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Precision Sensing Applications<br />
Bridge Sensors — Pressure, Load, Force<br />
Photoconductive/Photovoltaic<br />
C F<br />
10 V<br />
RG<br />
10 V<br />
+<br />
AMP<br />
-<br />
RF<br />
RF<br />
R A<br />
RB<br />
10 V<br />
-<br />
AMP<br />
+<br />
5V<br />
ADC121S101<br />
VA<br />
CSB<br />
ADC<br />
GND SDATA<br />
VIN<br />
SCLK<br />
5V<br />
2.5V<br />
is biased, provides C D C CM AMP<br />
R F<br />
D PHOTO<br />
Photoconductive diode<br />
faster response<br />
-<br />
+<br />
5V<br />
ADC<br />
CS<br />
SCLK<br />
D OUT<br />
Pressure<br />
Sensor<br />
10 V<br />
-<br />
AMP<br />
+<br />
R A<br />
RB<br />
C F<br />
R F<br />
5V<br />
Photovoltaic more<br />
linear, no leakage<br />
current. Generates<br />
voltage proportional<br />
to light<br />
I IN<br />
C CM<br />
C D<br />
-<br />
AMP<br />
+<br />
ADC<br />
CS<br />
SCLK<br />
DOUT<br />
Solutions Examples Pages<br />
Op amp LMP7704/ 09 43<br />
Single ended input SPI ADC ADC101Sxx1, ADC101C02x 25, 24<br />
Power LM2267x, LM500x, LM284x 114, 118<br />
Solutions Examples Pages<br />
Op amp LMP7701, LMV851, LMP7715, LMV841 44, 46<br />
Single-ended input SPI ADC ADC121Sxx1, ADC121C02x 25, 24<br />
Power LM500x, LM284x 118<br />
Reference LM4132, LM4140 144<br />
Temperature-Thermacouple Interface<br />
Temperature-RTD<br />
Type K<br />
Thermocouple<br />
Temp Sensor<br />
1<br />
5<br />
T CJR<br />
+V<br />
4<br />
Cold Junction<br />
Temperature<br />
V DD<br />
3 V OUT<br />
2<br />
Cold Junction<br />
Reference<br />
Copper<br />
Copper<br />
5K<br />
5K<br />
Av = 200<br />
Full Scale ~ 500 o C<br />
1M<br />
2<br />
3<br />
1M<br />
+V<br />
180Ω<br />
+5<br />
- 7<br />
6<br />
180 Ω<br />
AMP<br />
Amplified<br />
+ 4 Thermocouple<br />
Output<br />
3<br />
470 pF<br />
4<br />
3 REF 6<br />
1,2 7,8<br />
3<br />
470 pF<br />
ADC<br />
1<br />
100 nF<br />
1<br />
4<br />
6<br />
ADC<br />
5<br />
2<br />
2<br />
4<br />
6<br />
5<br />
4.096 V<br />
SCLK<br />
/CS<br />
SDATA<br />
To<br />
μP<br />
SCLK<br />
/CS<br />
SDATA<br />
RTD<br />
5 +<br />
3<br />
1<br />
AMP<br />
4<br />
2<br />
-<br />
R8<br />
2.5K<br />
+V<br />
4<br />
5<br />
Reference<br />
2 +V<br />
3 + 5<br />
AMP 1<br />
4<br />
-<br />
2<br />
+V<br />
3 + 5<br />
AMP<br />
1<br />
4<br />
- 2<br />
R2<br />
10K<br />
R5<br />
10K<br />
R7<br />
3.04K<br />
R6<br />
10K<br />
R4<br />
10K<br />
Av = (1+2R5/R7)(R1/R2)<br />
R1<br />
10K<br />
R3<br />
10K<br />
+V<br />
3 + 5<br />
AMP<br />
4<br />
- 2<br />
1<br />
1 μF<br />
ADC<br />
VA<br />
2 kΩ<br />
LM4040-2.5<br />
Solutions Examples Pages<br />
Op amp LMP7701, LMP7715 44<br />
Single-ended input SPI ADC ADC121x021 24, 25<br />
Temp Sensor LM94022 57<br />
Reference LM4140 144<br />
Solutions Examples Pages<br />
Op amp LMP7704, LMP7716, LMP7731 44, 51<br />
Differential-Input SPI ADC ADC121Sxx5, ADC141626 26<br />
Reference LM4132, LM4040 144<br />
Power LM284x, LM500x 118<br />
6