1. Products
  2. Amplifiers
  3. Variable Gain Amplifiers (VGA)
  4. Digital Control VGAs
  5. LT5554

Alternative Parts


Features and Benefits

  • 1GHz Bandwidth at all Gains
  • 48dBm OIP3 at 200MHz, 2VP-P into 50Ω, ROUT = 100Ω
  • –88dBc IMD3 at 200MHz, 2VP-P into 50Ω, ROUT = 100Ω
  • 1.4nV/√Hz Input-Referred-Noise (RTI)
  • 20dBm Output P1dB at 70MHz, ROUT = 130Ω
  • 2dB to 18dB Gain Range (ROUT = 50Ω)
  • 0.125dB Gain Step Size
  • 30ps Group Delay Variation
  • 5ns Fast Gain Settling Time
  • 5ns Fast Overdrive Recovery
  • –80dB Reverse Isolation

Product Details

The LT5554 is a 7-bit digitally controlled programmable gain (PG) amplifier with 16dB gain control range. It consists of a 50Ω input variable attenuator, followed by a high linearity variable transconductance amplifier. The coarse 4dB input attenuator step is implemented via 2-bits of digital control (PG5, PG6). The fine transconductance amplifier 0.125dB step within 3.875dB gain control range is set via 5-bits digital control (PG0 to PG4). The LT5554 gain control inputs (PGx) and the STROBE input can be directly coupled to TTL or ECL drivers. The seven parallel gain control inputs time skew can be eliminated by using the STROBE input positive transition.

The internal output resistor RO = 400Ω limits the maximum overall gain to 36dB for open outputs. The internal circuitry of open output collectors enables the LT5554 to be unconditionally stable over any loading conditions (including external SAW filters) and provides –80dB reverse isolation at 300MHz.

The LT5554 is internally protected during overdrive and has an on-chip power supply regulator.

With 0.125dB step resolution and 5ns settling time, the LT5554 is suitable in applications where continuous gain control is required.


  • Differential ADC Driver
  • IF Sampling Receivers
  • VGA IF Power Amplifier
  • 50Ω Driver
  • Instrumentation

Product Categories

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

Design Tool


ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LT5554IUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LT5554IUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Wafer Fabrication Data R409 Reliability Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.