Datasheet

AD7396/AD7397
–7–REV. 0
CODE – Decimal
1.5
0
INL – LSB
1.0
0.5
0.0
–0.5
–1.0
–1.5
512 1024 1536 2048 2560 3072 3584 4096
V
DD
= +3V
V
REF
= +2.5V
T
A
= +258C, +858C
T
A
= –558C
AD7396
Figure 4. AD7396 INL vs. Code and
Temperature
CODE – Decimal
1.0
0
DNL – LSB
0.8
0.6
0.4
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
128 256 384 512 640 768 896 1024
V
DD
= +2.7V
V
REF
= +2.5V
T
A
= +258C, +858C, –558C
SUPERIMPOSED
AD7397
Figure 7. AD7397 DNL vs. Code and
Temperature
V
REF
– Volts
INL – LSB
1.5
0
1.0
0.5
0
–0.5
–1.0
–1.5
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
DD
= +5V
T
A
= +258C
CODE = HALF SCALE
Figure 10. INL Error vs. Reference
Voltage
Typical Performance Characteristics–
CODE – Decimal
1.0
0
INL – LSB
0.8
0.6
0.4
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
128 256 384 512 640 768 896 1024
T
A
= +258C, +858C
T
A
= –558C
V
DD
= +2.7V
V
REF
= +2.5V
AD7397
Figure 5. AD7397 INL vs. Code and
Temperature
FULL-SCALE OUTPUT TEMPCO
HISTOGRAM –
pp
m/8C
60
–55
FREQUENCY
–50 –45 –40
40
20
0
–35 –30
SS = 200 UNITS
V
DD
= +2.7V
V
REF
= +2.5V
T
A
= –408C TO +858C
AD7396
Figure 8. AD7396 Full-Scale Tempco
Histogram
V
REF
– V
FSE – mV
40
20
–40
01 5
23 4
0
–20
40
20
0
–20
–40
FSE – LSB
V
DD
= +5V
T
A
= +258C
FSE (LSB) = FSE (V) 3 4096/V
REF
(V)
AD7396
Figure 11. Full-Scale Error vs. Refer-
ence Voltage
TOTAL UNADJUSTED ERROR
HISTOGRAM – LSB
30
–5
FREQUENCY
0
510
20
10
0
SS = 200 UNITS
T
A
= +258C
V
DD
= +2.7V
V
REF
= +2.5V
AD7397
Figure 6. AD7397 TUE Histogram
SS = 200 UNITS
V
DD
= +2.7V
V
REF
= +2.5V
T
A
= –408C TO +858C
FULL-SCALE TEMPCO – ppm/8C
FREQUENCY
100
40
20
0
–70 –60 –50 –40
–30
AD7397
60
80
Figure 9. AD7397 Full-Scale Tempco
Histogram
FREQUENCY – Hz
OUTPUT NOISE DENSITY – mV/ Hz
10
1
8
6
4
2
0
10 100 1k 10k 100k
V
DD
= +5V
V
REF
= +2.5V
T
A
= +258C
Figure 12. Output Noise Voltage
Density vs. Frequency