Texas Instruments ADS8402EVM

Overview

ADS8402EVM from Texas Instruments is a dedicated evaluation module for the ADS8402 16-bit, 1.25 MSPS, parallel-interface SAR analog-to-digital converter. It provides full signal conditioning-including THS4503 differential input buffer, REF3040 onboard reference, and SN74AHC245 digital bus transceivers-and supports direct interfacing to TMS320C5000/C6000 DSP platforms via 5-6K interface card.

For engineers reviewing the ADS8402EVM datasheet, ADS8402EVM pinout, ADS8402EVM application, or ADS8402EVM equivalent, this module serves as a validated reference design, prototype platform, and software test environment-enabling rapid validation of high-speed ADC performance, analog front-end optimization, and memory-mapped control signal timing in embedded data acquisition systems.

Technical Context

The ADS8402EVM implements a pseudo-bipolar differential analog input stage using the THS4503 fully differential amplifier configured for single-ended-to-differential conversion with 2.0 V common-mode voltage. Input path uses WIMA polypropylene capacitors (68 pF and 6800 pF) to preserve dynamic performance including SNR, THD, and SFDR per ADS8402 specifications.

Digital interface includes Samtec SSW/TSM dual-row headers (P2, P3, J3), address-decoded control logic via SN74AHC138, and three-state buffered data bus (D0–D15) with SN74AHC245 transceivers. Power architecture separates ±7 V analog amplifier rails, +5 V analog section, and selectable +3.3 V/+5 V digital supply via jumper W1 on J1 connector.

Key Specifications

Availability

ADS8402EVM is available at Aetrix Electronics and suitable for high-speed data acquisition, DSP-based signal processing, and precision analog front-end prototyping requiring stable component supply and documented TI reference implementation.

Supply support for ADS8402EVM 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, delivering analog and embedded processing solutions across industrial, automotive, and communications markets.

The ADS8402EVM belongs to TI's precision data converter evaluation platform family, designed specifically to accelerate development of high-fidelity, high-throughput analog-to-digital signal chains for test equipment, medical imaging, and real-time control applications.

FAQ

What is the primary function of the ADS8402EVM?

The ADS8402EVM is an evaluation module built to characterize and prototype with the ADS8402 16-bit, 1.25 MSPS SAR analog-to-digital converter. It integrates signal conditioning, reference generation, digital buffering, and flexible power routing-enabling immediate hardware validation without custom PCB design. The ADS8402EVM supports both standalone testing and integration into TI's TMS320C5000/C6000 DSP ecosystems via the 5-6K interface card.

Which ADC variants does the ADS8402EVM support besides ADS8402?

The ADS8402EVM is mechanically and electrically compatible with ADS8406IPFBT (1.25 MSPS) and ADS8412IPFBT (2 MSPS) - all sharing the same 48-pin QFP package and pinout. The board ships with ADS8402IPFBT installed, but users may substitute ADS8406 or ADS8412 per Table 9 BOM notes and schematic compatibility. Each variant retains identical analog interface, reference, and digital control architecture on the ADS8402EVM.

How is analog input configured on the ADS8402EVM?

The ADS8402EVM uses the THS4503 differential amplifier in unity-gain, single-ended-to-differential configuration by default (U2), with common-mode voltage set to 2.0 V via REF3040 and R9 potentiometer. Single-ended signals connect to P1 pin 2 (+IN) or J2 SMA; differential mode requires installing R6/R8 and removing R1, then applying complementary signals to P1 pin 1 (−IN) and J4 SMA. Input path uses WIMA FKP2 polypropylene capacitors for minimal distortion.

Can multiple ADS8402EVM boards be stacked in one system?

Yes - the ADS8402EVM supports stacking up to two units in processor memory using address decoding. Jumpers W2, W4, and W5 configure SN74AHC138 outputs to assign RD, CONVST, and RESET signals to distinct memory addresses (A[2..0] = 0x1 through 0x6). Chip select (CS) must be controlled externally (e.g., GPIO or grounded) since it is not memory-mapped. This enables synchronized multi-channel sampling without bus contention.

What power supply requirements must be met to operate the ADS8402EVM?

The ADS8402EVM requires four isolated supplies: ±7 V DC for THS4503 amplifier rails (TP12/TP13), +5 V DC for analog section including ADS8402 and REF3040 (TP11), and +3.3 V or +5 V DC for digital buffers and logic (TP14, selected via W1 jumper on J1). All supplies must be low-noise and well-decoupled; improper rail sequencing or excessive ripple degrades ADC SNR and THD performance on the ADS8402EVM.