Texas Instruments ADS8471IBRGZR

Overview

ADS8471IBRGZR from Texas Instruments is a 16-bit, 1-MSPS pseudo-bipolar/unipolar SAR analog-to-digital converter with integrated 4.096-V reference, parallel 16-/8-bit interface, and zero-latency conversion. It delivers ±0.7 LSB typical INL, 93 dB SNR, and ±0.1 mV offset error, enabling high-accuracy data acquisition in medical instruments and magnetometers.

For engineers reviewing the ADS8471IBRGZR datasheet, ADS8471IBRGZR pinout, ADS8471IBRGZR application, or ADS8471IBRGZR equivalent, key selection considerations include its 48-pin QFN package, dual-supply operation (+VA = 5 V, +VBD = 3–5 V), unipolar input range (0 V to Vref), and guaranteed 16-bit no-missing-codes performance over –40°C to +85°C.

Technical Context

The ADS8471IBRGZR employs a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, supporting true zero-latency operation and 700 ns conversion time. Its internal 4.096-V reference is buffered and stable to ±6 ppm/°C, with start-up time of 120 ms using a 1-µF storage capacitor.

It supports two digital bus modes: full 16-bit parallel output (DB[15:0]) or 8-bit folded-back mode via BYTE control, with CMOS-compatible I/O levels and 3-state drivers. Timing is synchronized by CONVST falling edge, with BUSY indicating active conversion and RD/CS controlling data read cycles.

Key Specifications

Pinout & Package

ADS8471IBRGZR is housed in a thermally enhanced 48-pin 7×7 mm QFN package (RGZ) with exposed thermal pad requiring PCB soldering for mechanical integrity and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8471IBRGZR, ADS8472IRGZR offers superior common-mode rejection but demands more complex analog conditioning, while ADS8381IPWR trades speed and interface simplicity for higher resolution and lower power-making each suitable for distinct signal chain architectures.

Availability

ADS8471IBRGZR is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, transducer interface, and magnetometer systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8471IBRGZR 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 ADS8471IBRGZR belongs to TI's high-speed SAR ADC product line, engineered for applications demanding 16-bit accuracy, 1-MSPS throughput, and integrated reference stability in space- and power-constrained industrial and medical systems.

FAQ

What is the operating temperature range for the ADS8471IBRGZR?

The ADS8471IBRGZR is characterized over the industrial temperature range of –40°C to +85°C. All specifications-including INL (±1 LSB max), DNL (±0.75 LSB max), and gain error drift (±0.7 ppm/°C)-are guaranteed across this range, making it suitable for deployment in harsh environmental conditions without derating.

Does the ADS8471IBRGZR require an external reference voltage?

No-the ADS8471IBRGZR includes a factory-trimmed 4.096-V internal reference with ±0.015 %FSR gain error and ±6 ppm/°C drift. When using the internal reference, connect REFOUT (Pin 14) to REFIN (Pin 13) with a 1-µF capacitor to REFM (Pins 11/12), which must be tied to AGND.

How does the BYTE pin affect data output on the ADS8471IBRGZR?

The BYTE pin (Pin 3) configures the ADS8471IBRGZR for either 16-bit or 8-bit parallel bus operation. When BYTE = 0, DB[15:0] outputs full 16-bit data. When BYTE = 1, DB[15:8] outputs D[9:2] of the MSB byte, and DB[7:0] outputs D[15:8], enabling 8-bit microcontroller interfacing without external latch logic.

What is the minimum pulse width required for the CONVST signal on the ADS8471IBRGZR?

The ADS8471IBRGZR requires a minimum CONVST low pulse width (tw1) of 40 ns and a minimum high pulse width (tw2) of 20 ns. These tight timing requirements support high-throughput operation and must be met using controlled-impedance PCB routing and proper driver slew-rate management to avoid metastability.

Can the ADS8471IBRGZR operate with separate analog and digital supplies?

Yes-the ADS8471IBRGZR features independent analog (+VA) and digital bus (+VBD) supplies. +VA operates from 4.75 V to 5.25 V for the SAR core and reference, while +VBD supports 2.7 V to 5.25 V for the parallel interface. This separation minimizes digital switching noise coupling into the analog signal path, preserving SNR and THD performance.