AD7680 データシートの表示（PDF） - Analog Devices
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AD7680 Datasheet PDF : 24 Pages
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AD7680
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5 shows a typical FFT plot for the AD7680 at 100 kSPS
sample rate and 10 kHz input frequency. Figure 6 shows the
signal-to-(noise + distortion) ratio performance versus the
input frequency for various supply voltages while sampling at
100 kSPS with an SCLK of 2.5 MHz.
Figure 7 shows a graph of the total harmonic distortion versus
the analog input frequency for various supply voltages, while
Figure 8 shows a graph of the total harmonic distortion versus
the analog input frequency for various source impedances (see
the Analog Input section). Figure 9 and Figure 10 show the
typical INL and DNL plots for the AD7680.
0
VDD = 5V
–20
FSAMPLE = 100kSPS
FIN = 10kHz
SNR = 88.28dB
–40
SINAD = 87.82dB
THD = –97.76dB
SFDR = –98.25dB
–60
–80
–100
–120
–140
–160
0
10k
20k
30k
40k
50k
FREQUENCY (kHz)
Figure 5. AD7680 Dynamic Performance at 100 kSPS
95
FSAMPLE = 100kSPS
TA = 25°C
90
VDD = 5.25V
85
80
10
VDD = 2.5V
INPUT FREQUENCY (kHz)
VDD = 4.75V
VDD = 4.3V
VDD = 3.6V
VDD = 3.0V
VDD = 2.7V
100
Figure 6. AD7680 SINAD vs. Analog Input Frequency
for Various Supply Voltages at 100 kSPS
110
FSAMPLE = 100kSPS
TA = 25°C
105
VDD = 4.3V
VDD = 4.75V
VDD = 3.6V
100
VDD = 5.25V
VDD = 3.0V
VDD = 2.7V
95
VDD = 2.5V
90
10
100
INPUT FREQUENCY (kHz)
Figure 7. AD7680 THD vs. Analog Input Frequency
for Various Supply Voltages at 100 kSPS
110
RIN = 10Ω
105
100
RIN = 50Ω
95
RIN = 100Ω
90
85
80
FSAMPLE = 100kSPS
TA = 25°C
VDD = 4.75V
75
10
RIN = 1000Ω
100
INPUT FREQUENCY (kHz)
Figure 8. AD7680 THD vs. Analog Input Frequency
for Various Source Impedances
Rev. A | Page 10 of 24
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