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Philips Semiconductors Application note
AN1651Using the NE/SA5234 amplifier
1991 Oct
10
+
–
10k
4
11
R
S
V
CC
2
RR
R1
R
F
C1
CC
V
CC
SL00643
Figure 15. Non-Inverting Biasing
NE/SA5234
–
+
A1
R
SH
= 250Ω
RECEIVE UNIT
T
R
A
N
S
4700Ω
+
–
A2
SL00644
Figure 16. A 4-20mA Current Loop
+
–
4
11
V
O
1
3
2
1.2M
V2
4.3k
12k
12k
+5.0V
1.2MΩ
4.3k
4.3k
1k
|V
2
– V
1
| V
O
5.9mV
25.6mV
46.6mV
0.5V
2.50V
4.63V
4.3k
S.G. S.G.
+5.0V
S.G.: Matched Strain Gauge elements
SL00645
Figure 17. Strain Gauge Amplifier
+
–
4
11
1
3
2
4.3k
12kΩ
+V
CC
1.2MΩ
4.3k
4.3k
4.3k
SIGNAL
COM
S.G. S.G.
12kΩ
Two-wire, Twisted-pair
Shielded Line
1.2M
SL00646
Figure 18. Remote Strain Gauge
CMOS
+3V
4-6V DC
+
–
+
–
4V
VR
+
–
SL00647
Figure 19. Solar Regulator