AD7949 datasheet(4/28 Pages) AD

Teilenummer	AD7949

Bauteilbeschribung	16-Bit, 8-Channel, 500 kSPS PulSAR ADC

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Hersteller	AD [Analog Devices]

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AD7699

Rev. 0 | Page 4 of 28

Parameter

Conditions/Comments

Min

Typ

Max

Unit

INTERNAL REFERENCE

REF Output Voltage

@ 25°C

4.086

4.096

4.106

V

REFIN Output Voltage6

@ 25°C

2.3

V

REF Output Current

±300

µA

Temperature Drift

±10

ppm/°C

Line Regulation

VDD = 5 V ± 5%

±15

ppm/V

Long-Term Drift

1000 hours

50

ppm

Turn-On Settling Time

CREF = 10 µF

5

ms

EXTERNAL REFERENCE

Voltage Range

REF input

0.5

VDD + 0.3

V

REFIN input (buffered)

0.5

VDD − 0.2

V

Current Drain

500 kSPS, REF = 5 V

100

µA

TEMPERATURE SENSOR

Output Voltage7

@ 25°C

283

mV

Temperature Sensitivity

1

mV/°C

DIGITAL INPUTS

Logic Levels

V

IL

−0.3

+0.3 × VIO

V

IH

0.7 × VIO

VIO + 0.3

V

I

IL

−1

+1

µA

I

IH

−1

+1

µA

DIGITAL OUTPUTS

Data Format8

Pipeline Delay9

V

OL

I

SINK = +500 µA

0.4

V

OH

I

SOURCE = −500 µA

VIO − 0.3

V

POWER SUPPLIES

VDD

Specified performance

4.5

5.5

V

VIO

Specified performance

1.8

VDD + 0.3

V

Standby Current10, 11

VDD and VIO = 5 V, @ 25°C

50

nA

Power Dissipation

VDD = 5 V, 100 kSPS throughput

5.2

µW

VDD = 5 V, 500 kSPS throughput

26

29

mW

VDD = 5 V, 500 kSPS throughput with internal reference

28

32

mW

Energy per Conversion

52

nJ

TEMPERATURE RANGE12

Specified Performance

T

MIN to TMAX

−40

+85

°C

1 See the Analog Inputs section.

2 The bandwidth is set with the configuration register.

3 LSB means least significant bit. With the 5 V input range, one LSB = 76.3 µV.

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

5 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.

6 This is the output from the internal band gap.

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

8 Unipolar mode: serial 16-bit straight binary.

Bipolar mode: serial 16-bit twos complement.

9 Conversion results available immediately after completed conversion.

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

11 During acquisition phase.

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

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