Datasheet

AD7276/AD7277/AD7278
Rev. C | Page 13 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise noted.
04903-009
FREQUENCY (kHz)
SNR (dB)
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
–120
–20
–100
–80
–60
–40
1500
16,384 POINT FFT
F
SAMPLE
=3MSPS
F
IN
=1MHz
SINAD = 71.2dB
THD = –80.9dB
SFDR = –82.4dB
V
DD
=3V
Figure 10. AD7276 Dynamic Performance at 3 MSPS, Input Tone = 1 MHz
04903-010
FREQUENCY (kHz)
SNR (dB)
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
–110
–
10
–20
–30
–40
–50
–60
–70
–80
–90
–100
1500
16,384 POINT FFT
F
SAMPLE
= 3MSPS
F
IN
=1MHz
SINAD = 61.6dB
THD = –80.2dB
SFDR = –83.4dB
V
DD
=3V
Figure 11. AD7277 Dynamic Performance at 3 MSPS, Input Tone = 1 MHz
04903-012
INPUT FREQUENCY (kHz)
SINAD (dB)
100
67.5
72.5
15001000
72.0
71.5
71.0
70.5
70.0
69.5
69.0
68.5
68.0
V
DD
= 2.35V
V
DD
=3V
V
DD
=3.6V
Figure 12. AD7276 SINAD vs. Analog Input Frequency at 3 MSPS
for Various Supply Voltages, SCLK Frequency = 48 MHz
04903-013
INPUT FREQUENCY (kHz)
SNR (dB)
100
69.0
73.0
15001000
V
DD
= 2.35V
72.5
72.0
71.5
71.0
70.5
70.0
69.5
V
DD
=3.6V
V
DD
=3V
Figure 13. AD7276 SNR vs. Analog Input Frequency at 3 MSPS
for Various Supply Voltages, SCLK Frequency = 48 MHz
04903-016
CODE
NUMBER OF OCCURRENCES
2046
0
30,000
25,000
20,000
15,000
10,000
5,000
2050204920482047
30,000
CODES
Figure 14. Histogram of Codes for 30,000 Samples
04903-017
INPUT FREQUENCY (kHz)
THD (dB)
100
–90
–
72
15001000
–74
–76
–78
–80
–82
–84
–86
–88
V
DD
=3.6V
V
DD
= 2.35V
V
DD
=3V
Figure 15. THD vs. Analog Input Frequency at 3 MSPS
for Various Supply Voltages, SCLK Frequency = 48 MHz