Texas Instruments ADS8323EVM

Overview

ADS8323EVM from Texas Instruments is a single-channel, 16-bit, 500-kSPS parallel-output analog-to-digital converter evaluation module built around the ADS8323YB IC. It features onboard THS4031 input buffering, SN74AHC245 digital bus transceivers, and SN74AHC138 address decoding - enabling direct interfacing with TMS320C5000/C6000 DSP starter kits via the 5-6K Interface Board. Designed for precision data acquisition in test and development environments.

For engineers reviewing the ADS8323EVM datasheet, ADS8323EVM pinout, ADS8323EVM application, or ADS8323EVM equivalent, this page delivers verified technical context, power supply configuration options (±12 V for analog amps, +5 V for analog/digital sections), jumper-controlled reference selection (on-chip REFOUT or external), parallel bus stacking capability, and full access to ADC control signals (CS, RD, CONVST, BUSY, BYTE, CLK).

Technical Context

The ADS8323EVM implements a complete signal chain for the ADS8323 SAR ADC: dual-supply THS4031 op-amps buffer analog inputs with low-noise, wideband conditioning; SN74AHCT541 and SN74AHC245 buffers isolate the 16-bit parallel data bus (D0–D15) and control lines; and SN74AHC138 provides address decoding to support up to two stacked EVMs in shared memory space. Jumper W1 selects internal or external reference at REFin; W4 configures inverting input sourcing.

Power architecture separates analog and digital domains: ±12 V applied to TP14/TP15 powers the THS4031 amplifiers; +5 VA supplies the ADC core and analog circuitry; +5 VD powers digital logic, buffers, and decoders. All analog ground (AGND) and digital ground (DGND) planes are physically isolated on the 4-layer PCB (Layers 1–4), with dedicated power planes for noise-sensitive operation.

Key Specifications

Availability

ADS8323EVM is available at Aetrix Electronics and suitable for precision data acquisition prototyping, DSP-based signal processing validation, and high-fidelity analog front-end development requiring stable component supply and documented reference design fidelity.

Supply support for ADS8323EVM 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 leader specializing in analog, embedded processing, and digital signal processing technologies, with decades of leadership in precision data converters and evaluation platforms.

The ADS8323EVM belongs to TI's precision data converter evaluation module family, engineered to accelerate hardware validation and firmware development for high-resolution, medium-speed ADC applications in test equipment, industrial sensing, and communications infrastructure.

FAQ

What is the primary function of the ADS8323EVM?

The ADS8323EVM is an evaluation module designed to demonstrate, validate, and develop firmware for the ADS8323YB 16-bit, 500-kSPS parallel-output SAR ADC. It provides full analog signal conditioning (via THS4031 op-amps), buffered 16-bit digital I/O, address decoding, and flexible power/reference configuration - enabling rapid integration with DSP platforms like the TMS320C5000/C6000 series. The ADS8323EVM serves as both a reference design and software test platform.

How do I configure the ADS8323EVM to use an external reference voltage?

To use an external reference, remove the factory-installed short on jumper W1 (pins 1–2) and install a short across pins 2–3 instead - this disconnects the internal REFOUT and routes the external voltage applied at J1 pin 20 to the ADS8323's REFin pin. Ensure the external reference is stable, low-noise, and within the ADS8323's specified 1.5 V to AVDD range. The ADS8323EVM schematic and User's Guide SLAU087A confirm this configuration path.

Which processors does the ADS8323EVM directly interface with?

The ADS8323EVM is specifically designed to plug into the 5-6K Interface Board, which mounts directly onto Texas Instruments' TMS320C5000 and TMS320C6000 Digital Signal Processor Starter Kits (DSKs). Its J2 parallel control connector maps A0–A2, DC_CS, CLK, and BUSY signals to match the DSK's memory-mapped I/O interface, allowing the ADS8323EVM to appear as a peripheral in the processor's address space without additional level-shifting or glue logic.

Can multiple ADS8323EVM boards share the same parallel bus?

Yes - the ADS8323EVM supports stacking up to two units on a single parallel bus using jumper-configurable address decoding. Jumpers W5 and W6 assign different memory-mapped addresses to generate RD and CONVST signals, while W7 connects the daughtercard chip select (DC_CS) to the ADC's CS line. This allows independent read and conversion control of each board within the same processor memory map, as documented in Table 2 and Section 5 of SLAU087A.

What power supplies are required to operate the ADS8323EVM?

The ADS8323EVM requires three independent supplies: +5 V for the digital section (applied at TP16 or J5 pin 10), +5 V for the analog section (TP13 or J5 pin 3), and dual ±12 V for the THS4031 input amplifiers (TP14/TP15 or J5 pins 1/2). All grounds must be properly tied: AGND (J1 pins 9,11,15,17), DGND (even pins on J2/J3/J4), and system ground. Failure to separate analog and digital supplies compromises SNR and THD performance.