LTC1565-31 - 650kHz Continuous Time, Linear Phase Lowpass Filter


  • 7th Order, 650kHz Linear Phase Filter in an SO-8
  • Differential Inputs and Outputs
  • Operates on a Single 5V or a ±5V Supply
  • Low Offset: 5mV Typical
  • 75dB THD and SNR
  • 78dB SNR
  • Shutdown Mode
  • Requires No External Components
  • Requires No External Clock Signal

Typical Application

LTC1565-31 Typical Application
LTC1565-31 Typical Application


The LTC1565-31 is a 7th order, continuous time, linear phase lowpass filter. The selectivity of the LTC1565-31, combined with its linear phase and dynamic range, make it suitable for filtering in data communications or data acquisition systems. The filter attenuation is 36dB at 2× fCUTOFF and at least 72dB for frequencies above 3× fCUTOFF. Unlike comparable LC filters, the LTC1565-31 achieves this selectivity with a linear phase response in the passband.

 With 5% accuracy of the cutoff frequency, the LTC1565-31 can be used in applications requiring pairs of matched filters, such as transceiver I and Q channels. Furthermore, the differential inputs and outputs provide a simple interface for these wireless systems.

With a single 5V supply and a 2VP-P input, the LTC1565-31 features an impressive spurious free dynamic range of 75dB. The maximum signal-to-noise ratio is 78dB and it is achieved with a 2.5VP-P input signal.

The LTC1565-31 features a shutdown mode where power supply current is typically less than 10μA. For W-CDMA, 3G, CDMA 2000 and other cellular and noncellular cutoff frequencies or single-ended I/O, please contact LTC Marketing for additional information.


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
LTC1565-31CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1565-31CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1565-31IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1565-31IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LTC1565-31 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
LTC1565-31CS8#PBF SO-8 C $4.30 $3.65 Yes
LTC1565-31CS8#TRPBF SO-8 C $3.71 Yes
LTC1565-31IS8#PBF SO-8 I $4.93 $4.25 Yes
LTC1565-31IS8#TRPBF SO-8 I $4.31 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.

Click here to view our complete list of demo boards


  • CDMA Basestations
  • Data Communications
  • Antialiasing Filters
  • Smoothing or Reconstruction Filters
  • Matched Filter Pairs
  • Replacement for LC Filters

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