Texas Instruments ADS8471IRGZT

Overview

ADS8471IRGZT 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 operation. It delivers ±0.7 LSB max INL, 93 dB SNR, and 220 mW power consumption at full speed, targeting high-accuracy data acquisition in medical instruments and optical networking systems.

For engineers reviewing the ADS8471IRGZT datasheet, ADS8471IRGZT pinout, ADS8471IRGZT application, or ADS8471IRGZT equivalent, key selection criteria include its 48-pin QFN package, dual-voltage digital supply (2.7–5.25 V), ±0.1 mV offset error, and support for both internal reference operation and external reference input (3.0–4.2 V).

Technical Context

The ADS8471IRGZT employs a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, enabling true zero-latency conversion. Its internal clock generates a fixed 700 ns conversion time, sustaining 1-MHz throughput without external timing components.

It supports two parallel data transfer modes: full 16-bit bus (DB[15:0]) or 8-bit folded bus via BYTE control, with BUSY signal indicating conversion status and RD/CS controlling read timing. The device operates with separate analog (+VA) and digital (+VBD) supplies, and features dedicated AGND and BDGND pins to minimize noise coupling between signal and interface domains.

Key Specifications

Pinout & Package

ADS8471IRGZT 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 ADS8472IRGZT and ADS8402IBRFDT, the ADS8471IRGZT uniquely balances integrated reference convenience, pseudo-bipolar input flexibility, and industrial temperature-rated performance in a compact QFN package - making it optimal for space-constrained, cost-sensitive, and fast-turnaround data acquisition designs.

Availability

ADS8471IRGZT is available at Aetrix Electronics and suitable for medical instruments, optical networking equipment, and high-accuracy data acquisition systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for ADS8471IRGZT 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 ADS8471IRGZT belongs to TI's high-speed SAR ADC product line, engineered for applications demanding 16-bit accuracy, sub-microsecond latency, and robust operation in industrial and medical environments - not merely general-purpose digitization.

FAQ

What is the maximum sampling rate supported by the ADS8471IRGZT?

The ADS8471IRGZT supports a maximum sampling rate of 1 MSPS, corresponding to a minimum conversion time of 700 ns. This rate is achievable across the full industrial temperature range (–40°C to +85°C) with all specifications guaranteed, including INL, DNL, and dynamic performance metrics like SNR and THD. The internal clock architecture ensures consistent timing without external dependencies.

Does the ADS8471IRGZT require an external reference voltage?

No, the ADS8471IRGZT includes an integrated 4.096-V internal reference with ±6 ppm/°C drift and 120 ms startup time. When using the internal reference, REFOUT must be connected to REFIN via a 1-µF capacitor to REFM. An external reference (3.0–4.2 V) may be used instead by driving REFIN directly, but the internal option eliminates external components and simplifies layout for the ADS8471IRGZT.

How does the BYTE pin affect data readout on the ADS8471IRGZT?

The BYTE pin on the ADS8471IRGZT configures the parallel data bus mode: when BYTE = 0, all 16 bits (DB[15:0]) are driven simultaneously; when BYTE = 1, only DB[15:8] carries valid data while DB[7:0] outputs all ones, effectively folding the 16-bit result into an 8-bit bus for legacy 8-bit processor interfaces. This feature enables hardware-compatible migration without redesigning the ADS8471IRGZT's host interface.

What are the power supply requirements for the ADS8471IRGZT?

The ADS8471IRGZT requires two independent supplies: +VA (4.75–5.25 V, 44–48 mA typical) for the analog core and +VBD (2.7–5.25 V, ~1 mA) for the digital I/O interface. Separate AGND and BDGND connections are mandatory to prevent digital switching noise from degrading analog performance. Decoupling capacitors (0.1 µF ceramic per supply pin) must be placed close to the ADS8471IRGZT package.

Can the ADS8471IRGZT operate in pseudo-bipolar and unipolar input modes simultaneously?

No - the ADS8471IRGZT supports either pseudo-bipolar (±Vref differential input) or unipolar (0 to Vref) operation, selected by external biasing of the +IN and –IN pins. Pseudo-bipolar mode uses both inputs actively; unipolar mode ties –IN to analog ground (AGND) and applies signal to +IN. The ADS8471IRGZT does not auto-detect or switch modes - configuration is fixed per circuit design and remains static during operation.