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EVAL-AD7795EB 数据表(PDF) 5 Page - Analog Devices

部件名 EVAL-AD7795EB
功能描述  6-Channel, Low Noise, Low Power, 24-/16-Bit 誇-? ADC with On-Chip In-Amp and Reference
PDF  36 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

EVAL-AD7795EB 数据表(HTML) 5 Page - Analog Devices

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AD7794/AD7795
Rev. D | Page 5 of 36
Parameter1
AD7794/AD7795
Unit
Test Conditions/Comments
Normal Mode Rejection2, 6
Internal Clock
@ 50 Hz, 60 Hz
60
dB min
70 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
@ 50 Hz
78
dB min
90 dB typ, 50 ± 1 Hz, FS[3:0] = 1001
@ 60 Hz
86
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000
External Clock
@ 50 Hz, 60 Hz
60
dB min
70 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
@ 50 Hz
94
dB min
100 dB typ, 50 ± 1 Hz, FS[3:0] = 1001
@ 60 Hz
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000
Common-Mode Rejection
AD7794B/AD7795B
@ DC
100
dB min
AIN = 1 V/gain, with gain = 4, AMP-CM Bit = 1
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz, FS[3:0] = 1001; 60 ± 1 Hz, FS[3:0] = 1000
AD7794C
@ DC
97
dB min
AIN = 1 V/gain, with gain = 4, AMP-CM Bit = 1
@ 50 Hz, 60 Hz2
97
dB min
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
@ 50 Hz, 60 Hz2
97
dB min
50 ± 1 Hz, FS[3:0] = 1001; 60 ± 1 Hz, FS[3:0] = 1000
CHOP ENABLED or DISABLED
REFERENCE INPUT
Internal Reference
Internal Reference Initial
Accuracy
1.17 ± 0.01%
V min/max
AVDD = 4 V, TA = 25°C
Internal Reference Drift2
4
ppm/°C typ
15
ppm/°C max
Power Supply Rejection
85
dB typ
External Reference
External REFIN Voltage
2.5
V nom
REFIN = REFIN(+) − REFIN(−)
Reference Voltage Range2
0.1
V min
AVDD
V max
When VREF = AVDD, the differential input must be
limited to 0.9 × VREF/gain if the in-amp is active
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 Rejection2
Same as for analog inputs
Common-Mode Rejection
100
dB typ
Reference Detect Levels
0.3
V min
0.65
V max
NOXREF bit active if VREF < 0.3 V
EXCITATION CURRENT SOURCES
(IEXC1 and IEXC2)
Output Current
10/210/1000
μA nom
Initial Tolerance at 25°C
±5
% typ
Drift
200
ppm/°C typ
Current Matching
±0.5
% typ
Matching between IEXC1 and IEXC2, VOUT = 0 V
Drift Matching
50
ppm/°C typ
Line Regulation (AVDD)
2
%/V typ
AVDD = 5 V ± 5%
Load Regulation
0.2
%/V typ
Output Compliance
AVDD − 0.65
V max
Current sources programmed to 10 μA or 210 μA
AVDD − 1.1
V max
Current sources programmed to 1 mA
GND − 30 mV
V min



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