Datasheet
Data Sheet AD5421
Rev. G | Page 5 of 36
Parameter
1
Min Typ Max Unit Test Conditions/Comments
Gain Error TC
3
1 ppm FSR/°C
Full-Scale Error −0.047 +0.047 % FSR
−0.028 ±0.0017 +0.028 % FSR T
A
= 25°C
Full-Scale Error TC
3
1 ppm FSR/°C
Downscale Alarm Current
3.08
3.21
mA
Upscale Alarm Current 22.78 23 mA
4 mA to 20 mA and 3.8 mA to 21 mA
ranges
23.99 24.01 mA 3.2 mA to 24 mA range
OUTPUT CHARACTERISTICS
3
Loop Compliance Voltage
4
LOOP− + 5.5 V REG
OUT
< 5.5 V, loop current = 24 mA
LOOP− + 12.5 V REG
OUT
= 12 V, loop current = 24 mA
Loop Current Long-Term Stability 100 ppm FSR
Drift after 1000 hours at T
A
= 125°C,
loop current = 12 mA, internal R
SET
15
ppm FSR
Drift after 1000 hours at T
A
= 125°C,
loop current = 12 mA, external R
SET
Loop Current Error vs. REG
OUT
Load
Current
1.2 µA/mA
Loop current = 12 mA, load current
from REG
OUT
= 5 mA
Resistive Load 0 2 kΩ See Figure 21 for a load line graph
Inductive Load
50
mH
Stable operation
Power Supply Sensitivity 0.1 µA/V Loop current = 12 mA
Output Impedance 12 400 MΩ
Output TC 3 ppm FSR/°C Loop current = 12 mA, internal R
SET
1 ppm FSR/°C Loop current = 12 mA, external R
SET
Output Noise
0.1 Hz to 10 Hz
50
nA p-p
500 Hz to 10 kHz 0.2 mV rms
HART bandwidth; measured across
500 Ω load
Noise Spectral Density 195 nA/√Hz At 1 kHz
256 nA/√Hz At 10 kHz
REFERENCE INPUT (REFIN PIN)
3
Reference Input Voltage
5
2.5 V For specified performance
DC Input Impedance 75 800 MΩ
REFERENCE OUTPUTS
REFOUT1 Pin
Output Voltage 2.498 2.5 2.503 V T
A
= 25°C
Temperature Coefficient
1.5
4
ppm/°C
C grade
2 8 ppm/°C B grade
4 10 ppm/°C A grade
Output Noise (0.1 Hz to 10 Hz)
3
7.5 µV p-p
Noise Spectral Density
3
245 nV/√Hz At 1 kHz
70 nV/√Hz At 10 kHz
Output Voltage Drift vs. Time
3
200
ppm
Drift after 1000 hours at T
A
= 125°C
Capacitive Load
3
10 nF Recommended operation
Load Current
3, 6
4 mA
Short-Circuit Current
3
6.5 mA Short circuit to COM
Power Supply Sensitivity
3
2 12 µV/V
Thermal Hysteresis
3
285 ppm First temperature cycle
5 ppm Second temperature cycle
Load Regulation
3
0.1 0.2 mV/mA Measured at 0 mA and 1 mA loads
Output Impedance 0.1 Ω
REFOUT2 Pin
Output Voltage 1.18 1.227 1.28 V T
A
= 25°C
Output Impedance
72
kΩ