3 ADS1x48EVM Overview
Various onboard components are used to provide power to, communicate with, and interface the analog input to
the ADS1x48 device.
3.1 Analog and Digital Power Supplies
The ADS1x48 supports a wide unipolar analog supply voltage (AVDD) range from 2.7 V to 5.5 V and a bipolar
AVDD of ±2.5 V. The ADS1x48EVM AVDD can be set to either 3.3 V or 5 V. Power is supplied from the USB 5-V
source to the PAMBoard. However, the USB power-supply voltage is not consistent from PC to PC. A DC/DC
converter on the PAMBoard increases the USB output to 5.5 V. A linear low-dropout (LDO) regulator uses this
5.5-V output to provide clean and stable 5-V and 3.3-V supplies from the PAMBoard to the ADS1x48EVM.
Two LEDs light up on the PAMBoard, as shown in
, when the USB cable is plugged into the computer.
The top LED (D1) indicates that the ADS1x48EVM is ready to communicate with the GUI. The bottom LED (D5)
indicates that the 5-V output is active.
Figure 3-1. LED Indicators D1 and D5
Jumper JP1 selects the ADS1x48 AVDD voltage. When jumper JP1 is in the left position (see
), AVDD
on the ADS1x48 is set to 5 V. When the jumper JP1 is set to the right position, AVDD is set to 3.3 V.
ADS1x48EVM Overview
SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
ADS1x48EVM Evaluation Module
7
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