Texas Instruments ADS8323Y/250G4

Overview

ADS8323Y/250G4 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-fidelity data acquisition in motor control feedback loops.

For engineers reviewing the ADS8323Y/250G4 datasheet, ADS8323Y/250G4 pinout, ADS8323Y/250G4 application, or ADS8323Y/250G4 equivalent, key selection criteria include its 16-bit resolution with no missing codes, 350ns acquisition time, 1.6μs conversion time, CMOS-compatible parallel interface timing, and industrial temperature range (–40°C to +85°C) operation.

Technical Context

The ADS8323Y/250G4 implements a capacitor-based SAR architecture with integrated sample-and-hold amplifier and dual-buffered internal 2.5V reference. Its differential input stage supports true bipolar operation (±VREF) with 70dB common-mode rejection at DC and 50dB at 1MHz, enabling direct connection to precision op-amp front-ends without level-shifting circuitry.

Conversion is externally clocked (25kHz–10MHz), initiated by CONVST falling edge, and signaled via BUSY output. Data readout supports full 16-bit parallel transfer or two-cycle 8-bit byte mode using BYTE control, with RD/CS-synchronized 3-state drivers ensuring bus compatibility with microcontrollers and DSPs.

Key Specifications

Pinout & Package

TQFP-32 package with 0.8mm pitch, 7mm × 7mm body, and exposed thermal pad (PBS marking). Pin 1 is DB15 (MSB); pins 29–30 are NC; pin 32 is REFOUT requiring 0.1μF ceramic bypass to AGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8322Y/250G4, the ADS8323Y/250G4 reduces system component count via integrated reference and simplifies timing with dedicated BUSY signaling; versus AD7682BCPZ-RL7, it delivers double the throughput and deterministic parallel readout essential for real-time control loops.

Availability

ADS8323Y/250G4 is available at Aetrix Electronics and suitable for motor control feedback systems, optical transceiver calibration, automated test equipment channels, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges.

Supply support for ADS8323Y/250G4 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADS8323Y/250G4 belongs to TI's precision SAR ADC product line, engineered specifically for high-speed, high-accuracy industrial data acquisition where resolution, linearity, and thermal stability are critical.

FAQ

What is the maximum sampling rate supported by the ADS8323Y/250G4?

The ADS8323Y/250G4 supports a maximum sampling rate of 500kSPS when driven by a 10MHz external CLOCK signal. This rate is achieved with guaranteed 16-bit performance, including ±4 LSB integral linearity error and 81dB SINAD, across the full industrial temperature range (–40°C to +85°C). Lower rates down to 1.25kSPS are supported using slower clocks.

Does the ADS8323Y/250G4 require an external reference voltage?

No, the ADS8323Y/250G4 includes an internal 2.5V bandgap reference with 25ppm/°C drift and 0.6mV line regulation. When using this reference, REFIN must be connected directly to REFOUT (pin 31 to pin 32), and a 0.1μF ceramic capacitor must be placed from REFOUT to AGND. An external reference between 1.5V and 2.55V may be used instead if higher accuracy or different full-scale range is required.

How does the BYTE pin function in the ADS8323Y/250G4 parallel interface?

The BYTE pin on the ADS8323Y/250G4 configures the 16-bit parallel output for 8-bit bus compatibility. When BYTE = LOW, all 16 bits appear simultaneously on DB15–DB0. When BYTE = HIGH, only the upper 8 bits (DB15–DB8) are routed to DB7–DB0, requiring two consecutive RD cycles to read the full word-first with BYTE low (LSB byte), then BYTE high (MSB byte).

What is the purpose of the BUSY signal in the ADS8323Y/250G4?

The BUSY signal on the ADS8323Y/250G4 is an active-high digital output that indicates conversion status. It goes high within 25ns after CONVST falls and remains high throughout the 1.6μs conversion cycle. BUSY transitions low 25ns after conversion completion, signaling that valid data are latched and ready for readout via RD/CS. This eliminates need for fixed delay timing in firmware.

Can the ADS8323Y/250G4 accept single-ended analog inputs?

Yes, the ADS8323Y/250G4 supports single-ended operation: tie –IN to a stable common-mode voltage (e.g., AVDD/2 or AGND), and apply the signal to +IN. The full-scale range becomes VREF centered on that common-mode voltage (e.g., 0V to +2.5V with –IN = 0V). However, differential mode is preferred for its 70dB CMRR and superior noise immunity in electrically noisy environments.