Texas Instruments INA1620EVM, User Manual, Page: 9 / 24

Input Level (Vrms)
THD
+N
Ratio (d
B)
0.01 0.1 1 3
-120
-100
-80
-60
-40
-20
0
Left Channel
Right Channel
Frequency (Hz)
THD
+N
Ratio (d
B)
-110
-105
-100
-95
-90
-85
-80
100 1k 10k
Left Channel
Right Channel
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Test Setup and Results
9 SBOU205 – March 2018
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INA1620EVM Audio Amplifier Evaluation Module
Figure 5 shows the THD+N vs Frequency for a 16- Ω load.
Figure 5. THD+N vs Frequency for a 16- Ω Load
4.6 THD+N vs. Amplitude
For all THD+N vs Amplitude measurements, the output amplitude was swept from 10 mV
RMS
to 3 V
RMS
at a
frequency of 1 kHz. The measurement bandwidth of the Audio Precision was set to 22 kHz. Note that
driving low impedance loads from power supply voltages larger than ±5 V may cause the output of the
INA1620 to clip at a lower output amplitude than what is shown in the measurements because the
increased power dissipation in the amplifier will trigger the thermal protection circuitry. See the
INA1620
product datasheet Application and Implementation section for information on calculating power dissipation.
Figure 6 shows the THD+N vs Amplitude for a 32- Ω load.
Figure 6. THD+N vs Amplitude for a 32- Ω Load