Datasheet

REV. A
AD7390/AD7391–Typical Performance Characteristics
–6–
TOTAL UNADJUSTED ERROR – LSB
FREQUENCY
25
0
5.0
10
5
20
15
5.8 6.6 7.3 8.1 8.9 9.7 10.5 11.2 12.0
SS = 100 UNITS
T
A
= 25C
V
DD
= 2.7V
V
REF
= 2.5V
TPC 1. AD7390 Total Unadjusted
Error Histogram
FREQUENCY – Hz
OUTPUT VOLTAGE NOISE – V
Hz
10
8
0
1 10 100k
100 1k 10k
6
4
2
12
14
16
V
DD
= 5V
V
REF
= 2.5V
T
A
= 25C
TPC 4. AD7390 Voltage Noise
Density vs. Frequency
TEMPERATURE – C
SUPPLY CURRENT – A
100
20
55 35 125
15 5 25 65 85 10545
90
60
50
40
30
80
70
SAMPLE SIZE = 300 UNITS
V
DD
= 5.0V, V
LOGIC
= 0V
V
DD
= 3.0V, V
LOGIC
= 0V
V
DD
= 3.6V, V
LOGIC
= 2.4V
TPC 7. AD7390 Supply Current
vs. Temperature
TOTAL UNADJUSTED ERROR – LSB
FREQUENCY
100
0
–10
40
20
80
60
–3.3 3.3 10 16 23 30 36 43 50
SS = 300 UNITS
T
A
= 25C
V
DD
= 2.7V
V
REF
= 2.5V
90
70
50
30
10
TPC 2. AD7391 Total Unadjusted
Error Histogram
V
IN
– V
0.0 0.5 3.0
1.0 1.5 2.0 2.5
SUPPLY CURRENT – A
100
95
50
70
65
60
55
90
75
80
85
V
LOGIC
FROM
3.0V TO 0V
V
LOGIC
FROM
0V TO 3.0V
T
A
= 25C
V
DD
= 3.0V
TPC 5. AD7390 Supply Current vs.
Logic Input Voltage
CLOCK FREQUENCY – Hz
SUPPLY CURRENT – A
1000
800
0
1k 10k 10M
100k 1M
600
400
200
a. V
DD
= 5.5V, CODE = 155
H
b. V
DD
= 5.5V, CODE = 3FF
H
c. V
DD
= 2.7V, CODE = 155
H
d
. V
DD
= 2.7V, CODE = 355
H
a
b
c
d
V
LOGIC
= 0V TO V
DD
TO 0V
V
REF
= 2.5V
T
A
= 25C
TPC 8. AD7391 Supply Current
vs. Clock Frequency
FULL-SCALE TEMPCO – ppm/ C
FREQUENCY
0
–33
12
6
24
18
–30 –26 –23 –20 –16 –13 –10 –6 –3
30
0
SS = 100 UNITS
T
A
= 40C TO +85C
V
DD
= 2.7V
V
REF
= 2.5V
TPC 3. AD7391 Full-Scale Output
Tempco Histogram
SUPPLY VOLTAGE – V
12 7
34 56
THRESHOLD VOLTAGE – V
5.0
4.5
0.0
2.0
1.5
1.0
0.5
4.0
2.5
3.0
3.5
V
LOGIC
FROM
HIGH TO LOW
V
LOGIC
FROM
LOW TO HIGH
CODE = FFF
H
V
REF
= 2V
RS LOGIC VOLTAGE
VARIED
TPC 6. AD7390 Logic Threshold
vs. Supply Voltage
FREQUENCY – Hz
PSRR – dB
60
50
0
10 100 10k
1k
30
20
10
40
V
DD
= 3V  5%
V
DD
= 5V  5%
T
A
= 25C
TPC 9. Power Supply Rejection
vs. Frequency