LTC1068

PRODUCTION

Clock-Tunable, Quad Second Order, Filter Building Blocks

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Overview

  • 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

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.

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
LTC1068
Clock-Tunable, Quad Second Order, Filter Building Blocks
Dual, Matched, 4th Order Butterworth Lowpass Filters, Clock-Tunable Up to 200kHz f – 3dB = fCLK/25, 4th Order Filter Noise = 60µVRMS Gain vs Frequency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 4

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Oscillators 2
LTC6900
PRODUCTION Low Power, 1kHz to 20MHz Resistor Set SOT-23 Oscillator
LTC6930-X.XX
32.768kHz to 8.192MHz Precision µPower Oscillators
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC1068
  • LTC1068-200
  • LTC1068-25
  • LTC1068-50
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
DC104B-B
LTC1068-200CG | Universal Low Noise 8th Order Filter Building Block (200:1, fc to 25KHz)
DC104B-C
LTC1068-25CG | Universal High Speed 8th Order Filter Building Block (25:1, fc to 200KHz)
DC104B-D
LTC1068-50CG | Universal Low Power 8th Order Filter Building Block (50:1, fc to 25KHz)
DC104B-A
LTC1068CG | Universal Low Noise 8th Order Filter Building Block (100:1, fc to 50KHz)

Latest Discussions

1 Years Ago
Gain Amplitude
1 Years Ago
The bandpass frequency band and gain of the filter designed by LTC1068 have significant differences in simulation and onboard characteristics
2 Years Ago
LTC1068
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