Datasheet

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SBOS279E − SEPTEMBER 2003 − REVISED MAY 2008
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12
ADS7816
12−Bit ADC
DCLOCK
D
OUT
CS/SHDN
OPA373
+5V
V
IN
V+
2
+IN
3
−
IN
V
REF
8
4GND
Serial
Interface
1
0.1
µ
F 0.1
µ
F
7
6
5
NOTE: ADC Input = 0 to V
REF
5k
Ω
5k
Ω
330pF
500k
Ω
3300pF
V
S
2
Figure 9. The OPA373 in Inverting Configuration Driving the ADS7816
NOTE: FilterPro is a low-pass filter design program available for download at
no cost from TI’s web site (www.ti.com). The program can be used to determine
component values for other cutoff frequencies or filter types.
1/2
OPA373
R
1
11.7k
Ω
330pF
C
1
680pF
R
2
2.72k
Ω
1/2
OPA373
C
2
330pF
R
3
21.4k
Ω
C
3
Figure 10. Three-Pole Sallen-Key Butterworth Low-Pass Filter