THS4531A Datasheet, PDF (34/51 Pages) Texas Instruments – Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier

THS4531A
SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013
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Audio On/Off Pop Performance
The THS4531A is tested to show on and off pop performance by connecting a speaker between the differential
outputs and switching on and off the power supply, and also by using the power down function of the THS4531A.
Testing was done with and without tones. During these tests no audible pop could be heard.
With no input tone, Figure 85 shows the voltage waveforms when switching power on to the THS4531A and
Figure 86 shows voltage waveforms when turning power off. The transients during power on and off show no
audible pop should be heard.
5
2.5
4
2
V_S = 5 V
3
G = 2 V/V ^1.5
R_F = 2 kΩ
R_L = 200 Ω
2
1
1
Power Supply 0.5
V_OUT +
V_OUT −
0
0
0
50m
100m
150m
200m
Time (s)
G072
Figure 85. Power Supply Turn On Pop Performance
5
2.5
Power Supply
V_OUT +
4
V_OUT −
2
V_S = 5 V
3
G = 2 V/V ^1.5
R_F = 2 kΩ
R_L = 200 Ω
2
1
1
0.5
0
0
0
50m
100m
150m
200m
Time (s)
G073
Figure 86. Power Supply Turn Off Pop Performance
With no input tone, Figure 87 shows the voltage waveforms using the PD pin to enable and disable the
THS4531A. The transients during power on and off show no audible pop should be heard.
34
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