Texas Instruments ADS8322EVM

Overview

ADS8322EVM from Texas Instruments is a single-channel, 16-bit, 500-kSPS parallel-output analog-to-digital converter evaluation module built around the ADS8322YB IC. It features onboard THS4031 input buffering, SN74AHC245 digital bus transceivers, and SN74AHC138 address decoding - enabling direct interface to 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 ADS8322EVM datasheet, ADS8322EVM pinout, ADS8322EVM application, or ADS8322EVM equivalent, this page delivers verified technical context, interface configuration options (on-chip vs. external reference), power supply routing (±12 V, +5 VA, +5 VD), jumper-controlled RD/CONVST addressing, and full signal path schematics - all essential for rapid hardware integration and firmware validation.

Technical Context

The ADS8322EVM implements a complete signal chain: a THS4031 op-amp buffer conditions the analog input before feeding the ADS8322YB's 26-pin TQFP ADC, which operates with 0–2×REFin full-scale range. The board supports both internal reference (REFout → REFin via W1) and external reference injection at J1 pin 20.

Digital interfacing uses three dedicated connectors: J2 for parallel control (A0–A2, DC_CS, CLK, BUSY), J3 for buffered 16-bit data bus (D0–D15), and J4 for direct converter control (CS, RD, CONVST, BYTE, CLK, BUSY). Jumper settings W5–W7 configure memory-mapped RD/CONVST generation and enable stacking of up to two EVMs on one bus.

Key Specifications

Availability

ADS8322EVM is available at Aetrix Electronics and suitable for precision data acquisition, DSP-based signal processing, and embedded ADC validation requiring stable component supply and full documentation traceability.

Supply support for ADS8322EVM 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 ADS8322EVM belongs to TI's precision data converter evaluation platform family, designed specifically to accelerate hardware validation, firmware development, and system-level testing of high-resolution SAR ADCs in industrial, test & measurement, and DSP-integrated applications.

FAQ

What is the primary function of the ADS8322EVM?

The ADS8322EVM is an evaluation module for the ADS8322YB 16-bit, 500-kSPS parallel-output SAR ADC. It provides a fully assembled, tested platform with input buffering (THS4031), digital isolation (SN74AHC245), address decoding (SN74AHC138), and multiple power supply interfaces - enabling immediate hardware validation and firmware development for precision data acquisition systems. The ADS8322EVM is not a standalone production component but a design and test aid.

How do I configure the ADS8322EVM to use an external reference voltage?

To use an external reference, remove jumper W1 (which shorts the on-chip REFout to REFin) and apply the external reference voltage to J1 pin 20. The ADS8322EVM schematic confirms that J1 pin 20 connects directly to the ADS8322YB's REFin pin. Ensure the external reference is stable, low-noise, and within the ADS8322YB's specified 2.0–2.75 V range. The full-scale input range then becomes 0 V to 2×V_REF.

Which DSP starter kits is the ADS8322EVM compatible with?

The ADS8322EVM is explicitly designed for seamless integration with Texas Instruments' TMS320C5000 and TMS320C6000 series Digital Signal Processor Starter Kits (DSK) via the 5-6K Interface Board. Its J1, J2, and J3 connectors match Samtec SSW/TSM headers used on that interface board, allowing direct plug-in connection and automatic memory mapping of ADC control and data registers into the DSP's address space.

Can multiple ADS8322EVM boards share the same parallel bus?

Yes - the ADS8322EVM Revision B supports stacking up to two modules on a single parallel bus. Jumper settings W5 and W6 assign different memory addresses (A[2..0] = 0x1 or 0x2 for RD; 0x3 or 0x4 for CONVST), while W7 connects DC_CS to the ADC chip select. This enables independent read and conversion-start operations per board without bus contention, as confirmed in the SLAU086A User's Guide Section 5.

What are the required power supplies for the ADS8322EVM?

The ADS8322EVM requires four distinct supplies: +5 V for the digital section (J5 pin 10 or TP16), +5 V for the analog section (J5 pin 3 or TP13), +12 V for the positive op-amp rail (J5 pin 1 or TP14), and –12 V for the negative op-amp rail (J5 pin 2 or TP15). All grounds (AGND, DGND) are internally tied at common points, and J5 provides a consolidated 10-pin power interface per the SLAU086A Table 7.