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AD7797 데이터시트(PDF) 3 Page - Analog Devices

부품명 AD7797
상세설명  Low Power, 16-/24-Bit Sigma-Delta ADC
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD7797 데이터시트(HTML) 3 Page - Analog Devices

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AD7796/AD7797
Rev. A | Page 3 of 24
SPECIFICATIONS
AVDD = 2.7 V to 5.25 V, DVDD = 2.7 V to 5.25 V, GND = 0 V, all specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
AD7796B/AD7797B1
Unit
Test Conditions/Comments
ADC CHANNEL
Output Update Rate
4.17 to 123
Hz nom
No Missing Codes2
24
Bits min
AD7797 only
16
Bits min
AD7796 only
Resolution
See Table 7 and Table 8
RMS Noise and Update Rates
See Table 6
Integral Nonlinearity
±10
ppm of FSR typ
Offset Error3, 4
±1
μV typ
Offset Error Drift vs. Temperature4
±10
nV/°C typ
Full-Scale Error3, 4, 5
±10
μV typ
Gain Drift vs. Temperature4
±3
ppm/°C typ
Power Supply Rejection
90
dB min
AIN = 1 V/128
ANALOG INPUTS
Differential Input Voltage Ranges
±VREF/128
V nom
VREF = REFIN(+) – REFIN(–)
Absolute AIN Voltage Limits2
GND + 300 mV
V min
AVDD − 1.1
V max
Common-Mode Voltage, VCM
0.5
V min
VCM = (AIN(+) + AIN(–))/2
Analog Input Current
Average Input Current2
±250
pA max
Update rate < 100 Hz
Average Input Current Drift
±2
pA/°C typ
Normal Mode Rejection2
Internal Clock
@ 50 Hz, 60 Hz
65
dB min
80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz
80
dB min
90 dB typ, 50 ± 1 Hz, FS[3:0] = 10016
@ 60 Hz
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006
External Clock
@ 50 Hz, 60 Hz
80
dB min
90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz
94
dB min
100 dB typ, 50 ± 1 Hz, FS[3:0] = 10016
@ 60 Hz
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006
Common-Mode Rejection
@ DC
90
dB min
AIN = 7.81 mV
@ 50 Hz, 60 Hz2
90
dB min
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz, 60 Hz2
90
dB min
50 ± 1 Hz (FS[3:0] = 10016), 60 ± 1 Hz,
FS[3:0] = 10006
REFERENCE
External REFIN Voltage
2.5
V nom
REFIN = REFIN(+) – REFIN(–)
Reference Voltage Range2
0.1
V min
AVDD
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 Rejection
Same as for analog inputs
Common-Mode Rejection
100
dB typ
TEMPERATURE SENSOR
Accuracy
±2
°C typ
Applies if user calibrates the temperature sensor
Sensitivity
0.81
mV/°C typ


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