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CLC4601ISO14 Datasheet(PDF) 11 Page - Cadeka Microcircuits LLC. |
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CLC4601ISO14 Datasheet(HTML) 11 Page - Cadeka Microcircuits LLC. |
11 / 15 page Data Sheet ©2004-2008 CADEKA Microcircuits LLC www.cadeka.com 11 Driving Capacitive Loads Increased phase delay at the output due to capacitive load- ing can cause ringing, peaking in the frequency response, and possible unstable behavior. Use a series resistance, RS, between the amplifier and the load to help improve stability and settling performance. Refer to Figure 6. Figure 6. Addition of RS for Driving Capacitive Loads Table 2 provides the recommended RS for various capaci- tive loads. The recommended RS values result in <=0.5dB peaking in the frequency response. The Frequency Re- sponse vs. CL plot, on page 5, illustrates the response of the CLCx601 Family. CL (pF) RS (Ω) -3dB BW (MHz) 10 40 350 50 20 200 100 15 140 Table 1: Recommended RS vs. CL For a given load capacitance, adjust RS to optimize the tradeoff between settling time and bandwidth. In general, reducing RS will increase bandwidth at the expense of ad- ditional overshoot and ringing. Parasitic Capacitance on the Inverting Input Physical connections between components create unin- tentional or parasitic resistive, capacitive, and inductive elements. Parasitic capacitance at the inverting input can be espe- cially troublesome with high frequency amplifiers. A para- sitic capacitance on this node will be in parallel with the gain setting resistor Rg. At high frequencies, its imped- ance can begin to raise the system gain by making Rg appear smaller. In general, avoid adding any additional parasitic capaci- tance at this node. In addition, stray capacitance across the Rf resistor can induce peaking and high frequency ringing. Refer to the layout considerations section for additional information regarding high speed layout tech- niques. Overdrive Recovery An overdrive condition is defined as the point when either one of the inputs or the output exceed their specified volt- age range. Overdrive recovery is the time needed for the amplifier to return to its normal or linear operating point. The recovery time varies, based on whether the input or output is overdriven and by how much the range is ex- ceeded. The CLCx601 Family will typically recover in less than 20ns from an overdrive condition. Figure 7 shows the CLC2601 in an overdriven condition. Figure 7. Overdrive Recovery Power Dissipation Power dissipation should not be a factor when operating under the stated 1000 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 (ӨJA) is used along with the total die power dissipation. TJunction = TAmbient + (ӨJA × PD) Where TAmbient is the temperature of the working environment. + - Rf Input Output Rg Rs CL RL -4 -3 -2 -1 0 1 2 3 4 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 0 20 40 60 80 100 120 140 160 180 200 Time (ns) Output Input VIN = 1.5Vpp G = 5 |
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