AD421 datasheet(2/14 Pages) AD

2 / 14 page

DAC SPECIFICATIONS

Parameter

B Versions

Units

Conditions/Comments

ACCURACY

Resolution

Bits

Monotonicity

Bits min

Integral Nonlinearity

±0.01

% of FS max

FS = Full-Scale Output Current

Offset (4 mA) @ +25

°C4

±0.1

% of FS max

VCC = 5 V

Offset Drift

±25

ppm of FS/

°C max Includes On-Chip Reference Drift

Total Output Error (20 mA) @ +25

°C4

±0.2

% of FS max

VCC = 5 V

Total Output Drift

±50

ppm of FS/

°C max Includes On-Chip Reference Drift

VCC Supply Sensitivity

nA/mV max

25 nA/mV Typical

VOLTAGE REFERENCE

REF OUT2

Output Voltage

2.49/2.51

V min/V max

2.5 V Nominal

Drift

±40

ppm/

°C max

20 ppm/

°C Typical from –40°C to +25°C and

–2.5 ppm/

°C Typical from +25°C to +85°C

Externally Available Current

0.5

mA min

VCC Supply Sensitivity

150

µV/V max

µV/V Typical

Output Impedance

Ω typ

Noise (0.1 Hz–10 Hz)

µV (p-p) typ

REF OUT1

Output Voltage

1.24/1.26

V min/V max

1.25 V Nominal, 100 k

Ω Load to COM5

Drift

±50

ppm/

°C max

20 ppm/

°C Typical from –40°C to +25°C and

2 ppm/

°C Typical from +25°C to +85°C

Externally Available Current

0.5

mA min

VCC Supply Sensitivity

150

µV/V max

µV/V Typical

Output Impedance

Ω typ

Noise (0.1 Hz–10 Hz)

µV (p-p) typ

REF IN

Input Resistance

Ω typ

DIGITAL INPUTS

VIH (Logic 1)

0.75

× V

V min

VIL (Logic 0)

0.25

× V

V max

IIH

±10

µA max

VIN = VCC

IIL

±10

µA max

VIN = 0 V

Data Coding

Binary

Data Rate

Mbps max

POWER SUPPLIES

Operating Range

+2.95 to +5.05

V min to V max

Functional to 7 V

Quiescent Current

@ VCC = 3 V

650

µA max

475

µA Typical

@ VCC = 5 V

750

µA max

575

µA Typical

NOTES

1The DN25D is available from Supertex, Inc., 1350 Bordeaux Drive, Sunnyvale, CA 94089.

2Temperature range is –40

°C to +85°C.

3The max current loop voltage compliance is determined by the pass transistor breakdown voltage and is 350 V for the DN25D.

4With V

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

Ω 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.

5100 k

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

Specifications subject to change without notice.

AD421–LOOP-POWERED SPECIFICATIONS

Parameter

B Versions

Units

Conditions/Comments

OUTPUT CHARACTERISTICS

Current Loop Voltage Compliance

VCC + 2

V min

350

V max

DN25D Breakdown Voltage

Full-Scale Settling Time

ms typ

Settling Time to

±0.1%, C1 = C2 = 10 nF, C3 = 3.3 nF

Output Impedance

Ω typ

AC Loop Voltage Sensitivity

µA/V typ

1200 Hz to 2200 Hz

VOLTAGE REGULATOR

Output Voltage (VCC)

3 V Mode

2.95/3.05

V min/V max

3 V Nominal. LV Pin Connected to VCC

3.3 V Mode

3.25/3.35

V min/V max

3.3 V Nominal. LV Pin Connected Through 0.01

µF to V

5 V Mode

4.95/5.05

V min/V max

5 V Nominal. LV Pin Connected to COM

Externally Available Current

3.25

mA min

Assuming 4 mA Flowing in the Loop

Line Regulation

µV/V typ

Load Regulation

µV/mA typ

–2–

(Using DN25D

1 as pass transistor as per Figure 3;

REF IN = REF OUT2; TA = TMIN to TMAX unless otherwise noted)

REV. C

(VCC = +3 V to +5 V; REF IN = REF OUT2; TA = TMIN to TMAX unless otherwise noted)

AD421 数据表(PDF) 2 Page - Analog Devices

AD421 数据表(HTML) 2 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

数据表下载

链接网址

AD421 数据表(PDF) 2 Page - Analog Devices

AD421 数据表(HTML) 2 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

数据表 下载

链接网址

数据表下载