Texas Instruments ADS8422EVM

Overview

ADS8422EVM from Texas Instruments is a full-featured evaluation module for the ADS8422 16-bit, 4-MSPS parallel-interface SAR analog-to-digital converter. It supports pseudo-bipolar fully differential analog inputs, onboard signal conditioning with THS4031/THS4032 amplifiers in 8-pin SOIC packages, and flexible reference selection (internal 4.096 V or external). Designed for high-fidelity data acquisition prototyping, it enables rapid validation of ADC performance in test benches and embedded signal chain development.

For engineers reviewing the ADS8422EVM datasheet, ADS8422EVM pinout, ADS8422EVM application, or ADS8422EVM equivalent, this module provides direct access to all ADC control signals (CONVST, BUSY, RD, CS), dual 16-bit parallel data buses (P2 and J7), configurable analog input circuitry, and TSW1100 capture card compatibility - critical for time-domain analysis, dynamic testing, and system-level integration with C5000/C6000 DSP platforms.

Technical Context

The ADS8422EVM implements a modular analog front-end with three operational amplifiers (U7, U8, U5) supporting bipolar/unipolar differential input configurations, user-selectable ±12-V amplifier supplies via SJP1/SJP2, and RC filtering (12 Ω / 1 nF default) optimized for 16-bit settling within the 70 ns sampling window. The board integrates an SN74ACH138 address decoder for memory-mapped control signal generation and supports stacking up to two EVMs via jumper-configurable address mapping (W3–W8).

Digital interfacing is provided through standardized 0.1-inch headers: P2 (32-pin data bus), P3 (control/address lines), J4 (direct ADC signal access), and J7 (TSW1100 capture card interface with buffered D0–D15 and trigger clock). Power delivery supports independent ±12 V (analog amps), +5 V (ADC/analog section), and +3.3 V/+5 V (digital logic) rails via test points TP3–TP6 or 10-pin power connector J3 with configurable jumpers (W1, W9–W11).

Key Specifications

Availability

ADS8422EVM is available at Aetrix Electronics and suitable for high-speed data acquisition prototyping, precision ADC characterization, and embedded signal chain development requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for ADS8422EVM 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 digital signal processing technologies with over 50 years of innovation in data converters and evaluation platforms.

The ADS8422EVM belongs to TI's precision data converter evaluation module family, engineered to accelerate design-in of high-speed SAR ADCs by providing validated analog front-end circuits, flexible digital interfacing, and seamless integration with TI's ecosystem (TSW1100, C5000/C6000 DSKs).

FAQ

What is the primary function of the ADS8422EVM?

The ADS8422EVM is an evaluation and demonstration platform for the ADS8422 16-bit, 4-MSPS SAR analog-to-digital converter. It provides complete signal conditioning, reference selection, and digital interface circuitry to validate ADC performance in real-world applications. Engineers use the ADS8422EVM to characterize dynamic parameters like SNR and THD, prototype custom analog front-ends, and integrate the ADS8422 into systems such as test equipment and instrumentation without designing a custom PCB.

Which ADC does the ADS8422EVM evaluate?

The ADS8422EVM evaluates the ADS8422 - a 16-bit, 4-MSPS successive approximation register (SAR) analog-to-digital converter featuring an internal 4.096-V reference, pseudo-bipolar fully differential input, and parallel 16-bit or 8-bit digital interface. All analog and digital resources on the ADS8422EVM are specifically designed to support the electrical, timing, and layout requirements of the ADS8422 IC, including its sample-and-hold behavior and reference buffer architecture.

Can the ADS8422EVM be used with the TSW1100 data capture card?

Yes, the ADS8422EVM is fully compatible with the TSW1100 data capture card via its J7 connector, which maps buffered D0–D15 and trigger clock signals. To operate in this configuration, users must provide a CONVST pulse to P3 pin 17 or J4 pin 5 and configure the ADS8422EVM for inverted BUSY triggering (W2 installed). Firmware release 1.X of the TSW1100 supports the ADS8422EVM, enabling automated data capture and PC-based analysis without custom hardware.

How is analog input configured on the ADS8422EVM?

Analog input on the ADS8422EVM is configurable for bipolar (±4 V) or unipolar (0–4 V) fully differential operation using onboard THS4031/THS4032 amplifiers in standard 8-pin SOIC footprints. Jumpers SJP1 and SJP2 select amplifier negative rail (ground or –12 V); W7 configures common-mode voltage (2.048 V or user-defined); and R16 sets DC offset (factory 2.048 V). SMA connectors J1/J2 and header P1 provide multiple signal injection paths, while RC filters (12 Ω / 1 nF default) ensure 16-bit settling within the 70 ns sampling window.

What power supplies are required for the ADS8422EVM?

The ADS8422EVM requires four independent power rails: ±12 V for the analog amplifier section (TP3/TP5 or J3 pins 1/2), +5 V for the ADC and analog reference circuitry (TP4 or J3 pin 3), and +3.3 V or +5 V for the digital logic section (TP6 or J3 pins 9/10). These voltages are selected via onboard jumpers W1, W9–W11. Factory configuration uses ±12 V, +5 V, and +5 V; switching to +3.3 V logic requires reconfiguring W1 and W9 to avoid I/O voltage mismatch with the ADS8422's digital interface.