AD7191
Rev. A | Page 3 of 20
SPECIFICATIONS
AVDD = 3 V to 5.25 V; DVDD = 2.7 V to 5.25 V; AGND = DGND = 0 V; REFIN(+) = AVDD; REFIN() = AGND; MCLK = 4.92 MHz; all
specifications TMIN to TMAX, unless otherwise noted.
Table 1.
AD7191B
Unit
Test Conditions/Comments
Output Data Rate
10, 50, 60, 120
Hz nom
24
Bits min
Resolution
section
RMS Noise and Update Rates
section
Integral Nonlinearity
±10
ppm of FSR max
±2 ppm typical, AVDD = 5 V
±15
ppm of FSR max
±2 ppm typical., AVDD = 3 V
Gain > 1
±5
ppm of FSR typ
AVDD = 5 V
±12
ppm of FSR typ
AVDD = 3 V
Offset Error
±150/gain
μV typ
Offset Error Drift vs. Temperature
±150/gain
nV/°C typ
Gain = 1 or 8
±5
nV/°C typ
Gain = 64 or 128
Offset Error Drift vs. Time
25
nV/1000 hours typ
Gain = 64 or 128
Gain Error
±0.4
% typ
Gain Drift vs. Temperature
±1
ppm/°C typ
Gain Drift vs. Time
10
ppm/1000 hours typ
Gain = 1
Power Supply Rejection
90
dB typ
Gain = 1, AIN = 1 V
95
dB min
110 dB typical, gain > 1, AIN = 1 V/gain
Internal Clock
@ 50 Hz, 60 Hz
100
dB min
10 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz
74
dB min
50 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz
@ 60 Hz
97
dB min
60 Hz output data rate, 60 ± 1 Hz.
External Clock
@ 50 Hz, 60 Hz
120
dB min
10 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz.
82
dB min
50 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz.
@ 60 Hz
120
dB min
60 Hz output data rate, 60 ± 1 Hz
Common-Mode Rejection
100
dB min
Gain = 1, AIN = 1 V
@ DC
110
dB min
Gain > 1, AIN = 1 V/gain
120
dB min
10 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz
120
dB min
50 ± 1 Hz (50 Hz output data rate), 60 ± 1 Hz
(60 Hz output data rate)
ANALOG INPUTS
Differential Input Voltage Ranges
±VREF/gain
V nom
VREF = REFIN(+)
REFIN(), gain = 1, 8, 64, or 128
±(AVDD – 1.25 V)/gain
V min/V max
Gain > 1
AGND + 250 mV
V min
AVDD
250 mV
V max