Texas Instruments ADS8472IRGZR

Overview

ADS8472IRGZR from Texas Instruments is a 16-bit, 1-MSPS pseudo-bipolar fully differential SAR analog-to-digital converter with integrated 4.096-V reference, parallel 8-/16-bit interface, and zero-latency operation. It delivers ±0.4 LSB typical INL, 95 dB SNR, and 123 dB SFDR at 2 kHz, targeting high-accuracy data acquisition in medical instruments and transducer interfaces.

For engineers reviewing the ADS8472IRGZR datasheet, ADS8472IRGZR pinout, ADS8472IRGZR application, or ADS8472IRGZR equivalent, this page provides verified technical context, validated package mapping to the 48-pin 7×7 QFN (RGZ), confirmed timing behavior including 650 ns conversion time and BUSY-driven read synchronization, and real-world interface examples with TMS320C6713 DSP.

Technical Context

The ADS8472IRGZR implements a charge-redistribution SAR architecture with inherent sample-and-hold, supporting true differential input ranges of ±V_REF (±4.096 V) and unipolar differential spans from V_REF to –V_REF. Its internal 4.096-V reference exhibits ±6 ppm/°C drift and is buffered for low-noise CDAC operation.

It supports two digital interface modes: full 16-bit parallel bus (DB[15:0]) or 8-bit byte-folded mode controlled by the BYTE pin. Conversion is initiated by CONVST falling edge, with BUSY signaling active conversion state; RD and CS coordinate data capture with precise timing windows (e.g., ten = 20 ns, tdis = 20–30 ns).

Key Specifications

Pinout & Package

The ADS8472IRGZR is housed in a thermally enhanced 48-pin QFN package (7 mm × 7 mm, RGZ), requiring soldering of the exposed thermal pad to PCB ground for thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8472IRGZR, ADS8471IRGZR offers identical footprint and interface at reduced speed and dynamic range, while ADS8402IBRGZR delivers higher throughput at the cost of external reference dependency and increased power - making ADS8472IRGZR optimal for 1-MSPS applications demanding self-contained precision.

Availability

ADS8472IRGZR is available at Aetrix Electronics and suitable for medical instrumentation, optical networking monitoring, and high-accuracy data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8472IRGZR 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 ADS8472IRGZR belongs to TI's high-speed SAR ADC family designed for applications demanding zero-latency, high linearity, and integrated reference stability - particularly in medical, test & measurement, and sensor signal conditioning systems.

FAQ

What is the maximum sample rate supported by the ADS8472IRGZR?

The ADS8472IRGZR supports a maximum throughput rate of 1 million samples per second (1 MSPS), achieved with a 650 ns conversion time and compatible timing margins for parallel bus read cycles. This rate is guaranteed across the full industrial temperature range (–40°C to +85°C) and applies to both 8-bit and 16-bit interface modes. The device maintains specified INL, SNR, and SFDR performance at this maximum rate when operated within recommended supply and reference conditions.

Does the ADS8472IRGZR require an external reference, or does it include one?

The ADS8472IRGZR includes an onboard 4.096-V reference with ±6 ppm/°C drift and 120 ms startup time, eliminating the need for an external reference in most applications. When using the internal reference, REFOUT (Pin 14) must be connected to REFIN (Pin 13) with a 0.1-µF capacitor, and a 1-µF storage capacitor must be placed between REFOUT and REFM (Pins 11–12). An external reference (3.0–4.2 V) may be applied to REFIN if tighter initial accuracy or different voltage is required.

How does the BYTE pin affect data output on the ADS8472IRGZR?

The BYTE pin (Pin 3) configures the ADS8472IRGZR's parallel interface between 16-bit and 8-bit modes. When BYTE = 0, DB[15:0] outputs the full 16-bit result. When BYTE = 1, the upper byte (DB[15:8]) carries bits D[9:2] of the 16-bit word (folded), while DB[7:0] carries D[15:8], enabling 8-bit microcontrollers to read the full result in two cycles. This mode preserves bit significance without requiring external latches or address decoding logic.

What are the power supply requirements for the ADS8472IRGZR?

The ADS8472IRGZR requires two independent supplies: +VA (analog, 4.75–5.25 V) for the SAR core and analog front-end, and +VBD (digital bus, 2.7–5.25 V) for the parallel interface drivers. Typical supply currents are 45–50 mA on +VA and ~1 mA on +VBD at 1 MSPS. AGND and BDGND must be kept separate and joined only at a single-point system ground to prevent digital noise coupling into analog measurements.

Can the ADS8472IRGZR interface directly with a TMS320C6713 DSP?

Yes, the ADS8472IRGZR is explicitly designed for direct parallel interfacing with the TMS320C6713 DSP, as documented in TI's Application Note SLAS514. CE2 memory space maps to CS, EXT_INT6 accepts BUSY for interrupt-driven reads, and TOUT1 generates CONVST. The BYTE pin is tied low to disable foldback, and the 16-bit ED[15:0] bus connects directly to DB[15:0]. No level shifters are needed when +VBD = 3.3 V and the DSP I/O is 3.3 V compliant.