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LTC1064-1CN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1064-1CN Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page LTC1064-1 1 10641fa APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO ■ 8th Order Filter in a 14-Pin Package ■ No External Components ■ 100:1 Clock to Center Ratio ■ 150µVRMS Total Wideband Noise ■ 0.03% THD or Better ■ 50kHz Maximum Corner Frequency ■ Operates from ±2.37V to ±8V Power Supplies ■ Passband Ripple Guaranteed Over Full Military Temperature Range Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter The LTC ®1064-1 is an 8th order, clock sweepable elliptic (Cauer) lowpass switched capacitor filter. The passband ripple is typically ±0.15dB, and the stopband attenuation at 1.5 times the cutoff frequency is 68dB or more. An external TTL or CMOS clock programs the value of the filter’s cutoff frequency. The clock to cutoff frequency ratio is 100:1. No external components are needed for cutoff frequencies up to 20kHz. For cutoff frequencies over 20kHz two low value capacitors are required to maintain passband flatness. The LTC1064-1 features low wideband noise and low harmonic distortion even for input voltages up to 3VRMS. In fact the LTC1064-1 overall performance completes with equivalent multiple op amp RC active realizations. The LTC1064-1 is available in a 14-pin DIP or 16-pin surface mounted SW package. The LTC1064-1 is pin compatible with the LTC1064-2. , LTC and LT are registered trademarks of Linear Technology Corporation. 8th Order Clock Sweepable Lowpass Elliptic Antialiasing Filter Frequency Response 15 0 –15 –30 –45 –60 –75 –90 –105 FREQUENCY (kHz) 040 1064 TA02 10 515 25 35 20 30 8th ORDER CLOCK SWEEPABLE LOWPASS ELLIPTIC ANTIALIASING FILTER MAINTAINS, FOR 0.1Hz ≤ fCUTOFF ≤ 10kHz, A ±0.15dB PASSBAND RIPPLE AND 72dB STOPBAND ATTENUATION AT 1.5 × fCUTOFF. TOTAL WIDEBAND NOISE = 150µVRMS, THD = 0.03% FOR VIN = 1VRMS LTC1064-1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 R(h, I) COMP2* V– fCLK NC VOUT NC INV C VIN AGND V+ AGND COMP1* INV A 1064 TA01 NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR CLOSE TO THE PACKAGE. FOR SERVO OFFSET NULLING APPLICATIONS, PIN 1 IS THE 2ND STAGE SUMMING JUNCTION. *FOR CUTOFF FREQUENCY ABOVE 20kHz, USE COMPENSATION CAPACITORS (5pF TO 56pF) BETWEEN PIN 13 AND PIN 1 AND PIN 6 AND PIN 7. CLOCK (TTL, ≤5MHz) –8V 8V VOUT VIN 0.1µF 0.1µF ■ Antialiasing Filters ■ Telecom PCM Filters |
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