Datasheet

AD7927 Data Sheet
Rev. D | Page 10 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
FREQUENCY (kHz)
0
SNR (dB)
–90
100
–50
–70
80604020
–10
–30
–110
10 30 50 70 90
4096 POINT FFT
AV
DD
= 4.75V
f
SAMPLE
= 200kSPS
f
IN
= 50kHz
SINAD = 70.714dB
THD = –82.853dB
SFDR = –84.815dB
03088-004
Figure 4. Dynamic Performance at 200 kSPS
INPUT FREQUENCY (kHz)
75
0100
SINAD (dB)
70
65
60
AV
DD
=V
DRIVE
= 5.25V
AV
DD
=V
DRIVE
= 4.75V
AV
DD
=V
DRIVE
= 3.6V
AV
DD
=V
DRIVE
= 2.7V
f
SAMPLE
= 200kSPS
T
A
= 25°C
RANGE = 0 TO REF
IN
03088-005
Figure 5. SINAD vs. Analog Input Frequency for Various Supply Voltages
at 200 kSPS
SUPPLY RIPPLE FREQUENCY (kHz)
0
0 200
PSRR (dB)
–40
–60
–80
–90
100
–20
–50
–70
18016014012080604020
–10
–30
AV
DD
= 5V
200mV p-p SINE WAVE ON AV
DD
REF
IN
= 2.5V, 1µF CAPACITOR
T
A
= 25°C
03088-006
Figure 6. PSRR vs. Supply Ripple Frequency
INPUT FREQUENCY (kHz)
–
50
00101
THD (dB)
–65
–75
–85
–90
–55
–70
–80
–60
f
SAMPLE
= 200kSPS
T
A
= 25°C
RANGE = 0 TO REF
IN
03088-007
AV
DD
=V
DRIVE
= 5.25V
AV
DD
=V
DRIVE
= 4.75V
AV
DD
=V
DRIVE
= 2.7V
AV
DD
=V
DRIVE
= 3.6V
Figure 7. THD vs. Analog Input Frequency for Various Supply Voltages
at 200 kSPS