Datasheet

REV. A
–7–
AD7390/AD7391
V
OUT
– V
I
OUT
– mA
40
30
0
01 5
23 4
20
10
V
DD
= 5V
V
REF
= 3V
CODE = ØØØ
H
TPC 10. I
OUT
at Zero Scale vs. V
OUT
100  s
1V
TIME – 100s/DIV
V
OUT
(1V/DIV)
LD
(5V/DIV)
V
DD
= 5V
V
REF
= 2.5V
f
CLK
= 50kHz
TPC 13. AD7390 Large Signal
Settling Time
HOURS OF OPERATION AT 150C
NOMINAL CHANGE IN VOLTAGE – mV
1.2
0.0
0 100 600
200 300 400 500
1.0
0.8
0.6
0.4
0.2
SAMPLE SIZE = 50
CODE = FFF
H
CODE = 000
H
TPC 16. AD7390 Long-Term Drift
Accelerated by Burn-In
2  s
20mV
V
DD
= 5V
V
REF
= 2.5V
f
CLK
= 50kHz
CODE: 7F
H
to 80
H
TIME – 2s/DIV
V
OUT
(5mV/DIV)
LD
(5V/DIV)
TPC 11. AD7390 Midscale Transi-
tion Performance
FREQUENCY – Hz
GAIN – dB
100 1k 100k10k
0
–5
V
DD
= 5V
V
REF
= 50mV  2V dc
DATA = FFF
H
5
10
–10
–15
–20
–25
–30
–35
–40
TPC 14. AD7390 Gain vs.
Frequency
5  s
5mV
V
DD
= 5V
V
REF
= 2.5V
f
CLK
= 50kHz
LD = HIGH
TIME – 5s/DIV
V
OUT
(5mV/DIV)
CLK
(5V/DIV)
TPC 12. Digital Feedthrough
REFERENCE VOLTAGE – V
05
1324
INTEGRAL NONLINEARITY – LSB
2.0
1.8
0.0
0.8
0.6
0.4
0.2
1.6
1.0
1.2
1.4
V
DD
= 5V
CODE = 768
H
T
A
= 25C
TPC 15. AD7390 INL Error vs.
Reference Voltage