AD7940BRM-REEL7(Rev0) データシートの表示（PDF） - Analog Devices
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AD7940BRM-REEL7 Datasheet PDF : 20 Pages
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AD7940
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5 shows a typical FFT plot for the AD7940 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 AD7940.
0
VDD = 4.75V
–20
FSAMPLE = 100kSPS
FIN = 10kHz
SNR = 84.48dB
–40
SINAD = 84.35dB
THD = –98.97dB
SFDR = –100.84dB
–60
–80
–100
–120
–140
–160
0
10k
20k
30k
40k
50k
FREQUENCY (kHz)
Figure 5. AD7940 Dynamic Performance at 100 kSPS
90
FSAMPLE = 100kSPS
TA = 25°C
VDD = 5.25V VDD = 4.75V
85
VDD = 4.3V
VDD = 3.6V
80
VDD = 3V
VDD = 2.5V
VDD = 2.7V
75
10
100
INPUT FREQUENCY (kHz)
Figure 6. AD7940 SINAD vs. Analog Input Frequency
for Various Supply Voltages at 100 kSPS
110
FSAMPLE = 100kSPS
TA = 25°C
105
VDD = 3V VDD = 3.6V
100
95
VDD = 2.7V
VDD = 4.3V
90 VDD = 5.25V
VDD = 4.75V
VDD = 2.5V
85
80
10
100
INPUT FREQUENCY (kHz)
Figure 7. AD7940 THD vs. Analog Input Frequency
for Various Supply Voltages at 100 kSPS
110
FSAMPLE = 100kSPS
TA = 25°C
105 VDD = 4.75V
100
RIN = 10Ω
95
RIN = 50Ω
90
RIN = 100Ω
85
80
75
70
10
RIN = 1000Ω
100
INPUT FREQUENCY (kHz)
Figure 8. AD7940 THD vs. Analog Input Frequency
for Various Source Impedances
Rev. 0 | Page 9 of 20
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