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CLC5623 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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CLC5623 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 12 page  11 http://www.national.com Figure 17: Differential Line Driver wtih Load Impedance Conversion Set up the CLC5623 as a difference amplifier: Make the best use of the CLC5623’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 CLC5623 also affects the match. With an ideal transformer we obtain: where Zo(5623)(jω) is the output impedance of the CLC5623 and |Zo(5623)(jω)| << Rm. The load voltage and current will fall in the ranges: The CLC5623’s high output drive current and low distortion make it a good choice for this application. Bandpass Filter Figure 18 illustrates a low-sensitivity bandpass filter and design equations. This topology utilizes the CLC5623’s closely matched amplifiers to obtain low op-amp sensitivity at high frequencies. The third CLC5623 is used as a buffer to obtain low output impedance. The overall circuit gain is unity. For additional gain, the third CLC5623 can be configured as a non-inverting amplifier. To design the filter, choose C and then determine values for R and R1 based on the desired resonant frequency (fr) and Q factor. Figure 18: Bandpass Filter Topology Instrumentation Amplifier An instrumentation circuit is shown on the front page and reproduced in Figure 19. The DC CMRR can be fine tuned by adjusting R1. Figure 19: Instrumentation Amplifier Vn V I I n o o ≤⋅ ≤ max max 1/3 CLC5623 + - 750 Ω R1 750 Ω - + 750 Ω 750 Ω Vout = 3(V2 - V1) 750 Ω 750 Ω 750 Ω - + V1 V2 1/3 CLC5623 1/3 CLC5623 + - R 1/3 CLC5623 + - Vo R R - + 1/3 CLC5623 Vin R Rf R1 C C R 1 2f C RQR r 1 == π 1/3 CLC5623 + - 1/3 CLC5623 Rg2 + Vo - - + Rt2 Rf2 Rf1 Rg1 1/3 CLC5623 Vin Rt1 Rm/2 Rm/2 RL Zo UTP Io Req 1:n Vd/2 -Vd/2 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 5623 o =− ⋅ ⋅ () () ω |
Similar Part No. - CLC5623 |
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Similar Description - CLC5623 |
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