Datasheet

AD5421 Data Sheet
Rev. G | Page 8 of 36
Loop voltage = 24 V; REFIN = REFOUT1 (2.5 V internal reference); R
L
= 250 Ω; external NMOS connected; all loop current ranges;
all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter
1, 2
C Grade
Unit Test Conditions/Comments Min Typ Max
ACCURACY, INTERNAL R
SET
Total Unadjusted Error (TUE)
3
−0.157 +0.157 % FSR
−0.117 ±0.0172 +0.117 % FSR T
A
= 25°C
Relative Accuracy (INL) −0.004 +0.004 % FSR
−0.004 ±0.0015 +0.004 % FSR T
A
= 25°C
Offset Error −0.04 +0.04 % FSR
−0.025
±0.0025
+0.025
% FSR
T
A
= 25°C
Offset Error TC 1 ppm FSR/°C
Gain Error −0.128 +0.128 % FSR
−0.093 ±0.0137 +0.093 % FSR T
A
= 25°C
Gain Error TC 5 ppm FSR/°C
Full-Scale Error −0.157 +0.157 % FSR
−0.117 ±0.0172 +0.117 % FSR T
A
= 25°C
Full-Scale Error TC 6 ppm FSR/°C
ACCURACY, EXTERNAL R
SET
(24 kΩ) Assumes ideal resistor
Total Unadjusted Error (TUE)
3
−0.133 +0.133 % FSR
−0.133 ±0.0252 +0.133 % FSR T
A
= 25°C
Relative Accuracy (INL) −0.004 +0.004 % FSR
−0.004 ±0.0015 +0.004 % FSR T
A
= 25°C
Offset Error −0.029 +0.029 % FSR
−0.029
±0.0038
+0.029
% FSR
T
A
= 25°C
Offset Error TC 0.5 ppm FSR/°C
Gain Error −0.11 +0.11 % FSR
−0.106 ±0.0197 +0.106 % FSR T
A
= 25°C
Gain Error TC 2 ppm FSR/°C
Full-Scale Error −0.133 +0.133 % FSR
−0.133 ±0.0252 +0.133 % FSR T
A
= 25°C
Full-Scale Error TC 2 ppm FSR/°C
1
Temperature range: −40°C to +105°C; typical at +25°C.
2
Specifications guaranteed by design and characterization; not production tested.
3
Total unadjusted error is the total measured error (offset error + gain error + linearity error + output drift over temperature) after factory calibration of the AD5421.
System level total error can be reduced using the offset and gain registers.