AD5421 Analog Devices, AD5421 Datasheet - Page 15

• Manufacturer Part Number: AD5421
• Description: 16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC
• Manufacturer: Analog Devices

Specifications of AD5421

• Resolution (bits): 16bit
• Dac Settling Time: 50µs
• Max Pos Supply (v): +52V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: SPI

Data Sheet
–0.0005
–0.0010
–0.0015
–0.0020
–0.0025
–0.0005
0.0015
0.0010
0.0005
0.0030
0.0025
0.0020
0.0015
0.0010
0.0005
Figure 20. Load Resistance Load Line vs. Loop Supply Voltage
2000
1750
1500
1250
1000
750
500
250
0
0
0
0
0
0
Figure 19. Full-Scale Error vs. Loop Supply Voltage
R
T
3.8mA TO 21mA RANGE
EXT V
EXT R
T
EXT V
I
EXT R
LOOP
A
LOAD
A
Figure 18. Gain Error vs. Loop Supply Voltage
= 25°C
= 25°C
REF
SET
REF
= 24mA
SET
(Voltage Between LOOP− and REG
= 250Ω
10
10
10
LOOP SUPPLY VOLTAGE (V)
LOOP SUPPLY VOLTAGE (V)
LOOP SUPPLY VOLTAGE (V)
20
20
20
30
30
OPERATING AREA
30
R
T
3.8mA TO 21mA RANGE
EXT V
EXT R
A
LOAD
= 25°C
40
40
REF
SET
= 250Ω
IN
40
)
50
50
50
60
60
Rev. C | Page 15 of 36
4.70
4.65
4.60
4.55
4.50
4.45
4.40
4.35
–2
–4
–6
–8
7
6
5
4
3
2
1
0
8
6
4
2
0
Figure 21. Compliance Voltage Headroom vs. Temperature
0
Figure 23. Loop Current Noise, 0.1 Hz to 10 Hz Bandwidth
–40
0
V
EXT NMOS
R
T
I
Figure 22. Loop Current Error vs. REG
LOOP
LOOP
A
LOAD
= 25°C
0.5
1
= 20mA
= 24V
= 250Ω
–20
1.0
2
REG
1.5
0
3
OUT
TEMPERATURE (°C)
2.0
TIME (Seconds)
LOAD CURRENT (mA)
4
20
2.5
5
40
3.0
6
R
3.2mA TO 24mA RANGE
EXT V
I
LOOP
LOAD
OUT
3.5
V
EXT NMOS
EXT V
I
R
T
60
7
LOOP
A
LOOP
LOAD
REF
= 24mA
Load Current
= 250Ω
= 25°C
4.0
REF
= 4mA
8
= 24V
= 250Ω
80
4.5
9
AD5421
100
5.0
10