Texas Instruments ADS8322YB/250

Overview

ADS8322YB/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 ±6 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 ADS8322YB/250 datasheet, ADS8322YB/250 pinout, ADS8322YB/250 application, or ADS8322YB/250 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts with documented performance trade-offs for precision sampling systems requiring stable 16-bit resolution and sub-2μs conversion time.

Technical Context

The ADS8322YB/250 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 2.6 V via REFIN/REFOUT pins.

Conversion is initiated by CONVST low pulse (≥20 ns), with BUSY asserted during the 1.6 μs conversion cycle. Data output uses straight-binary format on DB15–DB0, configurable for full 16-bit read or byte-wise access via BYTE control-supporting both high-speed parallel capture and resource-constrained 8-bit bus interfaces.

Key Specifications

Pinout & Package

TQFP-32 (PBS) package with exposed thermal pad; 0.8 mm pitch, 7 mm × 7 mm body, JEDEC MO-220 standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8322YB/250, ADS8326IPW sacrifices internal reference and parallel interface for smaller footprint and lower pin count, while AD7606BSTZ trades off speed and linearity for multi-channel capability-making ADS8322YB/250 optimal for single-channel, high-throughput, high-accuracy applications where reference integration and 500 kSPS are mandatory.

Availability

ADS8322YB/250 is available at Aetrix Electronics and suitable for CT scanners, high-speed data acquisition systems, and medical ultrasound receivers requiring stable component supply with guaranteed industrial temperature range (–40°C to +85°C) and long-term production continuity.

Supply support for ADS8322YB/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-performance data converters for industrial, automotive, and medical applications.

The ADS8322YB/250 belongs to TI's precision SAR ADC product line, engineered for high-speed, high-resolution digitization in noise-sensitive measurement systems where internal reference integration, low power, and deterministic timing are critical.

FAQ

What is the maximum sampling rate supported by the ADS8322YB/250?

The ADS8322YB/250 supports a maximum sampling rate of 500 kHz, corresponding to a 2 μs maximum throughput time. This is achieved with a 10 MHz external CLOCK input and requires proper timing alignment of CONVST, RD, and BYTE signals per the datasheet timing diagram. The device maintains full 16-bit accuracy and specified linearity at this rate across its industrial temperature range.

Does the ADS8322YB/250 require an external reference voltage?

No, the ADS8322YB/250 includes an internal 2.5 V bandgap reference with ±0.5% initial accuracy and 20 ppm/°C drift. When using it, REFIN must be tied directly to REFOUT. An external reference between 1.5 V and 2.6 V may be applied to REFIN if tighter tolerance or custom full-scale range is needed-but the internal reference eliminates BOM cost and layout complexity in most applications.

How does the BYTE pin affect data readout on the ADS8322YB/250?

The BYTE pin configures the ADS8322YB/250 for either full 16-bit or byte-wise parallel output. When BYTE = low, DB15–DB0 deliver all 16 bits simultaneously. When BYTE = high, DB7–DB0 output the upper byte (D15–D8), allowing 8-bit microcontrollers to read the full result in two consecutive RD cycles-reducing host interface requirements without sacrificing resolution.

What is the significance of the ±6 LSB integral linearity error specification for ADS8322YB/250?

The ±6 LSB integral linearity error (INL) means the ADS8322YB/250 deviates no more than ±6 least significant bits (±456 µV at 2.5 V reference) from the ideal transfer function across its entire 0–65535 code range. This guarantees monotonicity and supports applications like motor control and medical imaging where code transitions must be strictly ordered and predictable for closed-loop stability and diagnostic accuracy.

Can the ADS8322YB/250 operate from a single 5 V supply?

Yes, the ADS8322YB/250 operates from separate but identical +VA (analog) and +VD (digital) supplies, each rated 4.75 V to 5.25 V. While both rails typically connect to a common 5 V source, TI recommends splitting the ground paths (AGND/DGND) and using dedicated bypassing (0.1 µF ceramic + 1–10 µF bulk) per supply to prevent digital switching noise from modulating the analog conversion result.