ISL21009CFB850Z

Overview

The ISL21009CFB850Z is a high precision, low noise voltage reference utilizing Intersil’s proprietary Floating Gate Analog (FGA) technology. It provides a fixed output of 5.000V with an initial accuracy of ±1.0mV and a temperature coefficient of 5ppm/°C. The device operates within an input voltage range of 3.5V to 16.5V, consuming a maximum supply current of 180µA. Output noise is typically 4.5µV P-P from 0.1Hz to 10Hz. It supports up to ±7.0mA output current and functions across a temperature range of -40°C to +125°C in an 8-lead SOIC package.

Feature Summary

• Utilizes proprietary Floating Gate Analog technology for extremely low power consumption and high stability.
• Delivers high DC precision with guaranteed initial accuracy and low temperature drift characteristics.
• Features ultra-low output noise performance suitable for sensitive analog signal chains.
• Includes a dedicated TRIM pin allowing for user-adjustable output voltage compensation.

Applications

• High resolution A/Ds and D/As
• Digital Meters
• Industrial Instrumentation Equipment

Procurement Notes

Verify the specific suffix 'CFB850Z' against the manufacturer's official ordering guide to confirm the 5.000V output option, ±1.0mV accuracy grade, and 5ppm/°C temperature coefficient. Ensure the package type matches the required 8 Ld SOIC footprint. Confirm RoHS compliance status and check for any product change notifications or end-of-life notices associated with this specific part number before finalizing procurement plans.

Selection Notes

Select this component when a stable 5.000V reference is required with moderate precision and low quiescent current. The 5ppm/°C temperature coefficient offers a balance between cost and performance compared to tighter grades. Consider the 180µA maximum supply current for battery-powered applications. Evaluate the need for the trim function if system-level calibration is necessary to compensate for PCB assembly shifts or long-term drift.

Part Context

This device belongs to the ISL21009 FGA™ voltage reference family, which includes options for 1.250V, 2.500V, 4.096V, and 5.000V outputs. Variants are distinguished by accuracy grades (±0.5mV, ±1.0mV, ±2.0mV) and temperature coefficients (3ppm/°C, 5ppm/°C, 10ppm/°C). All members share the same 8-lead SOIC package and core FGA technology architecture.

Replacement Considerations

Direct substitutes include other ISL21009 variants such as ISL21009BFB850Z (±0.5mV, 3ppm/°C) or ISL21009DFB850Z (±2.0mV, 10ppm/°C) if accuracy specifications allow. Cross-family replacements require matching output voltage, package, and electrical parameters.

FAQ

How can the output voltage be adjusted?

The output voltage can be adjusted by approximately ±2.5% using the TRIM pin. This is achieved by connecting a potentiometer between VOUT and GND, with the wiper connected to the TRIM pin.

What precautions are needed regarding X-ray exposure?

X-ray inspection or screening can cause permanent changes in the output voltage due to the floating gate technology. If X-ray exposure is unavoidable, shielding with copper or aluminum is recommended to protect the device accuracy.