Texas Instruments ADS8322Y/2K

Overview

ADS8322Y/2K 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 - enabling high-fidelity data acquisition in medical CT scanners and industrial test equipment.

For engineers reviewing the ADS8322Y/2K datasheet, ADS8322Y/2K pinout, ADS8322Y/2K application, or ADS8322Y/2K equivalent, this page provides verified technical context, validated pin functions, confirmed timing behavior (1.6 μs conversion time, 350 ns acquisition), real-world application constraints (±0.1 V to +VA+0.1 V +IN range, –0.1 V to +0.5 V –IN range), and two rigorously cross-checked alternative parts for system-level design continuity.

Technical Context

The ADS8322Y/2K implements a capacitor-based SAR architecture with inherent sample-and-hold, driven by an external CMOS clock (25 kHz–10 MHz). Its internal 2.5V bandgap reference is double-buffered and supports external reference operation from 1.5 V to 2.55 V via REFIN.

Conversion is initiated by CONVST low pulse (≥20 ns), with BUSY asserted high during the 16-clock-cycle process. Data output uses straight-binary format on DB15–DB0, configurable for full 16-bit read or byte-wise 8-bit reads via BYTE control - supporting both high-speed parallel bus interfacing and resource-constrained 8-bit microcontroller systems.

Key Specifications

Pinout & Package

TQFP-32 (PBS) package with 0.8 mm pitch, exposed thermal pad, and JEDEC-standard footprint - compatible with standard reflow profiles (MSL Level-3, 260°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8322Y/2K, ADS8326IPW trades throughput and parallel interface for lower power and smaller footprint, while AD7606BSTZ adds channel count and flexibility at the expense of speed and package size - making ADS8322Y/2K optimal for single-channel, high-speed, space-constrained industrial and medical systems.

Availability

ADS8322Y/2K is available at Aetrix Electronics and suitable for CT scanners, high-speed data acquisition systems, and medical diagnostic equipment requiring stable component supply throughout extended production lifecycles.

Supply support for ADS8322Y/2K 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 connectivity technologies, with over 50 years of innovation in precision data converters and industrial-grade ICs.

The ADS8322Y/2K belongs to TI's precision SAR ADC product line, engineered for high-speed, high-resolution digitization in demanding medical, test, and industrial applications where accuracy, low noise, and reliability are non-negotiable.

FAQ

What is the maximum sampling rate supported by the ADS8322Y/2K?

The ADS8322Y/2K supports a maximum sampling rate of 500 kHz, achieved with a 10 MHz external CLOCK input and proper timing alignment per the datasheet's tCONV (1.6 μs) and tACQ (350 ns) specifications. This rate is fully characterized across the –40°C to +85°C temperature range and requires strict adherence to the 20 ns minimum CONVST pulse width and 100 ns minimum CLOCK period.

Does the ADS8322Y/2K require an external reference voltage?

No, the ADS8322Y/2K includes an internal 2.5 V bandgap reference that is factory-trimmed and temperature-compensated. When using it, REFIN must be tied directly to REFOUT with a 0.1 μF ceramic capacitor on REFOUT. An external reference between 1.5 V and 2.55 V may be applied to REFIN if higher accuracy or different full-scale range is needed - but the internal reference remains active unless explicitly disabled via external configuration.

How does the BYTE pin function in the ADS8322Y/2K interface?

The BYTE pin on the ADS8322Y/2K configures the parallel data output mode: when BYTE = 0, all 16 bits appear simultaneously on DB15–DB0; when BYTE = 1, only the upper 8 bits (D15–D8) are placed on DB7–DB0, enabling 8-bit microcontroller interfacing. Two consecutive RD pulses (first with BYTE = 0, second with BYTE = 1) are required to read the full word in byte mode - and BUSY must be monitored to avoid reading during conversion.

What are the absolute voltage limits for the +IN and –IN pins of the ADS8322Y/2K?

The +IN pin tolerates –0.1 V to +VA + 0.1 V (i.e., –0.1 V to +5.1 V at VA = 5 V), while the –IN pin is restricted to –0.1 V to +0.5 V. Exceeding these ranges risks linearity degradation or damage. The unipolar input span is defined as +IN – (–IN) = 0 to +2VREF (0 to +5 V), and maintaining –IN within its narrow window ensures proper common-mode rejection and avoids clipping in differential sampling configurations.

Is the ADS8322Y/2K pin-compatible with other members of the ADS832x family?

The ADS8322Y/2K shares the same TQFP-32 (PBS) package and pinout with ADS8322Y, ADS8322YB, and ADS8326 variants - including identical placement of CONVST, BUSY, RD, CS, CLOCK, +IN, –IN, REFOUT, REFIN, and DB0–DB15. However, ADS8322YB offers improved ±6 LSB INL and ±3 LSB DNL, while ADS8326 uses SPI instead of parallel interface - so functional compatibility requires verification of timing, reference, and interface requirements for each target application.