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LTC1064-4CSW

製品説明
仕様・特性

LTC1064-4 Low Noise, 8th Order, Clock Sweepable Cauer Lowpass Filter U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 8th Order Filter in a 14-Pin Package 80dB or More Stopband Attenuation at 2 × fCUTOFF 50:1, fCLK to fCUTOFF Ratio (Cauer) 100:1, fCLK to f–3dB Ratio (Transitional) 135µVRMS Total Wideband Noise 0.03% THD or Better 100kHz Maximum fCUTOFF Frequency Operates up to ±8V Power Supplies Input Frequency Range up to 50 Times the Filter Cutoff Frequency U APPLICATIO S ■ ■ ■ Antialiasing Filters Telecom Filters Sinewave Generators The LTC®1064-4 is an 8th order, clock sweepable Cauer lowpass switched capacitor filter. An external TTL or CMOS clock programs the value of the filter’s cutoff frequency. With Pin 10 at V +, the fCLK to fCUTOFF ratio is 50:1; the filter has a Cauer response and with compensation the passband ripple is ±0.1dB. The stopband attenuation is 80dB at 2 × fCUTOFF. Cutoff frequencies up to 100kHz can be achieved. With Pin 10 at V –, the fCLK to f –3dB ratio is 100:1, the filter has a transitional ButterworthCauer response with lower noise and lower delay nonlinearity than the Cauer response. The stopband attenuation at 2.5 × f –3dB is 92dB. Cutoff frequencies up to 50kHz can be achieved. The LTC1064-4 features low noise and low harmonic distortion even when input voltages up to 3VRMS are applied. The LTC1064-4 overall performance competes with equivalent multiple op amp active realizations. The LTC1064-4 is pin compatible with the LTC1064-1, LTC1064-2 and LTC1064-3. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. The LTC1064-4 is manufactured using Linear Technology’s enhanced LTCMOSTM silicon gate process. U TYPICAL APPLICATIO 8th Order Clock Sweepable Lowpass Elliptic Filter VIN 2 R(h, I) INV C VIN COMP2* 14 13 0 3 8V 0.1µF 12 V– AGND 4 + LTC1064-4 11 CLOCK fCLK V (TTL, ≤5MHz) 5 10 + – 50/100 AGND V /V 6 7 COMP1* INV A VOUT NC 9 –8V 0.1µF VOUT/VIN (dB) 1 Frequency Response 20 TA = 25°C fCLK = 5MHz, 50:1 CCOMP1 = 30pF, CCOMP2 = 18pF –20 –40 –60 fCLK = 2MHz, 50:1 VOUT –80 8 –100 1064 TA01 * FOR FREQUENCIES ABOVE 20kHz AND MINIMUM PASSBAND RIPPLE REFER TO THE PIN DESCRIPTION SECTION FOR COMPENSATION GUIDELINES. NOTE:THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR CLOSE TO THE PACKAGE. BYPASSING PIN 10 WITH 0.1µF CAPACITOR REDUCES CLOCK FEEDTHROUGH. THE CONNECTION BETWEEN PINS 7 AND 14 SHOULD BE PHYSICALLY DONE UNDER THE PACKAGE. fCLK = 1MHz, 100:1 1k 10k 100k FREQUENCY (Hz) 1M 1064-4 TA01b 10644fb 1

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