Texas Instruments ADS8323Y/250

Overview

ADS8323Y/250 from Texas Instruments is a 16-bit, 500kSPS successive approximation register (SAR) analog-to-digital converter with internal 2.5V reference, bipolar differential input range (±2.5V), parallel byte-mode interface, and TQFP-32 package. It delivers 81dB SINAD, 94dB SFDR, and ±4 LSB integral linearity error at 500kSPS for high-speed data acquisition in motor control and optical monitoring systems.

For engineers reviewing the ADS8323Y/250 datasheet, ADS8323Y/250 pinout, ADS8323Y/250 application, or ADS8323Y/250 equivalent, key selection criteria include its 16-bit resolution with binary two's complement output, 1.6μs conversion time, 350ns acquisition time, and support for both full 16-bit and split 8-bit read cycles via BYTE control - critical for embedded real-time signal capture with microcontrollers or DSPs.

Technical Context

The ADS8323Y/250 implements a capacitor-based SAR architecture with integrated sample-and-hold amplifier and internal 2.5V bandgap reference. Its differential input stage supports ±2.5V bipolar operation referenced to AGND, with 20MHz small-signal bandwidth and 30ps aperture jitter enabling accurate sampling of fast transient signals.

Digital control uses asynchronous CMOS-level signals: CONVST initiates conversion on falling edge, BUSY indicates active conversion, and RD/CS enable 3-state parallel output. The BYTE pin selects between full-word (DB15–DB0) or byte-split (DB7–DB0 for MSB/LSB) read modes, allowing compatibility with 8-bit or 16-bit host buses without external latching logic.

Key Specifications

Pinout & Package

TQFP-32 package with exposed thermal pad (PBS marking); 5mm × 5mm body, 0.8mm pitch, JEDEC MO-220 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8322Y/250, the ADS8323Y/250 integrates the reference to save space and simplify design, while AD7682BCPZ-RL7 trades speed and interface type for footprint reduction - making ADS8323Y/250 the sole choice for 500 kSPS parallel-interface applications requiring internal reference stability.

Availability

ADS8323Y/250 is available at Aetrix Electronics and suitable for high-speed data acquisition, optical power monitoring, and motor control applications requiring stable component supply, industrial temperature range (–40°C to +85°C), and long-term production continuity.

Supply support for ADS8323Y/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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The ADS8323Y/250 belongs to TI's precision SAR ADC product line, engineered for high-throughput, low-noise digitization in industrial automation, test equipment, and real-time control systems where resolution, speed, and reliability are co-critical.

FAQ

What is the maximum sampling rate supported by the ADS8323Y/250?

The ADS8323Y/250 supports a maximum sampling rate of 500 kSPS, achieved with a 10 MHz external CLOCK signal. This rate is guaranteed across the full industrial temperature range (–40°C to +85°C) and corresponds to a 1.6 μs conversion time and 350 ns acquisition time. The device maintains specified INL, SINAD, and SFDR performance at this throughput, making ADS8323Y/250 suitable for demanding real-time applications such as motor current sampling and optical power feedback loops.

Does the ADS8323Y/250 require an external clock source?

Yes, the ADS8323Y/250 requires an external CMOS-compatible clock applied to the CLOCK pin (pin 20). The clock frequency must be between 25 kHz and 10 MHz to achieve throughput rates from 1.25 kSPS to 500 kSPS. The ADS8323Y/250 does not include an internal oscillator; timing is fully controlled by this external signal, allowing precise synchronization with host processors or system clocks. Minimum high/low times are 40 ns each, and the clock period must be ≥100 ns.

How does the BYTE pin function on the ADS8323Y/250?

The BYTE pin (pin 23) on the ADS8323Y/250 controls data output format: when LOW, DB15–DB0 present the full 16-bit result; when HIGH, DB7–DB0 output the upper 8 bits (D15–D8), enabling 8-bit bus compatibility. Two consecutive RD cycles (with BYTE toggled) read the complete word. This eliminates external multiplexers in legacy 8-bit microcontroller designs. The BYTE signal is asynchronous, and RD may remain low between BYTE transitions - a feature explicitly documented in the ADS8323Y/250 timing diagram.

Can the ADS8323Y/250 operate with an external reference voltage?

Yes, the ADS8323Y/250 supports external reference voltages from 1.5 V to 2.55 V applied to the REFIN pin (pin 31), which scales the full-scale input range linearly (e.g., 1.5 V ref yields ±1.5 V input range). When using the internal 2.5 V reference, REFIN must be tied directly to REFOUT (pin 32). The internal reference buffer can source/sink up to 10 µA and exhibits 25 ppm/°C drift - verified in the ADS8323Y/250 electrical characteristics table across –40°C to +85°C.

What is the purpose of the BUSY signal on the ADS8323Y/250?

The BUSY signal (pin 17) is an active-high digital output that goes high 25 ns after CONVST falls and remains high throughout conversion, then goes low 25 ns after the 17th clock rising edge - indicating valid data in the output register. It provides hardware handshaking for deterministic host reads without polling delays. BUSY is independent of RD/CS state and does not change during data reads; it reflects only core conversion progress, ensuring ADS8323Y/250 timing compliance in interrupt-driven or DMA-based acquisition systems.