Texas Instruments ADS8484IRGZR

Overview

ADS8484IRGZR from Texas Instruments is an 18-bit, 1.25-MSPS pseudo-bipolar fully differential SAR analog-to-digital converter with integrated 4.096-V reference, ±1.5 LSB typical INL, 98.5 dB SNR, and zero-latency parallel interface. It operates over –40°C to +85°C in medical instrumentation and high-accuracy data acquisition systems.

For engineers reviewing the ADS8484IRGZR datasheet, ADS8484IRGZR pinout, ADS8484IRGZR application, or ADS8484IRGZR equivalent, key selection criteria include its 48-pin QFN package, 18-/16-/8-bit bus flexibility, ±0.5-mV offset error, ±0.1%FSR gain error, and support for microcontroller interfacing via BUSY-triggered read cycles.

Technical Context

The ADS8484IRGZR implements a capacitor-based SAR architecture with inherent sample-and-hold, internal conversion clock generation, and zero-latency operation. Its pseudo-bipolar differential input range spans ±V_REF (±4.096 V), supported by dedicated +IN/–IN pins and REFM-referenced REFIN/REFOUT circuitry.

It supports three parallel bus configurations-18-bit (DB[17:0]), 16-bit (two-cycle read), and 8-bit (three-cycle read)-controlled by BUS18/16 and BYTE inputs, with BUSY signaling conversion status and RD/CS enabling synchronized data capture.

Key Specifications

Pinout & Package

ADS8484IRGZR is housed in a 48-pin 7×7 mm QFN package (RGZ) with exposed thermal pad requiring PCB soldering for thermal and mechanical integrity. Pin functions are validated per TI SLAS511 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8482IRGZR and ADS8382IPF, the ADS8484IRGZR uniquely combines 18-bit resolution, 1.25 MSPS speed, integrated reference, and 48-pin QFN packaging-enabling compact, high-fidelity data acquisition without external reference or resolution trade-offs.

Availability

ADS8484IRGZR is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, transducer interface, and high-accuracy data acquisition systems requiring stable component supply and long-term industrial temperature support.

Supply support for ADS8484IRGZR 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 delivering analog and embedded processing solutions with emphasis on precision, reliability, and energy efficiency.

The ADS8484 belongs to TI's high-speed SAR ADC product line, designed specifically for applications demanding 18-bit accuracy, zero-latency parallel output, and integrated reference in space-constrained industrial and medical systems.

FAQ

What is the maximum sample rate supported by the ADS8484IRGZR?

The ADS8484IRGZR supports a maximum throughput rate of 1.25 MSPS, with a guaranteed conversion time of 610 ns. This enables continuous sampling of signals with up to ~600 kHz bandwidth while maintaining full 18-bit resolution and no missing codes across the industrial temperature range.

Does the ADS8484IRGZR require an external reference voltage?

No-the ADS8484IRGZR integrates a precision 4.096-V internal reference with ±6 ppm/°C drift and 120-ms startup time. It can operate autonomously using this reference, though it also supports external reference input (3.0–4.2 V) via the REFIN pin for applications requiring tighter tolerance or different voltage levels.

How does the BUS18/16 and BYTE pin configuration affect data readout on the ADS8484IRGZR?

On the ADS8484IRGZR, BUS18/16 = 0 configures DB[17:0] for full 18-bit parallel output; BUS18/16 = 1 with BYTE = 0 reads D[9:2] on DB[9:2]; BYTE = 1 reads D[9:2] on DB[17:10]. This allows seamless interfacing with 8-bit microcontrollers without external multiplexing logic.

What is the significance of the pseudo-bipolar input architecture in the ADS8484IRGZR?

The pseudo-bipolar input of the ADS8484IRGZR accepts differential signals ranging from –V_REF to +V_REF (i.e., –4.096 V to +4.096 V), centered at REFM. Unlike true bipolar inputs, it does not support negative supply rails-instead relying on REFM as reference ground, simplifying power design while preserving full-scale differential dynamic range.

Can the ADS8484IRGZR be used in systems with mixed 3.3-V and 5-V digital supplies?

Yes-the ADS8484IRGZR supports independent digital I/O supply (+VBD) from 2.7 V to 5.25 V, allowing direct interface with both 3.3-V and 5-V microcontrollers. Its CMOS-compatible inputs (VIH = +VBD – 1 V, VIL = 0.8 V) and 3-state outputs ensure robust level-shifting without external translators.