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AD7949

Rev. B | Page 4 of 32

Parameter

Conditions/Comments

Min

Typ

Max

Unit

INTERNAL REFERENCE

REF Output Voltage

2.5 V, @ 25°C

2.490

2.500

2.510

4.096 V, @ 25°C

4.086

4.096

4.106

REFIN Output Voltage7

2.5 V, @ 25°C

1.2

4.096 V, @ 25°C

2.3

REF Output Current

±300

μA

Temperature Drift

±10

ppm/°C

Line Regulation

VDD = 5 V ± 5%

±15

ppm/V

Long-Term Drift

1000 hours

ppm

Turn-On Settling Time

CREF = 10 μF

EXTERNAL REFERENCE

Voltage Range

REF input

0.5

VDD + 0.3

REFIN input (buffered)

0.5

VDD − 0.5

Current Drain

250 kSPS, REF = 5 V

μA

TEMPERATURE SENSOR

Output Voltage8

@ 25°C

283

Temperature Sensitivity

mV/°C

DIGITAL INPUTS

Logic Levels

VIL

−0.3

+0.3 × VIO

VIH

0.7 × VIO

VIO + 0.3

IIL

−1

μA

IIH

−1

μA

DIGITAL OUTPUTS

Data Format9

Pipeline Delay10

VOL

ISINK = +500 μA

0.4

VOH

ISOURCE = −500 μA

VIO − 0.3

POWER SUPPLIES

VDD

Specified performance

2.3

5.5

VIO

Specified performance

2.3

VDD + 0.3

Operating range

1.8

VDD + 0.3

Standby Current11, 12

VDD and VIO = 5 V, @ 25°C

Power Dissipation

VDD = 2.5 V, 100 SPS throughput

1.5

μW

VDD = 2.5 V, 100 kSPS throughput

1.45

2.0

VDD = 2.5 V, 200 kSPS throughput

2.9

4.0

VDD = 5 V, 250 kSPS throughput

10.8

12.5

VDD = 5 V, 250 kSPS throughput with internal

reference

13.5

15.5

Energy per Conversion

TEMPERATURE RANGE13

Specified Performance

TMIN to TMAX

−40

+85

°C

1 See the Analog Inputs section.

2 The bandwidth is set in the configuration register.

3 LSB means least significant bit. With the 5 V input range, one LSB = 305 μV.

4 See the Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.

5 With VDD = 5 V, unless otherwise noted.

6 All specifications expressed in decibels are referred to a full-scale input FSR and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.

7 This is the output from the internal band gap.

8 The output voltage is internal and present on a dedicated multiplexer input.

9 Unipolar mode: serial 14-bit straight binary.

Bipolar mode: serial 14-bit twos complement.

10 Conversion results available immediately after completed conversion.

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

12 During acquisition phase.

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

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