Datasheet

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APPLICATION CIRCUITS
+IN
ADS8325
100pF
50W
-IN
0.1mF
5W
CS
D
OUT
DCLOCK
4.7mF
IN
GND
OUT
0.47mF
REF
V
DD
REF5025
AV
DD
2.7Vto5V
DV
DD
2.7Vto3.6V
V
CM
+(0Vto2.5V)
GND GND
DSP
TMS320C6xx
or
TMS320C5xx
or
TMS320C2xx
0.1mF 10mF
10mF
+
+
OPA365
100pF
50W
V
CM
OPA365
1nF
+IN
ADS8325
100pF
50W
-IN
0.1mF
5W
CS
D
OUT
DCLOCK
4.7mF
IN
GND
OUT
0.47mF
REF
V
DD
REF5040
AV
DD
4.3Vto5.5V
DV
DD
4.5Vto5.5V
0Vto4.096V
GND GND
Microcontroller
or
DSP
0.1mF 10mF
10mF
+
+
OPA365
ADS8325
SBAS226C – MARCH 2002 – REVISED AUGUST 2007
high-frequency noise from the supply itself. The exact
values should be picked such that the filter provides
Figure 39 shows a basic data acquisition system. The
adequate rejection of noise. Operational amplifiers
ADS8325 input range is connected to 2.5V or 4.096V.
and voltage reference are connected to analog power
The 5 Ω resistor and 1 μ F to 10 μ F capacitor filters the
supply, AV
DD
.
microcontroller noise on the supply, as well as any
Figure 39. Two Examples of a Basic Data Acquisition System
Copyright © 2002 – 2007, Texas Instruments Incorporated Submit Documentation Feedback 23
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