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LTC1065 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1065 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC1065 1065fb ■ Clock-Tunable Cutoff Frequency ■ 1mV DC Offset (Typical) ■ 80dB CMR (Typical) ■ Internal or External Clock ■ 50 µVRMS Clock Feedthrough ■ 100:1 Clock-to-Cutoff Frequency Ratio ■ 80 µVRMS Total Wideband Noise ■ 0.004% Noise + THD at 2VRMS Output Level ■ 50kHz Maximum Cutoff Frequency ■ Cascadable for Faster Roll-Off ■ Operates from ±2.375 to ±8V Power Supplies ■ Self-Clocking with 1 RC ■ Available in 8-Pin DIP and 16-Pin SW Packages The LTC ®1065 is the first monolithic filter providing both clock-tunability with low DC output offset and over 12-bit DC accuracy. The frequency response of the LTC1065 closely approximates a 5th order Bessel polynomial. With appropriate PCB layout techniques the output DC offset is typically 1mV and is constant over a wide range of clock frequencies. With ±5V supplies and ±4V input voltage range, the CMR of the device is typically 80dB. The filter cutoff frequency is controlled either by an inter- nal or external clock. The clock-to-cutoff frequency ratio is 100 : 1. The on-board clock is nearly power supply inde- pendent and it is programmed via an external RC. The 50 µVRMS clock feedthrough of the device is considerably lower than other existing monolithic filters. The LTC1065 wideband noise is 80 µVRMS and it can process large AC input signals with low distortion. With ±7.5V supplies, for instance, the filter handles up to 4VRMS (94dB S/N ratio) while the standard 1kHz THD is below 0.005%; 87dB dynamic range (S/N + THD) is ob- tained with input levels between 2VRMS and 2.5VRMS. The LTC1065 is available in 8-pin miniDIP and 16-pin SW packages. For a Butterworth response, see LTC1063 data sheet. The LTC1065 is pin compatible with the LTC1063. APPLICATIO S TYPICAL APPLICATIO DESCRIPTIO FEATURES DC Accurate, Clock-Tunable Linear Phase 5th Order Bessel Lowpass Filter 3.4kHz Single 5V Supply Bessel Lowpass Filter ■ Audio ■ Strain Gauge Amplifiers ■ Anti-Aliasing Filters ■ Low Level Filtering ■ Digital Voltmeters ■ Smoothing Filters ■ Reconstruction Filters VIN 4.53k 13k* 5V 0.1 µF VOUT 1065 TA01 SELF-CLOCKING SCHEME * 200pF* 1 2 3 4 8 7 6 5 LTC1065 0.1 µF 5V 4.99k + 1 µF TANT Frequency Response FREQUENCY (kHz) 1 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 10 100 1065 TA01b , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 4857860. |
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