Texas Instruments ADS1283BIRHFT

Overview

ADS1283BIRHFT from Texas Instruments is an ultra-high-resolution, low-noise delta-sigma ADC with integrated PGA and dual-channel multiplexer, delivering 130 dB SNR at 250 SPS (PGA = 1), –122 dB THD, and 31-bit resolution for seismic-grade precision. It operates with ±2.5 V or 5 V analog supplies, 1.65–3.6 V digital supply, and supports programmable high-pass filtering and on-chip offset/gain calibration.

For engineers reviewing the ADS1283BIRHFT datasheet, ADS1283BIRHFT pinout, ADS1283BIRHFT application, or ADS1283BIRHFT equivalent, this page provides verified functional context, validated pin roles, confirmed seismic and instrumentation use cases, and two rigorously cross-referenced alternative parts with documented technical and application-level differences.

Technical Context

The ADS1283BIRHFT employs a fourth-order inherently stable ΔΣ modulator with fast overrange detection and a fully configurable digital filter chain-Sinc + FIR + IIR-with selectable linear or minimum-phase response and adjustable high-pass corner (0.1–10 Hz). Its dual-input mux enables simultaneous external measurement and internal self-test routing.

It integrates a low-noise (5 nV/√Hz) PGA with gain range 1–64, CHOP-enabled offset drift of 0.03 μV/°C, and supports synchronized multi-device operation via SYNC input. The device uses a 4.096 MHz master clock and delivers data rates from 250 to 4 kSPS in FIR mode or up to 128 kSPS in Sinc mode.

Key Specifications

Pinout & Package

The ADS1283BIRHFT 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 (August 2019).

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 ADS131M08IPBSR, the ADS1283BIRHFT uniquely combines dual-channel synchronous acquisition, 130 dB SNR, on-chip PGA with CHOP, and 75/100 mV offset flexibility-making it irreplaceable for field-deployed seismic arrays requiring uncompromised low-frequency fidelity and long-term stability.

Availability

ADS1283BIRHFT is available at Aetrix Electronics and suitable for seismic data acquisition, geophysical exploration, and high-accuracy instrumentation requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.

Supply support for ADS1283BIRHFT 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 signal chains.

The ADS1283BIRHFT belongs to TI's high-end delta-sigma ADC product line, engineered specifically for ultra-low-noise, high-stability applications in energy exploration and scientific instrumentation where measurement integrity is non-negotiable.

FAQ

What is the maximum achievable SNR for ADS1283BIRHFT and under what conditions?

The ADS1283BIRHFT achieves a maximum SNR of 130 dB at 250 SPS with PGA = 1, CHOP enabled, and 4.096 MHz clock. This value is measured with shorted inputs, 25°C, ±2.5 V supplies, and VREF = 5 V. At higher data rates (e.g., 4 kSPS), SNR decreases to 117 dB due to increased noise bandwidth. The ADS1283BIRHFT datasheet Table 1 confirms this performance is specific to the ADS1283B variant under these exact conditions.

Does ADS1283BIRHFT support true differential reference inputs, and what is the valid voltage range?

Yes, ADS1283BIRHFT accepts true differential reference inputs via VREFP and VREFN pins. The valid differential reference voltage (VREF = VREFP – VREFN) ranges from 1 V to 5 V, with absolute limits of VREFN ≥ AVSS – 0.1 V and VREFP ≤ AVDD + 0.1 V. This allows flexible reference sourcing-including external precision references or internal buffered options-while maintaining full 31-bit resolution scaling in the ADS1283BIRHFT.

How does the 75 mV offset option in ADS1283BIRHFT differ from the 100 mV option in ADS1283, and when should each be used?

The ADS1283BIRHFT supports both 75 mV and 100 mV offset options (controlled by the OFFSET bit), whereas standard ADS1283 only offers 100 mV. The 75 mV option extends usable full-scale range for low-amplitude sensors (e.g., high-impedance geophones), improving effective resolution at small signal levels. Use 75 mV when optimizing for microvolt-level inputs; use 100 mV for broader dynamic range in mixed-signal environments. Both are validated in ADS1283BIRHFT electrical specs.

Can ADS1283BIRHFT operate with a single 5 V analog supply instead of split ±2.5 V rails?

Yes, ADS1283BIRHFT supports single-supply operation: AVDD = 5 V and AVSS = 0 V is explicitly permitted per Recommended Operating Conditions (Section 6.3). In this configuration, the input common-mode range shifts to 0.7 V–3.75 V, and VREF must be configured accordingly (e.g., VREFP = 2.5 V, VREFN = 0 V). All key specs-including 130 dB SNR and –122 dB THD-are guaranteed under this condition for ADS1283BIRHFT.

What is the purpose of the MFLAG pin on ADS1283BIRHFT, and how is it used in system design?

The MFLAG pin on ADS1283BIRHFT is a dedicated modulator overrange indicator: logic high signifies the internal ΔΣ modulator has saturated, independent of digital filter clipping. This enables early-warning detection of sensor overload or wiring faults before corrupted data reaches the host processor. In seismic arrays, MFLAG is monitored alongside DRDY to trigger automatic gain adjustment or alert logging-ensuring data validity is maintained across the ADS1283BIRHFT's full operating envelope.