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CLC1011 View Datasheet(PDF) - Cadeka Microcircuits LLC.

Part NameCLC1011 CADEKA
Cadeka Microcircuits LLC. CADEKA
DescriptionLow Power, Low Cost, Rail-to-Rail I/O Amplifiers
CLC1011 Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Advance Data Sheet
Application Information
General Description
The CLCx011 family of amplifiers are single supply, general
purpose, voltage-feedback amplifiers. They are fabricated
on a complimentary bipolar process, feature a rail-to-rail in-
put and output, and are unity gain stable.
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.
+Vs
6.8μF
Input
+
0.1μF
-
0.1μF
Rf
Output
RL
Rg
6.8μF
-Vs
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
6.8μF
-Vs
G=1
Figure 3. Unity Gain Circuit
©2009 CADEKA Microcircuits LLC
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 10k 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
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:
(VLOAD)RMS = VPEAK / √2
( ILOAD)RMS = ( VLOAD)RMS / Rloadeff
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