Texas Instruments ADS8284IBRGCR

Overview

ADS8284IBRGCR from Texas Instruments is an 18-bit, 1-MSPS pseudo-bipolar differential SAR ADC with integrated on-chip ADC driver (OPA), 4-channel differential multiplexer, internal 4-V reference, and 18-/16-/8-bit parallel interface. It supports ±4-V input range with 2-V common-mode, delivers 98.4 dB SNR at 2 kHz, and operates across –40°C to 85°C in medical CT scanners and high-speed data acquisition systems.

For engineers reviewing the ADS8284IBRGCR datasheet, ADS8284IBRGCR pinout, ADS8284IBRGCR application, or ADS8284IBRGCR equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (64-pin QFN, 9 mm × 9 mm), real-world application constraints, and two documented alternative parts for system-level design continuity.

Technical Context

The ADS8284IBRGCR integrates a 4-channel differential analog multiplexer with auto/manual scan modes, a matched OPA-based ADC driver optimized for 50-Ω source impedance, and a zero-latency SAR core. Its pseudo-bipolar architecture accepts ±4-V differential inputs referenced to VCMO (REFIN/2), enabling direct interfacing with bipolar sensor outputs without external level-shifting circuitry.

Timing-critical operation relies on synchronized CONVST-triggered sampling, BUSY-driven channel sequencing via MXCLK, and configurable bus width (18/16/8-bit) controlled by BYTE and BUS18_16 pins. The device uses separate analog (+VA/AGND), digital (+VBD/BGND), and OPA (VCC/VEE) supply domains to maintain 97.5–98.4 dB SNR and –119 dB THD at full throughput.

Key Specifications

Pinout & Package

ADS8284IBRGCR is housed in a thermally enhanced 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per TI SLAS628A datasheet Rev. April 2014.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8284IBRGCR, ADS8484IRGCT offers higher speed and true differential input but requires external signal conditioning, while ADS8381IPWR reduces size and power at the expense of throughput and integration - making ADS8284IBRGCR optimal for balanced multi-channel, medium-speed, integrated-system designs.

Availability

ADS8284IBRGCR is available at Aetrix Electronics and suitable for medical imaging systems, automated test equipment, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8284IBRGCR 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 signal-chain solutions.

The ADS8284IBRGCR belongs to TI's high-performance SAR ADC product line, designed specifically for integrated analog front-ends in medical, test, and industrial systems demanding resolution, speed, and on-chip signal conditioning.

FAQ

What does "Not Recommended for New Designs" mean for ADS8284IBRGCR?

The "Not Recommended for New Designs" designation indicates Texas Instruments no longer promotes ADS8284IBRGCR for newly initiated projects due to newer alternatives like ADS8484 or ADS868x families. However, ADS8284IBRGCR remains in active production, supported with full datasheet documentation, and available through authorized distributors including Aetrix Electronics for legacy system maintenance and existing production ramps.

Does ADS8284IBRGCR require external decoupling capacitors, and where should they be placed?

Yes, ADS8284IBRGCR requires specific decoupling: a 0.1-μF capacitor between REFIN and REFM (Pin 10–8/9), a 1-μF capacitor between REFOUT and REFM (Pin 11–8/9), and 0.1-μF capacitors on each +VA and +VBD supply rail near their respective pins. These placements are mandatory to stabilize the internal reference and suppress switching noise, as confirmed in Section 6.5 and Figure 32 of the SLAS628A datasheet.

How does the AUTO/MANUAL multiplexer mode work on ADS8284IBRGCR?

ADS8284IBRGCR supports both modes: when AUTO = 1 (Pin 33 high), the multiplexer auto-scans channels using MXCLK edges and C2/C1 to set final channel count; when AUTO = 0, manual addressing uses C3/C2/C1 as 3-bit channel select. This dual-mode flexibility allows ADS8284IBRGCR to serve both sequential sensor polling and selective channel access in the same hardware platform.

Can ADS8284IBRGCR operate with a 3.3-V digital supply while using a 5-V analog supply?

Yes, ADS8284IBRGCR supports mixed-supply operation: +VBD may be 3.3 V (min 2.7 V, max 5.25 V) while +VA is 5 V (4.75–5.25 V), as specified in Section 6.3. This configuration is validated in timing tables (Sections 6.6 and 6.7) and electrical characteristics, enabling compatibility with 3.3-V microcontrollers without compromising analog performance or SNR.

What is the purpose of the PD-RBUF pin on ADS8284IBRGCR, and how does it affect system power?

PD-RBUF (Pin 21) controls the buffered reference output (BUF-REF). When driven high, it powers down the BUF-REF buffer, reducing VCC current from ~11.65 mA to 10 μA - cutting total system power by ~11.6 mA. This feature allows dynamic power scaling in battery-operated or thermally constrained applications where the buffered reference is not continuously needed.