Texas Instruments ADS8329IBRSATG4

Overview

ADS8329IBRSATG4 from Texas Instruments is a low-power, 16-bit, 1-MSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, serial SPI/DSP interface, and daisy-chain capability. It features ±1.75 LSB max INL, ±1 LSB max DNL, 93 dB SNR at 10 kHz, and operates from 2.7 V to 5.5 V analog supply. It is used in high-precision industrial data acquisition systems requiring stable DC performance and low power.

For engineers reviewing the ADS8329IBRSATG4 datasheet, ADS8329IBRSATG4 pinout, ADS8329IBRSATG4 application, or ADS8329IBRSATG4 equivalent, key selection considerations include unipolar input range (0 V to VREF), internal CCLK generation, programmable EOC/INT polarity, deep power-down mode (4 nA), and QFN-16 (RSA) package compatibility with space-constrained PCB layouts.

Technical Context

The ADS8329IBRSATG4 implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its conversion timing is synchronized to an internal 22.3–24.5 MHz CCLK (derived from SCLK), enabling deterministic 18-cycle conversion time and 3-cycle acquisition window.

It supports SPI- and TMS320-DSP-compatible serial protocols via FS/CS and SCLK, with configurable status output (EOC/INT/CDI) and optional TAG bit for multi-device chain identification. The device uses separate analog (+VA) and digital I/O (+VBD) supplies, allowing mixed-voltage system interfacing down to +VBD = 1.65 V.

Key Specifications

Pinout & Package

ADS8329IBRSATG4 is packaged in a 4 × 4 mm, 16-pin QFN (RSA) with exposed thermal pad. The pad is internally connected to substrate and may be tied to AGND or left floating-must be isolated from BDGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8329IRSAT, ADS8329IBRSATG4 delivers tighter DC accuracy critical for closed-loop control, while versus ADS8330IBRSAT it eliminates unused MUX circuitry-reducing power by 0.2 mA and simplifying firmware for single-input systems.

Availability

ADS8329IBRSATG4 is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and precision data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADS8329IBRSATG4 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 90 years of innovation in precision signal chain solutions.

The ADS8329IBRSATG4 belongs to TI's low-power, high-speed SAR ADC family designed for industrial, medical, and test equipment demanding 16-bit accuracy, sub-100 ps aperture jitter, and flexible power management without sacrificing throughput.

FAQ

What is the maximum sampling rate of the ADS8329IBRSATG4 under 3-V analog supply conditions?

The ADS8329IBRSATG4 achieves 1 MSPS sampling rate when +VA is between 3 V and 3.6 V. At +VA = 2.7 V, the maximum rate drops to 900 kSPS due to internal timing constraints. This behavior is guaranteed across the full –40°C to +85°C operating range and is documented in the Electrical Characteristics table for low-voltage operation. The ADS8329IBRSATG4 maintains full 16-bit performance at both rates.

Does the ADS8329IBRSATG4 require an external reference voltage source?

Yes, the ADS8329IBRSATG4 requires an external reference applied between REF+ and REF– pins. It supports reference voltages from 0.3 V to +VA, with typical configurations using 2.5 V (at +VA = 3 V) or 5 V (at +VA = 5 V). The reference input has 40 kΩ impedance and must be decoupled locally; REF– must connect directly to AGND via a dedicated via to ensure optimal PSRR and noise rejection.

Can the ADS8329IBRSATG4 operate in daisy-chain mode with other ADCs, and what is required to enable it?

Yes, the ADS8329IBRSATG4 supports daisy-chain mode using the EOC/INT/CDI pin as chain data input and SDO as chain data output. To enable chaining, configure the device for CDI mode via SDI command, tie CS of downstream devices to SDO of upstream devices, and use a common SCLK and CONVST. The ADS8329IBRSATG4 propagates valid data with 16 ns delay (td(SDO-CDI)) in chain mode, ensuring deterministic multi-device synchronization.

What are the power-supply requirements for the ADS8329IBRSATG4's analog and digital sections?

The ADS8329IBRSATG4 requires two independent supplies: +VA (2.7–5.5 V) for the analog core and +VBD (1.65–5.5 V) for digital I/O. +VA powers the SAR array, reference buffer, and input stage; +VBD sets logic thresholds for SDI/SDO/FS/CS. Separation prevents digital switching noise from degrading analog performance. Typical use pairs +VA = 3 V and +VBD = 1.8 V to achieve 15.5 mW total power at 1 MSPS.

How does the programmable polarity of the EOC/INT pin function in the ADS8329IBRSATG4?

The EOC/INT pin on the ADS8329IBRSATG4 can be configured via serial command to assert active-high or active-low during end-of-conversion or interrupt events. When set as EOC (default), it goes low during conversion and high when data is ready. As INT, it pulses low for a programmable duration after conversion completion. Polarity inversion is supported in both modes, allowing direct interface with ARM, DSP, or FPGA interrupt controllers without external logic.