LTC1064-2

U U LTC1064-2 Low Noise, High Frequency, 8th Order Butterworth Lowpass Filter FEATURES ■ 8th Order Filter in a 14-Pin Package ■ 140kHz Maximum Corner Frequency ■ No External Components ■ 50:1 and 100:1 Clock to Cutoff Frequency Ratio ■ 80µVRMS Total Wideband Noise ■ 0.03% THD or Better ■ Operates from ±2.37V to ±8V Power Supplies U APPLICATIO S ■ Antialiasing Filters ■ Smoothing Filters ■ Tracking High Frequency Lowpass Filters DESCRIPTIO The LTC®1064-2 is a monolithic 8th order lowpass Butterworth filter, which provides a maximally flat passband. The attenuation slope is –48dB/octave and the maximum attenuation is in excess of 80db. An external TTL or CMOS clock programs the filter’s cutoff frequency. The clock to cutoff frequency ratio is 100:1 (Pin 10 at V–) or 50:1 (Pin 10 at V+). The maximum cutoff frequency is 140kHz. No external components are needed. The LTC1064-2 features low wideband noise and low harmonic distortion even for input voltages up to 3VRMS. In fact the LTC1064-2 overall performance competes with equivalent multiple op amp RC active realizations. The LTC1064-2 is available in a 14-pin DIP or 16-pin surface mounted SW package. The LTC1064-2 is fabricated using LTC’s enhanced analog CMOS Si-gate process. The LTC1064-2 is pin compatible with the LTC1064-1. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 8th Order Clock Sweepable Lowpass Butterworth Filter 1 NC 14 OUT C 2 LTC1064-2 13 VIN NC 3 AGND V– 12...