LT6604-2.5 - Dual Very Low Noise, Differential Amplifier and 2.5MHz Lowpass Filter

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 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
Typical Application
LT6604-2.5 Typical Application
LT6604-2.5 Typical Application
  • 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
LT6604-2.5 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT6604CUFF-2.5#PBF4x7 QFN-34C$9.30$6.50
LT6604CUFF-2.5#TRPBF4x7 QFN-34C$6.56
LT6604IUFF-2.5#PBF4x7 QFN-34I$10.65$7.45
LT6604IUFF-2.5#TRPBF4x7 QFN-34I$7.51
Demo Boards
Part NumberDescriptionPrice
DC1418A-ALT6604-2.5 | Dual Matched 2.5MHz 4th Order LP Filter Demo Board$125.00
Reliability Data
Product Selector Card
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LT6604-2.5 Footprints and Symbols