Texas Instruments ADS8482IRGZR

Overview

ADS8482IRGZR from Texas Instruments is an 18-bit, 1-MSPS pseudo-bipolar fully differential SAR analog-to-digital converter with integrated 4.096-V reference, ±1.2 LSB typical INL, 99 dB SNR, and zero-latency operation. It supports 18-/16-/8-bit parallel bus interfaces and operates over –40°C to +85°C in high-accuracy data acquisition systems for medical instrumentation and transducer interface applications.

For engineers reviewing the ADS8482IRGZR datasheet, ADS8482IRGZR pinout, ADS8482IRGZR application, or ADS8482IRGZR equivalent, this page delivers verified electrical specifications, validated package mapping, confirmed timing behavior at 1 MSPS, real-world interface configurations (including BYTE/BUS18/16 mode selection), and direct alternative part comparisons grounded in TI's official family documentation.

Technical Context

The ADS8482IRGZR implements a charge-redistribution SAR architecture with inherent sample-and-hold, enabling true zero-latency conversion. Its internal 4.096-V reference features ±6 ppm/°C drift and is buffered for low-noise operation, with REFIN requiring 0.1-µF decoupling to REFM and REFOUT supporting 1-µF storage capacitance when enabled.

It accepts fully differential pseudo-bipolar inputs (±V_REF span), supports three parallel data transfer modes (18-bit single-cycle, 16-bit two-cycle, or 8-bit three-cycle), and uses asynchronous control signals - CONVST (edge-triggered), BUSY (open-drain status), CS (acquisition start), and RD (data strobe) - all compatible with CMOS logic levels across 2.7–5.25 V digital supply.

Key Specifications

Pinout & Package

ADS8482IRGZR is housed in a thermally enhanced 48-pin 7×7 mm QFN package (RGZ) with exposed thermal pad requiring PCB soldering for mechanical stability and thermal performance. Pin functions are validated per TI SLAS386A datasheet Rev. June 2006.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8482IRGZR, ADS8481IRGZR trades 250 kSPS throughput for lower power and identical pin compatibility, while ADS8382IPWR sacrifices integration and package size for external reference control - both serve distinct trade-offs in precision DAQ system partitioning.

Availability

ADS8482IRGZR is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, and high-accuracy data acquisition systems requiring stable component supply, long-lifecycle support, and guaranteed 18-bit NMC performance across industrial temperature ranges.

Supply support for ADS8482IRGZR 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 high-performance signal chain solutions with decades of ADC innovation.

The ADS8482IRGZR belongs to TI's high-speed SAR ADC family designed for precision data acquisition in medical, industrial, and communications infrastructure - emphasizing zero-latency, integrated references, and flexible parallel interfacing without sacrificing DC accuracy.

FAQ

What is the maximum sampling rate supported by the ADS8482IRGZR?

The ADS8482IRGZR supports a maximum throughput rate of 1 MSPS, with a fixed conversion time of 650 ns and acquisition time of 320 ns. This enables reliable sampling of input signals up to 500 kHz while maintaining full 18-bit resolution and specified dynamic performance including 99 dB SNR and 123 dB SFDR. The ADS8482IRGZR achieves this without pipeline latency, delivering zero-latency output aligned to the CONVST falling edge.

Does the ADS8482IRGZR require an external reference voltage?

No, the ADS8482IRGZR includes a factory-trimmed 4.096-V internal reference with ±6 ppm/°C drift and 120-ms startup time. When using the internal reference, REFOUT (Pin 14) must be connected to REFIN (Pin 13) via a 0.1-µF capacitor, and a 1-µF storage capacitor must be placed between REFOUT and REFM (Pins 11/12). External reference operation is optional and supported over 3.0–4.2 V at REFIN.

How does the BYTE and BUS18/16 pin configuration affect data readout on the ADS8482IRGZR?

On the ADS8482IRGZR, BUS18/16 = 0 selects 18-bit parallel transfer (DB[17:0] active simultaneously); BUS18/16 = 1 enables 16-bit mode where DB[17:2] output D[17:2], and BYTE selects byte folding: BYTE = 0 routes D[9:2] to DB[9:2], BYTE = 1 routes D[9:2] to DB[17:10]. This allows seamless adaptation to 8-bit, 16-bit, or 18-bit microcontrollers without external glue logic.

What is the guaranteed integral nonlinearity (INL) specification for the ADS8482IRGZR over temperature?

The ADS8482IRGZR guarantees ±2.5 LSB maximum integral nonlinearity over the full industrial temperature range (–40°C to +85°C), with ±1.2 LSB typical performance. This endpoint INL specification applies to the ADS8482I variant (ordering code ADS8482IRGZR), ensuring <0.005% full-scale error without post-calibration - critical for metrology-grade applications where linearity directly impacts measurement traceability.

Can the ADS8482IRGZR operate with separate analog and digital supplies?

Yes, the ADS8482IRGZR uses independent power domains: +VA (5 V ±5%) powers the analog core and reference, while +VBD (2.7–5.25 V) powers the parallel digital interface. AGND and BDGND are separate pins requiring single-point connection near the device. This separation minimizes digital switching noise coupling into the analog path, preserving 99 dB SNR and –121 dB THD performance at 1 MSPS.