Texas Instruments INA1620EVM, Руководство пользователя, Страница: 12 / 24

Frequency (Hz)
CMRR(dB)
20 100 1000 10000 100000 200000 200000
-90
-80
-70
-60
-50
Left Channel
Right Channel
Frequency (Hz)
Amplitude (
dBV)
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
-160
-140
-120
-100
-80
-60
-40
-20
0
Right Channel
Test Setup and Results
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12 SBOU205 – March 2018
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INA1620EVM Audio Amplifier Evaluation Module
Figure 11 shows an FFT of the right channel with a 16- Ω load. The second harmonic was measured to be
–120.68 dBV.
Figure 11. FFT of Right Channel With a 16- Ω Load
4.8 CMRR vs. Frequency
For all CMRR vs Frequency measurements, the Audio Precision was configured to provide a common-
mode input signal into the INA1620EVM. This common-mode signal was configured to an amplitude of 1
V
RMS
and swept from 20 Hz to 200 kHz. Figure 12 shows CMRR vs Frequency with no load on the
INA1620 output.
Figure 12. CMRR vs Frequency With No Load