Texas Instruments ADS1282HIPWR

Overview

ADS1282HIPWR from Texas Instruments is an ultra-high-precision 32-bit delta-sigma ADC with integrated 64× PGA, fourth-order modulator, and programmable digital filter (Sinc + FIR + IIR). It delivers 130-dB SNR at 250 SPS, ±0.5 ppm INL, –122 dB THD, and supports bipolar (±2.5 V) or unipolar (+5 V) analog supplies. It is engineered for seismic monitoring systems requiring nanovolt-level resolution and low-drift performance in harsh geophysical environments.

For engineers reviewing the ADS1282HIPWR datasheet, ADS1282HIPWR pinout, ADS1282HIPWR application, or ADS1282HIPWR equivalent, key selection considerations include its 250–4000 SPS selectable data rate, on-chip offset/gain calibration engine, SYNC-driven multi-device synchronization, and TSSOP-28 package compatibility with high-impedance hydrophone/geophone sensor interfaces.

Technical Context

The ADS1282HIPWR employs a fourth-order, inherently stable, 2+2 pipelined delta-sigma modulator architecture that shifts quantization noise beyond the passband for clean digital filtering. Its continuous-time PGA provides 5 nV/√Hz input-referred noise and programmable gain (1–64) with differential CAPP/CAPN outputs requiring 10 nF bypassing.

The on-chip digital filter offers three configurable output stages: decimating sinc (up to 128 kSPS), selectable-phase FIR (250–4 kSPS), and adjustable high-pass IIR (0.1–10 Hz corner) for DC removal. Modulator over-range detection is reported via MFLAG, and full-system calibration is supported by dedicated offset/gain scaling registers.

Key Specifications

Pinout & Package

TSSOP-28 package with exposed thermal pad (PW suffix); 9.7 mm × 4.4 mm footprint, 1.2 mm height; specified for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1282HIPWR, the ADS1283IPWR trades extended temperature range and hydrophone-optimized input for cost reduction, while the AD7768-1BCPZ sacrifices PGA integration and nanovolt noise for higher channel density and throughput-neither is pin-compatible nor functionally interchangeable without redesign.

Availability

ADS1282HIPWR is available at Aetrix Electronics and suitable for energy exploration seismographs, offshore hydrophone arrays, and high-accuracy structural health monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS1282HIPWR 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 leadership in precision data converters and sensor signal chains.

The ADS1282 product line was designed specifically for geophysical instrumentation demanding extreme DC accuracy, ultra-low noise, and robust synchronization-targeting seismic, energy, and scientific measurement applications where signal integrity is non-negotiable.

FAQ

What is the maximum operating temperature specification for the ADS1282HIPWR?

The ADS1282HIPWR is fully specified from –40°C to +125°C, with absolute maximum junction temperature rated at +150°C. This extended temperature range makes it suitable for downhole logging tools and outdoor seismic acquisition units exposed to desert or arctic conditions. The ADS1282HIPWR maintains its 130-dB SNR and ±0.5 ppm INL performance across this full range, unlike standard-grade variants such as the ADS1283IPWR limited to +85°C.

Does the ADS1282HIPWR support true bipolar input operation?

Yes, the ADS1282HIPWR supports true bipolar analog inputs using separate AVDD (+2.5 V) and AVSS (–2.5 V) supplies, enabling ±2.5 V differential input range referenced to ground. With PGA = 1 and VREF = 5 V, the full-scale range is ±2.5 V; higher PGA settings proportionally reduce input range (e.g., ±0.039 V at PGA = 64). This configuration eliminates input offset errors inherent in unipolar systems and is essential for accurate zero-crossing detection in seismic waveform analysis.

How does the SYNC input function in multi-device synchronization for the ADS1282HIPWR?

The SYNC input on the ADS1282HIPWR resets both the modulator and digital filter simultaneously, ensuring deterministic alignment of conversion start times across multiple devices. When driven by a common clock edge, all ADS1282HIPWR units initiate sampling within one clock cycle, enabling coherent array processing in distributed seismic networks. Unlike software-triggered methods, SYNC provides hardware-level timing control independent of SPI bus latency or register access delays-critical for sub-microsecond inter-channel skew requirements.

What is the purpose of the MFLAG output on the ADS1282HIPWR?

The MFLAG output on the ADS1282HIPWR is a dedicated modulator over-range indicator that asserts logic-high when the internal delta-sigma modulator saturates due to input overdrive. Unlike DRDY, which signals data readiness, MFLAG provides real-time fault detection without requiring register reads or interrupt polling. This allows immediate corrective action-such as PGA attenuation or input attenuation-to prevent data corruption in transient-rich environments like earthquake monitoring or blast sensing.

Can the ADS1282HIPWR operate with a 1.8-V digital supply?

Yes, the ADS1282HIPWR supports DVDD from 1.8 V to 3.3 V, making it compatible with modern low-voltage microcontrollers and FPGAs. At 1.8 V, the digital I/O thresholds are VIH ≥ 1.44 V and VIL ≤ 0.36 V, with VOL ≤ 0.2 × DVDD under 1 mA load. Power consumption scales linearly: DVDD current drops from 0.8 mA at 3.3 V to ~0.6 mA at 1.8 V, contributing to the device's total 25 mW normal operation power budget. This flexibility simplifies mixed-supply system design without level-shifting.