LTC1065 Datasheet | Linear Technology

DC Accurate, Clock-Tunable Linear Phase 5th Order Bessel Lowpass Filter Features - Clock-Tunable Cutoff Frequency - 1m V DC Offset (Typical) - 80d B CMR (Typical) - Internal or External Clock - 50µVRMS Clock Feedthrough - 100:1 Clock-to-Cutoff Frequency Ratio - 80µVRMS Total Wideband Noise - 0.004% Noise + THD at 2VRMS Output Level - 50k Hz 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 U APPLICATIO S - Audio - Strain Gauge Amplifiers - Anti-Aliasing Filters - Low Level Filtering - Digital Voltmeters - Smoothing Filters - Reconstruction Filters , 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. DESCRIPTIO 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 1m V 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 80d B. The filter cutoff frequency is controlled either by an internal or external clock. The clock-to-cutoff frequency ratio is 100 : 1. The on-board clock is nearly power supply independent and it is programmed via an external RC. The 50µVRMS clock feedthrough of the device is considerably lower than other existing monolithic filters. The LTC1065 wideband noise is 80µVRMS and it can process large AC input signals with low distortion. With ±7.5V supplies, for instance, the filter handles up to 4VRMS (94d B S/N ratio) while the standard 1k Hz THD is below 0.005%; 87d B dynamic range (S/N + THD) is obtained with input levels between 2VRMS and 2.5VRMS. The LTC1065 is...