AD7982 Analog Devices, AD7982 Datasheet - Page 9

• Manufacturer Part Number: AD7982
• Manufacturer: Analog Devices

Specifications of AD7982

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: SOP

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