Datasheet

AD7466/AD7467/AD7468
Rev. C | Page 14 of 28
5
–5
SNR (dB)
–45
–35
–25
–15
–55
–65
–75
–85
–95
0 5 10 15 20 25 30 35 40 45 50
FREQUENCY (kHz)
8192 POINT FFT
V
DD
= 1.8V
f
SAMPLE
= 100kSPS
f
IN
= 30kHz
SINAD = 49.83dB
THD = –79.37dB
SFDR = –70.46dB
02643-009
Figure 8. AD7468 Dynamic Performance at 100 kSPS
–65
SINAD (dB)
–72
–71
–70
–69
–68
–67
–66
–73
10 100
INPUT FREQUENCY (kHz)
V
DD
= 3.6V V
DD
= 3V V
DD
= 2.7V
TEMP = 25°C
V
DD
= 1.8V V
DD
= 1.6V V
DD
= 2.2V
02643-010
Figure 9. AD7466 SINAD vs. Analog Input Frequency
at 100 kSPS for Various Supply Voltages
–68.0
SNR (dB)
–72.5
–72.0
–71.5
–71.0
–70.5
–70.0
–69.0
–68.5
–69.5
–73.0
10 100
INPUT FREQUENCY (kHz)
V
DD
= 3.6V V
DD
= 3V V
DD
= 2.7V
TEMP = 25 ° C
V
DD
= 1.8V
V
DD
= 1.6V
V
DD
= 2.2V
02643-011
Figure 10. AD7466 SNR vs. Analog Input Frequency
at 100 kSPS for Various Supply Voltages
–65
THD (dB)
–83
–81
–79
–77
–75
–73
–69
–67
–71
–85
10 100
INPUT FREQUENCY (kHz)
V
DD
= 3.6V
V
DD
= 3V
V
DD
= 2.7V
TEMP = 25°C
V
DD
= 1.8V
V
DD
= 1.6V
V
DD
= 2.2V
02643-012
Figure 11. AD7466 THD vs. Analog Input Frequency
at 100 kSPS for Various Supply Voltages
–76
THD (dB)
–83
–82
–81
–80
–79
–78
–77
–84
10 100
INPUT FREQUENCY (kHz)
R
IN
= 510Ω
R
IN
= 10Ω
TEMP = 25°C
V
DD
= 2.7V
R
IN
= 100Ω
R
IN
= 0Ω
R
IN
= 1kΩ
02643-013
Figure 12. AD7466 THD vs. Analog Input Frequency
for Various Source Impedances
1.0
INL ERROR (LSB)
–0.8
–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
V
DD
= 1.8V
TEMP = 25°C
f
IN
= 50Hz
f
SAMPLE
= 100kSPS
02643-014
Figure 13. AD7466 INL Performance