Texas Instruments ADS8327IBRSAT

Overview

ADS8327IBRSAT from Texas Instruments is a 16-bit, 500-kSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and daisy-chain capability. It delivers ±1 LSB max DNL, ±1.5 LSB max INL, 91 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 low power and stable DC performance.

For engineers reviewing the ADS8327IBRSAT datasheet, ADS8327IBRSAT pinout, ADS8327IBRSAT application, or ADS8327IBRSAT equivalent, key selection considerations include unipolar input range (0 V to VREF), 4×4 QFN-16 package thermal pad handling, EOC/INT programmable polarity, deep power-down mode (2–50 nA), and compatibility with 50 MHz SCLK for high-speed serial readout.

Technical Context

The ADS8327IBRSAT implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold, supporting both manual and auto-triggered conversion modes. Its internal 10.5–12.2 MHz conversion clock eliminates external timing components while enabling precise aperture control (5 ns delay, 10 ps jitter).

It features dual-supply operation: +VA (2.7–5.5 V) for analog circuitry and +VBD (1.65 V to 1.5×+VA) for digital I/O, ensuring level-shifting flexibility. The device supports chain-mode operation via EOC/INT/CDI pin and offers programmable status output polarity and TAG bit functionality-though TAG is disabled in ADS8327 (vs. ADS8328).

Key Specifications

Pinout & Package

The ADS8327IBRSAT is housed in a 4×4 mm, 16-pin QFN package (RSA) with an exposed thermal pad internally connected to substrate. The pad may be connected to AGND or left floating but must remain isolated from BDGND to prevent noise coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC applications.

Compared with ADS8328IBRSAT, the ADS8327IBRSAT removes MUX complexity and TAG overhead for single-input systems, reducing layout risk and firmware overhead. Against AD7682BCPZ-RL7, it provides higher throughput, integrated clocking, and superior SNR-justifying its use in time-critical, high-fidelity acquisition.

Availability

ADS8327IBRSAT is available at Aetrix Electronics and suitable for industrial process control, portable medical instrumentation, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8327IBRSAT 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 ADS8327 belongs to TI's high-performance SAR ADC product line, engineered for applications demanding low power, excellent DC accuracy, and robust serial interfacing in harsh industrial environments.

FAQ

What is the maximum SCLK frequency supported by the ADS8327IBRSAT?

The ADS8327IBRSAT supports SCLK up to 50 MHz when used solely as an I/O clock. When SCLK also serves as the conversion clock, the maximum is 21 MHz. These limits ensure reliable setup/hold timing for SDI and valid SDO output, as verified in TI's SLAS415E timing diagrams across –40°C to +85°C.

Does the ADS8327IBRSAT require an external reference voltage?

Yes, the ADS8327IBRSAT requires an external unipolar reference applied between REF+ and REF– pins. It accepts reference voltages from 0.3 V to 4.2 V depending on +VA, with optimal performance at 2.5 V (for 2.7 V supply) or 4.096 V (for 5 V supply). No internal reference is provided.

How does the CONVST pin function in the ADS8327IBRSAT?

The CONVST pin freezes the sample-and-hold and initiates conversion on the next rising edge of the internal conversion clock. It operates independently of CS, enabling global synchronization across multiple ADS8327IBRSAT devices in a system without shared chip-select timing constraints.

Can the ADS8327IBRSAT operate with different analog and I/O supply voltages?

Yes, the ADS8327IBRSAT supports independent analog (+VA: 2.7–5.5 V) and digital I/O (+VBD: 1.65 V to 1.5×+VA) supplies. This allows interfacing with 1.8 V or 3.3 V controllers while maintaining full analog performance, provided BDGND and AGND are properly partitioned.

What is the purpose of the thermal pad on the ADS8327IBRSAT QFN package?

The exposed thermal pad on the ADS8327IBRSAT's RSA package is internally connected to the silicon substrate. TI recommends connecting it to AGND via multiple vias for optimal thermal dissipation and noise control-but it must remain isolated from BDGND to prevent digital noise coupling into the analog ground plane.