AD7781 Analog Devices, AD7781 Datasheet - Page 9

• Manufacturer Part Number: AD7781
• Description: 20-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC
• Manufacturer: Analog Devices

Specifications of AD7781

• Resolution (bits): 20bit
• # Chan: 1
• Sample Rate: 16.7SPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip
• Ain Range: ± (Vref/Gain) ,10V p-p,78 mV p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

524,276
524,275
524,274
524,273
–0.5
–1.0
–1.5
–2.0
–2.5
800
600
400
200
3.0
2.5
2.0
1.5
1.0
0.5
Figure 14. Noise (V
–0.04
0
0
Figure 16. Integral Nonlinearity (V
0
–0.03
(V
524,274
Figure 15. Noise Distribution Histogram
REF
= AV
200
–0.02
DD
REF
, Update Rate = 10 Hz, Gain = 1)
= AV
–0.01
400
DD
, Update Rate = 10 Hz, Gain = 1)
524,275
V
SAMPLE
CODE
IN
0
(V)
REF
600
0.01
= AV
DD
0.02
, Gain = 128)
800
0.03
0.04
1000
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–100
–150
–200
–10
–0.5
–1.0
–1.5
–2.0
150
100
–50
10
–2
–4
–6
–8
2.0
1.5
1.0
0.5
50
8
6
4
2
0
–60
0
–60
0
–6
Figure 17. Integral Nonlinearity (V
Figure 19. Gain Error vs. Temperature (Gain = 128)
Figure 18. Offset vs. Temperature (Gain = 128)
–40
–40
–4
–20
–20
0
–2
TEMPERATURE (°C)
0
TEMPERATURE (°C)
20
20
V
IN
0
(V)
40
40
REF
= AV
60
60
2
DD
80
, Gain = 1)
80
4
100
100
AD7781
120
120
6