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LMP7701MA/NOPB Datasheet(PDF) 26 Page - Texas Instruments

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Part # LMP7701MA/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

LMP7701MA/NOPB Datasheet(HTML) 26 Page - Texas Instruments

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eni =
en +
2
ei +
2
et
2
V
-
V
+
VOUT
RO
RG
VIN
RF
V
-
V
+
RO
RG
RF
V
-
V
+
RO
RG
RF
V
-
V
+
RO
RG
RF
+
-
+
-
+
-
+
-
REDUCED INPUT VOLTAGE NOISE =
en1+en2+
2
2
+enN
2
=
1
N
1
N
Nen
2
=
N
N
en
=
1
en
N
LMP7701, LMP7702, LMP7704
SNOSAI9I – SEPTEMBER 2005 – REVISED NOVEMBER 2015
www.ti.com
Application Information (continued)
(6)
Figure 47 shows a schematic of this input voltage noise reduction circuit. Typical resistor values are:
RG = 10Ω, RF = 1 kΩ, and RO = 1 kΩ.
Figure 47. Noise Reduction Circuit
9.1.2 Total Noise Contribution
The LMP770x have very low input bias current, very low input current noise, and very low input voltage noise. As
a result, these amplifiers are ideal choices for circuits with high impedance sensor applications.
Figure 48 shows the typical input noise of the LMP770x as a function of source resistance where:
en denotes the input referred voltage noise
ei is the voltage drop across source resistance due to input referred current noise or ei = RS * in
et shows the thermal noise of the source resistance
eni shows the total noise on the input.
Where:
26
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Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: LMP7701 LMP7702 LMP7704



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