Texas Instruments ADS8482IBRGZT

Overview

ADS8482IBRGZT from Texas Instruments is an 18-bit, 1-MSPS pseudo-bipolar fully differential SAR analog-to-digital converter with integrated 4.096-V reference, ±2.5 LSB max INL, 99 dB SNR, and parallel 18/16/8-bit bus interface. It operates over –40°C to +85°C in medical instrumentation and high-accuracy data acquisition systems.

For engineers reviewing the ADS8482IBRGZT datasheet, ADS8482IBRGZT pinout, ADS8482IBRGZT application, or ADS8482IBRGZT equivalent, key selection criteria include its zero-latency conversion, unipolar differential input range (±Vref), internal reference drift (±6 ppm/°C), and QFN-48 package compatibility with high-density PCB layouts.

Technical Context

The ADS8482IBRGZT implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling true zero-latency operation and 650 ns conversion time. Its pseudo-bipolar input accepts differential signals from –Vref to +Vref while maintaining full 18-bit resolution across temperature.

It supports three parallel data transfer modes: 18-bit (single-cycle), 16-bit (two-cycle), and 8-bit (three-cycle), controlled by BUS18/16 and BYTE inputs. The internal 4.096-V reference features double buffering and 120 ms start-up time with 1-µF storage capacitance.

Key Specifications

Pinout & Package

ADS8482IBRGZT is housed in a thermally enhanced 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad requiring soldering to PCB ground plane for thermal and mechanical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8482IBRGZT, ADS8481IRGZT trades internal reference and tighter INL for lower cost and same package, while ADS8382IPFBT offers superior performance in a larger, non-pin-compatible package-making ADS8482IBRGZT optimal for space-constrained, self-contained 4.096-V-referenced designs.

Availability

ADS8482IBRGZT is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, transducer interface, and high-accuracy data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.

Supply support for ADS8482IBRGZT 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 ICs.

The ADS8482IBRGZT belongs to TI's high-speed SAR ADC family designed for applications demanding simultaneous high resolution, fast throughput, and integrated reference stability-targeting medical, test & measurement, and industrial sensing markets.

FAQ

What is the maximum sample rate supported by the ADS8482IBRGZT?

The ADS8482IBRGZT supports a maximum throughput rate of 1 MSPS, achieved with a 650 ns conversion time and zero-latency architecture. This enables accurate sampling of input signals up to 500 kHz according to the Nyquist–Shannon theorem. The device maintains full 18-bit resolution and specified dynamic performance (e.g., 99 dB SNR) at this rate under industrial temperature conditions (–40°C to +85°C) with proper power supply decoupling and reference conditioning.

Does the ADS8482IBRGZT require an external reference voltage?

No, the ADS8482IBRGZT includes a factory-trimmed 4.096-V internal reference with ±6 ppm/°C drift and 120 ms start-up time when using the REFOUT-to-REFIN connection with 1-µF storage capacitance. External reference operation is optional via the REFIN pin (3.0–4.2 V range), but the internal reference eliminates external components and simplifies layout-making it ideal for space-constrained, self-contained designs where 4.096 V is suitable for the full-scale range.

How does the BUS18/16 and BYTE pin configuration affect data readout on the ADS8482IBRGZT?

The BUS18/16 and BYTE pins configure the ADS8482IBRGZT's parallel interface timing and data alignment: BUS18/16 = 0 selects 18-bit mode (all DB[17:0] valid in one cycle); BUS18/16 = 1 with BYTE = 0 reads MSBs DB[17:2] on DB[17:10] and LSBs DB[1:0] on DB[9:2]; BYTE = 1 folds DB[9:2] to DB[17:10]. This enables seamless interfacing with 8-bit, 16-bit, or 32-bit microcontrollers without external glue logic.

What is the meaning of "pseudo-bipolar" input in the ADS8482IBRGZT datasheet?

"Pseudo-bipolar" in the ADS8482IBRGZT denotes a fully differential input architecture that accepts voltage differences from –Vref to +Vref (i.e., –4.096 V to +4.096 V), while both +IN and –IN pins operate within a unipolar common-mode range of (Vref/2) ±0.2 V. This differs from true bipolar inputs that allow individual pins to swing negative relative to ground-it simplifies power supply design (single +VA rail) while preserving differential noise rejection and wide dynamic range for sensor interfaces like Wheatstone bridges.

Can the ADS8482IBRGZT be used in systems requiring guaranteed no missing codes?

Yes, the ADS8482IBRGZT guarantees no missing codes (NMC) across its full 18-bit output range under all specified operating conditions, including –40°C to +85°C temperature range and 1 MSPS sampling. This is explicitly confirmed in the datasheet's "SYSTEM PERFORMANCE" table and ensures monotonic behavior essential for closed-loop control, position feedback, and metrology applications where code transitions must never skip-even at temperature extremes or supply variations.