Texas Instruments ADS8322Y/250

Overview

ADS8322Y/250 from Texas Instruments is a 16-bit, 500kHz successive approximation register (SAR) analog-to-digital converter with integrated 2.5V reference, unipolar input range (0 to +2VREF), CMOS-compatible parallel interface, and TQFP-32 package. It delivers ±8 LSB integral linearity error, 81 dB SINAD at 100 kHz, and 85 mW power dissipation at full throughput-targeted for high-speed medical imaging and test instrumentation signal chains.

For engineers reviewing the ADS8322Y/250 datasheet, ADS8322Y/250 pinout, ADS8322Y/250 application, or ADS8322Y/250 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for industrial-grade data acquisition systems requiring stable 16-bit resolution at 500 kSPS.

Technical Context

The ADS8322Y/250 implements a capacitor-based SAR architecture with inherent sample-and-hold, driven by an external 20× oversampled clock (e.g., 10 MHz for 500 kHz throughput). Its internal 2.5V bandgap reference is double-buffered and supports external reference operation from 1.5 V to 2.55 V.

It features a BYTE-selectable 8-bit bus mode (two-cycle read) or full 16-bit parallel output in straight binary format, with CMOS-level digital I/O, BUSY flag synchronization, and CONVST-triggered conversion start. Acquisition time is 350 ns, aperture jitter is 20 ps, and small-signal bandwidth reaches 30 MHz.

Key Specifications

Pinout & Package

TQFP-32 (PBS) package with 0.8 mm pitch, exposed thermal pad, and industrial –40°C to +85°C operating range. Pin 1 marked via corner notch; RoHS-compliant, MSL Level-3 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8322Y/250, ADS8326IPW trades parallel interface and internal reference for smaller footprint and SPI flexibility, while AD7606BSTZ offers channel multiplexing and dual-interface support at reduced per-channel speed-neither is pin-compatible, but both serve overlapping high-precision industrial acquisition roles.

Availability

ADS8322Y/250 is available at Aetrix Electronics and suitable for CT scanners, high-speed data acquisition systems, and medical ultrasound receivers requiring stable component supply across extended production lifecycles.

Supply support for ADS8322Y/250 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 high-reliability ICs, with decades of expertise in precision data converters and industrial signal chain solutions.

The ADS8322Y/250 belongs to TI's high-speed precision SAR ADC product line, engineered for applications demanding 16-bit resolution, sub-10 LSB linearity, and robust operation in medical and test equipment environments.

FAQ

What is the maximum sampling rate of the ADS8322Y/250?

The ADS8322Y/250 achieves a maximum sampling rate of 500 kHz under specified conditions: +VA = +5 V, fCLK = 20 × fSAMPLE (i.e., 10 MHz clock), and industrial temperature range. This rate is guaranteed-not typical-and supported by 1.6 μs conversion time and 350 ns acquisition time.

Does the ADS8322Y/250 require an external clock source?

Yes, the ADS8322Y/250 requires an external CMOS-compatible clock applied to the CLOCK pin to control conversion timing. The clock frequency must be between 25 kHz and 10 MHz to sustain throughput from 1.25 kSPS to 500 kSPS; minimum HIGH/LOW times are 40 ns each.

Can the ADS8322Y/250 operate with an external reference voltage?

Yes, the ADS8322Y/250 supports external reference voltages from 1.5 V to 2.55 V applied to the REFIN pin. When using an external reference, REFOUT must remain unconnected; the internal 2.5 V reference is disabled, and full-scale input span becomes 2 × VREF.

What is the meaning of the "Y" suffix in ADS8322Y/250?

The "Y" suffix in ADS8322Y/250 denotes the standard performance grade: ±8 LSB integral linearity error and ±2 mV offset error over temperature. It distinguishes the part from the higher-accuracy ADS8322YB variant (±6 LSB INL, ±1 mV offset), both in TQFP-32 packaging.

How is data read from the ADS8322Y/250 in byte-mode?

In byte-mode, set BYTE = high to output upper 8 bits (DB15–DB8) on DB7–DB0; first assert RD low while BYTE is low to read lower 8 bits (DB7–DB0), then toggle BYTE high and reassert RD low to read upper 8 bits-both reads require CS low and occur within one conversion cycle.