Texas Instruments ADS1209EVM

Overview

ADS1209EVM from Texas Instruments is a dedicated evaluation module for the ADS1209 two-channel delta-sigma (ΔΣ) modulator, designed to interface directly with the AMC1210 digital filter for high-accuracy current measurement and resolver position decoding in motor control systems. It delivers 86-dB dynamic performance, supports ±0.92 × VREF analog input range with +2.5-V internal reference, and operates from single 5-V AVDD and 2.7–5.5-V BVDD supplies.

For engineers reviewing the ADS1209EVM datasheet, ADS1209EVM pinout, ADS1209EVM application, or ADS1209EVM equivalent, this page provides verified technical context, J1 analog terminal mapping, J2 digital/power connector layout, full BOM traceability, and design guidance for integrating the ADS1209EVM with FPGA-based or AMC1210-based digital filtering architectures.

Technical Context

The ADS1209EVM implements a complete signal chain for evaluating the ADS1209 modulator, including screw-terminal analog inputs (J1) for differential CHA+/CHA− and CHB+/CHB−, onboard R/C anti-aliasing filters (4.7 nF), and internal reference configuration (REFOUT tied to REFINA/REFINB). It uses the ADS1209's internal oscillator (CLKIN/CLKSEL tied to BVDD) and supports unipolar differential operation with common-mode voltage fixed at +2.5 V.

Digital outputs (OUTA, OUTB, CLKOUT1, CLKOUT2, MDAT1, MDAT2) are routed to a 9-pin female sub-D connector (J2), enabling direct connection to the AMC1210 EVM or FPGA logic. Power delivery includes separate AVDD (+5 V) and BVDD (2.7–5.5 V) rails, decoupled by 4.7-μF X5R ceramic capacitors (C15/C16) and 0.1-μF X7R arrays (C7–C13).

Key Specifications

Availability

ADS1209EVM is available at Aetrix Electronics and suitable for motor control prototyping, resolver feedback evaluation, and high-precision current sensing development requiring stable component supply and full documentation traceability.

Supply support for ADS1209EVM 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-performance data conversion technologies.

The ADS1209EVM belongs to TI's Precision Analog Evaluation Module family, engineered specifically to accelerate validation of delta-sigma modulators in industrial motor control and position-sensing applications.

FAQ

What is the primary function of the ADS1209EVM?

The ADS1209EVM is an evaluation module designed exclusively to prototype and validate the ADS1209 two-channel delta-sigma modulator. It provides accessible analog inputs via screw terminals (J1), digital outputs via a 9-pin D-sub connector (J2), and preconfigured internal reference routing - all to simplify integration with the AMC1210 digital filter or FPGA-based decimation logic. The ADS1209EVM does not perform standalone A/D conversion; it requires external digital filtering to produce usable output codes.

Can the ADS1209EVM operate without the AMC1210?

Yes, the ADS1209EVM can operate independently of the AMC1210. Its digital outputs (OUTA, OUTB, CLKOUT1/2, MDAT1/2) are fully accessible via J2 and compatible with FPGA or ASIC logic implementing custom decimation filters. The ADS1209EVM uses its internal oscillator and reference, so no external clock or reference components are required for basic modulator operation - though digital filtering remains necessary to extract final 16-bit values from the bitstream.

What are the voltage limits for analog inputs on the ADS1209EVM?

The ADS1209EVM accepts differential analog inputs within ±0.92 × VREF centered at +2.5 V common mode. With the internal 2.5-V reference enabled, this corresponds to a valid input range of +0.125 V to +4.875 V per channel. Exceeding these limits risks saturation, incorrect 1s-density modulation, or potential damage. The User's Guide explicitly cautions against applying signals outside 0 V to 5 V to J1 - the ADS1209EVM must never see negative or >5-V analog inputs.

How is power delivered to the ADS1209EVM?

Power is applied exclusively through the 9-pin D-sub connector J2: Pin 4 supplies +5 V AVDD (analog domain), Pin 3 supplies +2.7 to +5.5 V BVDD (digital/modulator domain), and Pins 1 and 5 provide ground returns. Linear regulation and current limiting are strongly recommended. No onboard voltage regulation is present - all supplies must be externally sourced and stable. Standalone operation is supported, but no alternate power entry points (e.g., headers or USB) exist on the ADS1209EVM PCB.

Does the ADS1209EVM include a bill of materials and schematic?

Yes, the official ADS1209EVM User's Guide (SBAU167) includes a complete bill of materials (Table 3), full schematic diagram (Appendix A), and PCB layout drawing (Figure 3). All passive components (e.g., C2/C6 = 4700-pF X7R 0603; R1–R4 = 47-Ω 1% 0603; U1 = ADS1209SPW) are explicitly listed with manufacturer part numbers (Murata, Yageo, TI). The schematic shows exact routing of J1 analog paths, J2 digital/power connections, and internal ADS1209 pin assignments - enabling full design replication or modification.