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SBOS099C − SEPTEMBER 2000 − REVISED JANUARY 2005
CB1
+5V
Ω
2k
Ω
Ω
Ω
2k
2
3
4
1/ 4
1
OPA4350
VIN B1
µ
µ
0.1 F
0.1 F
CB0
24
+VD
13
+VA
Ω
2k
2k
2
3
23
22
21
20
19
18
17
16
15
14
CH B1+
SERIAL DATA A
SERIAL DATA B
BUSY
−
6
CH B1
7
4
1/ 4
CH B0+
OPA4350
5
5
VIN B0
−
CH B0
CLOCK
6
CA1
CH A1+
CS
Serial
Interface
7
ADS7861
−
CH A1
RD
CONVST
A0
Ω
2k
2k
8
CH A0+
9
−
CH A0
9
10
11
8
1/ 4
REFIN
M0
OPA4350
10
VIN A1
REFOUT
M1
CA0
DGND
AGND
12
1
Ω
2k
Ω
2k
12
13
14
1/ 4
OPA4350
VIN A0
11
VIN = 0V to 2.45V for 0V to 4.9V output.
Choose CB1, CB0, CA1, CA0 to filter high frequency noise.
Figure 5. OPA4350 Driving Sampling A/D Converter
12