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  4. Baseband Differential Low-Pass Filters
  5. LT6604-2.5


Features and Benefits

  • Dual Differential Amplifier with 2.5MHz Lowpass Filters
    • 4th Order Filters
    • Approximates Chebyshev Response
    • Guaranteed Phase and Gain Matching
    • Resistor-Programmable Differential Gain
  • >86dB Signal-to-Noise (3V Supply, 1VRMS Output)
  • Low Distortion (1MHz, 1VRMS Output, 800Ω Load)
    • HD2: 92dBc
    • HD3: 88dBc
  • Specified for Operation with 3V, 5V and ±5V Supplies
  • Fully Differential Inputs and Outputs
  • Adjustable Output Common Mode Voltage
  • Small 4mm × 7mm × 0.75mm QFN Package

Product Details

The LT6604-2.5 consists of two matched, fully differential amplifiers, each with a 4th order, 2.5MHz lowpass filter. The fixed frequency lowpass filter approximates a Chebyshev response. By integrating a filter and a differential amplifier, distortion and noise are made exceptionally low. At unity gain, the measured in-band signal-to-noise ratio is an impressive 86dB. At higher gains, the input referred noise decreases, allowing the part to process smaller input differential signals without significantly degrading the signal-to-noise ratio.

Gain and phase are well matched between the two channels. Gain for each channel is independently programmed using two external resistors. The LT6604-2.5 enables level shifting by providing an adjustable output common mode voltage, making it ideal for directly interfacing to ADCs. The LT6604-2.5 is fully specified for 3V operation. The differential design enables outstanding performance up to a 4VP-P signal level for a single 3V supply.

See the back page of this datasheet for a complete list of related single and dual differential amplifiers with integrated 2.5MHz to 20MHz lowpass filters.


  • Dual Differential ADC Driver and Filter
  • Single-Ended to Differential Converter
  • Matched, Dual, Differential Gain or Filter Stage
  • Common Mode Translation of Differential Signals
  • High Speed ADC Antialiasing and DAC Smoothing in Wireless Infrastructure or Networking Applications
  • High Speed Test and Measurement Equipment
  • Medical Imaging

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LT6604CUFF-2.5#PBF Material Declaration Reliability Data 32-Lead QFN (4mm x 7mm x 0.75mm w/ EP)
LT6604CUFF-2.5#TRPBF Material Declaration Reliability Data 32-Lead QFN (4mm x 7mm x 0.75mm w/ EP)
LT6604IUFF-2.5#PBF Material Declaration Reliability Data 32-Lead QFN (4mm x 7mm x 0.75mm w/ EP)
LT6604IUFF-2.5#TRPBF Material Declaration Reliability Data 32-Lead QFN (4mm x 7mm x 0.75mm w/ EP)
Wafer Fabrication Data R537 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.