Features and Benefits
- 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.
- 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
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
R042 Reliability Data3/23/2018
Audio Spectrum Analyzer with the Linduino4/12/2016
Sharp Gain Roll-Offs Using the LTC1562 Quad Operational Filter IC (Part 3)11/1/1999 LT Journal
Clock-Tunable, High Accuracy, Quad 2nd Order, Analog Filter Building Blocks8/1/1998 LT Journal
High Clock-to-Center Frequency Ratio LTC1068-200 Extends Capabilities of Switched Capacitor Highpass Filter2/1/1998 LT Journal
Tools & Simulations
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Models for the following parts are available in LTspice:
LTC1068 Companion Parts
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