AD7398/AD7399
Rev. C | Page 12 of 24
02179-
016
TIME (100ns/DIV)
CLOCK (5V/DIV)
VOUT (50mV/DIV)
100
90
10
0%
Figure 16. AD7398 Digital Feedthrough
02179-
017
TIME (5s/DIV)
CS (5V/DIV)
VOUT (2V/DIV)
DLY 54s
5V
5s
2v
100
90
10
0%
VDD = +5V, VSS = –5V, VREF = +5V
Figure 17. AD7398 Large Signal Settling Time
02179-
018
TIME (2s/DIV)
VDD = +5V, VSS = –5V, VREF = +5V
VOUT (2V/DIV)
DLY 67s
A2
0.8V
5V
2s
CS (5V/DIV)
2V
100
90
10
0%
Figure 18. AD7398 Shutdown Recovery
100
1M
100k
0
–108
–96
–84
–72
–60
–48
–36
–24
–12
10k
1k
FREQUENCY (Hz)
AT
T
E
NUAT
IO
N
(
d
B)
02179-
019
0x000
0x001
0x002
0x004
0x008
0x010
0x020
0x040
0x080
0x100
0x200
0x400
0x800
0xFFF
VDD = +5V
VSS = –5V
VREF = +100mV rms
TA = 25°C
Figure 19. AD7398 Multiplying Gain vs. Frequency
5
2
1
6
5
0
1
2
3
4
1k
10k
100k
1M
10M
100M
S
UP
P
L
Y
CURRE
NT
(
mA)
CLOCK FREQUENCY (Hz)
02179-
020
4
3
TA = 25°C
1. VDD = +5V, VSS = –5V, CODE = 0x000, 0xFFF
3. VDD = +5V, VSS = –5V, CODE = 0x555
3. VDD = +5V, VSS = 0V, CODE = 0x000, 0xFFF
4. VDD = +5V, VSS = 0V, CODE = 0x555
5. VDD = +3V, VSS = 0V, CODE = 0x000, 0xFFF
6. VDD = +3V, VSS = 0V, CODE = 0x555
Figure 20. AD7398 Supply Current vs. Clock Frequency
2.00
AD7398
TA = 25°C
VREF = +2.5V
1.00
1.25
1.50
1.75
2
3
4
5
6
P
O
W
E
R
S
UP
P
L
Y
CURRE
NT
(
mA)
POWER SUPPLY VOLTAGE (V)
02179-
021
DUAL SUPPLY
±3V
±5V
SINGLE SUPPLY
Figure 21. AD7398 Supply Current vs. Supply Voltage