AD7730LBR datasheet(45/53 Pages) AD

45 / 53 page

–45–

AD7730/AD7730L

Parameter

B Version1

Units

Conditions/Comments

STATIC PERFORMANCE (CHP = 1)

No Missing Codes2

Bits min

Output Noise and Update Rates2

See Tables XXI & XXII

Integral Nonlinearity

ppm of FSR max

Offset Error2

See Note 3

Offset Error and Offset Drift Refer to Both

Offset Drift vs. Temperature2

nV/

°C typ

Unipolar Offset and Bipolar Zero Errors

Offset Drift vs. Time4

nV/1000 Hours typ

Positive Full-Scale Error2, 5

See Note 3

Positive Full-Scale Drift vs Temp2, 6, 7

ppm of FS/

°C max

Positive Full-Scale Drift vs Time4

ppm of FS/1000 Hours typ

Gain Error2, 8

See Note 3

Gain Drift vs. Temperature2, 6, 9

ppm/

°C max

Gain Drift vs. Time4

ppm/1000 Hours typ

Bipolar Negative Full-Scale Error2

See Note 3

Negative Full-Scale Drift vs. Temp2, 6

ppm of FS/

°C max

Power Supply Rejection

120

dB typ

Measured with Zero Differential Voltage

Common-Mode Rejection (CMR)

118

dB min

At DC. Measured with Zero Differential Voltage

Analog Input DC Bias Current2

nA max

Analog Input DC Bias Current Drift2

100

pA/

°C typ

Analog Input DC Offset Current2

nA max

Analog Input DC Offset Current Drift2

pA/

°C typ

STATIC PERFORMANCE (CHP = 0)2

No Missing Codes

Bits min

SKIP = 010

Output Noise and Update Rates

See Tables XXIII & XXIV

Integral Nonlinearity

ppm of FSR max

Offset Error

See Note 3

Offset Error and Offset Drift Refer to Both

Offset Drift vs. Temperature6

0.5

μV/°C typ

Unipolar Offset and Bipolar Zero Errors

Offset Drift vs. Time4

2.5

μV/1000 Hours typ

Positive Full-Scale Error5

See Note 3

Positive Full-Scale Drift vs. Temp6, 7

0.6

μV/°C typ

Positive Full-Scale Drift vs. Time4

μV/1000 Hours typ

Gain Error8

See Note 3

Gain Drift vs. Temperature6, 9

ppm/

°C typ

Gain Drift vs. Time4

ppm/1000 Hours typ

Bipolar Negative Full-Scale Error

See Note 3

Negative Full-Scale Drift vs. Temp

0.6

μV/°C typ

Power Supply Rejection

dB typ

Measured with Zero Differential Voltage

Common-Mode Rejection (CMR) on AIN 105

dB typ

At DC. Measured with Zero Differential Voltage

CMR on REF IN

100

dB typ

At DC. Measured with Zero Differential Voltage

Analog Input DC Bias Current

nA max

Analog Input DC Bias Current Drift

150

pA/

°C typ

Analog Input DC Offset Current

nA max

Analog Input DC Offset Current Drift

pA/

°C typ

ANALOG INPUTS/REFERENCE INPUTS

Normal-Mode 50 Hz Rejection2

dB min

From 49 Hz to 51 Hz

Normal-Mode 60 Hz Rejection2

dB min

From 59 Hz to 61 Hz

Common-Mode 50 Hz Rejection2

120

dB min

From 49 Hz to 51 Hz

Common-Mode 60 Hz Rejection2

120

dB min

From 59 Hz to 61 Hz

Analog Inputs

Differential Input Voltage Ranges11

Assuming 2.5 V or 5 V Reference with

HIREF Bit Set Appropriately

0 to +10 or

±10

mV nom

Gain = 250

0 to +20 or

±20

mV nom

Gain = 125

0 to +40 or

±40

mV nom

Gain = 62.5

0 to +80 or

±80

mV nom

Gain = 31.25

Absolute/Common-Mode Voltage12

AGND + 1.2 V

V min

AVDD – 0.95 V

V max

Reference Input

REF IN(+) – REF IN(–) Voltage

+2.5

V nom

HIREF Bit of Mode Register = 0

REF IN(+) – REF IN(–) Voltage

V nom

HIREF Bit of Mode Register = 1

Absolute/Common-Mode Voltage13

AGND – 30 mV

V min

AVDD + 30 mV

V max

NO REF Trigger Voltage

0.3

V min

NO REF Bit Active If VREF Below This Voltage

0.65

V max

NO REF Bit Inactive If VREF Above This Voltage

AD7730L–SPECIFICATIONS (AV

DD = +5 V, DVDD = +3 V or +5 V; REF IN(+) =

AVDD; REF IN(–) = AGND = DGND = 0 V; fCLK IN = 2.4576 MHz. All specifications TMIN to TMAX unless otherwise noted.)

REV. B

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