THS4531
SLOS358B –SEPTEMBER 2011–REVISED MARCH 2012
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RG
RF
10
VIN–
VOUT–
To Analyzer
VOUT+
100 pF
VS+
+
VOCM
From Analyzer
THS4531
–
0.22 μF
RG
10
VIN+
RF
100 pF
Figure 80. THS4531 Audio Analyzer Test Circuit
−95
VS = 5 V
G = 1 V/V
VOUT = 1 VRMS
No Weighting
A−Weighting
−97
−99
RF = 2 kΩ
RL = 600 Ω
−101
−103
−105
−107
−109
−111
−113
−115
0
5k
10k
15k
20k
24k
Frequency (Hz)
G070
Figure 81. THD+N on Audio Analyzer, 10 Hz to 24 kHz
0
−10
−20
−30
−40
VS = 5 V
G = 1 V/V
VOUT = 1 VRMS
RF = 2 kΩ
RL = 600 Ω
−50
−60
−70
−80
−90
−100
−110
−120
−130
−140
0
5k
10k
15k
20k
24k
Frequency (Hz)
G071
Figure 82. 1kHz FFT Plot on Audio Analyzer
36
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