AD7708 Analog Devices, AD7708 Datasheet - Page 6

• 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

AD7708 SPECIFICATIONS
REFIN(+) = 2.5 V; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffers Enabled. All specifications T
T
Parameter
AD7708 (CHOP DISABLED)
ANALOG INPUTS
REFERENCE INPUTS (REFIN1 AND REFIN2)
AD7708/AD7718
MAX
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
Negative Full-Scale Error
Differential Input Full-Scale Voltage
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
unless otherwise noted.)
DC Input Current
DC Bias 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
3
3
2
4
2
2
2
2
4
2
B Grade
16.06
1.365
16
13
16
See Tables in ADC Description
± 15
± 0.65
± 200
± 0.75
± 0.5
± 0.003
±1.024 × REFIN/GAIN
AGND + 100 mV
AV
AGND – 30 mV
AV
± 1
± 5
± 125
± 2
100
100
90
100
100
2.5
1
AV
AGND – 30 mV
AV
0.5
± 0.1
100
100
100
100
100
1
DD
DD
DD
DD
(AV
– 100 mV
+ 30 mV
+ 30 mV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, DV
Unit
Hz min
kHz max
Bits min
Bits p-p
Bits p-p
ppm of FSR max
LSB typ
nV/°C typ
LSB typ
ppm/°C typ
% FSR typ
V nom
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 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
DD
Test Conditions
CHOP = 1
± 20 mV Range, SF Word = 69
± 2.56 V Range, SF Word = 69
2ppm Typical
Following a Self-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
= 2.7 V to 3.6 V or 4.75 V to 5.25 V,
MIN
to