LTC6403CUD-1#PBF

Overview

The LTC6403CUD-1#PBF is a precision, low noise, fully differential input/output amplifier optimized for single supply operation between 2.7V and 5.25V. It features a 200MHz gain-bandwidth product, 200V/µs slew rate, and 2.8nV/√Hz input-referred voltage noise density. The device includes unfiltered outputs (+OUT, –OUT) and built-in filtered outputs (+OUTF, –OUTF) with a 44.2MHz -3dB bandwidth. It draws 10.8mA typical supply current and offers a hardware shutdown feature reducing consumption to 170µA. Packaged in a 3mm × 3mm 16-lead QFN, it operates from 0°C to 70°C.

Feature Summary

• Fully differential architecture with both unfiltered and integrated lowpass filtered output pairs
• Optimized for driving high-resolution ADCs with very low input-referred noise and distortion
• Hardware shutdown capability significantly reduces power consumption when inactive
• Adjustable output common mode voltage via external reference or internal mid-supply bias

Applications

• Differential input analog-to-digital converter (ADC) driver
• Single-ended to differential conversion with common mode level shifting
• Low voltage, low noise signal processing circuits

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range of 0°C to 70°C, distinct from the industrial '-I' grade. Confirm package marking 'LDBM' matches the 16-lead QFN form factor. Ensure supply bypassing meets the recommended 0.1µF ceramic capacitor specifications near V+ and V– pins to maintain performance stability.

Selection Notes

Select this component when a fully differential amplifier with integrated filtering is required for ground-referenced to differential signal translation. It is suitable for systems operating on supplies as low as 2.7V where rail-to-rail output swing is necessary. Consider the 44.2MHz built-in filter if bandwidth requirements align with this cutoff frequency to simplify external component count.

Part Context

This part belongs to the LTC6403 family of wideband differential amplifiers designed for direct ADC interfacing. The 'C' designation specifies the commercial temperature variant, while the 'UD' indicates the 3mm x 3mm QFN package. It complements higher-speed variants like the LTC6409 by offering lower power consumption and integrated filtering for cost-sensitive, moderate-bandwidth applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.