AD5421 Analog Devices, AD5421 Datasheet - Page 16

• 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

AD5421
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
6
5
4
3
2
1
0
Figure 24. Loop Current Noise, 500 Hz to 10 kHz Bandwidth
6
5
4
3
2
1
0
–1.0
–40
0
0
V
EXT NMOS
INT V
Figure 26. Full-Scale Loop Current Step, C
LOOP
FALLING
FALLING
RISING
RISING
0.1
–0.5
–30
REF
= 24V
Figure 25. 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
V
EXT NMOS
R
T
C
= 24V
IN
= 250Ω
0.8
LOOP
A
LOAD
IN
= 22 nF
= 25°C
= 22nF
2.5
30
= 24V
= 250Ω
0.9
3.0
40
1.0
Rev. C | Page 16 of 36
Figure 27. IODV
Figure 28. IODV
Figure 29. 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
INCREASING
IODV
T
A
A
A
= 25°C
= 25°C
= 25°C
DECREASING
DD
DD
DD
0.5
= 3.3V
= 5V
= 1.8V
DD
DD
1
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
2.0
DD
DD
DD
= 1.8 V
= 3.3 V
INCREASING
INCREASING
= 5 V
4
2.5
1.5
Data Sheet
5
3.0
3.5
2.0
6