ADUC814BRU View Datasheet(PDF) - Analog Devices
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ADUC814BRU Datasheet PDF : 72 Pages
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Figure 13 and Figure 14 show typical FFT plots for the ADuC814.
These plots were generated using an external clock input via
P3.5 to achieve coherent sampling. The ADC is using its internal
reference (2.5 V) sampling a full-scale, 10 kHz sine wave test
tone input at a sampling rate of 149.79 kHz. The resultant FFTs
shown at 5 V and 3 V supplies illustrate an excellent 100 dB
noise floor, a 71 dB signal-to-noise ratio (SNR), and a THD
greater than −80 dB.
20
AVDD/DVDD = 5V
0
fS = 149.79kHz
fIN = 9.910kHz
–20
SNR = 71.3dB
THD = –88.0dB
ENOB = 11.6
–40
–60
–80
–100
–120
–140
–160
0
10
20
30
40
50
60
70
FREQUENCY (kHz)
Figure 13. ADuC814 Dynamic Performance at VDD = 5 V
20
AVDD/DVDD = 3V
0
fS = 149.79kHz
fIN = 9.910kHz
–20
SNR = 71.3dB
THD = –88.0dB
ENOB = 11.6
–40
–60
–80
–100
–120
–140
–160
0
10
20
30
40
50
60
70
FREQUENCY (kHz)
Figure 14. ADuC814 Dynamic Performance at VDD = 3 V
ADuC814
Figure 15 and Figure 16 show typical dynamic performance
versus external reference voltages. Again excellent ac performance
can be observed in both plots with some roll-off being observed
as VREF falls below 1 V.
80
–70
AVDD /DVDD = 5V
75
fS = 152kHz
–75
SNR
70
–80
65
–85
THD
60
–90
55
–95
50
0.5
1.0
1.5
2.0
2.5
5.0
EXTERNAL REFERENCE (V)
–100
Figure 15. Typical Dynamic Performance vs. VREF, VDD = 5 V
80
–70
AVDD/DVDD = 3V
fS = 152kHz
75
–75
SNR
70
–80
THD
65
–85
60
–90
55
–95
50
0.5
1.0
1.5
2.0
2.5
3.0
EXTERNAL REFERENCE (V)
–100
Figure 16. Typical Dynamic Performance vs. VREF, VDD = 3 V
Rev. A | Page 15 of 72
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