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CLC5665IM Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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CLC5665IM Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 8 page  http://www.national.com 6 Set up the CLC5665 as a difference amplifier. Vd is determined by: Make the best use of the CLC5665’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 CLC5665 also affects the match. With an ideal transformer we obtain: where Zo(5665)(jω) is the output impedance of the CLC5665 and |Zo(5665)(jω)| << Rm. The load voltage and current will fall in the ranges: The CLC5665’s high output drive current and low distortion make it a good choice for this application. Full Duplex Cable Driver The circuit shown in Figure 8 below, operates as a full duplex cable driver which allows simultaneous transmis- sion and reception of signals on one transmission line. The circuit on either side of the transmission line uses are CLC5665 as a cable driver, and the second CLC5665 as a receiver. VoA is an attenuated version of VinA, while VoB is an attenuated version of VinB. Figure 8: Full Duplex Cable Driver Rm1 is used to match the transmission line. Rf2 and Rg2 set the DC gain of the CLC5665, which is used in a difference mode. Rt2 provides good CMRR and DC offset. The transmitting CLC5665’s are shown in a unity gain configuration because they consume the least power of any gain, for a given load. For proper operation we need Rf2 = Rg2. The receiver output voltages are: where A is the attenuation of the cable, Zo(5665)(jω) is the output impedance of the CLC5665, and |Zo(5665)(jω)| << Rm1. We selected the component values as follows: s Rf1 = 1.2kΩ, the recommended value for CLC5665 at unity gain s Rm1 = Zo = 50Ω, the characteristic impedance of the transmission line s Rf2 = Rg2 = 750Ω ≥ Rm1, the recommended value for the CLC5665 at Av = 2 s These values give excellent isolation from the other input: The CLC5665 provides large output current drive, while consuming little supply current, at the nominal bias point. It also produces low distortion with large signal swings and heavy loads. These features make the CLC5665 an excellent choice for driving transmission lines. 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 5665 o =− ⋅ ⋅ () () ω Vn V I I n o o ≤⋅ ≤ max max Rf1 + - Rt1 Z0 Rf2 - + CLC5665 VinA Rg2 Rt2 Rm1 VoB Rf1 + - Rt1 Rf2 - + VinB Rg2 Rt2 Rm1 VoA CLC5665 CLC5665 CLC5665 VV A V 2 1 R R Z(j ) R outA(B) inA(B) inB(A) f2 g2 o(5665) m1 ≈⋅ + ⋅ − + ω R(R || R ) – R 2 25 t2 f2 g2 m1 == Ω V V 38dB, f 5.0MHz oA(B) inB(A) ≈− = |
Similar Part No. - CLC5665IM |
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Similar Description - CLC5665IM |
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