Texas Instruments ADS1283IRHFR

Overview

ADS1283IRHFR from Texas Instruments is an ultra-high-resolution, delta-sigma analog-to-digital converter with integrated low-noise PGA (5 nV/√Hz), two-channel input multiplexer, and fourth-order inherently stable modulator. It delivers 130 dB SNR at 250 SPS (PGA = 1), –122 dB THD, and supports programmable FIR/IIR digital filtering for seismic monitoring and high-accuracy instrumentation systems.

For engineers reviewing the ADS1283IRHFR datasheet, ADS1283IRHFR pinout, ADS1283IRHFR application, or ADS1283IRHFR equivalent, key selection criteria include its 31-bit resolution, ±100 mV offset option, 250–4000 SPS selectable data rates, linear/minimum-phase filter response, and operation across –40°C to +85°C in a 5-mm × 4-mm VQFN package.

Technical Context

The ADS1283IRHFR employs a fourth-order delta-sigma modulator with fast overrange detection and on-chip digital filtering combining sinc, FIR, and IIR stages. Its flexible input mux enables dual external sensor inputs or internal self-test paths, while the PGA provides gain from 1 to 64 with 5 nV/√Hz input noise and >1 GΩ differential input impedance when chop mode is enabled.

Digital interface uses SPI-compatible serial protocol with CS, SCLK, DIN, DOUT, DRDY, and SYNC signals; clock input is fixed at 4.096 MHz. The device supports offset and gain calibration engines, adjustable high-pass filter corner (0.1–10 Hz), and synchronization of multiple units via the SYNC input.

Key Specifications

Pinout & Package

The ADS1283IRHFR is housed in a 24-pin VQFN package (5.00 mm × 4.00 mm) with exposed thermal pad (non-electrical, soldered to PCB). Pin functions are validated per TI SBAS565C Rev C datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.

Compared with ADS1282IRHFT and AD7768-1ACPZ, the ADS1283IRHFR uniquely combines 31-bit resolution, integrated 5-nV/√Hz PGA, dual-input mux, and seismic-optimized digital filtering - making it the only single-chip solution that eliminates external amplifiers while maintaining sub-μV offset stability in field-deployed instrumentation.

Availability

ADS1283IRHFR is available at Aetrix Electronics and suitable for seismic monitoring, energy exploration, and high-accuracy instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.

Supply support for ADS1283IRHFR 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 signal chain solutions.

The ADS1283IRHFR belongs to TI's high-resolution delta-sigma ADC product line, engineered specifically for geophysical sensing and ultra-low-noise instrumentation where signal integrity, long-term stability, and system-level calibration efficiency are critical.

FAQ

What is the maximum achievable SNR of the ADS1283IRHFR and under what conditions?

The ADS1283IRHFR achieves a maximum SNR of 130 dB at 250 SPS with PGA = 1, CHOP enabled, and 4.096-MHz master clock. This value is measured with shorted inputs and represents the device's best noise performance in low-bandwidth, high-resolution mode. At higher data rates (e.g., 4000 SPS), SNR decreases to 117 dB due to increased noise bandwidth. The ADS1283IRHFR maintains this performance across its full specified temperature range (–40°C to +85°C) when operated within recommended supply and reference conditions.

Does the ADS1283IRHFR support true differential input operation on both channels?

Yes, the ADS1283IRHFR supports fully differential input operation on both AINP1/AINN1 and AINP2/AINN2 channels. Each pair presents >1 GΩ differential input impedance (with CHOP enabled) and accepts a differential input voltage range of ±VREF/(2×PGA). The internal multiplexer routes either channel to the PGA and modulator, preserving common-mode rejection and enabling accurate ratiometric measurements when using the same reference source for both channels and the ADC.

How does the SYNC input function in multi-device configurations?

The SYNC input on the ADS1283IRHFR is a rising-edge-triggered signal that synchronizes the start of conversion across multiple devices. When asserted simultaneously to several ADS1283IRHFR units, it forces all modulators to begin their next conversion cycle at the same clock edge, ensuring coherent sampling for phased-array or distributed sensor systems. This capability is essential for time-of-flight analysis in seismic arrays and eliminates inter-device timing skew without requiring external clock distribution circuitry.

What is the role of the MFLAG pin on the ADS1283IRHFR?

The MFLAG pin on the ADS1283IRHFR is a digital output that indicates modulator overrange condition: logic low signifies normal operation, while logic high signals that the modulator input has exceeded its allowable range - typically due to excessive differential input voltage or reference violation. Unlike DRDY, which signals data readiness, MFLAG provides real-time protection feedback to the host controller, enabling immediate gain adjustment or input range correction before data corruption occurs.

Can the ADS1283IRHFR operate with a single 5-V analog supply instead of split ±2.5-V rails?

Yes, the ADS1283IRHFR supports single 5-V analog supply operation (AVDD = 5 V, AVSS = 0 V) per its recommended operating conditions. In this configuration, the input common-mode range shifts to 0.7 V to 3.75 V, and the reference inputs (VREFP/VREFN) must be configured accordingly - e.g., VREFP = 2.5 V and VREFN = 0 V for a 2.5-V reference. All AC and DC specifications, including SNR, THD, and offset, remain fully guaranteed across the –40°C to +85°C range under single-supply operation.