LT1568

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Very Low Noise, High Frequency Active RC, Filter Building Block

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Part Models
4
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Part Details

  • Up to 10MHz Center Frequency on a Single 3V Supply
  • Easy to Use—A Single Resistor Value Sets Lowpass Cutoff Frequency (200kHz <  fC < 5MHz), Unequal Resistor Values Extend Cutoff Frequency Up to 10MHz
  • Extremely Flexible—Different Resistor Values Allow Lowpass Transfer Functions with or Without Gain
  • SNR = 92dB (fC = 2MHz, 2VP-P)
  • THD = –84dB (fC = 2MHz, 1VP-P)
  • Internal Capacitors Trimmed to ±0.75%
  • Single 4-Pole Lowpass Filter or Matched Pair of 2-Pole Lowpass Filters
  • Can be Connected as a Bandpass Filter
  • Single-Ended or Differential Output
  • Operates from Single 3V (2.7V Min) to ±5V Supply
  • Rail-to-Rail Input and Output Voltages
LT1568
Very Low Noise, High Frequency Active RC, Filter Building Block
Amplitude and Phase Matched Dual Butterworth 2.5MHz Lowpass Filter with Differential Output. Single 3V Supply Operation Amplitude Response Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Tools & Simulations

LTspice 11

Models for the following parts are available in LTspice:

  • LT1568
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC675C

LT1568 Fourth Order Active RC Filter IC

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Product Details

Demonstration circuit DC675C is for the evaluation of filter circuits using an LT1568. The LT1568 is a dual 2nd order active-RCfilterbuildingblockwithprecision ±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).

For testing and evaluation, the DC675C assembly is configured as a single 4th order, 500kHz narrow passband bandpass filter.

For other possible LT1568 configurations, the DC675C has unused pads for 0805 surface mount resistors and capacitors preconfigured with PCB traces to allow for the following high accuracy LT1568 filter circuits:

  1. 4th order lowpass filter
  2. 5th order lowpass filter
  3. 4th order narrow passband bandpass
  4. 4th order wide passband bandpass
  5. 4th order highpass filter

Refer to the LT1568 data sheet for additional information about filter circuit configurations.
DC675C
LT1568 Fourth Order Active RC Filter IC
DC675C

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