ADS8481IRGZT

Analog To Digital Converters (ADC) Overview

The ADS8481IRGZT is an 18-bit, 1-MSPS analog-to-digital converter (ADC) featuring a pseudo-differential unipolar input and a parallel interface. It integrates a 4.096-V internal reference and utilizes a capacitor-based SAR architecture with inherent sample-and-hold functionality. The device supports 18-bit, 16-bit, or 8-bit data bus transfers via the BUS18/16 and BYTE pins. Operating over an industrial temperature range of -40°C to 85°C, it consumes 220 mW at 1 MSPS with the internal reference enabled. Key specifications include a maximum integral nonlinearity of ±5 LSBs for the 'I' grade and a typical signal-to-noise ratio of 92 dB.

Analog To Digital Converters (ADC) Feature Summary

• 18-bit resolution with 1 MSPS throughput rate
• Integrated 4.096-V internal voltage reference
• Pseudo-differential unipolar single-ended input range
• Flexible parallel data output: 18-bit, 16-bit, or 8-bit modes
• Low offset error drift of ±0.2 ppm/°C

Analog To Digital Converters (ADC) Applications

• Medical instruments
• Optical networking equipment
• Transducer interfaces
• High-accuracy data acquisition systems
• Magnetometers

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix against the manufacturer's current documentation to confirm package type and tape/reel quantity. The IRGZT designation indicates a QFN package; however, ordering information lists both RGZT (250 units) and RGZR (1000 units) variants. Ensure the selected media matches the required production volume and that the component meets RoHS compliance standards as indicated in the datasheet.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS8481IRGZT when an 18-bit resolution and 1 MSPS sampling rate are required for unipolar signals. The 'I' grade specifies a maximum integral nonlinearity of ±5 LSBs. Consider the integrated reference if board space is limited, noting the 120 ms start-up time. For bipolar inputs, the ADS8482 variant is required. Verify that the host system can accommodate the parallel interface timing requirements and power consumption levels.

Analog To Digital Converters (ADC) Part Context

The ADS8481 belongs to Texas Instruments' high-speed SAR converter family, which includes models such as the ADS8383, ADS8472, and ADS8482. These devices share similar SAR architectures but vary in resolution, speed, and input configurations. The ADS8481 specifically targets applications requiring high accuracy with a unipolar input range, distinguishing it from fully differential or bipolar counterparts in the same series.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS8481IBRGZT is a verified substitute within the same package offering tighter linearity specifications (±3.5 LSB INL). The ADS8482IRGZT provides a similar form factor but supports bipolar inputs instead of unipolar. Direct pin-compatible replacements must be validated against the specific input range and linearity requirements of the design.