AD7792 datasheet(4/18 Pages) AD

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AD7792/AD7793

Preliminary Technical Data

REV.PrF 6/04 | Page 4

Parameter

AD7792/AD7793B

Unit

Test Conditions/Comments

@ 50 Hz, 60 Hz2

100

dB min

50 ± 1 Hz (FS[3:0] = 10016), 60 ± 1 Hz (FS[3:0] =

10006)

REFERENCE

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 DD

V min

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

EXCITATION CURRENT SOURCES

(IEXC1 and IEXC2)

Output Current

10/200/1000

µA nom

Initial Tolerance at 25°C

±5

% typ

Drift

200

ppm/°C typ

Initial Current Matching at 25°C

±1

% typ

Matching between IEXC1 and EXC2. VOUT = 0 V

Drift Matching

ppm/°C typ

Line Regulation (VDD)

2.1

ppm/V max

AVDD = 5 V ± 5%. Typically 1.25 ppm/V

Load Regulation

0.3

ppm/V typ

Output Compliance

AVDD – 0.6

V max

10 µA or 200 µA Currents Selected

AVDD – 1

V max

1 mA Currents Selected

GND – 30 mV

V min

TEMP SENSOR

Accuracy

TBD

°C typ

BIAS VOLTAGE GENERATOR

VBIAS

AVDD/2

V nom

VBIAS Generator Start-Up Time

TBD

ms/nF typ

Dependent on the Capacitance on the AIN pin

INTERNAL/EXTERNAL CLOCK

Internal Clock

Frequency

64 ±2%

KHz nom

Duty Cycle

50:50

% typ

Drift

0.01

%/°C typ

External Clock

Frequency

KHz nom

Duty Cycle

45:55

% typ

LOGIC INPUTS

All Inputs Except SCLK, DIN and CLK2

VINL, Input Low Voltage

0.8

V max

DVDD = 5 V

0.4

V max

DVDD = 3 V

VINH, Input High Voltage

2.0

V min

DVDD = 3 V or 5 V

SCLK and DIN (Schmitt-Triggered Input)2

VT(+)

1.4/2

V min/V max

DVDD = 5 V

VT(–)

0.8/1.4

V min/V max

DVDD = 5 V

VT(+) – VT(–)

0.3/0.85

V min/V max

DVDD = 5 V

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