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LMP7704MT/NOPB Datasheet(PDF) 27 Page - Texas Instruments

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Part # LMP7704MT/NOPB
Description  Precision, CMOS Input, RRIO, Wide Supply Range Amplifiers
PDF  44 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMP7704MT/NOPB Datasheet(HTML) 27 Page - Texas Instruments

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A1
V
+
1
LM35
V
+
pH ELECTRODE
pH ELECTRODE TEMPERATURE
R3
10 k:
R4
10 k:
+
-
A2
V
+
R1
10 k:
R2
10 k:
V
-
V
-
+
-
ADC12034
0.01 PF
0.1 PF
10 PF
VD
+
CH0
CH1
VREF-
VREF+
DGND
0.01 PF
10 PF
AGND
VOUT
VA
+
V
+
V
+
LM4140A
6
2
1,4,7,8
3
R5
10 k:
R6
3.3 k:
VOFFSET = 0.5012V
0.1 PF
RT
-V
+
1 PF
75:
10
1k
100k
10M
RS (:)
0.1
1
10
1000
1M
10k
100
100
eni
en
ei
et
LMP7701, LMP7702, LMP7704
www.ti.com
SNOSAI9I – SEPTEMBER 2005 – REVISED NOVEMBER 2015
Application Information (continued)
The input current noise of the LMP770x is so low that it will not become the dominant factor in the total noise
unless source resistance exceeds 300 M
Ω, which is an unrealistically high value.
As is evident in Figure 48, at lower RS values, total noise is dominated by the amplifier's input voltage noise.
Once RS is larger than a few kilo-Ohms, then the dominant noise factor becomes the thermal noise of RS. As
mentioned before, the current noise will not be the dominant noise factor for any practical application.
Figure 48. Total Input Noise
9.2 Typical Application
Figure 49. pH Measurement Circuit
Copyright © 2005–2015, Texas Instruments Incorporated
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Product Folder Links: LMP7701 LMP7702 LMP7704



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