AD7718BRU View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7718BRU

8-/10-Channel, Low Voltage, Low Power, Σ-∆ ADCs

Analog Devices 

Parameter

AD7708 (CHOP ENABLED)

Output Update Rate

No Missing Codes2

Resolution

Output Noise and Update Rates

Integral Nonlinearity

Offset Error3

Offset Error Drift vs. Temp4

Full-Scale Error3

Gain Drift vs. Temp4

ANALOG INPUTS

Differential Input Full-Scale Voltage

B Grade

Unit

5.4

105

16

13

16

See Tables in

ADC Description

± 15

±3

10

± 0.75

± 0.5

Hz min

Hz max

Bits min

Bits p-p

Bits p-p

ppm of FSR max

µV typ

nV/°C typ

LSB typ

ppm/°C typ

±1.024 × REFIN/GAIN V nom

Range Matching

Absolute AIN Voltage Limits

Absolute AINCOM Voltage Limits

Analog Input Current

DC Input Current2

DC Input Current Drift

AINCOM Input Current

DC Input Current2

DC Bias Current Drift

Normal-Mode Rejection2

@ 50 Hz

@ 60 Hz

Common-Mode Rejection

@ DC

±2

AGND + 100 mV

AVDD – 100 mV

AGND – 30 mV

AVDD + 30 mV

±1

±5

± 125

±2

100

94

90

µV typ

V min

V max

V min

V max

nA max

pA/°C typ

nA/V typ

pA/V/°C typ

dB min

dB min

dB min

@ 50 Hz2

@ 60 Hz2

REFERENCE INPUTS (REFIN1 AND REFIN2)

REFIN(+) to REFIN(–) Voltage

100

100

2.5 V

REFIN(+) to REFIN(–) Range2

REFIN Common-Mode Range

Reference DC Input Current2

Reference DC Input Current Drift

Normal-Mode Rejection2

@ 50 Hz

@ 60 Hz

Common-Mode Rejection

@ DC

@ 50 Hz

@ 60 Hz

LOGIC INPUTS5

All Inputs Except SCLK and XTAL12

VINL, Input Low Voltage

VINH, Input High Voltage

1

AVDD

AGND – 30 mV

AVDD + 30 mV

± 0.5

± 0.01

100

100

110

110

110

0.8

0.4

2.0

dB min

dB min

nom

V min

V max

V min

V max

µA/V typ

nA/V/°C typ

dB min

dB min

dB typ

dB typ

dB typ

V max

V max

V min

AD7708/AD7718

Test Conditions

CHOP = 1

0.732 ms Increments

20 Hz Update Rate

± 20 mV Range, 20 Hz Update Rate

± 2.56 V Range, 20 Hz Update Rate

2 ppm Typical

Calibration is Accurate to ± 0.5 LSB

Includes Positive and Negative ERRORS

REFIN Refers to Both REFIN1 and

REFIN2. REFIN = REFIN(+) REFIN(–)

GAIN = 1 to 128

Analog Input = 18 mV

AIN1–AIN10 and AINCOM with

NEGBUF = 1

NEGBUF = 0

AIN1–AIN10 and AINCOM with

NEGBUF = 1

NEGBUF = 0

50 Hz ± 1 Hz, SF Word = 82

60 Hz ± 1 Hz, SF Word = 68

100 dB typ, Analog Input = 1 V,

Input Range = ±2.56 V

110 dB typ on ± 20 mV Range

50 Hz ± 1 Hz, 20 Hz Update Rate

60 Hz ± 1 Hz, 20 Hz Update Rate

REFIN Refers to Both REFIN1 and

REFIN2

50 Hz ± 1 Hz, SF Word = 82

60 Hz ± 1 Hz, SF Word = 68

Input Range = ± 2.56 V

Analog Input = 1 V

50 Hz ± 1 Hz, 20 Hz Update Rate

60 Hz ± 1 Hz, 20 Hz Update Rate

DVDD = 5 V

DVDD = 3 V

DVDD = 3 V or 5 V

REV. 0

–7–

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