Datasheet

AD7476A/AD7477A/AD7478A
Rev. F | Page 12 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 7, Figure 8, and Figure 9 each show a typical FFT plot for
the AD7476A, AD7477A, and AD7478A, respectively, at a
1 MSPS sample rate and 100 kHz input frequency. Figure 10
shows the signal-to-(noise + distortion) ratio performance vs.
the input frequency for various supply voltages while sampling
at 1 MSPS with an SCLK frequency of 20 MHz for the
AD7476A.
Figure 11 and Figure 12 show INL and DNL performance for
the AD7476A. Figure 13 shows a graph of the total harmonic
distortion vs. the analog input frequency for different source
impedances when using a supply voltage of 3.6 V and sampling
at a rate of 1 MSPS (see the Analog Input section). Figure 14
shows a graph of the total harmonic distortion vs. the analog
input signal frequency for various supply voltages while
sampling at 1 MSPS with an SCLK frequency of 20 MHz.
FREQUENCY (kHz)
5
–55
–115
0 50050
SNR (dB)
100 150 200 250 300 350 400 450
–15
–35
–75
–95
8192 POINT FFT
V
DD
= 2.7V
f
SAMPLE
= 1MSPS
f
IN
= 100kHz
SINAD = 72.05dB
THD = –82.87dB
SFDR = –87.24dB
02930-007
Figure 7. AD7476A Dynamic Performance at 1 MSPS
FREQUENCY (kHz)
–45
–105
SNR (dB)
–5
–25
–65
–85
8192 POINT FFT
V
DD
= 2.35V
f
SAMPLE
= 1MSPS
f
IN
= 100kHz
SINAD = 61.67dB
THD = –79.59dB
SFDR = –82.93dB
0 50050 100 150 200 250 300 350 400 450
02930-008
Figure 8. AD7477A Dynamic Performance at 1 MSPS
FREQUENCY (kHz)
5
–25
–55
SNR (dB)
–5
–15
–35
–45
8192 POINT FFT
V
DD
= 2.35V
f
SAMPLE
= 1MSPS
f
IN
= 100kHz
SINAD = 49.77dB
THD = –75.51dB
SFDR = –70.71dB
0 50050 100 150 200 250 300 350 400 450
–75
–65
–85
–95
02930-009
Figure 9. AD7478A Dynamic Performance at 1 MSPS
FREQUENCY (kHz)
–66
–69
–72
10 1000
SINAD (dB)
100
–67
–68
–70
–71
–73
–74
V
DD
= 5.25V
V
DD
= 2.35V
V
DD
= 2.7V
V
DD
= 4.75V
V
DD
= 3.6V
02930-010
Figure 10. AD7476A SINAD vs. Input Frequency at 1 MSPS