SLVUDB0A August 2025 – October 2025
By default, the TSWDC155EVM provides the ADS9324EVM with a 3.3V supply (3P3V). The ADS9324EVM has a TPS61070 boost converter that boosts the 3.3V supply to 5.4V. By default, this voltage is applied to low-dropout regulators (LDOs) to derive the AVDD_5V, AVDD_1V8, and IOVDD supplies when JP1 is in the [1-2] position. U5 (TPS7A2050) provides the 5V AVDD_5V supply, U6 (TPS7A2018) provides the AVDD_1V8 supply, and U4 (TPS7A2033) provides 3.3V for IOVDD, respectively. The LDO input voltage can be changed to an external source (5.2V to 5.5V) applied to terminal block J19 by placing a shunt on JP1 in the [2-3] position. In this case, U3 (LM66100) provides reverse polarity protection if the connection is wired incorrectly.
IOVDD can be either 1.8V or 3.3V. This allows ADS9324 the interface with both FPGAs and MCUs.
To set the IOVDD = 1.8V on the EVM:
To set the IOVDD = 3.3V on the EVM:
Figure 2-7 shows the power tree schematic for the ADS9324EVM.