Datasheet

AD7398/AD7399
Rev. C | Page 11 of 24
1.00
–1.00
–0.75
–0.50
–0.25
0
0.25
0.50
0.75
–5 –4 –3 –2 –1 0 1 2 3 4 5
INL, DNL, FSE (LSB)
REFERENCE VOLTAGE (V)
02179-010
INL
DNL
FSE
AD7398
T
A
= 25°C
V
DD
= +5V
V
SS
= –5V
Figure 10. AD7398 INL, DNL, FSE vs. Reference Voltage
100
90
80
70
60
50
40
30
20
10
0
0 4096358430722560204815361024512
REFERENCE INPUT CURRENT (µA)
CODE (Decimal)
02179-011
AD7398
V
DD
= +5V
V
SS
= –5V
V
REF
= +2.5V
T
A
= 25°C
Figure 11. AD7398 Reference Input Current vs. Code
1000
100
10
0 4096358430722560204815361024512
REFERENCE INPUT RESISTANCE (kΩ)
CODE (Decimal)
02179-012
AD7398
V
DD
= +5V
V
SS
= –5V
T
A
= 25°C
Figure 12. AD7398 Reference Input Resistance vs. Code
10
–10
–8
–6
–4
–2
0
2
4
6
8
–20 20151050–5–15–15
ΔV
OUT
(mV)
SOURCE OR SINK CURRENT FROM V
OUT
(mA)
02179-013
AD7398/AD7399
T
A
= 25°C
SINKING CURRENT INTO V
OUT
V
DD
= +3V, V
SS
= 0V
V
DD
= +5V, V
SS
= –5V
V
DD
= +5V, V
SS
= 0V
SOURCING CURRENT FROM V
OUT
V
DD
= +5V, V
SS
= –5V
V
DD
= +5V, V
SS
= 0V
V
DD
= +3V, V
SS
= 0V
Figure 13. ΔV
OUT
vs. Load Current
25
20
15
10
5
0
0.4 2.62.42.22.01.81.61.41.21.00.80.6
COUNTS
FULL-SCALE ERROR TEMPCO (ppm/°C)
02179-014
AD7398
SAMPLE SIZE = 125
–40°C TO +125°C
Figure 14. AD7398 Full-Scale Error Tempco
TIME (2µs/DIV)
V
OUT
(0.2V/DIV)
CS (5V/DIV)
02179-015
100
90
10
0%
Figure 15. AD7398 Midscale Glitch