DC675B - LT1568CGN Demo Board | Active Filter Building Block IC Configured as 4th Order 500kHz Bandpass
Demonstration circuit DC675B is for the evaluation of filter circuits using an LT®1568. The LT1568 is a dual 2nd order active-RC filter building block with precision ±0.75% capacitors and low noise op amps with 180MHz GBW trimmed to ±10% maximum variation. The ±10% GBW variation of the LT1568 op amps allows for minimizing the higher frequency error by decreasing resistor values. The cutoff or center frequency (fC) range of an LT1568 filter is 200kHz to 10MHz (5MHz for a bandpass filter). The low limit of 200kHz was chosen only to minimize resistor noise and DC offsets (using external capacitors the fC frequency can be less than 200kHz).
Software
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
- LT1568 Demo Circuit - Narrow Passband, 4th Order Bandpass
- LT1568 Demo Circuit - 4th Order Bandpass with External Capacitors
- LT1568 Demo Circuit - Wide Passband, 4th Order Bandpass
- LT1568 Demo Circuit - 4th Order, Butterworth, Lowpass Filter
- LT1568 Demo Circuit - 4th Order, Butterworth, Lowpass Filter (Linear Passband Phase)
- LT1568 Demo Circuit - 4th Order, Elliptic, Lowpass Filter
- LT1568 Demo Circuit - 5th Order, Butterworth, Lowpass Filter
- LT1568 Demo Circuit - 5th Order, Bessel, Lowpass Filter (Linear Passband Phase)
- LT1568 Demo Circuit - 4th Order, Highpass Filter
- LT1568 Demo Circuit - A Squarewave to Differential Sinewave Converter
- 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.
