LTC6403IUD-1#PBF

Overview

The LTC6403IUD-1#PBF is a precision, fully differential amplifier with low noise and low distortion, optimized for single-supply operation between 2.7V and 5.25V. It features a 200MHz gain-bandwidth product and an input-referred voltage noise of 2.8nV/√Hz. The device includes unfiltered outputs (+OUT, –OUT) and built-in filtered outputs (+OUTF, –OUTF) with a 44.2MHz differential single-pole lowpass filter. It draws 10.8mA in active mode and reduces to 170µA in shutdown. The component operates over a temperature range of –40°C to 85°C and is housed in a 3mm × 3mm 16-pin QFN package.

Feature Summary

• Fully differential input and output architecture with adjustable output common mode voltage
• Integrated 44.2MHz differential lowpass filter on dedicated filtered output pins
• Hardware shutdown feature significantly reducing power consumption
• Rail-to-rail output swing capability with large output current drive

Applications

• Differential input analog-to-digital converter driver
• Single-ended to differential conversion and amplification
• Common mode level translation
• Low voltage, low noise signal processing

Procurement Notes

Verify the suffix IUD-1 corresponds to the industrial temperature grade (–40°C to 85°C) and PBF indicates lead-free finish. Confirm the package is the 16-lead 3mm × 3mm plastic QFN. Ensure the source document matches the specific part number for accurate electrical characterization data.

Selection Notes

Select this component when driving 14- to 18-bit ADCs requiring low noise and high linearity. It is suitable for applications needing simultaneous filtered and unfiltered outputs. Consider the 2.7V minimum supply voltage for low-power systems. Verify that the 200MHz bandwidth meets the signal frequency requirements.

Part Context

This part belongs to the LTC6403-1 family of wideband, low-noise differential amplifiers. The 'I' designation specifies the industrial temperature range variant. It serves as a bridge between single-ended sources and differential ADC inputs, offering phase balancing and even-order harmonic cancellation inherent to differential topologies.

Replacement Considerations

LTC6403CUD-1#PBF (Commercial temp), LTC6403HUD-1#PBF (High temp).

FAQ

What is the function of the +OUTF and –OUTF pins?

These pins provide filtered versions of the main outputs, featuring a built-in 44.2MHz differential single-pole lowpass filter created by internal RC components.

How is the output common mode voltage controlled?

The VOCM pin sets the output common mode level. If left open, it defaults to mid-supply; otherwise, it can be driven by an external reference voltage.