Datasheet
Voltage (V)
0 50 100 150 200
Time (ms)
PD
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Outputs
PD ENABLE POP PERFORMANCE
Voltage (V)
0 50 100 150 200
Time (ms)
Power
Supply
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Outputs
POWER-SUPPLY TURN-ON POP PERFORMANCE
Voltage (V)
0 50 100 150 200
Time (ms)
PD
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Outputs
PD DISABLE POP PERFORMANCE
Voltage (V)
0 50 100 150 200
Time (ms)
Power
Supply
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Outputs
POWER-SUPPLY TURN-OFF POP PERFORMANCE
THS4521
THS4522
THS4524
SBOS458F –DECEMBER 2008–REVISED SEPTEMBER 2011
www.ti.com
Audio On/Off Pop Performance space
The THS4521 was tested to show on and off pop With no tone input, Figure 74 shows the pop
performance by connecting a speaker between the performance using the PD pin to enable the
differential outputs and switching the power supply on THS4521, and Figure 75 shows performance using
and off, and also by using the PD function of the the PD pin to disable the device. Again, the transients
THS4521. Testing was done with and without tones. during power on and off show that no audible pop
During these tests, no audible pop could be heard. should be heard. It should also be noted that the turn
on/off times are faster using the PD pin technique.
With no tone input, Figure 72 shows the pop
performance when switching power on to the
THS4521 and Figure 73 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 74. THS4521 PD Pin Enable Pop
Performance
Figure 72. THS4521 Power-Supply Turn-On Pop
Performance
Figure 75. THS4521 PD Pin Disable Pop
Performance
The power on/off pop performance of the THS4521,
whether by switching the power supply or when using
Figure 73. THS4521 Power-Supply Turn-Off Pop
the power-down function built into the chip, shows
Performance
that no special design should be required to prevent
an audible pop.
space
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Product Folder Link(s): THS4521 THS4522 THS4524