THS4531A_16 Datasheet, PDF (34/59 Pages) Texas Instruments – Ultra Low-Power, Rail-to-Rail Output, Fully Differential Amplifier

THS4531A
SLOS823C – DECEMBER 2012 – REVISED JANUARY 2016
www.ti.com
9.1.11 Audio On and 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 82 shows the voltage waveforms when switching power on to the THS4531A and
Figure 83 shows voltage waveforms when turning power off. The transients during power on and off show no
audible pop should be heard.
5
2.5
5
2.5
Power Supply
V_OUT +
4
2
4
V_OUT −
2
V_S = 5 V
V_S = 5 V
3
G = 2 V/V ^1.5
3
G = 2 V/V ^1.5
R_F = 2 kΩ
R_F = 2 kΩ
R_L = 200 Ω
R_L = 200 Ω
2
1
2
1
1
Power Supply 0.5
V_OUT +
V_OUT −
0
0
0
50m
100m
150m
200m
Time (s)
G072
Figure 82. Power Supply Turnon Pop Performance
1
0.5
0
0
0
50m
100m
150m
200m
Time (s)
G073
Figure 83. Power Supply Turnoff Pop Performance
With no input tone, Figure 84 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.
5
2.5
Power Down
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)
G074
Figure 84. PD Enable Pop Performance
34
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