Datasheet

AD7298-1
Rev. A | Page 10 of 24
1.0
1.5
2.0
2.5
3.0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
CURRE
NT LOAD (mA)
V
REF
(V)
V
DD
= V
DRIVE
= 3V
09321-109
Figure 9. V
REF
vs. Reference Output Current Drive
–110
–108
–106
–104
–102
–100
–98
–96
–94
–92
–90
1k 10k 100k 1M 10M 100M
PSRR (dB)
RIPPLE FREQUENCY (Hz)
V
DD
= 3V
V
DRIVE
= 3V
09321-110
Figure 10. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
70
75
80
85
90
95
100
105
110
0 50 100 150 200 250 300 350 400 450 500 550
ISOLATION (dB)
f
NOISE
(kHz)
09321-111
Figure 11. Channel-to-Channel Isolation, f
IN
= 50 kHz
58.0
58.5
59.0
59.5
60.0
60.5
61.0
61.5
62.0
10 100
SINAD (dB)
INPUT FREQUENCY (kHz)
V
DD
= 3V
V
DRIVE
= 3V
R
SOURCE
= 0Ω
R
SOURCE
= 10Ω
R
SOURCE
= 33Ω
R
SOURCE
= 47Ω
R
SOURCE
= 100Ω
R
SOURCE
= 200Ω
09321-046
Figure 12. SINAD vs. Analog Input Frequency for Various Source Impedances
60.50
60.75
61.00
61.25
61.50
61.75
62.00
1.0 1.5 2.0 2.5
SINAD (dB)
EXTERNAL REFERENCE VOLTAGE (V)
V
DD
= 3V
V
DRIVE
= 3V
09321-043
Figure 13. SINAD vs. Reference Voltage
–90
–89
–88
–87
–86
–85
–84
–83
–82
–81
–80
1.0 1.5 2.0 2.5
THD (dB)
EXTERNAL REFERENCE VOLTAGE (V)
V
DD
= 3V
V
DRIVE
= 3V
09321-044
Figure 14. THD vs. Reference Voltage