AD5421_11 AD [Analog Devices], AD5421_11 Datasheet - Page 15

• Manufacturer Part Number: AD5421_11
• Description: 16-Bit, Serial Input, Loop-Powered, 4 mA to 20 mA DAC
• Manufacturer: AD [Analog Devices]

–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
Figure 23. Loop Current Noise, 500 Hz to 10 kHz Bandwidth
6
5
4
3
2
1
0
6
5
4
3
2
1
0
–1.0
0
–40
0
V
EXT NMOS
INT V
Figure 25. Full-Scale Loop Current Step, C
LOOP
FALLING
FALLING
RISING
RISING
0.1
–0.5
–30
REF
= 24V
Figure 24. Full-Scale Loop Current Step
0.2
–20
0
I
R
T
LOOP
A
LOAD
0.3
= 25°C
(HART Bandwidth)
–10
= 4mA
0.5
= 500Ω
0.4
TIME (Seconds)
TIME (ms)
TIME (µs)
1.0
0.5
0
1.33mV p-p
0.2mV rms
0.6
1.5
10
V
EXT NMOS
R
T
C
LOOP
A
LOAD
IN
0.7
= 25°C
= OPEN CIRCUIT
2.0
20
IN
= 24V
V
EXT NMOS
R
T
C
= 250Ω
LOOP
A
0.8
LOAD
IN
= 22 nF
= 25°C
= 22nF
2.5
30
= 24V
= 250Ω
0.9
3.0
40
1.0
Rev. 0 | Page 15 of 32
Figure 26. IODV
Figure 27. IODV
Figure 28. IODV
0.244
0.242
0.240
0.238
0.236
0.234
0.232
0.230
0.228
0.226
0.60
0.55
0.50
0.45
0.40
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0
0
0
IODV
T
IODV
T
IODV
T
INCREASING
A
A
A
= 25°C
= 25°C
= 25°C
DECREASING
DD
DD
DD
0.5
= 3.3V
= 5V
1
= 1.8V
DD
DD
DD
Current vs. Digital Logic Voltage, Increasing and
Current vs. Digital Logic Voltage, Increasing and
Current vs. Digital Logic Voltage, Increasing and
0.5
Decreasing, IODV
Decreasing, IODV
Decreasing, IODV
1.0
DIGITAL LOGIC VOLTAGE (V)
DIGITAL LOGIC VOLTAGE (V)
DECREASING
DIGITAL LOGIC VOLTAGE (V)
2
DECREASING
1.5
1.0
3
DD
DD
2.0
DD
= 1.8 V
= 3.3 V
INCREASING
INCREASING
= 5 V
4
2.5
1.5
5
3.0
AD5421
3
2.0
.5
6