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CLC453 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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CLC453 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 12 page 11 http://www.national.com Twisted Pair Driver The high output current and low distortion, of the CLC453, make it well suited for driving transformers. Figure 13 illustrates a typical twisted pair driver utilizing the CLC453 and a transformer. The transformer provides the signal and its inversion for the twisted pair. Figure 13: Twisted Pair Driver To match the line’s characteristic impedance (Zo) set: s RL = Zo s Rm = Req Where Req is the transformed value of the load imped- ance, (RL), and is approximated by: Select the transformer so that it loads the line with a value close to Zo, over the desired frequency range. The output impedance, Ro, of the CLC453 varies with frequency and can also affect the return loss. The return loss, shown below, takes into account an ideal transformer and the value of Ro. The load current (IL) and voltage (Vo) are related to the CLC453’s maximum output voltage and current by: From the above current relationship, it is obvious that an amplifier with high output drive capability is required. R R n eq L 2 = Return Loss(dB) 20log n R Z 10 2 o o ≈ − ⋅ V n V I I n o max L max ≤ ⋅ ≤ 453 Fig13 + Vo - Rm RL Zo UTP IL Req 1:n V = Av Vin V n 4 A V v in = V -n 4 A V v in = V 1n 2 A V o v in = Vin Rt 1 CLC453 7 6 8 5 3 4 2 1k Ω 1k Ω 0.1 µF 6.8 µF + VEE Av = 2 |
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