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AD7785 데이터시트(HTML) 3 Page - Analog Devices

부품명 AD7785
상세내용  3-Channel, Low Noise, Low Power, 20-Bit ∑-Δ ADC with On-Chip In-Amp and Reference
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제조사  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD7785 데이터시트(HTML) 3 Page - Analog Devices

 
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AD7785
Rev. 0 | Page 3 of 32
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
AD7785B1
Unit
Test Conditions/Comments
ADC CHANNEL
Output Update Rate
4.17 to 470
Hz nom
No Missing Codes2
20
Bits min
Resolution
See Output Noise and Resolution Specifications
Output Noise and Update Rates
See Output Noise and Resolution Specifications
Integral Nonlinearity
±15
ppm of FSR max
Offset Error3
±1
μV typ
Offset Error Drift vs. Temperature4
±10
nV/°C typ
Full-Scale Error3, 5
±10
μV typ
Gain Drift vs. Temperature4
±1
ppm/°C typ
Gain = 1 to 16, external reference
±3
ppm/°C typ
Gain = 32 to 128, external reference
Power Supply Rejection
100
dB min
AIN = 1 V/gain, gain ≥ 4, external reference
ANALOG INPUTS
Differential Input Voltage Ranges
±VREF/Gain
V nom
VREF = REFIN(+)
− REFIN(−) or internal reference,
gain = 1 to 128
Absolute AIN Voltage Limits2
Unbuffered Mode
GND – 30 mV
V min
Gain = 1 or 2
AVDD + 30 mV
V max
Buffered Mode
GND + 100 mV
V min
Gain = 1 or 2
AVDD – 100 mV
V max
In-Amp Active
GND + 300 mV
V min
Gain = 4 to 128
AVDD – 1.1
V max
Common-Mode Voltage, VCM
0.5
V min
VCM = (AIN(+) + AIN(
−))/2, gain = 4 to 128
Analog Input Current
Buffered Mode or In-Amp Active
Average Input Current2
±1
nA max
Gain = 1 or 2, update rate < 100 Hz
±250
pA max
Gain = 4 to 128, update rate < 100 Hz
Average Input Current Drift
±2
pA/°C typ
Unbuffered Mode
Gain = 1 or 2
Average Input Current
±400
nA/V typ
Input current varies with input voltage
Average Input Current Drift
±50
pA/V/°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
100
dB min
AIN = 1 V/gain, gain ≥ 4
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz (FS[3:0] = 1001)6, 60 ± 1 Hz
(FS[3:0] = 1000)6


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