+5V
+5V
Isolated Power
8
7
REF200
100µA
100µA
0.1µF
DSP
1
2
1
2
3
4
5
6
7
8
AVDD
REFOUT
REFIN
NIC
REFEN 16
MOUT 15
MCLK 14
DVDD 13
DGND 12
CAL 11
MDATA
Opto
+5V
Coupler
1µF
SCLK
SDATA
ADS1201
0.1µF
A
INP
INN
PT100
+5V
A
AGND
VBIAS
GAIN/OFFSET 10
Opto
Coupler
MCLK
12.5kΩ
BIASEN
9
FIGURE 12. PT100 Interface with Current Excitation.
+5V
0.1µF
10kΩ
DSP
1
2
3
4
5
6
7
8
AVDD
REFEN 16
MOUT 15
MCLK 14
DVDD 13
DGND 12
CAL 11
3
2
1/2
OPA2237
1
REFOUT
REFIN
NIC
MDATA
MCLK
0.1µF
SCLK
SDATA
ADS1201
0.1µF
A
A
INP
RG
INN
AGND
VBIAS
GAIN/OFFSET 10
BIASEN
6
5
1/2
OPA2237
7
9
FIGURE 13. Geophone Interface.
®
ADS1201
12
TI [ TEXAS INSTRUMENTS ]
