Datasheet

Data Sheet AD7988-1/AD7988-5
Rev. D | Page 11 of 24
CODE
0
16384
32768 49152 65536
1
.
0
0
–1
.0
0
DNL
(LSB)
0
.7
5
0
.5
0
0
.
2
5
–0
.2
5
–
0
.
7
5
0
–
0.
50
P
O
S
I
T
I
VE
I
N
L
:
+
0
.
1
8
L
S
B
NE
G
ATI
VE I
N
L:
–
0.
21
L
S
B
10231-012
Figure 12. Differential Nonlinearity vs. Code, V
REF
= 5 V
CO
DE
0 16384 32768
49152 65536
1.00
–1.00
DNL (LSB)
0.75
0.50
0.25
–0.25
–0.75
0
–0.50
POSITIVE INL: +0.25 LSB
NEGATIVE INL: –0.22 LSB
10231-013
Figure 13. Differential Nonlinearity vs. Code, V
REF
= 2.5 V
180k
0
000 0022
CODE IN HEX
COUNTS
8003 8004 8005 8006 8007 8008 8009
800A 800B 800C 800D 800E 800F
1291
852
29
2
10231-050
160k
140k
120k
100k
80k
60k
40k
20k
52720
162595
42731
Figure 14. Histogram of a DC Input at the Code Center, V
REF
= 5 V
6
0
k
0
0
0
0
0
9
4
30
1
CODE IN HEX
COUNT
S
50k
30k
10k
4
0
k
2
0
k
7FFA 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006
2
29
0
18
8
4
8
50970
45198
1
2
42
4
1217
10231-015
Figure 15. Histogram of a DC Input at the Code Transition, V
REF
= 2.5 V
100
80
85
90
95
REFERENCE VOLTAGE (V)
SNR, SINAD (dB)
16
12
13
14
15
ENOB (Bits)
SNR
SINAD
ENOB
2.25 2.75 3.25 3.75 4.25
4.75 5.25
10231-016
Figure 16. SNR, SINAD, and ENOB vs. Reference Voltage
60k
0
000 0
590
11
19
CODE IN HEX
COUNTS
50k
30k
10k
40k
20k
7FFA 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006
7285
37417
53412
31540
5807
512
10231-051
Figure 17. Histogram of a DC Input at the Code Center, V
REF
= 2.5 V