AD5421BCPZ-REEL7 datasheet(17/36 Pages) AD

No de pièce	AD5421BCPZ-REEL7

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

Download	36 Pages

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Fabricant	AD [Analog Devices]

Site Internet	http://www.analog.com

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17 / 36 page

Data Sheet

AD5421

Rev. F | Page 17 of 36

1.0

–1.0

–0.8

–0.6

–0.4

–0.2

0

0.2

0.6

0.8

0.4

0

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

TIME (Seconds)

VLOOP = 24V

EXT NMOS

INT VREF

ILOOP = 4mA

RLOAD = 500Ω

TA = 25°C

1.33mV p-p

0.2mV rms

Figure 24. Loop Current Noise, 500 Hz to 10 kHz Bandwidth

(HART Bandwidth)

6

5

4

3

2

1

0

–40

–30

–20

–10

0

10

20

30

40

TIME (µs)

FALLING

RISING

VLOOP = 24V

EXT NMOS

RLOAD = 250Ω

TA = 25°C

CIN = OPEN CIRCUIT

Figure 25. Full-Scale Loop Current Step

6

5

4

3

2

1

0

–1.0

–0.5

0

0.5

1.0

1.5

2.0

2.5

3.0

TIME (ms)

FALLING

RISING

VLOOP = 24V

EXT NMOS

RLOAD = 250Ω

TA = 25°C

CIN = 22nF

Figure 26. Full-Scale Loop Current Step, CIN = 22 nF

0.244

0.226

0.228

0.230

0.232

0.234

0.236

0.238

0.240

0.242

0

0.5

1.0

1.5

2.0

DIGITAL LOGIC VOLTAGE (V)

DECREASING

INCREASING

IODVDD = 1.8V

TA = 25°C

Figure 27. IODVDD Current vs. Digital Logic Voltage, Increasing and

Decreasing, IODVDD = 1.8 V

0.60

0.55

0.50

0.45

0.40

0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

DIGITAL LOGIC VOLTAGE (V)

IODVDD = 3.3V

TA = 25°C

DECREASING

INCREASING

Figure 28. IODVDD Current vs. Digital Logic Voltage, Increasing and

Decreasing, IODVDD = 3.3 V

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0

6

5

4

3

2

1

DIGITAL LOGIC VOLTAGE (V)

IODVDD = 5V

TA = 25°C

DECREASING

INCREASING

Figure 29. IODVDD Current vs. Digital Logic Voltage, Increasing and

Decreasing, IODVDD = 5 V

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