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CLC2057 View Datasheet(PDF) - Cadeka Microcircuits LLC.

Part NameDescriptionManufacturer
CLC2057 Dual, Low Noise, Operational Amplifier CADIEKA
Cadeka Microcircuits LLC.  CADIEKA
CLC2057 Datasheet PDF : 13 Pages
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Data Sheet
Application Information
Basic Operation
Figures 1 and 2 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.
+Vs
6.8μF
Input
+
0.1μF
-
0.1μF
Rg
6.8μF
-Vs
Output
RL
Rf
G = 1 + (Rf/Rg)
Figure 1. Typical Non-Inverting Gain Circuit
+Vs
6.8μF
Input
R1
+
Rg
-
0.1μF
0.1μF
Rf
Output
RL
6.8μF
-Vs
G = - (Rf/Rg)
For optimum input offset
voltage set R1 = Rf || Rg
Figure 2. Typical Inverting Gain Circuit
+Vs
6.8μF
Input
+
0.1μF
-
0.1μF
Output
RL
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 purpos-
es however, prior knowledge of actual signal levels and
load impedance is needed to determine the dissipated
power. Here, PD can be found from
6.8μF
-Vs
G=1
Figure 3. Unity Gain Circuit
PD = PQuiescent + PDynamic - PLoad
Quiescent power can be derived from the specified IS val-
ues along with known supply voltage, VSupply. Load power
©2007-2009 CADEKA Microcircuits LLC
www.cadeka.com 9
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