AD7798 Analog Devices, AD7798 Datasheet - Page 3

• Manufacturer Part Number: AD7798
• Description: 3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp
• Manufacturer: Analog Devices

Specifications of AD7798

• Resolution (bits): 16bit
• # Chan: 3
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

SPECIFICATIONS
AV
otherwise noted.
Table 1.
Parameter
ADC CHANNEL
ANALOG INPUTS
Output Update Rate
No Missing Codes
Resolution
Output Noise and Update Rates
Integral Nonlinearity
Offset Error
Offset Error Drift vs. Temperature
Full-Scale Error
Gain Drift vs. Temperature
Power Supply Rejection
Differential Input Voltage Ranges
Absolute AIN Voltage Limits
Analog Input Current
Normal Mode Rejection
Common-Mode Rejection
DD
Unbuffered Mode
Buffered Mode
In-Amp Active
Common-Mode Voltage, V
Buffered Mode or In-Amp Active
Unbuffered Mode
@ 50 Hz, 60 Hz
@ 50 Hz
@ 60 Hz
@ DC
@ 50 Hz, 60 Hz
@ 50 Hz, 60 Hz
= 2.7 V to 5.25 V; DV
Average Input Current
Average Input Current Drift
Average Input Current
Average Input Current Drift
3
3, 5
2
2
2
2
DD
4
2
2
= 2.7 V to 5.25 V; GND = 0 V; REFIN(+) = AV
CM
4
AD7798B/AD7799B
4.17 − 470
24
16
±15
±1
±10
±10
±1
100
±V
GND − 30 mV
AV
GND + 100 mV
AV
GND + 300 mV
AV
0.5
±1
±250
±1
±2
±400
±50
65
80
90
100
100
100
DD
DD
DD
REF
/gain
+ 30 mV
– 100 mV
− 1.1
Rev. A | Page 3 of 28
1
dB min
V min
V min
pA/°C typ
pA/V/°C typ
dB min
dB min
Unit
Hz nom
Bits min
Bits min
ppm of FSR max
μV typ
nV/°C typ
μV typ
ppm/°C typ
V nom
V min
V max
V max
V max
V min
nA max
pA max
nA max
nA/V typ
dB min
dB min
dB min
dB min
DD
; REFIN(−) = 0 V. All specifications T
Test Conditions/Comments
AD7799: f
AD7798
See Table 5 to Table 8
See Table 5 to Table 8
AIN = 1 V/gain, gain ≥ 4
V
Gain = 1 or 2
Gain = 1 or 2
Gain = 4 to 128
V
Gain = 1 or 2, update rate < 100 Hz
Gain = 4 to 128, update rate < 100 Hz
AIN3(+)/AIN3(−), update rate < 100 Hz
Gain = 1 or 2
Input current varies with input voltage
80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz (FS[3:0] = 1010)
90 dB typ, 50 ± 1 Hz (FS[3:0] = 1001)
100 dB typ, 60 ± 1 Hz (FS[3:0] = 1000)
AIN = 1 V/gain, gain ≥ 4
50 ± 1 Hz, 60 ± 1 Hz (FS[3:0] = 1010)
50 ± 1 Hz (FS[3:0] = 1001
(FS[3:0] = 1000
REF
CM
= (AIN(+) + AIN(−))/2, gain = 4 to 128
= REFIN(+) – REFIN(–), gain = 1 to 128
ADC
< 242 Hz
6
)
6
), 60 ± 1 Hz
AD7798/AD7799
MIN
to T
6
6
6
MAX
, unless
6