AD7794 datasheet(4/21 Pages) AD

Part #	AD7794

Description	Low Power, 24-Bit Sigma-Delta ADC with In-Amp and Embedded Reference (6 Channel)

PDF	21 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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4 / 21 page

AD7794

Preliminary Technical Data

REV.PrE 6/04 | Page 4

Parameter

AD7794B

Unit

Test Conditions/Comments

REFERENCE INPUT

Internal Reference Initial Accuracy

1.17 ±0.01%

V min/max

Internal Reference Drift

ppm/°C typ

ppm/°C max

Internal Reference Noise

µV RMS

Gain = 1, Update Rate = 16.6 Hz. Includes ADC

Noise.

External REFIN Voltage

2.5

V nom

REFIN = REFIN(+) – REFIN(–)

Reference Voltage Range2

0.1

V min

AVDD

V max

Absolute REFIN Voltage Limits2

GND – 30 mV

V min

AVDD + 30 mV

V max

Average Reference Input Current

400

nA/V typ

Average Reference Input Current Drift

±0.03

nA/V/°C typ

Normal Mode Rejection2

Same as for Analog

Inputs

Common Mode Rejection

Same as for Analog

Inputs

Reference Detect Levels

0.3

V min

NOXREF Bit Inactive if VREF < 0.3 V

0.65

V max

NOXREF Bit Active if VREF > 0.65 V

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