LTC6401CUD-20#PBF

Overview

The LTC6401CUD-20#PBF is a high-speed differential amplifier designed for processing signals from DC to 140MHz. It features a fixed gain of 20dB (10V/V) and a 1.3GHz -3dB bandwidth. The device operates on a single supply voltage ranging from 2.85V to 3.5V, drawing a typical supply current of 50mA. It provides differential inputs and outputs with an input impedance of 200Ω. Key performance metrics include a total input noise density of 2.1nV/√Hz and a noise figure of 6.2dB at 10MHz.

Feature Summary

• Fixed internal gain of 20dB simplifies circuit design by eliminating external feedback components.
• Integrated output common mode control allows direct interfacing with ADCs without transformers or AC-coupling capacitors.
• Differential architecture ensures low distortion and high linearity for precision signal processing.
• Compact 16-lead QFN package minimizes board space requirements.

Applications

• Driving 12-, 14-, and 16-bit Analog-to-Digital Converters
• IF Sampling Receivers
• SAW Filter Interfacing
• Single-ended to Differential Conversion

Procurement Notes

Verify the suffix 'C' indicates a commercial temperature range (0°C to 70°C), distinct from the industrial grade 'I'. Confirm the '#PBF' designation specifies lead-free finish and tube packaging. Ensure the source impedance matches the 200Ω differential input requirement or includes appropriate termination networks.

Selection Notes

Select this component when a fixed 20dB gain is required for IF frequencies up to 140MHz. Compare against the LTC6400 family if lower distortion is prioritized over power consumption. Consider the LTC6401-8 or LTC6401-14 if different gain levels are necessary for the specific application bandwidth.

Part Context

This part belongs to the LTC6401 family of low noise, low distortion differential ADC drivers. It is pin-compatible with the LTC6400 series, which offers lower distortion but higher power consumption. The C-grade variant is optimized for commercial applications, while the I-grade covers the full industrial temperature range.

Replacement Considerations

LTC6401IUD-20#PBF serves as the industrial temperature grade equivalent. For lower distortion requirements, consider the LTC6400CUD-20#PBF, noting its higher supply current. Other gain variants within the LTC6401 family may be suitable if gain adjustments are permissible.