ADS1284IRHFR

Overview

The ADS1284IRHFR is a high-resolution, single-chip analog-to-digital converter (ADC) from Texas Instruments. It integrates a low-noise programmable gain amplifier (PGA), a fourth-order intrinsic stable delta-sigma modulator, and a digital filter. The device supports two selectable operating modes: a low-power mode consuming 12 mW with 127 dB SNR at 250 SPS, and a high-resolution mode consuming 18 mW with 130 dB SNR at 250 SPS. Key electrical parameters include a 31-bit resolution, 4 kSPS maximum sampling rate, 130 dB SNR, -122 dB total harmonic distortion, and 123 dB spurious-free dynamic range. It operates on a 5 V analog supply and 1.8 V to 3.3 V digital supply, housed in a 24-pin VQFN package.

Feature Summary

• Dual-mode operation balancing power consumption and signal resolution for optimized energy efficiency.
• Integrated dual-channel multiplexer enabling input shorting for internal noise testing and self-diagnosis.
• Flexible digital filtering architecture combining sinc, FIR, and optional IIR stages with linear or minimum phase options.
• High-impedance PGA designed for direct connection to low-level sensors such as geophones and hydrophones.

Applications

• Seismic data acquisition systems for oil and gas exploration.
• Earth space detection and geological monitoring instruments.
• High-precision laboratory measurement equipment requiring ultra-low noise performance.

Procurement Notes

Verify the specific suffix IRHFR against the manufacturer's current datasheet to confirm package type, temperature rating, and tape-and-reel specifications. Ensure compatibility with system voltage levels and SPI interface timing requirements before finalizing procurement orders.

Selection Notes

Select this component when applications demand high channel count relative to resolution or require integrated multiplexing capabilities. Compare against the ADS1283 if only two channels are needed, or the ADS1287 for lower power consumption at reduced resolution. Evaluate the trade-off between the 12 mW low-power mode and 18 mW high-resolution mode based on thermal constraints.

Part Context

The ADS1284 belongs to the ADS128x family of high-resolution ADCs from Texas Instruments, designed specifically for demanding sensor interfaces. It shares architectural similarities with the ADS1281, ADS1282, and ADS1283 but offers distinct channel configurations and feature sets tailored for multi-channel seismic and geophysical data acquisition environments.

Replacement Considerations

The ADS1283BIRHFR is a verified substitute within the same product family, offering similar high-resolution performance with a two-channel configuration. Verify pinout compatibility and software register mapping differences when transitioning between these variants.