AD7985 datasheet(4/28 Pages) AD

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AD7985

Rev. 0 | Page 4 of 28

Table 3.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

INTERNAL REFERENCE

PDREF is low

Output Voltage

TA = 25°C

4.081

4.096

4.111

Temperature Drift

−40°C to +85°C

±10

ppm/°C

Line Regulation

AVDD = 2.5 V ± 5%

±50

ppm/V

Turn-On Settling Time

CREF = 10 μF, CREFIN = 0.1 μF

REFIN Output Voltage

REFIN at 25°C

1.2

REFIN Output Resistance

kΩ

EXTERNAL REFERENCE

PDREF is high, REFIN is low

Voltage Range

2.4

5.1

Current Drain

500

μA

REFERENCE BUFFER

REFIN Input Voltage Range

1.2

REFIN Input Current

160

μA

DIGITAL INPUTS

Logic Levels

VIL

−0.3

0.1 × VIO

VIH

0.9 × VIO

VIO + 0.3

IIL

−1

μA

IIH

−1

μA

DIGITAL OUTPUTS

Data Format

Serial 16 bits, straight binary

Pipeline Delay

Conversion results available immediately

after completed conversion

VOL

ISINK = +500 μA

0.4

VOH

ISOURCE = −500 μA

VIO − 0.3

POWER SUPPLIES

AVDD, DVDD

2.375

2.5

2.625

BVDD

4.75

5.0

5.25

VIO

Specified performance

1.8

2.5

2.7

Standby Current1, 2

AVDD = DVDD = VIO = 2.5 V

1.0

μA

Power Dissipation

With Internal Reference

2.5 MSPS throughput

2.0 MSPS throughput

With External Reference

2.5 MSPS throughput

15.5

2.0 MSPS throughput

TEMPERATURE RANGE3

Specified Performance

TMIN to TMAX

−40

+85

°C

1 With all digital inputs forced to VIO or GND as required.

2 During acquisition phase.

3 Contact an Analog Devices, Inc., sales representative for the extended temperature range.

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