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AD7191BRUZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
AD7191
Rev. A | Page 3 of 20
SPECIFICATIONS
AV
DD
= 3 V to 5.25 V; DV
DD
= 2.7 V to 5.25 V; AGND = DGND = 0 V; REFIN(+) = AV
DD
; REFIN(−) = AGND; MCLK = 4.92 MHz; all
specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
1
AD7191B Unit Test Conditions/Comments
Output Data Rate 10, 50, 60, 120 Hz nom
No Missing Codes
2
24 Bits min
Resolution
See the RMS Noise and Resolution Specifications
section
RMS Noise and Update Rates
See the RMS Noise and Resolution Specifications
section
Integral Nonlinearity
Gain = 1
2
±10 ppm of FSR max ±2 ppm typical, AV
DD
= 5 V
±15 ppm of FSR max ±2 ppm typical., AV
DD
= 3 V
Gain > 1 ±5 ppm of FSR typ AV
DD
= 5 V
±12 ppm of FSR typ AV
DD
= 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
Normal Mode Rejection
2
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
@ DC
2
100 dB min Gain = 1, AIN = 1 V
@ DC 110 dB min Gain > 1, AIN = 1 V/gain
@ 50 Hz, 60 Hz
2
120 dB min 10 Hz output data rate, 50 ± 1 Hz, 60 ± 1 Hz
@ 50 Hz, 60 Hz
2
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 ±V
REF
/gain V nom
V
REF
= REFIN(+) − REFIN(−), gain = 1, 8, 64, or 128
±(AV
DD
– 1.25 V)/gain V min/V max Gain > 1
Absolute AIN Voltage Limits
2
AGND + 250 mV V min
AV
DD
− 250 mV
V max
AD7191
Rev. A | Page 4 of 20
Parameter
1
AD7191B Unit Test Conditions/Comments
Analog Input Current
Input Current
2
±2 nA max Gain = 1
±3 nA max Gain > 1
Input Current Drift ±5 pA/°C typ
REFERENCE INPUT
REFIN Voltage AV
DD
V nom
REFIN = REFIN(+) − REFIN(−).
Reference Voltage Range
2
1 V min
AV
DD
V max
The differential input must be limited to
±(AV
DD
− 1.25 V)/gain when gain > 1.
Absolute REFIN Voltage Limits
2
AGND – 50 mV V min
AV
DD
+ 50 mV V max
Average Reference Input Current 4.5 μA/V typ
Average Reference Input Current
Drift
±0.03 nA/V/°C typ External clock.
±1.3 nA/V/°C typ Internal clock.
Normal-Mode Rejection
2
Same as for analog
inputs
Common-Mode Rejection 100 dB typ
TEMPERATURE SENSOR
Accuracy +2 °C typ Applies after user calibration at one temperature.
Sensitivity 2815 Codes/°C typ
BRIDGE POWER-DOWN SWITCH
R
ON
10 Ω max
Allowable Current
2
30 mA max Continuous current.
INTERNAL/EXTERNAL CLOCK
Internal Clock
Frequency 4.92 + 4% MHz min/MHz max
Duty Cycle 50:50 % typ
External Clock/Crystal
Frequency 4.9152 MHz nom
2.4576/5.12 MHz min/MHz max
Input Low Voltage, V
INL
0.8 V max DV
DD
= 5 V.
0.4 V max DV
DD
= 3 V.
Input High Voltage, V
INH
2.5 V min DV
DD
= 3 V.
3.5 V min DV
DD
= 5 V.
Input Current ±10 μA max MCLKIN = DV
DD
or DGND.
LOGIC INPUTS
Input High Voltage, V
INH
2
2 V min
Input Low Voltage, V
INL
2
0.8 V max
Hysteresis
2
0.1/0.25 V min/V max
Input Currents ±10 μA max V
IN
= DV
DD
or DGND.
LOGIC OUTPUT (DOUT/RDY)
Output High Voltage, V
OH
2
DV
DD
− 0.6
V min DV
DD
= 3 V, I
SOURCE
= 100 μA.
Output Low Voltage, V
OL
2
0.4 V max DV
DD
= 3 V, I
SINK
= 100 μA.
Output High Voltage, V
OH
2
4 V min DV
DD
= 5 V, I
SOURCE
= 200 μA.
Output Low Voltage, V
OL
2
0.4 V max DV
DD
= 5 V, I
SINK
= 1.6 mA.
AD7191
Rev. A | Page 5 of 20
Parameter
1
AD7191B Unit Test Conditions/Comments
Floating-State Leakage Current ±10 μA max
Floating-State Output Capacitance 10 pF typ
Data Output Coding Offset binary
POWER REQUIREMENTS
3
Power Supply Voltage
AV
DD
− AGND
3/5.25 V min/V max
DV
DD
− DGND
2.7/5.25 V min/V max
Power Supply Currents
AI
DD
Current 0.85 mA max 0.75 mA typical, gain = 1.
3.6 mA max 3 mA typical, gain = 8.
5 mA max 4 mA typical, gain = 64 or 128.
DI
DD
Current 0.4 mA max 0.35 mA typical, DV
DD
= 3 V.
0.6 mA max 0.5 mA typical, DV
DD
= 5 V.
1.5 mA typ External crystal used.
I
DD
(Power-Down Mode) 3 μA max
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
Digital inputs equal to DV
DD
or DGND.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

AD7191BRUZ

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Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 2CH Ultra Low Noise 24Bit
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