EVAL-AD421EB【PDF 2/14 页】Loop-Powered 4 mA to 20 mA DAC

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DAC SPECIFICATIONS

Parameter

B Versions

Units

Conditions/Comments

ACCURACY

Resolution

Monotonicity

Integral Nonlinearity

Offset (4 mA) @ +25

Offset Drift

Total Output Error (20 mA) @ +25

Total Output Drift

Supply Sensitivity

VOLTAGE REFERENCE

REF OUT2

Output Voltage

Drift

0.01

0.1

0.2

Bits

Bits min

% of FS max

ppm of FS/

C max

% of FS max

ppm of FS/

C max

nA/mV max

FS = Full-Scale Output Current

= 5 V

Includes On-Chip Reference Drift

= 5 V

Includes On-Chip Reference Drift

25 nA/mV Typical

2.49/2.51

V min/V max

ppm/

C max

2.5 V Nominal

20 ppm/

C Typical from –40

C to +25

C and

–2.5 ppm/

C Typical from +25

C to +85

Externally Available Current

Supply Sensitivity

Output Impedance

Noise (0.1 Hz–10 Hz)

REF OUT1

Output Voltage

Drift

0.5

150

mA min

V/V max

typ

V (p-p) typ

V/V Typical

1.24/1.26

V min/V max

ppm/

C max

1.25 V Nominal, 100 k

Load to COM

20 ppm/

C Typical from –40

C to +25

C and

2 ppm/

C Typical from +25

C to +85

Externally Available Current

Supply Sensitivity

Output Impedance

Noise (0.1 Hz–10 Hz)

REF IN

Input Resistance

DIGITAL INPUTS

(Logic 1)

(Logic 0)

Data Coding

Data Rate

POWER SUPPLIES

Operating Range

Quiescent Current

@ V

= 3 V

@ V

= 5 V

NOTES

The DN25D is available from Supertex, Inc., 1350 Bordeaux Drive, Sunnyvale, CA 94089.

Temperature range is –40

C to +85

The max current loop voltage compliance is determined by the pass transistor breakdown voltage and is 350 V for the DN25D.

With V

= 3 V, the transfer function shifts negative by typically 0.25%; a 16 k

resistor connected between COM and LOOPRTN will approximately compensate for the V

supply sensitivity in moving from 5 V to 3 V by skewing the gain of the AD421.

100 k

resistor only required if this reference is being used in application circuits.

Specifications subject to change without notice.

0.5

150

mA min

V/V max

typ

V (p-p) typ

V/V Typical

typ

0.75

0.25

Binary

V min

V max

A max

= V

= 0 V

Mbps max

+2.95 to +5.05

V min to V max

Functional to 7 V

650

750

A max

475

A Typical

575

A Typical

AD421–LOOP-POWERED SPECIFICATIONS

Parameter

OUTPUT CHARACTERISTICS

Current Loop Voltage Compliance

B Versions

Units

Conditions/Comments

+ 2

350

V min

V max

ms typ

typ

A/V typ

DN25D Breakdown Voltage

Settling Time to

0.1%, C1 = C2 = 10 nF, C3 = 3.3 nF

Full-Scale Settling Time

Output Impedance

AC Loop Voltage Sensitivity

VOLTAGE REGULATOR

Output Voltage (V

)

3 V Mode

3.3 V Mode

5 V Mode

Externally Available Current

Line Regulation

Load Regulation

1200 Hz to 2200 Hz

2.95/3.05

3.25/3.35

4.95/5.05

3.25

V min/V max

mA min

V/V typ

V/mA typ

3 V Nominal. LV Pin Connected to V

3.3 V Nominal. LV Pin Connected Through 0.01

F to V

5 V Nominal. LV Pin Connected to COM

Assuming 4 mA Flowing in the Loop

–2–

(Using DN25D

as pass transistor as per Figure 3;

REF IN = REF OUT2; T

= T

MIN

to T

MAX

unless otherwise noted)

REV. C

= +3V to +5V; REF IN = REF OUT2; T

= T

MIN

to T

MAX

unless otherwise noted)

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