)
Input Offset Voltage
Drift
T
A/(VIN MAX) 10
6
1.5
V/°C 20°C/(250A 3.8/°C 200°C) 106
158
Input Bias Current (typical)
Drift
T
A/IREF 10
6
20pA/
°C 20°C/250A 106
22
Input Offset Current (typical)
Drift
T
A RRTD MIN/(VIN MAX) 10
6
5pA/
°C 20°C 1000/(250A 3.8/°C 200°C) 106
0.5
Current Reference Accuracy
Drift
T
A
35ppm/
°C 20°C
700
Current Reference Matching
Drift
T
A IREF RRTD MIN/(VIN MAX)
15ppm/
°C 20°C 250A 1000/(250A 3.8/°C 200°C)
395
Span
Drift
T
A
25ppm/
°C 20°C
500
Zero Output
Drift
T
A/16000A 10
6
0.5
A/°C 20°C/16000A 106
626
Total Drift Error:
2382
NOISE (0.1Hz to 10Hz, typ)
Input Offset Voltage
vn/(VIN MAX) 106
0.6
V/(250A 3.8/°C 200°C) 106
33
Current Reference
IREF Noise RRTD MIN/(VIN MAX) 106
3nA 1000
/(250A 3.8/°C 200°C) 106
16
Zero Output
IZERO Noise/16000A 106
0.03
A/16000A 106
22
Total Noise Error:
21
TOTAL ERROR:
10304
2783
(1.03%)
(0.28%)
NOTES: (1) For XTR114, IREF = 100A. Total unadjusted error is 1.16%, adjusted error 0.31%. (2) All errors are min/max and referred to input, unless
otherwise stated.
ERROR
(ppm of Full Scale)
REVERSE-VOLTAGE PROTECTION
The XTR112’s and XTR114’s low compliance rating (7.5V)
permits the use of various voltage protection methods with-
out 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. If 1.4V drop
in loop supply is too much, a diode can be inserted in series
with the loop supply voltage and the V+ pin. This protects
against reverse output connection lines with only a 0.7V loss
in loop supply 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 XTR 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
three production lots showed no damage to the XTR112 or
XTR114 within loop supply voltages up to 65V.
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