Texas Instruments ADS1x48EVM, User Manual, Page: 5 / 48

1 Introduction
The ADS1x48EVM is a fully assembled evaluation platform designed to highlight the ADS1x48 features and
modes of operation that make this device suitable for measuring analog temperature sensors. The EVM sits
on top of an accompanying precision ADC motherboard (PAMBoard) used as a USB-to-PC GUI communication
bridge. This board combination also serves as an example implementation of connecting a microcontroller
(MCU) to communicate with the ADS1x48 device through a serial-peripheral interface (SPI).
Figure 1-1 shows a
functional block diagram for the ADS1x48EVM.
Note
The ADS1x48EVM requires an external controller to evaluate the ADS1x48 device.
The PAMBoard is controlled by commands received from the ADS1x48EVM GUI, and returns data to the GUI
for display and analysis. If the PAMBoard is not used, the EVM plug-in module format allows for an alternative
external host to communicate with the ADS1x48 through the pin headers J1 through J4. Header connections are
identified in
Section 5.2 and listed in Table 3-2 .
The combined ADS1x48EVM and PAMBoard incorporate the following features:
• ADS1x48, a 16- or 24-bit delta-sigma ADC with eight input channels
• Input terminal block and jumper configurations that enable easy measurement of many types of analog
temperature sensors
• Analog voltage (AVDD) selection of 3.3-V or 5-V operation for the ADS1x48
• Multiple voltage reference options: 2.048-V reference integrated into the ADS1x48, discrete REF5025,
ratiometric reference for RTD measurements, or external reference supplied via the input terminal blocks
• Internal or external clock selection
• SPI for communication and configuration
Analog Header and
Terminal Block
Analog Inputs
and RC Filter
ADC
Analog Power
Source
PAMBboard
Digital Interface
PAMBoard
Power
EEPROM
Device ID
SPI /
GPIO I2C
AVDD
3.3 V
5 V
DVDD
REF5025
2.5 V
REF
Figure 1-1. ADS1x48EVM Functional Block Diagram
Table 1-1 lists documents related to the ADS1x48EVM.
Table 1-1. Related Documentation
Device Literature Number
ADS1248 SBAS426
ADS1148 SBAS453
REF5025 SBOS410
www.ti.com Introduction
SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
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