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| SM72501 Datasheet, PDF (21/28 Pages) National Semiconductor (TI) – SolarMagic Precision, CMOS Input, RRIO, Wide Supply Range Amplifier | |||
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www.ti.com
SM72501
SNIS157C â JANUARY 2011 â REVISED APRIL 2013
LM35
pH ELECTRODE TEMPERATURE
75:
1 PF
V+
+
A1
-
R1
10 k:
1
R2
10 k:
V+
V-
V+
R3
10 k:
RT
R4
10 k:
-
A2
+
V+
VOFFSET = 0.5012V V-
-V+
23
R5
R6
10 k:
LM4140A 6
3.3 k:
1,4,7,8
pH ELECTRODE
V+
0.01 PF
0.1 PF
10 PF
0.01 PF
0.1 PF
10 PF
VD+
VA+
VOUT
CH0
CH1
ADC12034
AGND
VREF-
VREF+
DGND
Figure 52. pH Measurement Circuit
Copyright © 2011â2013, Texas Instruments Incorporated
Product Folder Links: SM72501
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