AD7634 Analog Devices, AD7634 Datasheet - Page 12

• Manufacturer Part Number: AD7634
• Manufacturer: Analog Devices

Specifications of AD7634

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 670kSPS
• Interface: Byte,Par,Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: 10V p-p,20 V p-p,40 V p-p
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

AD7634
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = DVDD = 5 V; OVDD = 5 V; VCC = 15 V; VEE = −15 V; V
Figure 6. Integral Nonlinearity Distribution, Unipolar 10 V Range
–0.5
–1.0
–1.5
–2.0
–2.5
70000
60000
50000
40000
30000
20000
10000
2.5
2.0
1.5
1.0
0.5
120
100
Figure 5. Integral Nonlinearity vs. Code, Bipolar 10 V Range
80
60
40
20
0
Figure 7. Histogram of 261,120 Conversions of a DC Input
0
–2.0
0
0
1FFFE
0
–1.6
at the Code Center, Bipolar 5 V Range
0
–1.2
65536
20000
25
–0.8
INL DISTRIBUTION (LSB)
1997
(288 Devices)
–0.4
20002
32769
CODE IN HEX
131072
CODE
59925
0
POSITIVE INL = 1.40LSB
NEGATIVE INL = –1.10LSB
20004
34164
0.4
2172
0.8
196608
NEGATIVE INL
POSITIVE INL
20006
20
1.2
σ = 0.80
0
1.6
20008
262144
0
2.0
Rev. A | Page 12 of 32
REF
= 5 V; T
A
= 25°C.
Figure 9. Differential Nonlinearity Distribution, Bipolar 5 V Range
–0.5
–1.0
60000
50000
40000
30000
20000
10000
Figure 8. Differential Nonlinearity vs. Code, Bipolar 10 V Range
2.5
2.0
1.5
1.0
0.5
180
160
140
120
100
Figure 10. Histogram of 261,120 Conversions of a DC Input
80
60
40
20
0
0
–2.0
0
0
1FFFC
0
–1.6
at the Code Transition, Bipolar 5 V Range
0
–1.2
1FFFE
65536
5
–0.8
DNL DISTRIBUTION (LSB)
349
(288 Devices)
–0.4
11838
20000
CODE IN HEX
131072
CODE
54874
0
POSITIVE DNL = 1.28LSB
NEGATIVE DNL = –0.63LSB
20002
56811
0.4
6901
0.8
196608
NEGATIVE DNL
POSITIVE DNL
20004
294
1.2
σ = 0.75
0
1.6
20006
262144
0
2.0