LT6600-20 - Very Low Noise, Differential Amplifier and 20MHz Lowpass Filter


  • Programmable Differential Gain via Two External Resistors
  • Adjustable Output Common Mode Voltage
  • Operates and Specified with 3V, 5V, ±5V Supplies
  • 0.5dB Ripple 4th Order Lowpass Filter with 20MHz Cutoff
  • 76dB S/N with 3V Supply and 2VP-P Output
  • Low Distortion, 2VP-P, 800 Ohm Load
    2.5MHz: 83dBc 2nd, 88dBc 3rd
    20MHz: 63dBc 2nd, 64dBc 3rd
  • Fully Differential Inputs and Outputs
  • SO-8 Package
  • Compatible with Popular Differential Amplifier Pinouts

Typical Application

LT6600-20 Typical Application
LT6600-20 Typical Application


The LT6600-20 combines a fully differential amplifier with a 4th order 20MHz lowpass filter approximating a Chebyshev frequency response. Most differential amplifiers require many precision external components to tailor gain and bandwidth. In contrast, with the LT6600-20, two external resistors program differential gain, and the filter’s 20MHz cutoff frequency and passband ripple are internally set. The LT6600-20 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 LT6600-20 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 76dB. 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.

The LT6600-20 also features low voltage operation. The differential design provides outstanding performance for a 2VP-P signal level while the part operates with a single 3V supply.

The LT6600-20 is packaged in an SO-8 and is pin compatible with stand alone differential amplifiers.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT6600CS8-20#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT6600CS8-20#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT6600IS8-20#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT6600IS8-20#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LT6600-20 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT6600CS8-20#PBF SO-8 C $3.80 $2.95 Yes
LT6600CS8-20#TRPBF SO-8 C $3.01 Yes
LT6600IS8-20#PBF SO-8 I $4.35 $3.40 Yes
LT6600IS8-20#TRPBF SO-8 I $3.46 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC962A-E LT6600-20 Fc=20MHz $75.00
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Click here to view our complete list of demo boards


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  • Drop-in Replacement for Differential Amplifiers

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