LT5554IUH#PBF

Video Amps And Modules Overview

The LT5554IUH#PBF is a broadband, ultra-low distortion, 7-bit digitally controlled programmable gain amplifier (VGA) from Analog Devices. It features a 16dB gain control range with 0.125dB step resolution and operates up to 1GHz bandwidth at all gains. The device integrates a 50Ω input variable attenuator and a high linearity variable transconductance amplifier. Key electrical specifications include a typical OIP3 of 48dBm at 200MHz, an output P1dB of 20dBm, and a noise figure of 10.5dB. It utilizes TTL or ECL compatible digital inputs for gain setting via PGx pins and a STROBE input.

Video Amps And Modules Feature Summary

• Features a 7-bit digitally controlled architecture combining coarse 4dB steps and fine 0.125dB steps for precise gain adjustment.
• Provides ultra-low distortion performance with high linearity metrics including high OIP3 and low IMD3 across the operating frequency range.
• Incorporates internal overdrive protection and an on-chip power supply regulator for robust operation under varying signal conditions.
• Ensures unconditional stability with open-collector outputs and provides high reverse isolation suitable for complex loading environments.

Video Amps And Modules Applications

• Differential ADC Driver
• IF Sampling Receivers
• VGA IF Power Amplifier

Video Amps And Modules Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free finish and RoHS compliance when sourcing. Confirm the package type matches the 32-lead QFN footprint requirements for your PCB layout. Ensure the voltage levels on PGx and STROBE inputs align with your system's logic family, as they support both DC and AC coupling modes depending on the MODE pin configuration.

Video Amps And Modules Selection Notes

Select this component when continuous, high-resolution gain control is required in RF or IF signal chains. It is suitable for applications demanding wide dynamic range and fast settling times. Consider the differential output structure and internal 400Ω output resistance when designing matching networks. Verify that the 5V supply requirement fits within your system's power budget.

Video Amps And Modules Part Context

This part belongs to the LT5554 series of programmable gain amplifiers designed for broadband applications. It is manufactured by Analog Devices Inc. and is housed in a 32-lead plastic QFN package measuring 5mm x 5mm. The device is intended for use in communication systems requiring precise amplitude control.

Video Amps And Modules Replacement Considerations

LT5554IUH#TRPBF is the tape and reel version of the same component.

Video Amps And Modules FAQ

How is the gain updated on the LT5554?

Gain is updated using seven parallel digital control inputs (PG0-PG6). A positive transition on the STROBE input latches the state of the PGx inputs to update the amplifier gain.

What is the function of the MODE pin?

The MODE pin controls the functionality and level of the PGx and STROBE inputs. When driven high, inputs are DC-coupled; when low, they are AC-coupled.