Texas Instruments ADS8412EVM

Overview

ADS8412EVM from Texas Instruments is a dedicated evaluation module for the ADS8412 16-bit, 2 MSPS, parallel-interface SAR analog-to-digital converter. It provides full signal conditioning-including THS4503-based single-ended-to-differential input buffering, onboard REF3040 4.096-V reference, and SN74AHC245 digital bus transceivers-enabling immediate performance validation in high-speed data acquisition systems.

For engineers reviewing the ADS8412EVM datasheet, ADS8412EVM pinout, ADS8412EVM application, or ADS8412EVM equivalent, this page delivers verified hardware interface details, power supply configuration options (±7 V analog, 5 V/3.3 V digital), jumper-controlled memory-mapped control signal assignment, and direct access to all ADC control lines via J3 connector.

Technical Context

The ADS8412EVM implements a pseudo-bipolar differential analog input stage using the THS4503 fully differential amplifier, with common-mode voltage set to 2.0 V and optimized for 100-kHz sine-wave testing. Polypropylene capacitors (68 pF, 6800 pF) are used in the signal path to minimize distortion and preserve dynamic performance per ADS8412 specifications.

Digital interfacing supports stacking up to two EVMs via address decoder (SN74AHC138) and configurable jumpers (W2/W4/W5), assigning RD, CONVST, and RESET to distinct memory addresses. All control signals (CS, RD, CONVST, BYTE, RESET, BUSY) and 16-bit data bus (D0–D15) are accessible through standardized 0.1-inch headers P2, P3, and J3.

Key Specifications

Availability

ADS8412EVM is available at Aetrix Electronics and suitable for high-speed data acquisition, precision test equipment, and embedded DSP interface development requiring stable component supply and rapid prototyping capability.

Supply support for ADS8412EVM 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 data converters, amplifiers, and interface ICs.

The ADS8412EVM belongs to TI's precision high-speed ADC evaluation platform family, designed to accelerate system-level validation of SAR converters in industrial, instrumentation, and communications applications.

FAQ

What is the primary function of the ADS8412EVM?

The ADS8412EVM is an evaluation module specifically built to characterize and validate the ADS8412 16-bit, 2-MSPS SAR analog-to-digital converter. It provides complete analog front-end conditioning (THS4503 buffer, REF3040 reference), digital interface circuitry (SN74AHC245 transceivers, SN74AHC138 decoder), and standardized connectors (P1, P2, P3, J3) for rapid integration into test benches and prototype systems. The ADS8412EVM enables immediate functional verification without custom PCB design.

Which ADC is installed on the ADS8412EVM board?

The ADS8412EVM ships with the ADS8412IPFBT device installed-a 16-bit, 2-MSPS, parallel-output SAR ADC in a 48-pin QFP package. This is explicitly confirmed in the Bill of Materials footnote: "On ADS8412EVM, the ADS8412IPFBT is installed instead of ADS8402IPFBT." No other ADC variant is populated on this specific evaluation module.

How does the ADS8412EVM support multiple board stacking?

The ADS8412EVM supports stacking up to two units via its address decoder (U11, SN74AHC138) and jumper-configurable control signal mapping. Jumpers W2, W4, and W5 assign RD, CONVST, and RESET pulses to distinct 3-bit address codes (e.g., A[2..0] = 0x1 for RD). This allows each ADS8412EVM to respond to unique memory-mapped addresses while sharing the same data bus and DC_CS line, enabling synchronized multi-channel sampling under a single processor interface.

What power supplies are required to operate the ADS8412EVM?

The ADS8412EVM requires three independent power domains: ±7 V DC for the THS4503 amplifier stage (TP12/TP13), +5 V DC for the analog section including the ADS8412 and REF3040 (TP11), and either +3.3 V or +5 V DC for the digital buffers and decoder (TP14). These can be supplied via test points or the 10-pin J1 power connector, with W1 jumper selecting between 3.3 V or 5 V for the digital supply.

Can the ADS8412EVM be used with differential input signals?

Yes-the ADS8412EVM supports true differential analog input by modifying the input buffer circuit: install resistors R6 and R8, remove R1, and apply complementary signals to P1 pin 1 (inverting) and J4 (non-inverting). The default factory configuration uses U2 (THS4503) in single-ended-to-differential mode with VOCM fixed at 2.0 V, but the layout and BOM provide all necessary pads and components for differential reconfiguration as documented in Section 2.1 of SLAU126A.