AD7910ARM Ver la hoja de datos (PDF) - Analog Devices
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AD7910ARM Datasheet PDF : 24 Pages
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AD7910/AD7920
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 7 and Figure 8 show a typical FFT plot for the AD7920 and
AD7910, respectively, at a 250 kSPS sampling rate and a 100 kHz
input frequency.
Figure 9 shows the signal-to-(noise + distortion) ratio performance
vs. input frequency for various supply voltages while sampling at
250 kSPS with an SCLK frequency of 5 MHz for the AD7920.
Figure 10 and Figure 11 show typical INL and DNL performance
for the AD7920.
Figure 12 shows a graph of the total harmonic distortion vs. analog
input frequency for different source impedances when using a
supply voltage of 3.6 V and sampling at a rate of 250 kSPS. See the
Analog Input section.
Figure 13 shows a graph of the total harmonic distortion vs.
analog input signal frequency for various supply voltages while
sampling at 250 kSPS with an SCLK frequency of 5 MHz.
–5
8192 POINT FFT
VDD = 2.7V
–15 fSAMPLE = 250kSPS
fIN = 100kHz
SINAD = 72.05dB
–35
THD = –82.87dB
SFDR = –87.24dB
–55
–75
–95
–115
0
25
50
75
100
125
FREQUENCY (kHz)
Figure 7. AD7920 Dynamic Performance at 250 kSPS
15
8192 POINT FFT
VDD = 2.35V
–5 fSAMPLE = 250kSPS
fIN = 100kHz
SINAD = 61.67dB
–25
THD = –79.59dB
SFDR = –82.93dB
–45
–65
–85
–105
0
25
50
75
100
125
FREQUENCY (kHz)
Figure 8. AD7910 Dynamic Performance at 250 kSPS
–71.0
VDD = 5.25V
–71.5
–72.0
VDD = 4.75V VDD = 3.6V
–72.5
–73.0
VDD = 2.35V
VDD = 2.7V
–73.5
10
100
FREQUENCY (kHz)
1000
Figure 9. AD7920 SINAD vs. Input Frequency at 250 kSPS
1.0
0.8
VDD = 2.35V
TEMP = 25°C
fSAMPLE = 250kSPS
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
Figure 10. AD7920 INL Performance
Rev. C | Page 10 of 24
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