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CLC5602IM Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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CLC5602IM Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 12 page  http://www.national.com 10 Figure 12: Lowpass Filter Topology Figure 13: Design Equations This example illustrates a lowpass filter with Q = 0.707 and corner frequency fc = 10MHz. A Q of 0.707 was chosen to achieve a maximally flat, Butterworth response. Figure 14 indicates the filter response. Figure 14: Lowpass Response Differential Line Driver With Load Impedance Conversion The circuit shown in the Typical Application schematic on the front page and in Figure 15, operates as a differential line driver. The transformer converts the load impedance to a value that best matches the CLC5602’s output capabilites. The single-ended input signal is converted to a differential signal by the CLC5602. The line’s characteristic impedance is matched at both the input and the output. The schematic shows Unshielded Twisted Pair for the transmission line; other types of lines can also be driven. Figure 15: Differential Line Driver wtih Load Impedance Conversion Set up the CLC5602 as a difference amplifier: Make the best use of the CLC5602’s output drive capability as follows: where Req is the transformed value of the load imped- ance, Vmax is the Output Voltage Range, and Imax is the maximum Output Current. Match the line’s characteristic impedance: Select the transformer so that it loads the line with a value very near Zo over frequency range. The output impedance of the CLC5602 also affects the match. With an ideal transformer we obtain: Frequency (Hz) -21 -15 -9 -3 3 1M 10M 100M Gain K 1 R R Corner frequency 1 RR C C Q 1 RC RC RC RC (1 K) RC RC For R R R and C C C 1 RC Q 1 (3 K) f g c 12 1 2 22 11 12 21 11 22 12 1 2 c == + == = ++ − == = = = = − ω ω V V 21 R R 2 R R d in f1 g1 f2 g2 =⋅ + =⋅ RR 2V I meq max max += ⋅ RZ RR n R R Lo meq L eq = = = Return Loss 20 log nZ j Z ,dB 10 2 o 5602 o =− ⋅ ⋅ () () ω + - 1/2 CLC5602 Rg2 + Vo - - + Rt2 Rf2 Rf1 Rg1 1/2 CLC5602 Vin Rt1 Rm/2 Rm/2 RL Zo UTP Io Req 1:n Vd/2 -Vd/2 + - Rf 1k Ω 0.1 µF C1 Vo Vin Rg 5k Ω 4 0.1 µF 0.1 µF 5k Ω 3 2 +5V 0.1 µF 100 Ω 1.698k Ω R1 158 Ω R2 158 Ω C2 100pF 1/2 CLC5602 8 1 |
Similar Part No. - CLC5602IM |
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Similar Description - CLC5602IM |
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