LTC1069-6 - Single Supply, Very Low Power, Elliptic Lowpass Filter


  • 8th Order Elliptic Filter in SO-8 Package
  • Single 3V Operation: Supply Current: 1mA (Typ) fCUTOFF: 14kHz (Max) S/N Ratio: 72dB
  • Single 5V Operation:Supply Current: 1.2mA (Typ)fCUTOFF: 20kHz (Max)S/N Ratio: 79dB
  • ±0.1dB Passband Ripple Up to 0.9fCUTOFF (Typ)
  • 42dB Attenuation at 1.3fCUTOFF
  • 66dB Attenuation at 2.0fCUTOFF
  • 70dB Attenuation at 2.1fCUTOFF
  • Wide Dynamic Range, 75dB or More (S/N + THD),Under Single 5V Operation
  • Wideband Noise: 120µVRMS
  • Clock-to-fCUTOFF Ratio: 50:1
  • Internal Sample Rate: 100:1

Typical Application

LTC1069-6 Typical Application
LTC1069-6 Typical Application


The LTC1069-6 is a monolithic low power, 8th order lowpass filter optimized for single 3V or single 5V supply operation. The LTC1069-6 typically consumes 1mA under single 3V supply operation and 1.2mA under 5V operation.

The cutoff frequency of the LTC1069-6 is clock tunable and it is equal to the clock frequency divided by 50. The input signal is sampled twice per clock cycle to lower the risk of aliasing.

The typical passband ripple is ± 0.1dB up to 0.9fCUTOFF. The gain at fCUTOFF is –0.7dB. The transition band of the LTC1069-6 features progressive attenuation reaching 42dB at 1.3fCUTOFF and 70dB at 2.1fCUTOFF. The maximum stopband attenuation is 72dB.

The LTC1069-6 can be clock tuned for cutoff frequencies up to 20kHz (single 5V supply) and for cutoff frequencies up to 14kHz (single 3V supply).

The low power feature of the LTC1069-6 does not penalize the device’s dynamic range. With single 5V supply and an input range of 0.4VRMS to 1.4VRMS, the Signal-to- (Noise + THD) ratio is ≥70dB. The wideband noise of the LTC1069-6 is 125μVRMS.

Other filter responses with higher speed can be obtained. Please contact LTC Marketing for details.

The LTC1069-6 is available in an 8-pin SO package.


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
LTC1069-6CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1069-6CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1069-6IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1069-6IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LTC1069-6 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
LTC1069-6CS8#PBF SO-8 C $6.25 $4.80 Yes
LTC1069-6CS8#TRPBF SO-8 C $4.86 Yes
LTC1069-6IS8#PBF SO-8 I $6.85 $5.25 Yes
LTC1069-6IS8#TRPBF SO-8 I $5.31 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.

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