AD7708BRZ Datasheet, PDF (3/44 Pages) Analog Devices – 8-/10-Channel, Low Voltage, Low Power,
- ADCs

AD7708/AD7718
AD7718 SPECIFICATIONS1
(AV_DD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, DV_DD = 2.7 V to 3.6 V or 4.75 V to 5.25 V,
REFIN(+) = 2.5 V; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications T_MIN to
T_MAX unless otherwise noted.)
Parameter
AD7718 (CHOP DISABLED)
Output Update Rate
No Missing Codes²
Resolution
Output Noise and Update Rates
Integral Nonlinearity
Offset Error³
Offset Error Drift vs. Temp⁴
Full-Scale Error³
Gain Drift vs. Temp⁴
Negative Full-Scale Error
ANALOG INPUTS
Differential Input Full-Scale Voltage
B Grade
16.06
1.365
24
13
18
See Tables in
ADC Description
± 10
Table VII
Unit
Hz min
kHz max
Bits min
Bits p-p
Bits p-p
ppm of FSR max
µV typ
± 200
± 10
± 0.5
± 0.003
nV/°C typ
µV typ
ppm/°C typ
% FSR max
± 1.024 × REFIN/GAIN V nom
Absolute AIN Voltage Limits
Absolute AINCOM Voltage Limits
Analog Input Current
DC Input Current²
DC Bias Current Drift
AINCOM Input Current
DC Input Current²
DC Bias Current Drift
Normal-Mode Rejection²
@ 50 Hz
@ 60 Hz
Common-Mode Rejection
@ DC
AGND + 100 mV
AV_DD – 100 mV
AGND – 30 mV
AV_DD + 30 mV
±1
±5
± 125
±2
100
100
90
V min
V max
V min
V max
nA max
pA/°C typ
nA/V typ
pA/V/°C typ
dB min
dB min
dB min
@ 50 Hz
100
@ 60 Hz
100
REFERENCE INPUTS (REFIN1 AND REFIN2)
REFIN(+) to REFIN(–) Voltage
2.5
REFIN(+) to REFIN(–) Range²
1
REFIN Common-Mode Range
AV_DD
AGND – 30 mV
Reference DC Input Current
AV_DD + 30 mV
0.5
Reference DC Input Current Drift
± 0.1
Normal-Mode Rejection²
@ 50 Hz
100
@ 60 Hz
100
Common-Mode Rejection
@ DC
100
@ 50 Hz
100
@ 60 Hz
100
dB typ
dB typ
V nom
V min
V max
V min
V max
µA/V typ
nA/V/°C typ
dB min
dB min
dB typ
dB typ
dB typ
Test Conditions
CHOP = 1
± 20 mV Range, SF = 69
± 2.56 V Range, SF = 69
2 ppm Typical
Offset Error is in the order of the noise for the
programmed gain and update rate following a
calibration
REFIN Refers to Both REFIN1 and
REFIN2. REFIN = REFIN(+) –REFIN(–)
GAIN = 1 to 128
AIN1–AIN10 and AINCOM with
NEGBUF = 1
NEGBUF = 0
AIN1–AIN10 and AINCOM with NEGBUF = 1
NEGBUF = 0
± 2.56 V Range
50 Hz ± 1 Hz, SF Word = 82
60 Hz ± 1 Hz, SF Word = 68
100 dB typ, Analog Input = 1 V,
Input Range = ± 2.56 V
110 dB typ on ± 20 mV Range
50 Hz ± 1 Hz, SF Word = 82
60 Hz ± 1 Hz, SF Word = 68
REFIN Refers to Both REFIN1 and REFIN2
50 Hz ± 1 Hz, SF Word = 82
60 Hz ± 1 Hz, SF Word = 68
Input Range = ± 2.56 V
Analog Input = 1 V. Input Range = ± 2.56 V
REV. 0
–3–