AD7794/AD7795
Parameter
Normal Mode Rejection
Internal Clock
@ 50 Hz, 60 Hz
@ 50 Hz
@ 60 Hz
External Clock
@ 50 Hz, 60 Hz
@ 50 Hz
@ 60 Hz
Common-Mode Rejection
AD7794B/AD7795B
@ DC
@ 50 Hz, 60 Hz
2
@ 50 Hz, 60 Hz
2
AD7794C
@ DC
@ 50 Hz, 60 Hz
2
@ 50 Hz, 60 Hz
2
CHOP ENABLED or DISABLED
REFERENCE INPUT
Internal Reference
Internal Reference Initial
Accuracy
Internal Reference Drift
2
Power Supply Rejection
External Reference
External REFIN Voltage
Reference Voltage Range
AD7794/AD7795
Unit
Test Conditions/Comments
60
78
86
60
94
90
dB min
dB min
dB min
dB min
dB min
dB min
70 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
90 dB typ, 50 ± 1 Hz, FS[3:0] = 1001
100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000
70 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
100 dB typ, 50 ± 1 Hz, FS[3:0] = 1001
100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000
100
100
100
97
97
97
dB min
dB min
dB min
dB min
dB min
dB min
AIN = 1 V/gain, with gain = 4, AMP-CM Bit = 1
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
50 ± 1 Hz, FS[3:0] = 1001; 60 ± 1 Hz, FS[3:0] = 1000
AIN = 1 V/gain, with gain = 4, AMP-CM Bit = 1
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
50 ± 1 Hz, FS[3:0] = 1001; 60 ± 1 Hz, FS[3:0] = 1000
1.17 ± 0.01%
4
15
85
2.5
0.1
AV
DD
GND − 30 mV
AV
DD
+ 30 mV
400
±0.03
V min/max
ppm/°C typ
ppm/°C max
dB typ
V nom
V min
V max
V min
V max
nA/V typ
nA/V/°C typ
AV
DD
= 4 V, T
A
= 25°C
REFIN = REFIN(+) − REFIN(−)
When V
REF
= AV
DD
, the differential input must be
limited to 0.9 × V
REF
/gain if the in-amp is active
Absolute REFIN Voltage Limits
Average Reference Input
Current
Average Reference Input
Current Drift
Normal Mode Rejection
Common-Mode Rejection
Reference Detect Levels
EXCITATION CURRENT SOURCES
(IEXC1 and IEXC2)
Output Current
Initial Tolerance at 25°C
Drift
Current Matching
Drift Matching
Line Regulation (AV
DD
)
Load Regulation
Output Compliance
Same as for analog inputs
100
0.3
0.65
dB typ
V min
V max
NOXREF bit active if V
REF
< 0.3 V
10/210/1000
±5
200
±0.5
50
2
0.2
AV
DD
− 0.65
AV
DD
− 1.1
GND − 30 mV
μA nom
% typ
ppm/°C typ
% typ
ppm/°C typ
%/V typ
%/V typ
V max
V max
V min
Rev. D | Page 5 of 36
Matching between IEXC1 and IEXC2, V
OUT
= 0 V
AV
DD
= 5 V ± 5%
Current sources programmed to 10 μA or 210 μA
Current sources programmed to 1 mA
ROCHESTER [ Rochester Electronics ]
