Texas Instruments INA1620EVM, User Manual, Page: 6 / 24

Test Setup and Results
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6 SBOU205 – March 2018
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INA1620EVM Audio Amplifier Evaluation Module
4 Test Setup and Results
This section describes how to properly connect, set up, and use the INA1620EVM. This section also
includes measured data of the INA1620EVM to display typical performance of the INA1620EVM.
Measurements include:
• THD+N vs Frequency for a 32- and 16- Ω load
• THD+N vs Amplitude for a 32- and 16- Ω load
• Fast-Fourier Transform (FFT) for a 32- and 16- Ω load
• CMRR vs. Frequency with no output load
The THD+N vs Frequency , THD+N vs Amplitude , FFT , and CMRR vs Frequency measurements were
taken using an Audio Precision APx555. All measurements were taken using ±15-V supplies at an
ambient temperature of 25 °C, unless otherwise noted.
4.1 Power Supply Connections
Power-supply connections to the INA1620EVM are made through screw terminal connector J5 at the top
of the EVM. The positive power supply connection is marked V
cc
, the negative supply connection V
ee
, and
the ground connection GND. To connect power to the EVM, insert wires into each terminal, then tighten
the screws to make the connection.
Figure 3 shows the proper way to connect power to the INA1620EVM.
For minimum and maximum supply voltages of the INA1620EVM, see the INA1620 product data sheet .