LT6600-2.5 - Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter

The LT6600-2.5 combines a fully differential amplifier with a 4th order 2.5MHz lowpass filter approximating a Chebyshev frequency response. Most differential amplifiers require many precision external components to tail or gain and bandwidth. In contrast, with the LT6600-2.5, two external resistors program differential gain, and the filter’s 2.5MHz cutoff frequency and passband ripple are internally set. The LT6600-2.5 also provides the necessary level shifting to set its output common mode voltage to accommodate the reference voltage requirements of A/Ds.

Using a proprietary internal architecture, the LT6600-2.5 integrates an antialiasing filter and a differential amplifier/driver without compromising distortion or low noise performance. At unity gain the measured in band signal-to- noise ratio is an impressive 86dB. At higher gains the input referred noise decreases so the part can process smaller input differential signals without significantly degrading the output signal-to-noise ratio.

For similar devices with higher cutoff frequency, refer to the LT6600-5, LT6600-10, LT6600-15 and LT6600-20 data sheets.

  • ±0.6dB (Max) Ripple 4th Order Lowpass Filter with 2.5MHz Cutoff
  • Programmable Differential Gain via Two External Resistors
  • Adjustable Output Common Mode Voltage
  • Operates and Specified with 3V, 5V, ±5V Supplies
  • 86dB S/N with 3V Supply and 1VRMS Output
  • Low Distortion, 1VRMS, 800Ω Load 1MHz: 95dBc 2nd, 88dBc 3rd
  • Fully Differential Inputs and Outputs
  • Compatible with Popular Differential Amplifier Pinouts
  • SO-8 and DFN-12 Packages
Typical Application
LT6600-2.5 Typical Application
LT6600-2.5 Typical Application
LT6600-2.5 Typical Application
  • High Speed ADC Antialiasing and DAC Smoothing in Networking or Cellular Basestation Applications
  • High Speed Test and Measurement Equipment
  • Medical Imaging
  • Drop-in Replacement for Differential Amplifiers
LT6600-2.5 Package Drawing
LT6600-2.5 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT6600CDF-2.5#PBF4x4 DFN-12C$3.80$2.95
LT6600CDF-2.5#TRPBF4x4 DFN-12C$3.01
LT6600IDF-2.5#PBF4x4 DFN-12I$4.35$3.40
LT6600IDF-2.5#TRPBF4x4 DFN-12I$3.46
Demo Boards
Part NumberDescriptionPrice
DC962A-ALT6600-2.5 Fc=2.5MHz$75.00
Application Note
Reliability Data
Product Selector Card
CAD Symbol
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LT6600-2.5 Footprints and Symbols