Datasheet

Data Sheet AD7982
Rev. B | Page 9 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V, REF = 5.0 V, V IO = 3.3 V.
06513-006
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
INL (LSB)
0 65536 131072 196608 262144
CODE
POSITIVE INL: +0.79 LSB
NEGATIVE INL: –0.68 LSB
Figure 6. Integral Nonlinearity vs. Code
60000
50000
40000
30000
20000
10000
0
COUNTS
3FFF0 3FFF2 3FFF4 3FFF6 3FFF8 3FFFA 3FFFC
CODE IN HEX
0 0
29
745
881
43
0
06513-007
0
7795
29064
50975
32476
9064
Figure 7. Histogram of a DC Input at the Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0 100 200
300
400 500
FREQUENCY (kHz)
AMPLITUDE (dB OF FULL SCALE)
06513-008
f
S
= 1MSPS
f
IN
= 2kHz
SNR = 97.3dB
THD = –121.8dB
SFDR = 120.2dB
SINAD = 97.3dB
Figure 8. FFT Plot
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0 65536
131072 196608
262144
CODE
DNL (LSB)
06513-009
POSITIVE INL: +0.46 LSB
NEGATIVE INL: –0.49 LSB
Figure 9. Differential Nonlinearity vs. Code
50000
45000
40000
35000
30000
25000
0
COUNTS
0
1 2 3
4 5
6 7 8 9 A D
CODE IN HEX
0
0
7
145
7 0
0
06513-010
20000
15000
10000
5000
222
CB
16682
44806
43239
20013
3158
2793
Figure 10. Histogram of a DC Input at the Code Transition
100
99
98
97
96
95
94
93
92
91
90
–10
–9 –8
–7 –6
–5 –4 –3
–2
–1 0
INPUT LEVEL (dB)
SNR (dB REFERRED TO FULL SCALE)
06513-032
Figure 11. SNR vs. Input Level