AD7791 데이터 시트보기 (PDF) - Analog Devices
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AD7791 Datasheet PDF : 20 Pages
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AD7791
AD7791—SPECIFICATIONS1
Table 1. (VDD = 2.5 V to 5.25 V; REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; CDIV1 = CDIV0 = 0;
all specifications TMIN to TMAX, unless otherwise noted.)
Parameter
AD7791B
Unit
Test Conditions/Comments
ADC CHANNEL SPECIFICATION
Output Update Rate
9.5
Hz min nom
120
Hz max nom
ADC CHANNEL
No Missing Codes2
24
Bits min
Update Rate ≤ 20 Hz
Resolution
19.5
Bits p-p
9.5 Hz Update Rate
Output Noise
1.1
µV rms typ
Integral Nonlinearity
±15
ppm of FSR max 3.5 ppm typ
Offset Error
±3
µV typ
Offset Error Drift vs. Temperature
±10
nV/°C typ
Full-Scale Error3
±10
µV typ
Gain Drift vs. Temperature
±0.5
ppm/°C typ
Power Supply Rejection
90
dB min
100 dB typ, AIN = 1 V
ANALOG INPUTS
Differential Input Voltage Ranges
±REFIN
V nom
REFIN = REFIN(+) – REFIN(–);
Absolute AIN Voltage Limits2
GND + 100 mV V min
Buffered Mode of Operation
VDD – 100 mV
V max
Analog Input Current
Buffered Mode of Operation
Average Input Current2
±1
nA max
Average Input Current Drift
±5
pA/°C typ
Absolute AIN Voltage Limits2
GND – 30 mV V min
Unbuffered Mode of Operation
VDD + 30 mV
V max
Analog Input Current
Unbuffered Mode of Operation
Input current varies with input voltage.
Average Input Current
±400
nA/V typ
Average Input Current Drift
±50
pA/V/°C typ
Normal Mode Rejection2
@ 50 Hz, 60 Hz
65
dB min
73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004
@ 50 Hz
80
dB min
90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014
@ 60 Hz
80
dB min
90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114
Common Mode Rejection
AIN = 1 V
@DC
90
dB min
100 dB typ, FS[2:0] = 1004
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz (FS[2:0] = 1014), 60 ± 1 Hz (FS[2:0] = 0114)
REFERENCE INPUT
REFIN Voltage
2.5
V nom
REFIN = REFIN(+) – REFIN(–)
Reference Voltage Range2
0.1
V min
Absolute REFIN Voltage Limits2
V DD
GND – 30 mV
V max
V min
VDD + 30 mV
V max
Average Reference Input Current
0.5
µA/V typ
Average Reference Input Current Drift
±0.03
nA/V/°C typ
1 Temperature Range –40°C to +105°C.
2 Specification is not production tested but is supported by characterization data at initial product release.
3 Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (VDD = 4 V).
4 FS[2:0] are the three bits used in the filter register to select the output word rate.
Rev. 0 | Page 3 of 20
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