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AD7708BR Fiches technique(PDF) 3 Page - Analog Devices

No de pièce AD7708BR
Description  8-/10-Channel, Low Voltage, Low Power, ADCs
Download  44 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7708BR Fiches technique(HTML) 3 Page - Analog Devices

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REV. 0
–3–
AD7708/AD7718
Parameter
B Grade
Unit
Test Conditions
AD7718 (CHOP DISABLED)
Output Update Rate
16.06
Hz min
CHOP = 1
1.365
kHz max
No Missing Codes
2
24
Bits min
Resolution
13
Bits p-p
±20 mV Range, SF = 69
18
Bits p-p
±2.56 V Range, SF = 69
Output Noise and Update Rates
See Tables in
ADC Description
Integral Nonlinearity
±10
ppm of FSR max
2 ppm Typical
Offset Error
3
Table VII
µV typ
Offset Error is in the order of the noise for the
programmed gain and update rate following a
calibration
Offset Error Drift vs. Temp
4
±200
nV/
°C typ
Full-Scale Error
3
±10
µV typ
Gain Drift vs. Temp
4
±0.5
ppm/
°C typ
Negative Full-Scale Error
±0.003
% FSR max
ANALOG INPUTS
Differential Input Full-Scale Voltage
±1.024 × REFIN/GAIN V nom
REFIN Refers to Both REFIN1 and
REFIN2. REFIN = REFIN(+) –REFIN(–)
GAIN = 1 to 128
Absolute AIN Voltage Limits
AGND + 100 mV
V min
AIN1–AIN10 and AINCOM with
AVDD – 100 mV
V max
NEGBUF = 1
Absolute AINCOM Voltage Limits
AGND – 30 mV
V min
NEGBUF = 0
AVDD + 30 mV
V max
Analog Input Current
AIN1–AIN10 and AINCOM with NEGBUF = 1
DC Input Current
2
±1
nA max
DC Bias Current Drift
±5pA/°C typ
AINCOM Input Current
NEGBUF = 0
DC Input Current
2
±125
nA/V typ
±2.56 V Range
DC Bias Current Drift
±2
pA/V/
°C typ
Normal-Mode Rejection
2
@ 50 Hz
100
dB min
50 Hz
± 1 Hz, SF Word = 82
@ 60 Hz
100
dB min
60 Hz
± 1 Hz, SF Word = 68
Common-Mode Rejection
@ DC
90
dB min
100 dB typ, Analog Input = 1 V,
Input Range =
±2.56 V
110 dB typ on
±20 mV Range
@ 50 Hz
100
dB typ
50 Hz
± 1 Hz, SF Word = 82
@ 60 Hz
100
dB typ
60 Hz
± 1 Hz, SF Word = 68
REFERENCE INPUTS (REFIN1 AND REFIN2)
REFIN(+) to REFIN(–) Voltage
2.5
V nom
REFIN Refers to Both REFIN1 and REFIN2
REFIN(+) to REFIN(–) Range
2
1V min
AVDD
V max
REFIN Common-Mode Range
AGND – 30 mV
V min
AVDD + 30 mV
V max
Reference DC Input Current
0.5
µA/V typ
Reference DC Input Current Drift
±0.1
nA/V/
°C typ
Normal-Mode Rejection
2
@ 50 Hz
100
dB min
50 Hz
± 1 Hz, SF Word = 82
@ 60 Hz
100
dB min
60 Hz
± 1 Hz, SF Word = 68
Common-Mode Rejection
Input Range =
±2.56 V
@ DC
100
dB typ
Analog Input = 1 V. Input Range =
±2.56 V
@ 50 Hz
100
dB typ
@ 60 Hz
100
dB typ
AD7718 SPECIFICATIONS1 (AV
DD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, DVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V,
REFIN(+) = 2.5 V; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications TMIN to
TMAX unless otherwise noted.)


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