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LM324 データシート(PDF) 10 Page - Cadeka Microcircuits LLC.

部品番号 LM324
部品情報  Low Power, 3V to 36V, Single/Dual/Quad Amplifiers
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メーカー  CADEKA [Cadeka Microcircuits LLC.]
ホームページ  http://www.cadeka.com
Logo CADEKA - Cadeka Microcircuits LLC.

LM324 データシート(HTML) 10 Page - Cadeka Microcircuits LLC.

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Data Sheet
©2011 CADEKA Microcircuits LLC
www.cadeka.com
10
Application Information
Basic Operation
Figures 1, 2, and 3 illustrate typical circuit configurations for
non-inverting, inverting, and unity gain topologies for dual
supply applications. They show the recommended bypass
capacitor values and overall closed loop gain equations.
+
-
Rf
0.1μF
6.8μF
Output
G = 1 + (Rf/Rg)
Input
+Vs
-Vs
Rg
0.1μF
6.8μF
RL
Figure 1. Typical Non-Inverting Gain Circuit
Figure 2. Typical Inverting Gain Circuit
+
-
0.1μF
6.8μF
Output
G = 1
Input
+Vs
-Vs
0.1μF
6.8μF
RL
Figure 3. Unity Gain Circuit
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 2k ohm load condition. However, ap-
plications with low impedance, DC coupled loads should
be analyzed to ensure that maximum allowed junction
temperature is not exceeded. Guidelines listed below can
be used to verify that the particular application will not
cause the device to operate beyond it’s intended operat-
ing range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction tem-
perature, the package thermal resistance value ThetaJA
JA) is used along with the total die power dissipation.
TJunction = TAmbient + (ӨJA × PD)
Where TAmbient is the temperature of the working environment.
In order to determine PD, the power dissipated in the load
needs to be subtracted from the total power delivered by
the supplies.
PD = Psupply - Pload
Supply power is calculated by the standard power equa-
tion.
Psupply = Vsupply × IRMS supply
Vsupply = VS+ - VS-
Power delivered to a purely resistive load is:
Pload = ((VLOAD)RMS2)/Rloadeff
The effective load resistor (Rloadeff) will need to include
the effect of the feedback network. For instance,
Rloadeff in figure 3 would be calculated as:
RL || (Rf + Rg)
These measurements are basic and are relatively easy to
perform with standard lab equipment. For design purposes
however, prior knowledge of actual signal levels and load
impedance is needed to determine the dissipated power.
Here, PD can be found from
PD = PQuiescent + PDynamic - PLoad
Quiescent power can be derived from the specified IS val-
ues along with known supply voltage, VSupply. Load power
can be calculated as above with the desired signal ampli-
tudes using:
+
-
Rf
0.1μF
6.8μF
Output
G = - (Rf/Rg)
For optimum input offset
voltage set R1 = Rf || Rg
Input
+Vs
-Vs
0.1μF
6.8μF
RL
Rg
R1


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