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CLC1005 Datasheet(PDF) 13 Page - Exar Corporation |
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CLC1005 Datasheet(HTML) 13 Page - Exar Corporation |
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13 / 19 page  © 2007-2015 Exar Corporation 13 / 19 exar.com/CLC1005 Rev 2D CLC1005, CLC1015, CLC2005 Overdrive Recovery For an amplifier, an overdrive condition occurs when the output and/or input ranges are exceeded. The recovery time varies based on whether the input or output is overdriven and by how much the ranges are exceeded. The CLC1005, CLC1015, and CLC2005 will typically recover in less than 20ns from an overdrive condition. Figure 6 shows the CLC2005 in an overdriven condition. Time (20ns/div) Output Input RL = 2kΩ Vin =2Vpp G = 5 Rf = 1kΩ Figure 6: Overdrive Recovery Enable/Disable Function The CLC1015 offers an active-low disable pin that can be used to lower its supply current. Leave the pin floating to enable to part. Pull the disable pin to the negative supply (which is ground in a single supply application) to disable the output. During the disable condition, the nominal supply current will drop below 127μA and the output will be at a high impedance with about 2pF capacitance. Power Dissipation Power dissipation should not be a factor when operating under the stated 2kΩ load condition. However, applications 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 operating range. Maximum power levels are set by the absolute maximum junction rating of 150°C. To calculate the junction temperature, the package thermal resistance value ThetaJA (θJA) is used along with the total die power dissipation. TJunction = TAmbient + (θJA × 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 equation. Psupply = Vsupply × IRMSsupply 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 values along with known supply voltage, Vsupply. Load power can be calculated as above with the desired signal amplitudes using: (Vload)RMS = Vpeak / √2 ( Iload)RMS = ( Vload)RMS / Rloadeff The dynamic power is focused primarily within the output stage driving the load. This value can be calculated as: PDynamic = (VS+ - Vload)RMS × ( Iload)RMS Assuming the load is referenced in the middle of the power rails or Vsupply/2. The CLC1015 is short circuit protected. However, this may not guarantee that the maximum junction temperature (+150°C) is not exceeded under all conditions. Figure 7 shows the maximum safe power dissipation in the package vs. the ambient temperature for the packages available. |
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