Datasheet

AD7475/AD7495
Rev. B | Page 12 of 24
TYPICAL PERFORMANCE CURVES
Figure 7 shows a typical FFT plot for the AD7475 at a 1 MHz
sample rate and a 100 kHz input frequency.
FREQUENCY (kHz)
–115
0
SINAD (dB)
50 100 150 200 250 300
–95
–75
–55
–35
350 400 500450
–15
8192 POINT FFT
f
SAMPLE
= 1MSPS
f
IN
= 100kHz
SINAD = 70.46dB
THD = –87.7dB
SFDR = –89.5dB
01684-B-007
Figure 7. AD7475 Dynamic Performance
Figure 8 shows a typical FFT plot for the AD7495 at a 1 MHz
sample rate and a 100 kHz input frequency.
FREQUENCY (kHz)
–115
0
SINAD (dB)
50 100 150 200 250 300
–95
–75
–55
–35
350 400 500450
–15
8192 POINT FFT
f
SAMPLE
= 1MSPS
f
IN
= 100kHz
SINAD = 69.95dB
THD = –89.2dB
SFDR = –91.2dB
01684-B-008
Figure 8. AD7495 Dynamic Performance
Figure 9 shows the SINAD performance vs. input frequency for
various supply voltages while sampling at 1 MSPS with an SCLK
of 20 MHz.
INPUT FREQUENCY (kHz)
68.5
SINAD (dB)
10 100
69.0
69.5
70.0
70.5
1000
71.0
V
DD
= V
DRIVE
= 5.25V
V
DD
= V
DRIVE
= 3.60V
V
DD
= V
DRIVE
= 2.70V
V
DD
= V
DRIVE
= 4.75V
01684-B-009
Figure 9. AD7495 SINAD vs. Input Frequency at 1 MSPS