AD7643BSTZ datasheet(5/29 Pages) AD

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AD7643

Rev. 0 | Page 4 of 28

Parameter

Conditions

Min

Typ

Max

Unit

Turn-On Settling Time

CREF = 10 μF

REFBUFIN Output Voltage

REFBUFIN @ 25°C

1.19

REFBUFIN Output Resistance

6.33

kΩ

EXTERNAL REFERENCE

PDREF = PDBUF = high

Voltage Range

REF

1.8

2.5

AVDD + 0.1

Current Drain

1.25 MSPS throughput

100

μA

REFERENCE BUFFER

PDREF = high, PDBUF = low

REFBUFIN Input Voltage Range

REF = 2.048 V typical

1.05

1.2

1.30

REFBUFIN Input Current

REFBUFIN = 1.2 V

TEMPERATURE PIN

Voltage Output

@ 25°C

278

Temperature Sensitivity

mV/°C

Output Resistance

4.7

kΩ

DIGITAL INPUTS

Logic Levels

VIL

−0.3

+0.6

VIH

1.7

5.25

IIL

−1

μA

IIH

−1

μA

DIGITAL OUTPUTS

Data Format7

Pipeline Delay8

VOL

ISINK = 500 μA

0.4

VOH

ISOURCE = −500 μA

OVDD − 0.3

POWER SUPPLIES

Specified Performance

AVDD

2.37

2.5

2.63

DVDD

2.37

2.5

2.63

OVDD

2.309

3.6

Operating Current10

1.25 MSPS throughput

AVDD11

With internal reference

DVDD

1.5

OVDD12

0.5

Power Dissipation10, 11

With Internal Reference

1.25 MSPS throughput

With External Reference

1.25 MSPS throughput

In Power-Down Mode12

PD = high

μW

TEMPERATURE RANGE13

Specified Performance

TMIN to TMAX

−40

+85

°C

1 When using an external reference. With the internal reference, the input range is −0.1 V to VREF.

2 See Analog Inputs section.

3 Linearity is tested using endpoints, not best fit.

4 LSB means least significant bit. With the ±2.048 V input range, 1 LSB is 15.63 μV.

5 See Voltage Reference Input section. These specifications do not include the error contribution from the external reference.

6 All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.

7 Parallel or serial 18-bit.

8 Conversion results are available immediately after completed conversion.

9 See the Absolute Maximum Ratings section.

10 Tested in parallel reading mode.

11 With internal reference, PDREF and PDBUF are low; with external reference, PDREF and PDBUF are high.

12 With all digital inputs forced to OVDD.

13 Consult sales for extended temperature range.

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