ADS1284IRHFT

Overview

The ADS1284IRHFT is a high-resolution, dual-channel analog-to-digital converter (ADC) from Texas Instruments designed for seismic and geophysical exploration. It integrates a low-noise programmable gain amplifier (PGA), a fourth-order inherently stable delta-sigma modulator, and a flexible digital filter. The device supports data rates up to 4000 SPS with selectable power modes, achieving 127dB SNR in low-power mode and 130dB SNR in high-resolution mode at 250 SPS with PGA set to 1. It features a dual-channel multiplexer, synchronous input control, and on-chip gain/offset calibration registers. The component operates within an extended temperature range of -50°C to +125°C and is housed in a compact 24-lead VQFN package.

Feature Summary

• Dual-channel multiplexer with short-circuit and internal noise test capabilities
• Flexible digital filtering with sinc, FIR, and IIR options including HPF
• Integrated PGA with high input impedance suitable for direct sensor connection
• On-chip gain and offset calibration registers for system accuracy

Applications

• Seismic data acquisition systems
• Geophysical exploration equipment
• Earth space detection instruments

Procurement Notes

Verify the specific suffix IRHFT against the manufacturer's official documentation to confirm tape-and-reel packaging and temperature grade specifications. Ensure compatibility with SPI interface requirements and voltage levels for analog and digital supplies before integration into the design.

Selection Notes

Select this component when high resolution and low noise are critical for multi-channel signal acquisition. Consider the trade-off between power consumption and resolution based on the required sample rate. Verify that the PGA settings and digital filter configurations meet the specific bandwidth and noise requirements of the target application.

Part Context

The ADS1284 belongs to the ADS128x family of high-resolution ADCs from Texas Instruments. This family includes variants such as the ADS1281, ADS1282, and ADS1287, which differ primarily in channel count and package options. The ADS1284 specifically offers two channels, distinguishing it from single-channel or four-channel counterparts in the same series.

Replacement Considerations

Check for ADS1282 or ADS1287 if channel count differences are acceptable. Verify pinout and register compatibility with existing designs when substituting within the ADS128x family.