ADS8484IRGZT

Analog To Digital Converters (ADC) Overview

The ADS8484IRGZT is an 18-bit, 1.25-MSPS analog-to-digital converter featuring a pseudo-bipolar, fully differential input architecture. It integrates a 4.096-V internal reference and utilizes a capacitor-based SAR structure with inherent sampling. The device supports flexible parallel data output via 18-bit, 16-bit, or 8-bit bus configurations controlled by BUS18/16 and BYTE pins. Operating on a 5-V analog supply (4.75 V to 5.25 V) and a 2.7 V to 5.25 V digital supply, it achieves typical power dissipation of 235 mW at maximum throughput within the -40°C to 85°C industrial temperature range.

Analog To Digital Converters (ADC) Feature Summary

• 18-bit resolution with 1.25-MSPS throughput rate
• Pseudo-bipolar fully differential input range from -Vref to +Vref
• Integrated 4.096-V reference with 6 PPM/°C drift
• Configurable 18-bit, 16-bit, or 8-bit parallel data interface

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific linearity grade required for the application. The IRGZT suffix denotes the ADS8484I variant, which specifies ±4 LSB max INL and ±2 LSB max DNL. Confirm that the package thermal pad is soldered to the PCB to ensure proper thermal performance and mechanical stability as specified in the datasheet.

Analog To Digital Converters (ADC) Selection Notes

Select this component when high-speed conversion is paired with wide dynamic input ranges. The pseudo-bipolar architecture allows inputs spanning negative and positive voltages relative to ground. Ensure the system design accommodates the separate analog (+VA) and digital (+VBD) power supplies, as the device requires distinct voltage domains for optimal noise isolation.

Analog To Digital Converters (ADC) Part Context

This device belongs to the High Speed SAR Converter Family, positioned alongside models such as the ADS8481 and ADS8482. It shares the same 48-lead 7x7 QFN package form factor but distinguishes itself through its specific 1.25-MSPS speed and fully differential input capability compared to other family members.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS8484IBRGZT is a verified substitute offering tighter linearity specifications (±2.5 LSB max INL). Other family members like the ADS8481 offer similar speeds but utilize pseudo-differential inputs rather than fully differential architectures.