Texas Instruments ADS122C04EVM

Overview

ADS122C04EVM from Texas Instruments is an evaluation module kit designed to support hardware and software validation of the ADS122C04 - a 24-bit, 2-kSPS, 4-channel delta-sigma analog-to-digital converter (ADC) used in precision sensor measurement systems. The EVM integrates the ADS122C04 device with a TM4C1294NCPDT microcontroller for I²C communication, onboard 2.5-V reference, configurable analog input terminal blocks (J6/J7), and PC-based GUI software for register control and real-time data acquisition.

For engineers reviewing the ADS122C04EVM datasheet, ADS122C04EVM pinout, ADS122C04EVM application, or ADS122C04EVM equivalent, this page provides verified technical context, key specifications, supply readiness, manufacturer background, and targeted FAQs - all focused on rapid evaluation setup, sensor interface configuration (RTD/thermocouple/bridge), and register-level ADC characterization.

Technical Context

The ADS122C04EVM implements a complete evaluation platform centered on the ADS122C04 ADC, interfacing it via I²C to a TM4C1294NCPDT host controller that bridges USB 2.0 communication to a Windows PC. It supports unipolar AVDD operation at 3.3 V or 5 V, DVDD at 3.3 V, and offers flexible reference options including an onboard 2.5-V LDO (U24) or external REF+ / REF– inputs via J7.

Hardware configurability includes jumper-selectable excitation sources (IDAC or AVDD), RTD pedestal biasing (JP14), thermocouple input biasing (JP12/JP13), analog common (COM) routing (JP18), and I²C address selection (JP7/JP8). All digital signals between the Tiva MCU and ADS122C04 are level-shifted to ensure voltage compatibility across domains.

Key Specifications

Availability

ADS122C04EVM is available at Aetrix Electronics and suitable for precision sensor evaluation, industrial temperature monitoring, RTD-based process control, and embedded ADC validation requiring stable component supply and full toolchain support.

Supply support for ADS122C04EVM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with leadership in high-precision data converters and industrial interface solutions.

The ADS122C04EVM belongs to TI's precision delta-sigma ADC evaluation platform family, engineered specifically to accelerate development for sensor signal chains in temperature, pressure, and strain measurement applications.

FAQ

What is the primary function of the ADS122C04EVM?

The ADS122C04EVM is an evaluation module kit that enables hardware and software validation of the ADS122C04 24-bit delta-sigma ADC. It provides a ready-to-use platform with integrated TM4C1294NCPDT controller, USB interface, configurable analog inputs, onboard reference, and PC-based GUI software - allowing engineers to evaluate performance, configure registers, acquire sensor data, and verify system integration without custom PCB design. The ADS122C04EVM itself is not an IC but a complete evaluation system built around the ADS122C04.

Does the ADS122C04EVM include the ADS122C04 device?

Yes, the ADS122C04EVM includes one ADS122C04 device mounted on the board as the core ADC under test. The EVM documentation explicitly states "the ADS1x2C04EVM kit includes the ADS1x2C04 device along with a USB micro cable, and downloadable supporting software." This makes the ADS122C04EVM a turnkey solution for evaluating the ADS122C04's 24-bit resolution, 2-kSPS sampling, and 4-channel multiplexed input architecture in real-world sensor configurations.

How is communication established between the PC and the ADS122C04EVM?

Communication between the PC and the ADS122C04EVM occurs over USB 2.0 using the onboard TM4C1294NCPDT microcontroller as a USB-to-I²C bridge. The TM4C1294NCPDT handles USB enumeration, runs the Delta-Sigma ADC Evaluation Software firmware, and manages bidirectional I²C traffic with the ADS122C04. No external FTDI or UART-to-USB adapter is required - the ADS122C04EVM appears as a native USB CDC device when connected, enabling direct register access and real-time data streaming via the GUI.

Can the ADS122C04EVM support external voltage references?

Yes, the ADS122C04EVM supports external voltage references through terminal block J7: REF+ connects to pin 1 and REF– connects to pin 2. Switch S5 selects whether the reference path routes to the onboard 2.5-V reference (U24) or to J7 via JP17. When S5 is in the "Down" position and JP17 is set to 2–3, the ADS122C04's VREF pin receives the external reference. This allows users to validate ADC performance with custom references, such as low-noise 4.096-V or 5.0-V sources, directly impacting full-scale range and effective resolution in the ADS122C04EVM setup.

What sensor types can be evaluated using the ADS122C04EVM's analog input terminals?

The ADS122C04EVM's J6 terminal block supports direct connection of 2-wire, 3-wire, and 4-wire RTDs (via JP6/JP9/JP14), thermocouples (with JP12/JP13 biasing), resistive bridge sensors, and generic voltage/current sources. Figures 16–21 in the user guide provide simplified schematics for each configuration. The ADS122C04EVM's excitation current source (IDAC), programmable gain amplifier, and flexible MUX allow precise characterization of these sensors - making it suitable for validating cold-junction compensation, RTD linearization, and bridge offset/nulling in the ADS122C04EVM environment.