Datasheet

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SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005
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23
21 Ω
0.1 µF
1 µF
0.1 µF
1 µF
Analog Input
Circuit
21 Ω
+VA
AGND
REFOUT
REFIN
REFM
+IN
−IN
ADS7881
Analog 5 V
AGND
AGND
Figure 38. Using Internal Reference
21 Ω
ADS7881
21 Ω
+IN
−IN
150 pF
12 Ω
_
+
THS4211
604 Ω
130 pF
604 Ω
100 Ω
1 nF
1 kΩ
3 kΩ
2.5 V DC
Signal Input
AGND
AGND
Figure 39. Typical Analog Input Circuit
CS
BYTE
CONVST
DB[11:4]
BUSY
ADS7881Microcontroller
RDRD
INT
P[7:0]
GPIO
GPIO
GPIO
Figure 40. Interfacing With Microcontroller