SAMPLE ERROR CALCULATION
RTD value at 4mA Output (RRTD
RTD Measurement Range
Ambient Temperature Range (∆TA
Supply Voltage Change (∆V+)
)
100Ω
200°C
20°C
5V
MIN
)
Common-Mode Voltage Change (∆CM)
0.1V
ERROR
(ppmofFullScale)
SAMPLE
ERROR CALCULATION(1)
ERROR SOURCE
ERROR EQUATION
UNADJ.
ADJUST.
INPUT
Input Offset Voltage
vs Common-Mode
Input Bias Current
Input Offset Current
V
OS/(VIN MAX) • 106
100µV/(800µA • 0.38Ω/°C • 200°C) • 106
50µV/V • 0.1V/(800µA • 0.38Ω/°C • 200°C) • 106
0.025µA/800µA • 106
1645
82
31
0
82
0
CMRR • ∆CM/(VIN MAX) • 106
IB/IREF • 106
IOS • RRTD MIN/(VIN MAX) • 106
3nA • 100Ω/(800µA • 0.38Ω/°C • 200°C) • 106
5
0
Total Input Error:
1763
82
EXCITATION
Current Reference Accuracy
vs Supply
IREF Accuracy (%)/100% • 106
(IREF vs V+) • ∆V+
0.2%/100% • 106
25ppm/V • 5V
2000
125
1316
0
125
0
Current Reference Matching
IREF Matching (%)/100% • 800µA •
RRTD MIN/(VIN MAX) • 106
0.1%/100% • 800µA • 100Ω/(800µA • 0.38Ω/°C • 200°C) • 106
vs Supply
(IREF matching vs V+) • ∆V+ •
10ppm/V • 5V • 800µA • 100Ω/(800µA • 0.38Ω/°C • 200°C)
66
66
RRTD MIN/(VIN
)
MAX
Total Excitation Error:
3507
191
GAIN
Span
Nonlinearity
Span Error (%)/100% • 106
Nonlinearity (%)/100% • 106
0.2%/100% • 106
0.01%/100% • 106
Total Gain Error:
2000
100
2100
0
100
100
OUTPUT
Zero Output
vs Supply
(IZERO - 4mA)/16000µA • 106
(IZERO vs V+) • ∆V+/16000µA • 106
25µA/16000µA • 106
0.2µA/V • 5V/16000µA • 106
Total Output Error:
1563
63
1626
0
63
63
DRIFT (∆TA = 20°C)
Input Offset Voltage
Input Bias Current (typical)
Input Offset Current (typical)
Current Reference Accuracy
Current Reference Matching
Span
Drift • ∆TA/(VIN MAX) • 106
Drift • ∆TA/800µA • 106
Drift • ∆TA • RRTD MIN/(VIN MAX) • 106
Drift • ∆TA
1.5µV/°C • 20°C/(800µA • 0.38Ω/°C • 200°C) • 106
20pA/°C • 20°C/800µA • 106
5pA/°C • 20°C • 100W/(800µA • 0.38Ω/°C • 200°C) • 106
35ppm/°C • 20°C
493
0.5
493
0.5
0.2
0.2
700
395
500
626
2715
700
395
500
626
2715
Drift • ∆TA • 800µA • RRTD MIN/(VIN
)
15ppm/°C • 20°C • 800µA • 100Ω/(800µA • 0.38Ω/°C • 200°C)
25ppm/°C • 20°C
MAX
Drift • ∆TA
Drift • ∆TA/16000µA • 106
Zero Output
0.5µA/°C • 20°C/16000µA • 106
Total Drift Error:
NOISE (0.1 to 10Hz, typ)
Input Offset Voltage
Current Reference
Zero Output
vn/(VIN MAX) • 106
IREF Noise • RRTD MIN/(VIN MAX) • 106
IZERO Noise/16000µA • 106
0.6µV/(800µA • 0.38Ω/°C • 200°C) • 106
3nA • 100Ω/(800µA • 0.38Ω/°C • 200°C) • 106
0.03µA/16000µA • 106
10
5
2
10
5
2
Total Noise Error:
17
17
TOTAL ERROR:
11728
3168
(1.17%)
(0.32%)
NOTE (1): All errors are min/max and referred to input unless otherwise stated.
TABLE II. Error Calculation.
®
XTR105
11
BB [ BURR-BROWN CORPORATION ]
