LTC1068 - Clock-Tunable, Quad Second Order, Filter Building Blocks

Features

  • Four Identical 2nd Order Filter Sections in an SSOP Package
  • 2nd Order Section Center Frequency Error:
    ±0.3% Typical and ±0.8% Maximum
  • Low Noise per 2nd Order Section, Q ≤ 5:
    LTC1068-200 50µVRMS, LTC1068 50µVRMS
    LTC1068-50 70µVRMS, LTC1068-25 90µVRMS
  • Low Power Supply Current: 4.5mA, Single 5V,
    LTC1068-50
  • Operation with ±5V Power Supply, Single 5V Supply or Single 3.3V Supply

Typical Application

LTC1068 Typical Application
LTC1068 Typical Application

Description

The LTC1068 product family consists of four monolithic clock-tunable filter building blocks. Each product contains four matched, low noise, high accuracy 2nd order switched-capacitor filter sections. An external clock tunes the center frequency of each 2nd order filter section. The LTC1068 products differ only in their clock-to-center frequency ratio. The clock-to-center frequency ratio is set to 200:1 (LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or 25:1 (LTC1068-25). External resistors can modify the clock-to-center frequency ratio. High performance, quad 2nd order, dual 4th order or 8th order filters can be designed with an LTC1068 family product. Designing filters with an LTC1068 product is fully supported by FilterCAD™ filter design software for Windows®. The LTC1068 products are available in a 28-pin SSOP surface mount package. A customized version of an LTC1068 family product can be obtained in a 16-lead SO package with internal thin-film resistors. Please contact LTC Marketing for details.

Packaging

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
Drawing
RoHS
LTC1068-200CG#PBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068-200CG#TRPBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068-200IG#PBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068-200IG#TRPBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068-25CG#PBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068-25CG#TRPBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068-25IG#PBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068-25IG#TRPBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068-50CG#PBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068-50CG#TRPBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068-50IG#PBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068-50IG#TRPBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068CG#PBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068CG#TRPBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC1068CN#PBF N-24 N C 05-08-1510 (N24) Yes
LTC1068IG#PBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068IG#TRPBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC1068IN#PBF N-24 N I 05-08-1510 (N24) Yes


LTC1068 Package Drawing
LTC1068 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
(1-99)
Price
(1k)*
RoHS
LTC1068-200CG#PBF SSOP-28 C $7.05 $6.35 Yes
LTC1068-200CG#TRPBF SSOP-28 C $6.45 Yes
LTC1068-200IG#PBF SSOP-28 I $7.70 $6.95 Yes
LTC1068-200IG#TRPBF SSOP-28 I $7.05 Yes
LTC1068-25CG#PBF SSOP-28 C $7.05 $6.35 Yes
LTC1068-25CG#TRPBF SSOP-28 C $6.45 Yes
LTC1068-25IG#PBF SSOP-28 I $7.70 $6.95 Yes
LTC1068-25IG#TRPBF SSOP-28 I $7.05 Yes
LTC1068-50CG#PBF SSOP-28 C $7.05 $6.35 Yes
LTC1068-50CG#TRPBF SSOP-28 C $6.45 Yes
LTC1068-50IG#PBF SSOP-28 I $7.70 $6.95 Yes
LTC1068-50IG#TRPBF SSOP-28 I $7.05 Yes
LTC1068CG#PBF SSOP-28 C $7.05 $6.35 Yes
LTC1068CG#TRPBF SSOP-28 C $6.45 Yes
LTC1068CN#PBF N-24 C $6.85 $6.15 Yes
LTC1068IG#PBF SSOP-28 I $7.70 $6.95 Yes
LTC1068IG#TRPBF SSOP-28 I $7.05 Yes
LTC1068IN#PBF N-24 I $7.50 $6.75 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
DC104B-A LTC1068CG | UNIVERSAL LOW NOISE 8TH ORDER FILTER BUILDING BLOCK (100:1, fc to 50KHz) $50.00
DC104B-B LTC1068-200CG | UNIVERSAL LOW NOISE 8TH ORDER FILTER BUILDING BLOCK (200:1, fc to 25KHz) $50.00
DC104B-C LTC1068-25CG | UNIVERSAL HIGH SPEED 8TH ORDER FILTER BUILDING BLOCK (25:1, fc to 200KHz) $50.00
DC104B-D LTC1068-50CG | UNIVERSAL LOW POWER 8TH ORDER FILTER BUILDING BLOCK (50:1, fc to 25KHz) $50.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Lowpass or Highpass Filters:
    LTC1068-200, 0.5Hz to
    25kHz; LTC1068, 1Hz to 50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25, 4Hz to 200kHz
  • Bandpass or Bandreject (Notch) Filters:
    LTC1068-200, 0.5Hz to 15kHz; LTC1068, 1Hz to 30kHz; LTC1068-50, 2Hz to 30kHz; LTC1068-25, 4Hz to 140kHz

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC1068
LTC1068-200
LTC1068-25
LTC1068-50

Technical Support