LTC1064-2 Low Noise, High Frequency, 8th Order Butterworth Lowpass Filter FEATURES DESCRIPTIO 8th Order Filter in a 14-Pin Package The LTC 1064-2 is a monolithic 8th order lowpass 140kHz Maximum Corner Frequency Butterworth filter, which provides a maximally flat pass- No External Components band. The attenuation slope is 48dB/octave and the 50:1 and 100:1 Clock to Cutoff Frequency Ratio maximum attenuation is in excess of 80db. An external 80V Total Wideband Noise TTL or CMOS clock programs the filters cutoff frequency. RMS 0.03% THD or Better The clock to cutoff frequency ratio is 100:1 (Pin 10 at + Operates from 2.37V to 8V Power Supplies V ) or 50:1 (Pin 10 at V ). The maximum cutoff frequency is 140kHz. No external components are needed. U The LTC1064-2 features low wideband noise and low APPLICATIO S harmonic distortion even for input voltages up to 3V . RMS Antialiasing Filters In fact the LTC1064-2 overall performance competes with Smoothing Filters equivalent multiple op amp RC active realizations. The Tracking High Frequency Lowpass Filters LTC1064-2 is available in a 14-pin DIP or 16-pin surface mounted SW package. The LTC1064-2 is fabricated using LTCs 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 Measured Frequency Response 0 1 14 OUT C V = 7.5V NC S LTC1064-2 15 2 13 NC V IN 30 3 12 V 8V AGND 4 45 11 + 8V f CLOCK = 5MHz V CLK 5 60 10 50/100 AGND 6 9 75 V NC OUT 7 8 90 NC R A IN 105 1064 TA01a 0 100 200 300 400 500 600 700 NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1F FREQUENCY (kHz) CAPACITOR CLOSE TO THE PACKAGE. THE NC PINS 1, 6, 8, 1064-2 TA01b AND 13 SHOULD BE PREFERABLY GROUNDED. 10642fa 1 V /V (dB) OUT IN U ULTC1064-2 ABSOLUTE AXI U RATI GS (Note 1) + Total Supply Voltage (V to V ) ............................ 16.5V Operating Temperature Range Power Dissipation.............................................. 400mW LTC1064-2M (OBSOLETE) ............... 55C to 125C Storage Temperature Range ................. 65C to 150C LTC1064-2C ....................................... 40C to 85C Lead Temperature (Soldering, 10 sec).................. 300C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART 1 OUT C NC 14 TOP VIEW NUMBER NUMBER 2 NC V 13 IN NC 1 OUT C 16 3 V AGND 12 LTC1064-2CN LTC1064-2CSW V 2 NC 15 IN + 4 f V 11 CLK AGND 3 14 V 5 50/100 + AGND 10 V 4 13 NC 6 V NC 9 OUT AGND 5 12 f CLK 7 NC R A 8 IN NC 6 11 50/100 NC 7 10 NC N PACKAGE 14-LEAD PDIP R A 8 9 V IN OUT T = 150C, = 110C/W JMAX JA J PACKAGE SW PACKAGE 14-LEAD CERDIP 16-LEAD PLASTIC (WIDE) SO LTC1064-2MJ LTC1064-2CJ T = 150C, = 130C/W JMAX JA OBSOLETE PACKAGE Consider the N14 Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 7.5V, 100:1, f = 2MHz, R1 = 10k, TTL clock input level unless A S CLK otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS Passband Gain (Note 2) Referenced to 0dB, 1Hz to 1kHz 0.5 0.15 dB Gain TempCo 0.0002 dB/C 3dB Frequency 100:1 20 kHz 50:1 40 kHz Gain at 3dB Frequency Referenced to 0dB, f = 20kHz 3 2.75 dB IN Stopband Attenuation At 1.5f , 50:1, f = 60kHz 24 27 dB 3dB IN Stopband Attenuation At 2f , 100:1, f = 40kHz 44 47 dB 3dB IN Stopband Attenuation At 3f , 100:1, f = 60kHz 74 dB 3dB IN Stopband Attenuation At 4f , 100:1, f = 80kHz 90 dB 3dB IN Input Frequency Range 100:1 0 <f /2 kHz CLK 50:1 0 <f kHz CLK Output Voltage Swing and V = 2.37V 1.1 V S Operating Input Voltage Range V = 5V 3.1 V S V = 7.5V 5.0 V S Total Harmonic Distortion V = 5V, Input = 1V at 1kHz 0.015 % S RMS = 7.5V, Input = 3V at 1kHz 0.03 % V S RMS Wideband Noise V = 5V, Input = GND 1Hz 1.99MHz 80 V S RMS V = 7.5V, Input = GND 1Hz 1.99MHz 90 V S RMS 10642fa 2 U WWW