PSIEVM Design Overview
20
SBAU289 – October 2017
Copyright © 2017, Texas Instruments Incorporated
Precision Signal Injector EVM (PSIEVM)
Figure 18. ADS8681EVM GUI Spectral Analysis for PSIEVM Input
Table 15. Example 3 Results
Measurement
Value
SNR
86.4 dB
THD
–109.6 dB
5
PSIEVM Design Overview
5.1
Analog Interface
The evaluation board uses a variety of amplifiers in different configurations to compose the output signal
based on the user inputs through the GUI. The signal path is explained fully in
.
5.2
Digital Interface
The EVM communicates with the computer over USB. There are two devices on the EVM that
communicate to the computer: the MSP430F5503 and the electrically erasable programmable read-only
memory (EEPROM). The EEPROM comes pre-programmed with calibration coefficients and is ready to
use out-of-the-box.