AD7708 Analog Devices, AD7708 Datasheet - Page 4

• Manufacturer Part Number: AD7708
• Description: 16-Bit 8/10-Channel, Low Voltage, Low Power, Sigma Delta ADC
• Manufacturer: Analog Devices

Specifications of AD7708

• Resolution (bits): 16bit
• # Chan: 10
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

AD7718–SPECIFICATIONS
2.5 V ; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications T
Parameter
AD7718 (CHOP ENABLED)
ANALOG INPUTS
REFERENCE INPUTS (REFIN1 AND REFIN2)
LOGIC INPUTS
Output Update Rate
No Missing Codes
Resolution
Output Noise and Update Rates
Integral Nonlinearity
Offset Error
Offset Error Drift vs. Temp
Full-Scale Error
Gain Drift vs. Temp
Differential Input Full-Scale Voltage
Range Matching
Absolute AIN Voltage Limits
Absolute AINCOM Voltage Limits
Analog Input Current
AINCOM Input Current
Normal-Mode Rejection
Common-Mode Rejection
REFIN(+) to REFIN(–) Voltage
REFIN(+) to REFIN(–) Range
REFIN Common-Mode Range
Reference DC Input Current
Reference DC Input Current Drift
Normal-Mode Rejection
Common-Mode Rejection
All Inputs Except SCLK and XTAL1
DC Input Current
DC Input Current Drift
DC Input Current
DC Bias Current Drift
@ 50 Hz
@ 60 Hz
@ DC
@ 50 Hz
@ 60 Hz
@ 50 Hz
@ 60 Hz
@ DC
@ 50 Hz
@ 60 Hz
V
V
V
INL
INL
INH
, Input Low Voltage
, Input Low Voltage
, Input High Voltage
2
2
3
5
3
2
4
2
2
2
2
2
4
2
2
2
B Grade
5.4
105
24
13
18
See Tables in
ADC Description
± 10
± 3
10
± 10
± 0.5
±1.024 × REFIN/GAIN
± 2
AGND + 100 mV
AV
AGND – 30 mV
AV
± 1
± 5
± 125
± 2
100
100
90
100
100
2.5
1
AV
AV
± 0.5
± 0.01
100
100
110
0.8
0.4
2.0
AGND – 30 mV
110
110
DD
DD
DD
DD
1
– 100 mV
+ 30 mV
+ 30 mV
(AV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, DV
Unit
Hz min
Hz max
Bits min
Bits p-p
Bits p-p
ppm of FSR max
µV typ
nV/°C typ
µV/°C typ
ppm/°C typ
V nom
µV typ
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
dB min
dB min
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
V max
V max
V min
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) =
Test Conditions
CHOP = 0
20 Hz Update Rate
± 20 mV Range, 20 Hz Update Rate
± 2.56 V Range, 20 Hz Update Rate
2 ppm Typical
REFIN Refers to Both REFIN1 and
REFIN2. REFIN = REFIN(+) REFIN(–)
GAIN = 1 to 128
Analog Input = 18 mV
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, 20 Hz Update Rate
60 Hz ± 1 Hz, 20 Hz Update Rate
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
50 Hz ± 1 Hz, 20 Hz Update Rate
60 Hz ± 1 Hz, 20 Hz Update Rate
DV
DV
DV
DD
DD
DD
= 5 V
= 3 V
= 3 V or 5 V
MIN
to T
MAX
unless otherwise noted.)