
AD7631
Data Sheet
Rev. B | Page 12 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = DVDD = 5 V; OVDD = 5 V; VCC = 15 V; VEE = 15 V; VREF = 5 V; TA = 25°C.
06
58
8-
0
05
CODE
IN
L
(
L
S
B
)
2.5
2.0
1.5
1.0
0.5
0
–2.5
–2.0
–1.5
–1.0
–0.5
65536
0
131072
196608
262144
POSITIVE INL = 1.15 LSB
NEGATIVE INL = –0.94 LSB
fS = 250kSPS
Figure 5. Integral Nonlinearity vs. Code, Bipolar 10 V Range
06
58
8-
0
06
INL DISTRIBUTION (LSB)
NUM
BE
R
O
F
UNI
T
S
0
10
20
30
40
50
60
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4
0.8
1.2
1.6
2.0
NEGATIVE INL
POSITIVE INL
Figure 6. Integral Nonlinearity Distribution, Unipolar 10 V Range
(86 Devices)
70000
0
1FFFE
20008
CO
UNT
S
CODE IN HEX
20000
20002
20004
20006
60000
50000
40000
20000
30000
10000
06
58
8-
0
07
σ = 0.80
00
25
34164
2172
20
00
1997
32769
59925
Figure 7. Histogram of 261,120 Conversions of a DC Input
at the Code Center, Bipolar 5 V Range
06
58
8-
0
08
CODE
DN
L
(
L
S
B
)
2.5
2.0
1.5
1.0
0.5
0
–2.5
–2.0
–1.5
–1.0
–0.5
65536
0
131072
196608
262144
POSITIVE DNL = 0.68 LSB
NEGATIVE DNL = –0.75 LSB
fS = 250kSPS
Figure 8. Differential Nonlinearity vs. Code, Bipolar 10 V Range
06
58
8-
0
09
DNL DISTRIBUTION (LSB)
NU
M
BE
R
O
F
U
NI
T
S
0
10
20
30
40
50
60
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4
0.8
1.2
1.6
2.0
NEGATIVE DNL
POSITIVE DNL
Figure 9. Differential Nonlinearity Distribution, Bipolar 5 V Range
(86 Devices)
CO
UNT
S
CODE IN HEX
20006
1FFFC
1FFFE
20000
20002
20004
60000
0
50000
40000
30000
20000
10000
06
58
8-
0
10
00
σ = 0.75
56811
54874
005
6901
294
349
11838
Figure 10. Histogram of 261,120 Conversions of a DC Input
at the Code Transition, Bipolar 5 V Range