SLOA292 May   2020 TAS5760LD

 

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5.1 Terminations Resistor Design With Practical Application Waveform

On a real application, the output transient is improved from -11 mV to -2 mV as shown in Figure 13 by decreasing termination resistor from 1 kΩ to 270 Ω resistor.

Pros: Termination resistor decrease the output transient obviously.

Cons: The current is higher if using smaller termination resistor. From Equation 2, the power consumption increases 3.7 times if using 270 Ω resistor.

Equation 2. slos292-equation-1.gif
Equation 3. slos292-equation-2.gif
sloa292-tas5760ld-line-drivers-waveform-the-termination-resistor-is-270-ohm.gifFigure 13. TAS5760LD Line Driver’s Waveform With 270 Ω Termination Resistor

CH1 is input from SOC. CH2 is line driver output. CH3 is (DR_MUTE ) controlled waveform by SOC’s GPIO. CH4 is 3.3V for line driver power. The output transient is improved from -11mV.