ADS1283AIRHFR

Overview

The ADS1283AIRHFR is a high-resolution, two-channel analog-to-digital converter (ADC) utilizing a fourth-order delta-sigma modulator. It integrates a low-noise programmable gain amplifier (PGA) with gains from 1 to 64 and a two-channel input multiplexer. The device supports data rates from 250 SPS to 4 kSPS via selectable digital filters. Key electrical specifications include a signal-to-noise ratio of 130 dB at 250 SPS with PGA=1, total harmonic distortion of -122 dB, and an offset voltage of 100 mV. Power consumption is 18 mW in operating mode. It operates on a 5 V or ±2.5 V analog supply and a 1.8 V to 3.3 V digital supply.

Feature Summary

• Integrates a fourth-order inherently stable delta-sigma modulator with a fast-responding overrange detector for superior noise and linearity performance.
• Features a flexible digital filter architecture supporting Sinc, FIR, and IIR configurations with selectable linear or minimum phase responses and programmable high-pass filtering.
• Includes an on-chip calibration engine for offset and gain scaling, alongside a SYNC input for synchronizing conversions across multiple devices.
• Provides a low-noise PGA with 5 nV/√Hz noise density and high input impedance, facilitating direct interfacing with sensors such as geophones and hydrophones.

Applications

• Energy exploration systems
• Seismic monitoring equipment
• High-accuracy instrumentation

Procurement Notes

Verify the specific suffix 'AIRHFR' against the manufacturer's current package option addendum to confirm the VQFN-24 package and industrial temperature range (-40°C to +85°C). Ensure that the ordering information matches the latest datasheet revision to avoid discrepancies in pinout or electrical characteristics due to potential design updates.

Selection Notes

Select this component when dual-channel high-resolution conversion is required for seismic or exploration applications. Compare the ADS1283A variant if fixed gain options are sufficient, or the ADS1283B variant if a lower offset specification is necessary. Confirm that the required PGA gain settings align with the available options for the specific sub-part number selected.

Part Context

This part belongs to the ADS1283 family of high-resolution ADCs from Texas Instruments. The family includes variants like the ADS1283A and ADS1283B, which differ primarily in offset specifications and available PGA gain steps. The standard ADS1283 offers full gain flexibility from 1 to 64, while the AIRHFR suffix denotes the specific tape-and-reel packaging and industrial temperature grade.

Replacement Considerations

ADS1283AIRHFT: Same functional specifications with tray packaging instead of reel.

FAQ

What is the maximum data rate supported by the FIR filter mode?

The FIR filter mode supports selectable data rates up to 4000 samples per second (SPS).

How does the CHOP feature affect the ADS1283's noise performance?

Enabling the CHOP bit reduces the PGA's 1/f noise. Disabling it results in increased low-frequency noise, particularly noticeable at high PGA gains and lower sample rates.

What is the purpose of the SYNC input pin?

The SYNC input allows for the synchronization of conversions between multiple ADS1283 devices, ensuring coherent sampling across a multi-channel system.