Datasheet

AD7398/AD7399
Rev. C | Page 12 of 24
02179-016
TIME (100ns/DIV)
CLOCK (5V/DIV)
V
OUT
(50mV/DIV)
100
90
10
0%
Figure 16. AD7398 Digital Feedthrough
02179-017
TIME (5µs/DIV)
CS (5V/DIV)
V
OUT
(2V/DIV)
DLY 54µs
5V 5µs
2v
100
90
10
0%
V
DD
= +5V, V
SS
= –5V, V
REF
= +5V
Figure 17. AD7398 Large Signal Settling Time
02179-018
TIME (2µs/DIV)
V
DD
= +5V, V
SS
= –5V, V
REF
= +5V
V
OUT
(2V/DIV)
DLY 67µsA2 0.8V
5V 2µs
CS (5V/DIV)
2V
100
90
10
0%
Figure 18. AD7398 Shutdown Recovery
100 1M100k
0
–108
–96
–84
–72
–60
–48
–36
–24
–12
10k1k
FREQUENCY (Hz)
ATTENUATION (dB)
02179-019
0x000
0x001
0x002
0x004
0x008
0x010
0x020
0x040
0x080
0x100
0x200
0x400
0x800
0xFFF
V
DD
= +5V
V
SS
= –5V
V
REF
= +100mV rms
T
A
= 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
SUPPLY CURRENT (mA)
CLOCK FREQUENCY (Hz)
02179-020
4
3
T
A
= 25°C
1. V
DD
= +5V, V
SS
= –5V, CODE = 0x000, 0xFFF
3. V
DD
= +5V, V
SS
= –5V, CODE = 0x555
3. V
DD
= +5V, V
SS
= 0V, CODE = 0x000, 0xFFF
4. V
DD
= +5V, V
SS
= 0V, CODE = 0x555
5. V
DD
= +3V, V
SS
= 0V, CODE = 0x000, 0xFFF
6. V
DD
= +3V, V
SS
= 0V, CODE = 0x555
Figure 20. AD7398 Supply Current vs. Clock Frequency
2.00
AD7398
T
A
= 25°C
V
REF
= +2.5V
1.00
1.25
1.50
1.75
2 3 4 5 6
POWER SUPPLY CURRENT (mA)
POWER SUPPLY VOLTAGE (V)
02179-021
DUAL SUPPLY
±3V
±5V
SINGLE SUPPLY
Figure 21. AD7398 Supply Current vs. Supply Voltage
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