ADS1283AIRHFT

Overview

The ADS1283AIRHFT is a high-resolution, dual-channel analog-to-digital converter (ADC) from Texas Instruments. It features a fourth-order delta-sigma modulator and an integrated low-noise programmable gain amplifier (PGA). The device supports data rates from 250 to 4000 SPS with selectable digital filters. Key electrical parameters include a signal-to-noise ratio of 130 dB at 250 SPS, total harmonic distortion of -122 dB, and input noise density of 5 nV/√Hz. Power consumption is 18 mW in operating mode and 10 μW in shutdown. 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

• Integrated low-noise PGA with two-channel multiplexer
• Flexible digital filter with sinc, FIR, and IIR options
• On-chip offset and gain calibration engine
• Synchronization input for multi-device systems

Applications

• Energy exploration
• Seismic monitoring
• High-accuracy instrumentation

Procurement Notes

Verify the specific suffix 'TG4' against the manufacturer's current datasheet revision to confirm lead-free status and RoHS compliance details. Ensure the ordering part number matches the exact package variant required for your PCB layout. Cross-reference the component marking code with official documentation to prevent counterfeit risks during procurement.

Selection Notes

Select this model for applications requiring ultra-high resolution and low noise. Verify that the system power supplies match the specified 5 V analog and 1.8 V to 3.3 V digital ranges. Confirm that the required data rate falls within the 250 to 4000 SPS range supported by the internal digital filters. Check if the integrated PGA gain settings meet the input signal requirements.

Part Context

This component belongs to the ADS1283 family of high-resolution ADCs. It shares architectural similarities with the ADS1281 and ADS1282 but offers distinct channel counts and performance characteristics. The AIRHFT designation indicates a specific temperature grade and tape-and-reel packaging configuration suitable for automated surface-mount assembly processes.

Replacement Considerations

ADS1283BIRHFTG4

FAQ

What is the maximum clock frequency for the ADS1283?

The master clock input (CLK) supports a maximum frequency of 4.096 MHz.

How does the CHOP feature affect noise performance?

Enabling the CHOP bit reduces the 1/f noise of the PGA, significantly improving low-frequency noise performance, particularly at higher gains and lower sample rates.

Can multiple ADS1283 devices be synchronized?

Yes, the SYNC input allows for synchronization of conversions across multiple ADS1283 devices when driven by a rising edge.