AD7631BCPZ datasheet(4/32 Pages) AD

No. de pieza	AD7631BCPZ

Descripción Electrónicos	18-Bit, 250 kSPS, Differential Programmable Input PulSAR짰 ADC

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AD7631

Rev. A | Page 4 of 32

Parameter

Conditions/Comments

Min

Typ

Max

Unit

INTERNAL REFERENCE

PDREF = PDBUF = low

Output Voltage

REF @ 25°C

4.965

5.000

5.035

V

Temperature Drift

–40°C to +85°C

±3

ppm/°C

Line Regulation

AVDD = 5 V ± 5%

±15

ppm/V

Long-Term Drift

1000 hours

50

ppm

Turn-On Settling Time

CREF = 22 μF

10

ms

REFERENCE BUFFER

PDREF = high

REFBUFIN Input Voltage Range

2.4

2.5

2.6

V

EXTERNAL REFERENCE

PDREF = PDBUF = high

Voltage Range

REF

4.75

5

AVDD + 0.1

V

Current Drain

250 kSPS throughput

250

μA

TEMPERATURE PIN

Voltage Output

@ 25°C

311

mV

Temperature Sensitivity

1

mV/°C

Output Resistance

4.33

kΩ

DIGITAL INPUTS

Logic Levels

VIL

−0.3

+0.6

V

VIH

2.1

OVDD + 0.3

V

IIL

−1

+1

μA

IIH

−1

+1

μA

DIGITAL OUTPUTS

Data Format

Parallel or serial 18-bit

Pipeline Delay5

VOL

ISINK = 500 μA

0.4

V

VOH

ISOURCE = −500 μA

OVDD − 0.6

V

POWER SUPPLIES

Specified Performance

AVDD

4.756

5

5.25

V

DVDD

4.75

5

5.25

V

OVDD

2.7

5.25

V

VCC

7

15

15.75

V

VEE

−15.75

−15

0

V

Operating Current7

@ 250 kSPS throughput

AVDD

With Internal Reference8

8.5

mA

With Internal Reference Disabled8

6.1

mA

DVDD

4

mA

OVDD

0.1

mA

VCC

VCC = 15 V, with internal reference buffer

1.4

mA

VCC = 15 V

0.8

mA

VEE

VEE = −15 V

0.7

mA

Power Dissipation

@ 250 kSPS throughput

With Internal Reference8

94

120

mW

With Internal Reference Disabled8

73

100

mW

In Power-Down Mode9

PD = high

10

μW

TEMPERATURE RANGE10

Specified Performance

TMIN to TMAX

−40

+85

°C

1 In all input ranges, the input current scales with throughput. See the Analog Inputs section.

2 Linearity is tested using endpoints, not best fit. All linearity is tested with an external 5 V reference.

3 LSB means least significant bit. All specifications in LSB do not include the error contributed by the reference.

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

5 Conversion results are available immediately after completed conversion.

6 4.75 V or VREF − 0.1 V, whichever is larger.

7 Tested in parallel reading mode.

8 With internal reference, PDREF = PDBUF = low; with internal reference disabled, PDREF = PDBUF = high. With internal reference buffer, PDBUF = low.

9 With all digital inputs forced to OVDD.

10 Consult sales for extended temperature range.

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