AD7781 Analog Devices, AD7781 Datasheet - Page 8

• 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

AD7781
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 8. C Grade Noise (V
Figure 10. C Grade Noise (V
524,294
524,293
524,292
524,291
524,290
524,289
524,288
524,287
524,286
524,281
524,280
524,279
524,278
524,277
524,276
524,275
524,274
500
400
300
200
100
524,286
0
0
0
(V
Figure 9. C Grade Noise Distribution Histogram
REF
= AV
524,288
200
200
DD
, Update Rate = 16.7 Hz, Gain = 128)
REF
REF
= AV
= AV
400
400
524,290
DD
CODE
SAMPLE
SAMPLE
DD
, Update Rate = 16.7 Hz, Gain = 128)
, Update Rate = 10 Hz, Gain = 128)
600
600
524,292
800
800
524,294
1000
1000
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524,289
524,288
524,287
524,286
Figure 12. Noise (V
600
400
200
505
500
495
524,275
0
0
Figure 11. C Grade Noise Distribution Histogram
(V
(V
REF
524,287
REF
Figure 13. Noise Distribution Histogram
= AV
= AV
200
524,277
DD
DD
REF
, Update Rate = 10 Hz, Gain = 128)
, Update Rate = 16.7 Hz, Gain = 1)
= AV
DD
400
, Update Rate = 16.7 Hz, Gain = 1)
524,288
SAMPLE
CODE
CODE
524,279
600
800
MORE
1000