EVAL-AD7799EBZ datasheet(4/28 Pages) AD

Part #	EVAL-AD7799EBZ

Description	3-Channel, Low Noise, Low Power, 16-/24-Bit, ADC with On-Chip In-Amp

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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4 / 28 page

AD7798/AD7799

Data Sheet

Rev. B | Page 4 of 28

Parameter

AD7798B/AD7799B1

Unit

Test Conditions/Comments

REFERENCE

External REFIN Voltage

2.5

V nom

REFIN = REFIN(+) − REFIN(−)

Reference Voltage Range2

0.1

V min

AVDD

V max

When VREF = AVDD, the differential input must be

limited to (0.9 x VREF/gain) if the in-amp is active.

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 Rejection

Same as for analog

inputs

Common-Mode Rejection

100

dB typ

Reference Detect Levels

0.3

V min

0.65

V max

NOXREF bit active if VREF < 0.3 V

LOW-SIDE POWER SWITCH

RON

7

Ω max

AVDD = 5 V

9

Ω max

AVDD = 3 V

Allowable Current2

30

mA max

Continuous current

DIGITAL OUTPUTS (P1 and P2)

Output High Voltage, VOH2

AVDD − 0.6

V min

AVDD = 3 V, ISOURCE = 100 µA

Output Low Voltage, VOL2

0.4

V max

AVDD = 3 V, ISINK = 100 µA

Output High Voltage, VOH2

4

V min

AVDD = 5 V, ISOURCE = 200 µA

Output Low Voltage, VOL2

0.4

V max

AVDD = 5 V, ISINK = 800 µA

INTERNAL CLOCK

Frequency2

64 ± 3%

kHz min/max

LOGIC INPUTS

CS2

Input Low Voltage, VINL

0.8

V max

DVDD = 5 V

Input High Voltage, VINH

0.4

2.0

V max

V min

DVDD = 3 V

DVDD = 3 V or 5 V

SCLK and DIN

(Schmitt-Triggered Input)2

VT(+)

1.4/2

V min/max

DVDD = 5 V

VT(–)

0.8/1.7

V min/max

DVDD = 5 V

VT(+) – VT(–)

0.1/0.17

V min/max

DVDD = 5 V

VT(+)

0.9/2

V min/max

DVDD = 3 V

VT(–)

0.4/1.35

V min/max

DVDD = 3 V

VT(+) − VT(–)

0.06/0.13

V min/max

DVDD = 3 V

Input Currents

±10

µA max

VIN = DVDD or GND

Input Capacitance

10

pF typ

All digital inputs

LOGIC OUTPUTS

Output High Voltage, VOH2

DVDD − 0.6

V min

DVDD = 3 V, ISOURCE = 100 µA

Output Low Voltage, VOL2

0.4

V max

DVDD = 3 V, ISINK = 100 µA

Output High Voltage, VOH2

4

V min

DVDD = 5 V, ISOURCE = 200 µA

Output Low Voltage, VOL2

0.4

V max

DVDD = 5 V, ISINK = 1.6 mA

Floating-State Leakage Current

±10

µA max

Floating-State Output Capacitance

10

pF typ

Data Output Coding

Offset binary

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