Texas Instruments ADS127L21EVM-PDK

Overview

ADS127L21EVM-PDK from Texas Instruments is an evaluation module designed specifically for the ADS127L21 - a 24-bit, high-speed, wide-bandwidth delta-sigma analog-to-digital converter. It integrates the ADS127L21 IC, THS4561 input driver amplifier, REF6225 voltage reference, TPS7A47/TPS7A30 LDO regulators, and a precision host interface (PHI) controller board enabling USB 2.0 communication. The kit supports differential analog input via SMA connectors, programmable FIR/IIR digital filtering, and real-time spectral/histogram analysis - ideal for high-fidelity data acquisition system validation.

For engineers reviewing the ADS127L21EVM-PDK datasheet, ADS127L21EVM-PDK pinout, ADS127L21EVM-PDK application, or ADS127L21EVM-PDK equivalent, this page delivers verified hardware architecture, USB-powered operation, SPI-based ADC control, onboard low-noise power regulation, and GUI-driven configuration of sampling rate, filter response, and time/frequency domain visualization - all confirmed from TI's official SBAU411 user's guide.

Technical Context

The ADS127L21EVM-PDK implements a complete signal chain: differential analog inputs feed a THS4561 fully-differential amplifier configured as a unity-gain second-order low-pass filter, followed by decoupled AVDD1/AVDD2/IOVDD supplies regulated by TPS7A47 (5 V) and TPS7A30 (–2.5 V), with optional external power routing via J12. Clocking supports dual sources - default 32.768 MHz onboard crystal (Y1) or 24 MHz PHI controller clock - selectable via JP6/JP7 jumpers.

Digital interfacing uses SPI Mode 1 (CPOL = 0, CPHA = 1) at up to 50 MHz between the PHI board and ADS127L21, with 10-Ω series resistors on SDI/SCLK/SDO lines for edge control. An I²C-connected EEPROM (BR24G32FVT-3AGE2) stores EVM identification and initialization data, while the GUI software provides register-level control of CONFIG/ FILTER registers and real-time display of time-domain, FFT, and histogram data.

Key Specifications

Availability

ADS127L21EVM-PDK is available at Aetrix Electronics and suitable for high-precision sensor signal conditioning, industrial process monitoring, and audio test equipment development requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for ADS127L21EVM-PDK 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 high-performance data conversion technologies, with over 90 years of innovation in precision electronics.

The ADS127L21EVM-PDK belongs to TI's Precision Data Acquisition Evaluation Platform product line, engineered to accelerate validation of high-resolution, high-bandwidth ADCs in demanding measurement applications such as vibration analysis, power quality monitoring, and scientific instrumentation.

FAQ

What is the ADS127L21EVM-PDK used for?

The ADS127L21EVM-PDK is a complete evaluation system for the ADS127L21 24-bit delta-sigma ADC. It enables engineers to validate dynamic performance (SNR, THD), configure programmable FIR/IIR filters, analyze time/frequency domain behavior, and integrate the ADC into end systems - all using USB-powered hardware and Windows-based GUI software. The ADS127L21EVM-PDK includes calibrated analog front-end circuitry, precision voltage reference, and low-noise power regulation to reflect real-world design conditions.

Does the ADS127L21EVM-PDK require an external power supply?

No - the ADS127L21EVM-PDK operates entirely from USB power delivered through the included PHI controller board. The PHI supplies 5.5 V to onboard TPS7A47 and TPS7A30 LDOs, generating regulated 5 V (AVDD) and –2.5 V (AVSS) rails. External power is optional and only needed if negative AVSS or non-standard supply voltages are required; it connects via terminal block J12 with jumper JP4/JP5 reconfiguration.

Which software is required to operate the ADS127L21EVM-PDK?

The ADS127L21EVM-PDK requires the official Texas Instruments ADS127L21EVM GUI software, compatible with 64-bit Windows 10. Installation includes LabVIEW™ Run-Time Engine and custom USB device drivers. The GUI provides real-time data capture, FFT and histogram analysis, and full register-level control of the ADS127L21 - including sampling rate, digital filter coefficients, and START/SYNC timing. No third-party tools or firmware flashing is needed to run the ADS127L21EVM-PDK.

Can the ADS127L21EVM-PDK evaluate external voltage references?

Yes - the ADS127L21EVM-PDK supports external voltage references via connector J5 and OPA2320SAIDGSR buffer amplifiers. This path bypasses the onboard REF6225 and allows evaluation of alternative references (e.g., REF70) for improved DC accuracy. The reference buffer is optimized for low offset, low drift, and capacitive load drive - matching the switched-capacitor input requirements of the ADS127L21. Configuration requires removing jumpers and installing zero-ohm resistors per the SBAU411 schematic.

How is clocking configured on the ADS127L21EVM-PDK?

Clocking on the ADS127L21EVM-PDK is configurable via two jumpers: JP6 selects between the onboard 32.768-MHz crystal (default) or external CMOS clock input at J14; JP7 routes either the PHI controller's 24-MHz clock or the selected EVM clock to the ADS127L21 CLK pin. The GUI software automatically detects and configures the active clock source. All clock paths include impedance-matching resistors and filtering capacitors to ensure jitter performance meets ADS127L21 specifications.