AD7782 datasheet(2/12 Pages) AD

2 / 12 page

REV. 0

–2–

Parameter

AD7782B

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

µV typ

AIN(+) = AIN(–) = 2.5 V

Offset Error Drift vs. Temperature

±10

nV/

°C typ

Full-Scale Error

±10

µV typ

VDD = 3 V

Gain Drift vs. Temperature

±0.5

ppm/

°C typ

Power Supply Rejection (PSR)

100

dB typ

Input Range =

±160 mV, V

IN = 1/16 V

dB typ

Input Range =

±2.56 V, V

IN = 1 V

ANALOG INPUTS

Differential Input Voltage Ranges

±160

mV nom

RANGE = 0

±2.56

V nom

RANGE = 1

ADC Range Matching

±2

µV 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

±1

nA max

DC Input Current Drift

±5

pA /

°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, V

IN = 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

µA/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, V

IN = 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

LOGIC INPUTS

All Inputs Except SCLK and XTAL1

VINL, Input Low Voltage

0.8

V max

VDD = 5 V

0.4

V max

VDD = 3 V

VINH, Input High Voltage

2.0

V min

VDD = 3 V or 5 V

SCLK Only (Schmitt-Triggered Input)

VT(+)

1.4/2

V min/V max

VDD = 5 V

VT(–)

0.8/1.4

V min/V max

VDD = 5 V

VT(+) – VT(–)

0.3/0.85

V min/V max

VDD = 5 V

VT(+)

0.95/2

V min/V max

VDD = 3 V

VT(–)

0.4/1.1

V min/V max

VDD = 3 V

VT(+) – VT(–)

0.3/0.85

V min/V max

VDD = 3 V

(VDD = 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.)

FSR

REFIN

Gain

1 024

AD7782–SPECIFICATIONS

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