THS4522IPW datasheet(33/71 Pages) TI2

33 / 71 page

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PD ENABLE POP PERFORMANCE

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PD DISABLE POP PERFORMANCE

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POWER-SUPPLY TURN-ON POP PERFORMANCE

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POWER-SUPPLY TURN-OFF POP PERFORMANCE

THS4521, THS4522, THS4524

www.ti.com

SBOS458H – DECEMBER 2008 – REVISED JUNE 2015

8.3.12 Audio On/Off Pop Performance

The THS4521 was tested to show on and off pop performance by connecting a speaker between the differential

outputs and switching the power supply on and off, and also by using the PD function of the THS4521. Testing

was done with and without tones. During these tests, no audible pop could be heard.

With no tone input, Figure 70 shows the pop performance when switching power on to the THS4521 and

Figure 71 shows the device performance when turning the power off. The transients during power on and off

illustrate that no audible pop should be heard

Figure 70. THS4521 Power-Supply Turn-On Pop

Figure 71. THS4521 Power-Supply Turn-Off Pop

Performance

With no tone input, Figure 72 shows the pop performance using the PD pin to enable the THS4521, and

Figure 73 shows performance using the PD pin to disable the device. Again, the transients during power on and

off show that no audible pop should be heard. It should also be noted that the turn on/off times are faster using

the PD pin technique.

Figure 72. THS4521 PD Pin Enable Pop Performance

Figure 73. THS4521 PD Pin Disable Pop Performance

The power on/off pop performance of the THS4521, whether by switching the power supply or when using the

power-down function built into the chip, shows that no special design should be required to prevent an audible

pop.

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Product Folder Links: THS4521 THS4522 THS4524

THS4522IPW Datasheet(PDF) 33 Page - Texas Instruments

THS4522IPW Datasheet(HTML) 33 Page - Texas Instruments

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