AD7783 datasheet(2/12 Pages) AD

2 / 12 page

REV. B

–2–

AD7783–SPECIFICATIONS1 (V

DD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V; REFIN(–) = GND;

GND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal; all specifications TMIN to TMAX, unless otherwise noted.)

Parameter

AD7783B

Unit

Test Conditions

ADC CHANNEL SPECIFICATION

Output Update Rate

19.79

Hz nom

ADC CHANNEL

No Missing Codes

Bits min

Resolution

Bits p-p

±160 mV Range, RANGE = 0

Bits p-p

±2.56 V Range, RANGE = 1

Output Noise

See Table I

Integral Nonlinearity

±10

ppm of FSR max

Typically 2 ppm,

Offset Error

±3

mV typ

AIN(+) = AIN(–) = 2.5 V

Offset Error Drift versus Temperature

±10

nV/

∞C typ

Full-Scale Error

±10

mV typ

VDD = 3 V

Gain Drift versus Temperature

±0.5

ppm/

∞C typ

Power Supply Rejection (PSR)

100

dB typ

Input Range =

±160 mV, VIN = 1/16 V

dB typ

Input Range =

±2.56 V, VIN = 1 V

ANALOG INPUTS

Differential Input Voltage Ranges

±160

mV nom

Range = 0

±2.56

V nom

Range = 1

ADC Range Matching

±2

mV typ

Input Voltage = 159 mV on Both Ranges

Absolute AIN Voltage Limits

GND + 100 mV

V min

VDD – 100 mV

V max

Analog Input Current

DC Input Current

±1nA max

DC Input Current Drift

±5pA/∞C typ

Normal-Mode Rejection

2, 3

@ 50 Hz

dB min

50 Hz

± 1 Hz

@ 60 Hz

dB min

60 Hz

± 1 Hz

Common-Mode Rejection

Input Range =

±160 mV, VIN = 1/16 V

@ DC

105

dB min

125 dB typ,

110 dB typ when Input Range =

±2.56 V

@ 50 Hz

100

dB min

50 Hz

± 1 Hz

@ 60 Hz

100

dB min

60 Hz

± 1 Hz

REFERENCE INPUT

REFIN Voltage

2.5

V nom

REFIN = REFIN(+) – REFIN(–)

REFIN Voltage Range

1V min

VDD

V max

Absolute REFIN Voltage Limits

GND – 30 mV

V min

VDD + 30 mV

V max

Average Reference Input Current

0.5

mA/V typ

Average Reference Input Current Drift

±0.01

nA/V/

∞C typ

Normal-Mode Rejection

2, 3

@ 50 Hz

dB min

50 Hz

± 1 Hz

@ 60 Hz

dB min

60 Hz

± 1 Hz

Common-Mode Rejection

Input Range =

±160 mV, VIN = 1/16 V

@ DC

100

dB typ

@ 50 Hz

110

dB typ

50 Hz

± 1 Hz

@ 60 Hz

110

dB typ

60 Hz

± 1 Hz

EXCITATION CURRENT SOURCES

(IEXC1, IEXC2)

Output Current

200

Initial Tolerance at 25

∞C

±10

% typ

Drift

200

ppm/

∞C typ

Initial Current Matching at 25

∞C

±2.5

% max

No Load

Drift Matching

ppm/

∞C typ

Line Regulation

2.5

mA/V max

VDD = 5 V

± 5%. Typically 1.25 mA/V.

Load Regulation

300

nA/V typ

Output Compliance

VDD – 0.6

V max

GND – 30 mV

V min

FSR

REFIN

Gain

= ¥

21 024

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