Texas Instruments ADS1220EVM

Overview

ADS1220EVM from Texas Instruments is an evaluation module designed to accelerate prototyping and functional validation of the ADS1220 - a 24-bit, low-power, delta-sigma analog-to-digital converter with integrated PGA, IDACs, burnout current sources, and internal temperature sensor. It supports ratiometric bridge, RTD, thermocouple, and precision single-ended measurements using internal or external voltage references (2.048 V internal, REFP0/REFP1), and operates via SPI interface with MSP430 microcontroller-based USB host control.

For engineers reviewing the ADS1220EVM datasheet, ADS1220EVM pinout, ADS1220EVM application, or ADS1220EVM equivalent, this page delivers verified hardware architecture, jumper-configurable excitation and reference routing, ADCPro™-integrated real-time register control, and direct test-point access to all ADS1220 digital/analog signals - critical for sensor signal chain validation, firmware development, and system-level accuracy testing.

Technical Context

The ADS1220EVM implements full hardware support for the ADS1220's key features: dual 10-µA IDACs independently routable to any analog input or reference pin; programmable PGA gain (1–128) with bypass option; selectable FIR filter modes including simultaneous 50/60 Hz rejection; and low-side power switch on AIN3 for bridge excitation gating. All functions are controllable in real time via ADCPro software.

Hardware design enables direct sensor interfacing via J1/J2/J3/J4/J6 headers - supporting 2-/3-/4-wire RTDs, full-bridge load cells, miniature thermocouples (Omega PCC-SMP), and general-purpose analog inputs - with configurable analog filtering pads, excitation routing jumpers (JP1/JP2), and dual reference options (REFP0/REFP1). Power is supplied via USB (+5 V) with onboard LDO regulation to +3.3 V.

Key Specifications

Availability

ADS1220EVM is available at Aetrix Electronics and suitable for precision sensor evaluation, industrial temperature monitoring, weigh-scale prototyping, and embedded data acquisition systems requiring stable component supply and full signal-chain validation capability.

Supply support for ADS1220EVM 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 and embedded processing technologies, with leadership in precision data converters, power management, and microcontrollers.

The ADS1220EVM belongs to TI's precision ADC evaluation platform family, engineered specifically to demonstrate high-accuracy, low-noise measurement capabilities of the ADS1220 in real-world sensor applications - including RTD, thermocouple, and bridge-based systems - with minimal external circuitry.

FAQ

What is the primary function of the ADS1220EVM?

The ADS1220EVM is an evaluation module built around the ADS1220 24-bit delta-sigma ADC. Its primary function is to enable rapid hardware and firmware validation of precision analog measurement circuits - including RTD, thermocouple, load cell, and general-purpose sensor interfaces - using real-time ADCPro software control, configurable excitation, and multiple reference options. The ADS1220EVM itself contains no ADC functionality beyond hosting and exercising the ADS1220 device.

Does the ADS1220EVM support both internal and external voltage references?

Yes, the ADS1220EVM supports three reference configurations: the ADS1220's internal 2.048 V reference (default at power-up), an external dedicated reference applied to REFP0/REFN0 (via J2.4 and J4.9–J4.10), and a shared reference applied to REFP1/REFN1 (via J1.1, J1.4, J2.2, J4.2, J4.8, J6.1, J6.4). Reference selection is controlled in real time via the ADCPro "Current & Ref" tab, and VREF display scaling updates accordingly.

How is the ADS1220EVM powered, and what supply rails does it generate?

The ADS1220EVM is powered via USB Type-A connector J9, delivering +5 V to the board. JP7 defaults to shorted, routing USB power to the +5 V rail. JP8 (shorted by default) enables the onboard TPS76333 LDO to generate a regulated +3.3 V supply for digital and analog circuitry. AVDD and AGND are accessible at J4 pins, and +5 V/+3.3 V test points (TP8/TP9) allow external probing or auxiliary supply injection.

Can the ADS1220EVM be used with controllers other than the onboard MSP430?

Yes. The ADS1220EVM supports external controller integration via bottom-side JAC and JDB 20-pin dual-row sockets (Samtec SSW-110-22-F-D-VS-K footprint), which mirror LaunchPad pinout. To disable the onboard MSP430, short JP5 - placing buffer U8 outputs in high-impedance state. Digital signals (CS, SCLK, DIN, DOUT/DRDY) are also exposed at test points TP1–TP5 for direct connection to custom hosts.

What sensor types are directly supported by the ADS1220EVM hardware?

The ADS1220EVM provides native hardware support for four sensor categories: (1) 2-/3-/4-wire RTDs via J2 terminal block with bias resistor R3 and optional R30 jumper; (2) full-bridge sensors via J1/J6 screw terminals and headers with JP1/JP2 excitation routing; (3) miniature thermocouples via Omega PCC-SMP socket J3 with cold-junction compensation using the ADS1220's internal temperature sensor; and (4) general-purpose analog inputs via J4 header with configurable filtering pads.