ADS8284IRGCT

Analog To Digital Converters (ADC) Overview

The ADS8284IRGCT is an 18-bit, 1-MSPS pseudo-bipolar differential successive approximation register (SAR) analog-to-digital converter (ADC) from Texas Instruments. It integrates a 4-channel differential multiplexer, an on-chip ADC driver operational amplifier, and a 4-V internal reference. The device supports a pseudo-bipolar input range of -4 V to +4 V with a 2-V common-mode voltage. It features an 18-/16-/8-bit parallel interface and operates with analog supplies of +5 V and -5 V, and digital supplies of 3.3 V or 5 V. Typical performance includes a signal-to-noise ratio of 98.4 dB and total harmonic distortion of -119 dB at a 2-kHz input frequency.

Analog To Digital Converters (ADC) Feature Summary

• 18-Bit Resolution with 1-MSPS sampling rate and zero latency
• Integrated 4-channel differential multiplexer with auto/manual scan modes
• On-chip ADC driver (OPA) and 4-V internal reference
• Supports pseudo-bipolar differential input range: -4 V to +4 V

Analog To Digital Converters (ADC) Applications

• Medical Imaging/CT Scanners
• Automated Test Equipment
• High-Speed Data Acquisition Systems
• High-Speed Closed-Loop Systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the component designation against official Texas Instruments documentation, as the ADS8284 is marked 'Not Recommended for New Designs'. Confirm that the specific IRGCT suffix corresponds to the QFN-64 package variant suitable for surface-mount assembly. Ensure compatibility with existing system designs given the device's status in the product lifecycle.

Analog To Digital Converters (ADC) Selection Notes

Select this component when an integrated solution combining high-resolution ADC, multiplexing, and signal conditioning is required. The ADS8284 eliminates external op-amps and reference components, simplifying board layout. Consider the dual supply requirement (+5 V/-5 V for analog, 3.3 V/5 V for digital) during power budgeting. Verify that the 1-MSPS throughput meets the system bandwidth requirements.

Analog To Digital Converters (ADC) Part Context

The ADS8284 belongs to the ADS8xxx family of SAR ADCs from Texas Instruments. It is positioned as a system-on-chip solution for applications requiring multiple differential inputs and high accuracy. The device competes with other high-resolution data converters but distinguishes itself through its integrated multiplexer and driver capabilities, reducing bill-of-materials count for multi-channel systems.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult Texas Instruments for current recommended replacements or alternative devices within the ADS8xxx family that may offer updated availability.