Datasheet

AD7679
Rev. A | Page 12 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
CODE
2.5
0 65536 131072 196608 262144
INL-LSB (18-Bit)
1.5
1.0
0
–2.5
0.5
–0.5
03085-0-005
–1.0
2.0
–2.0
–1.5
Figure 5. Integral Nonlinearity vs. Code
CODE IN HEX
70000
COUNTS
50000
30000
0
20000
10000
40000
1FEBE1FEBD 1FEC0 1FEC1 1FEC2 1FEC3 1FEC4 1FEC51FEC6
V
REF
= 5V
60000
0000
03085-0-006
73
7584
58510
59001
4616
264
Figure 6. Histogram of 131,072 Conversions of a
DC Input at the Code Transition
POSITIVE INL (LSB)
100
0
NUMBER OF UNITS
60
20
0
40
80
0.5 1.0 1.5 2.0
03085-0-007
2.5
Figure 7. Typical Positive INL Distribution (424 Units)
CODE
2.0
0 65536 131072 196608 26214
4
DNL-LSB (18-Bit)
1.5
1.0
0
–1.0
0.5
–0.5
03085-0-008
Figure 8. Differential Nonlinearity vs. Code
CODE IN HEX
90000
COUNTS
60000
40000
20000
0
30000
10000
50000
1FEBF1FEBE 1FEC0 1FEC1 1FEC2 1FEC3 1FEC4 1FEC51FEC6
V
REF
= 5V
70000
80000
05979920
22496
23080
3838
03085-0-009
Figure 9. Histogram of 131,072 Conversions of a
DC Input at the Code Center
NEGATIVE INL (LSB)
120
–2.5
NUMBER OF UNITS
80
60
20
0
–2.0 –1.5 –1.0 –0.5
03085-0-010
100
40
0
Figure 10. Typical Negative INL Distribution (424 Units)