Datasheet

AD5421 Data Sheet
Rev. G | Page 4 of 36
SPECIFICATIONS
Loop voltage = 24 V; REFIN = 2.5 V external; R
L
= 250 Ω; external NMOS connected; all loop current ranges; all specifications
T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
1
Min Typ Max Unit Test Conditions/Comments
ACCURACY, INTERNAL R
SET
Resolution 16 Bits
Total Unadjusted Error (TUE)
2
−0.126 +0.126 % FSR C grade
−0.041 ±0.0064 +0.041 % FSR C grade, T
A
= 25°C
−0.18 +0.18 % FSR B grade
−0.06 ±0.011 +0.06 % FSR B grade, T
A
= 25°C
−0.27 +0.27 % FSR A grade
−0.08 ±0.011 +0.08 A grade, T
A
= 25°C
TUE Long-Term Stability 210 ppm FSR Drift after 1000 hours at T
A
= 125°C
Relative Accuracy (INL) −0.0035 ±0.0015 +0.0035 % FSR C grade
−0.012 ±0.006 +0.012 % FSR B grade
−0.024
±0.01
+0.024
% FSR
A grade
Differential Nonlinearity (DNL) −1 +1 LSB Guaranteed monotonic
Offset Error −0.056 +0.056 % FSR B grade and C grade
−0.008 ±0.0008 +0.008 % FSR B grade and C grade, T
A
= 25°C
−0.11 ±0.0008 +0.11 % FSR A grade
Offset Error TC
3
1 ppm FSR/°C
Gain Error
−0.107
+0.107
% FSR
B grade and C grade
−0.035 ±0.0058 +0.035 % FSR B grade and C grade, T
A
= 25°C
−0.2 ±0.0058 +0.2 % FSR A grade
Gain Error TC
3
4 ppm FSR/°C
Full-Scale Error −0.126 +0.126 % FSR B grade and C grade
−0.041
±0.0065
+0.041
% FSR
B grade and C grade, T
A
= 25°C
−0.25 ±0.0065 +0.25 % FSR A grade
Full-Scale Error TC
3
5 ppm FSR/°C
Downscale Alarm Current 3.19 3.21 mA
Upscale Alarm Current 22.77 22.83 mA
4 mA to 20 mA and 3.8 mA to 21 mA
ranges
23.97
24.03
mA
3.2 mA to 24 mA range
ACCURACY, EXTERNAL R
SET
(24 kΩ)
Assumes ideal resistor, B grade and
C grade only; not specified for A grade
Resolution 16 Bits
Total Unadjusted Error (TUE)
2
−0.048 +0.048 % FSR C grade
−0.027 ±0.002 +0.027 % FSR C grade, T
A
= 25°C
−0.08 +0.08 % FSR B grade
−0.04 ±0.003 +0.04 % FSR B grade, T
A
= 25°C
TUE Long-Term Stability 40 ppm FSR Drift after 1000 hours at T
A
= 125°C
Relative Accuracy (INL) −0.0035 ±0.0015 +0.0035 % FSR C grade
−0.012 ±0.006 +0.012 % FSR B grade
Differential Nonlinearity (DNL) −1 +1 LSB Guaranteed monotonic
Offset Error −0.021 +0.021 % FSR
−0.007 ±0.0012 +0.007 % FSR T
A
= 25°C
Offset Error TC
3
0.5
ppm FSR/°C
Gain Error −0.03 +0.03 % FSR
−0.023 ±0.0006 +0.023 % FSR T
A
= 25°C