ISL21009BFB812Z

Overview

The ISL21009BFB812Z is a high voltage input precision voltage reference utilizing Intersil's proprietary Floating Gate Analog (FGA) technology. It provides a fixed output voltage of 1.25V with an initial accuracy of ±0.5mV and a temperature coefficient of 3ppm/°C. The device operates within an input voltage range of 3.5V to 16.5V, consuming a maximum supply current of 180µA. It features low output noise of 4.5µV P-P in the 0.1Hz to 10Hz bandwidth and supports an output current capability up to ±7.0mA. The component is housed in an 8-lead SOIC package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Utilizes proprietary Floating Gate Analog technology for extremely low power consumption and minimal temperature drift.
• Delivers high DC precision with guaranteed initial accuracy as low as ±0.5mV.
• Features ultra-low output noise performance suitable for sensitive analog signal chains.
• Includes a dedicated TRIM pin allowing user adjustment of the output voltage by approximately ±2.5%.

Applications

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

Procurement Notes

Verify that the specific part number matches the required output voltage, accuracy grade, and temperature coefficient specifications. Confirm the package type and lead configuration align with the PCB footprint requirements. Ensure compliance with RoHS standards and check for any specific handling precautions related to electrostatic discharge during procurement and storage.

Selection Notes

Select this component when designing systems requiring high precision voltage references with exceptionally low power consumption. The FGA technology makes it suitable for battery-powered portable instruments where minimizing supply current is critical. Consider the low noise characteristics for applications involving high-resolution data acquisition or sensitive sensor interfaces.

Part Context

The ISL21009 series belongs to Renesas' (formerly Intersil) FGA™ voltage reference family. This line leverages floating gate CMOS processes to achieve unique stability and low drift characteristics not typically found in standard bandgap references. The ISL21009BFB812Z represents a specific variant within this family optimized for 1.25V output with high initial accuracy.

Replacement Considerations

Direct replacements include other variants within the ISL21009 family such as the ISL21009CFB812Z or ISL21009DFB812Z, which offer different accuracy grades and temperature coefficients while maintaining the same pinout and functionality.

FAQ

How can the output voltage be adjusted?

The output voltage can be trimmed up or down 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 is the recommended approach for handling capacitive loads?

For load capacitances above 0.001µF, an RC noise reduction network is recommended to maintain stability and improve transient response. Output capacitor values greater than 1.0µF are not recommended without this network.