AD5421_11 datasheet(4/32 Pages) AD

Part #	AD5421

Description	16-Bit, Serial Input, Loop-Powered, 4 mA to 20 mA DAC

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Manufacturer	AD [Analog Devices]

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AD5421

Rev. 0 | Page 4 of 32

Parameter1

Min

Typ

Max

Unit

Test Conditions/Comments

OUTPUT CHARACTERISTICS3

Loop Compliance Voltage4

LOOP− + 5.5

V

REGOUT < 5.5 V, loop current = 24 mA

LOOP− + 12.5

V

REGOUT = 12 V, loop current = 24 mA

Loop Current Long-Term Stability

100

ppm FSR

Drift after 1000 hours at TA = 125°C,

loop current = 12 mA, internal RSET

15

ppm FSR

Drift after 1000 hours at TA = 125°C,

loop current = 12 mA, external RSET

Loop Current Error vs. REGOUT Load

Current

1.2

μA/mA

Loop current = 12 mA, load current

from REGOUT = 5 mA

Resistive Load

0

2

kΩ

See Figure 19 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 RSET

1

ppm FSR/°C

Loop current = 12 mA, external RSET

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 Voltage5

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

TA = 25°C

Temperature Coefficient

1.5

4

ppm/°C

C grade

2

10

ppm/°C

B grade

Output Noise (0.1 Hz to 10 Hz)3

7.5

μV p-p

Noise Spectral Density3

245

nV/√Hz

At 1 kHz

70

nV/√Hz

At 10 kHz

Output Voltage Drift vs. Time3

200

ppm

Drift after 1000 hours at TA = 125°C

Capacitive Load3

10

nF

Stable operation

Load Current3, 6

4

mA

Short-Circuit Current3

6.5

mA

Short circuit to COM

Power Supply Sensitivity3

2

12

μV/V

Thermal Hysteresis3

285

ppm

First temperature cycle

5

ppm

Second temperature cycle

Load Regulation3

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

TA = 25°C

Output Impedance

72

kΩ

REGOUT OUTPUT

Voltage regulator output

Output Voltage

1.8

12

V

See Table 10

Output Voltage TC3

110

ppm/°C

Output Voltage Accuracy

−4

±2

+4

%

Externally Available Current3, 6

3.15

mA

Assuming 4 mA flowing in the loop

and during HART communications

Short-Circuit Current

23

mA

Line Regulation3

500

mV/V

Internal NMOS

10

mV/V

External NMOS

Load Regulation3

8

mV/mA

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