Datasheet

AD7643
Rev. 0 | Page 12 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
3.0
–3.0
0 262144
CODE
INL (LSB)
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
65536 131072 196608
06024-005
Figure 5. Integral Nonlinearity vs. Code
40000
0
1FFEE
1FFEF
1FFF0 1FFF1 1FFF2 1FFF3 1FFF4 1FFF5 1FFF6 1FFF7 1FFF8 1FFF9
1FFFA
1FFFB 1FFFC 1FFFD
1FFFE
1FFFF
CODE IN HEX
COUNTS
06024-006
35000
30000
25000
20000
15000
10000
5000
σ = 1.67
V
REF
= 2.5V
013
16
30
228
59
33606
26875
23521
17320
4848
3062
13376
6371
1295
488
Figure 6. Histogram of 131,072 Conversions of a DC Input at
the Code Center (External Reference)
2.0486
2.0484
2.0482
2.0480
2.0478
2.0476
2.0474
2.0472
2.0470
–55 125105856545255–15–35
TEMPERATURE (°C)
V
REF
(V)
06024-007
Figure 7. Typical Reference Voltage Output vs. Temperature (2 Units)
1.25
–1.0
0 262144
CODE
DNL (LSB)
0.5
65536 131072 196608
1.0
0
–0.5
06024-008
Figure 8. Differential Nonlinearity vs. Code
35000
0
20027 20028 20029
2002A
2002B 2002C 2002D
2002E
2002F
20030 20031 20032 20033 20034 20035 20036 20037 20038
CODE IN HEX
COUNTS
06024-009
30000
25000
20000
15000
10000
5000
21 28
305
665
297
108
32
4726
5401
15505
18613
28621
24350
16141
3807
10173
2306
σ = 2.04
V
REF
= 2.048V
Figure 9. Histogram of 131,072 Conversions of a DC Input at
the Code Center (Internal Reference)
12
–12
–10
–8
–6
–4
–2
0
2
4
6
8
10
–55 125105856545255–15–35
TEMPERATURE (°C)
ZERO ERROR, GAIN ERROR (LSB)
06024-010
GAIN ERROR
ZERO ERROR
Figure 10. Zero Error, Gain Error vs. Temperature