AD7791_15 datasheet(3/20 Pages) AD

Teilenummer	AD7791

Bauteilbeschribung	Low Power, Buffered 24-Bit Sigma-Delta ADC

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Hersteller	AD [Analog Devices]

Direct Link	http://www.analog.com

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Data Sheet

AD7791

Rev. A | Page 3 of 20

AD7791—SPECIFICATIONS1

Table 1. (VDD = 2.5 V to 5.25 V; REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; CDIV1 = CDIV0 = 0;

all specifications TMIN to TMAX, unless otherwise noted.)

Parameter

AD7791B

Unit

Test Conditions/Comments

ADC CHANNEL SPECIFICATION

Output Update Rate

9.5

Hz min nom

120

Hz max nom

ADC CHANNEL

No Missing Codes2

24

Bits min

Update Rate

≤ 20 Hz

Resolution

19.5

Bits p-p

9.5 Hz Update Rate

Output Noise

1.1

µV rms typ

Integral Nonlinearity

±15

ppm of FSR max

3.5 ppm typ

Offset Error

±3

µV typ

Offset Error Drift vs. Temperature

±10

nV/°C typ

Full-Scale Error3

±10

µV typ

Gain Drift vs. Temperature

±0.5

ppm/°C typ

Power Supply Rejection

90

dB min

100 dB typ, AIN = 1 V

ANALOG INPUTS

Differential Input Voltage Ranges

±REFIN

V nom

REFIN = REFIN(+) – REFIN(–);

Absolute AIN Voltage Limits2

GND + 100 mV

V min

Buffered Mode of Operation

VDD – 100 mV

V max

Analog Input Current

Buffered Mode of Operation

Average Input Current2

±1

nA max

Average Input Current Drift

±5

pA/°C typ

Absolute AIN Voltage Limits2

GND – 30 mV

V min

Unbuffered Mode of Operation

VDD + 30 mV

V max

Analog Input Current

Unbuffered Mode of Operation

Input current varies with input voltage.

Average Input Current

±400

nA/V typ

Average Input Current Drift

±50

pA/V/°C typ

Normal Mode Rejection2

@ 50 Hz, 60 Hz

65

dB min

73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004

@ 50 Hz

80

dB min

90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014

@ 60 Hz

80

dB min

90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114

Common Mode Rejection

AIN = 1 V

@DC

90

dB min

100 dB typ, FS[2:0] = 1004

@ 50 Hz, 60 Hz2

100

dB min

50 ± 1 Hz (FS[2:0] = 1014), 60 ± 1 Hz (FS[2:0] = 0114)

REFERENCE INPUT

REFIN Voltage

2.5

V nom

REFIN = REFIN(+) – REFIN(–)

Reference Voltage Range2

0.1

V min

V DD

V max

Absolute REFIN Voltage Limits2

GND – 30 mV

V min

VDD + 30 mV

V max

Average Reference Input Current

0.5

µA/V typ

Average Reference Input Current Drift

±0.03

nA/V/°C typ

1

Temperature Range –40°C to +105°C.

2

Specification is not production tested but is supported by characterization data at initial product release.

3

Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (VDD = 4 V).

4

FS[2:0] are the three bits used in the filter register to select the output word rate.

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