REF7040QDGKR

Overview

The REF7040QDGKR is a precision voltage reference from Texas Instruments offering a nominal output of 4.096 V in an 8-pin VSSOP package. It features low noise performance with 0.23 ppm p-p at 0.1 Hz to 10 Hz and 0.35 ppm rms at 10 Hz to 1 kHz. The device maintains high accuracy within ±0.025% maximum and exhibits a temperature drift coefficient of 2 ppm/°C over the -40°C to +125°C range. It supports input voltages up to 18 V, provides ±10 mA output current, and includes an enable pin for shutdown control.

Feature Summary

• Ultra-low noise performance enables high-precision measurements in sensitive signal chains
• Hermetic ceramic LCCC option available for applications requiring extended long-term stability without calibration
• Wide operating temperature range supports diverse industrial environments
• Flexible solution with stable operation across a broad range of output capacitors

Applications

• Semiconductor test equipment
• Precision data acquisition systems
• Ultrasound scanners
• X-ray systems
• Industrial instrumentation

Procurement Notes

Verify the specific suffix QDGKR confirms the VSSOP package and automotive-grade qualification when sourcing. Confirm the output voltage variant matches the required 4.096 V specification. Ensure compatibility with the target PCB footprint for the 8-pin VSSOP form factor. Check for any recent documentation updates regarding thermal or electrical characteristics before finalizing design integration.

Selection Notes

Select this component for designs demanding minimal noise contribution in high-resolution analog front ends. The VSSOP package offers a compact solution compared to the hermetic LCCC option. Consider the dropout voltage requirements relative to the supply rail. Evaluate the need for the enable feature if power management during idle states is critical for the system architecture.

Part Context

This part belongs to the REF70 family of high-precision series voltage references designed for test and measurement applications. The family includes various output voltage options and package types, including hermetic ceramic and plastic surface-mount variants. The REF70 series is engineered to pair with high-resolution data converters to optimize overall signal chain performance in demanding environments.

Replacement Considerations

REF7040QFKHT is the hermetic LCCC package equivalent within the same product family.