LTC1064-3 Low Noise, High Frequency, 8th Order Linear Phase Lowpass Filter U FEATURES DESCRIPTIO 8th Order Filter in a 14-Pin Package 95kHz Maximum Corner Frequency No External Components 75:1, 150:1 and 120:1 Clock to Cutoff Frequency Ratio 60VRMS Total Wideband Noise 0.03% THD or Better Operates from 2.37V to 8V Power Supplies Low Total Output DC Offset U APPLICATIO S Antialiasing Filters Smoothing Filters Tracking High Frequency Lowpass Filters The LTC(R)1064-3 is a monolithic 8th order lowpass Bessel filter, which provides a linear phase response over its entire passband. An external TTL or CMOS clock programs the filter's cutoff frequency. The clock to cutoff frequency ratio is 75:1 (Pin 10 at V+) or 150:1 (Pin 10 at V-) or 120:1 (Pin 10 at GND). The maximum cutoff frequency is 95kHz. No external components are needed. The LTC1064-3 features low wideband noise and low harmonic distortion even for input voltages up to 3VRMS. In fact the LTC1064-3 overall performance competes with equivalent multiple op amp RC active realizations. The LTC1064-3 is available in a 14-pin DIP or 16-pin surface mounted SOL package. The LTC1064-3 is fabricated using LTC's enhanced analog CMOS Si-gate process. The LTC1064-3 is pin compatible with the LTC1064-1, LTC1064-2 and LTC1064-4. , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO 8th Order Clock Sweepable Lowpass Bessel Filter VIN 2 3 4 8V 0.1F 5 6 7 NC OUT C VIN NC 14 13 -15 LTC1064-3 12 V- AGND V+ AGND NC INV A fCLK 75/150 VOUT NC 11 -8V CLOCK = 7MHz 0.1F 10 + V 9 VOUT 8 1064 TA01a NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1F OR LARGER CAPACITOR CLOSE TO THE PACKAGE. THE CONNECTI0N BETWEEN PIN 7 AND PIN 14 SHOULD BE MADE UNDER THE IC PACKAGE. -30 VOUT/VIN (dB) 1 Measured Frequency Response 0 -45 -60 -75 -90 VS = 7.5V, fCLK = 7MHz, PIN 10 TO V +, f -3dB = 95kHz, GROUP DELAY = 6s -105 100 10 1000 FREQUENCY (kHz) 1064-3 TA01b 10643fa 1 LTC1064-3 W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (V + to V -) ............................ 16.5V Power Dissipation .............................................. 400mW Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C Operating Temperature Range LTC1064-3M (OBSOLETE) ............... - 55C to 125C LTC1064-3C ....................................... - 40C to 85C Input Voltage ........................... (V+ +0.3V) to V - -0.3V) Burn-In Voltage ....................................................... 15V U U W PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW NC 1 14 OUT C VIN 2 13 NC 3 V- AGND 12 V+ 4 11 fCLK AGND 5 10 75/150 NC RIN A 6 9 7 8 LTC1064-3CN VOUT NC N PACKAGE 14-LEAD PDIP TJMAX = 110C, JA = 70C/W J PACKAGE 14-LEAD CERDIP LTC1064-3MJ LTC1064-3CJ OBSOLETE PACKAGE ORDER PART NUMBER TOP VIEW NC 1 16 OUT C VIN 2 15 NC AGND 3 14 V - V+ 4 13 NC AGND 5 12 fCLK NC 6 11 75/150 NC 7 10 NC RIN A 8 9 LTC1064-3CSW VOUT SW PACKAGE 16-LEAD PLASTIC (WIDE) SO TJMAX = 150C, JA = 90C/W Consider the N 14 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 TA = 25C. VS = 7.5V, 75:1, fCLK = 2MHz, R1 = 10k, TTL or CMOS clock input level unless otherwise specified. PARAMETER CONDITIONS Passband Gain Gain TempCo -3dB Frequency Referenced to 0dB, 1Hz to 1kHz Gain at -3dB Frequency Stopband Attenuation Stopband Attenuation Stopband Attenuation 50:1 (fCLK /f -3dB = 75) 100:1 (fCLK /f -3dB = 150) Referenced to 0dB, fIN = 26.67/13.34kHz At 3f -3dB At 5f -3dB At 7f -3dB Input Frequency Range 100:1 50:1 Output Voltage Swing and Operating Input Voltage Range VS = 2.37V VS = 5V VS = 7.5V Total Harmonic Distortion VS = 5V, Input = 1VRMS at 1kHz VS = 7.5V, Input = 3VRMS at 1kHz Wideband Noise VS = 5V, Input = GND 1Hz - 1.99MHz VS = 7.5V, Input = GND 1Hz - 1.99MHz MIN TYP -0.5 MAX UNITS 0.15 dB dB/C kHz kHz dB dB dB dB 0.0002 26.67 13.34 -3.8 -25 -56 -2.75 -29 -60 -84 0 0 <fCLK/2 <fCLK kHz kHz V V V 1.1 3.1 5 0.015 0.03 55 60 % % VRMS VRMS 10643fa 2 LTC1064-3 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 7.5V, 75:1, fCLK = 2MHz, R1 = 10k, TTL or CMOS clock input level unless otherwise specified. PARAMETER CONDITIONS Output DC Offset Output DC Offset TempCo VS = 7.5V VS = 5V VS = 7.5V MIN Input Impedance TYP MAX UNITS 30 20 50 150 mV V/C V/C 14 22 k Output Impedance f OUT = 10kHz 2 Output Short-Circuit Current Source/Sink 3/1 mA 200 VRMS Clock Feedthrough Maximum Clock Frequency VS 7V, 50% Duty Cycle VS 7V, 50% Duty Cycle, TA = <55C Power Supply Current VS = 2.37V, f CLK = 1MHz VS = 5V, f CLK = 1MHz 10 12 VS = 7.5V, f CLK = 1MHz 16 Power Supply Voltage Range 2.37 5 7 MHz MHz 22 23 26 28 32 mA mA mA mA mA 8 V Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. U W TYPICAL PERFOR A CE CHARACTERISTICS Gain vs Frequency Phase vs Frequency -60 180 225 270 315 -75 -90 135 VS = 7.5V TA = 25C -105 10k 1M 1064 G01 90 80 70 60 fCLK = 750kHz, f-3dB = 10kHz 50 40 30 360 20 405 10 450 100k FREQUENCY (Hz) VS = 7.5V TA = 25C 100 GROUP DELAY (s) 90 fCLK = 5MHz f -3dB = 66.67kHz -45 VS = 7.5V TA = 25C f CLK = 750kHz f-3dB = 10kHz 45 fCLK = 2MHz f -3dB = 26.67kHz PHASE (DEG) GAIN (dB) -30 110 0 fCLK = 7MHz f -3dB = 95kHz 0 -15 Group Delay -45 15 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY (kHz) 1064 G02 0 fCLK = 2MHz, f-3dB = 26.67kHz fCLK = 5MHz, f-3dB = 66.67kHz 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY (kHz) 1064 G03 10643fa 3 LTC1064-3 U W TYPICAL PERFOR A CE CHARACTERISTICS 1.0 2.2 VS = 7.5V 2.0 fCLK = 1.5MHz 1.8 f -3dB = 20kHz 50 UNIT SAMPLE (TA = 25C TO 125C) 1.6 DISTORTION (%) PHASE MATCH (DEG) Power Supply Current vs Power Supply Voltage Total Harmonic Distortion 1.4 1.2 1.0 0.8 48 fCLK = 1.5MHz, 75:1 f -3dB = 20kHz 44 POWER SUPPLY CURRENT (mA) Phase Matching VS = 5V 0.1 VS = 2.37V 0.6 0.4 VS = 7.5V 0.2 0 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY (kHz) 0.01 0.1 1 INPUT LEVELS (VRMS) 40 36 32 28 24 TA = -55C 20 TA = 25C 16 TA = 125C 12 8 4 0 10 1064 G05 1064 G04 fCLK = 1MHz 0 2 4 6 8 10 12 14 16 18 20 22 24 TOTAL POWER SUPPLY VOLTAGE (V) 1064 G06 Transient Response Input 10VP-P Square Wave VS = 7.5V, Pin 10 to V +, f CLK = 1.5MHz Table 1. Wideband Noise (VRMS) Pin 10 to fCLK /f -3dB VS = 2.37V VS = 5V VS = 7.5V Noise VRMS Noise VRMS Noise VRMS V+ 75/1 50 55 60 V- 150/1 52 58 62 GND 120/1 45 50 54 10643fa 4 LTC1064-3 U W TYPICAL PERFOR A CE CHARACTERISTICS Table 2. Gain/Phase, f -3dB = 1kHz, LTC1064-3 Typical Response VS = 5V, TA = 25C, fCLK = 75kHz, Pin 10 at V + (fltr 75:1) PHASE (deg) Table 3. Gain/Delay, f -3dB = 1kHz, LTC1064-3 Typical Response VS = 5V, TA = 25C, fCLK = 75kHz, Pin 10 at V + (fltr 75:1) FREQUENCY (kHz) GAIN (dB) FREQUENCY (kHz) GAIN (dB) DELAY (ms) 0.500 - 0.858 -90.430 0.200 - 0.281 0.502 1.000 - 2.990 179.200 0.300 - 0.420 0.503 1.500 - 6.840 89.600 0.400 - 0.610 0.503 2.000 - 12.780 3.800 0.500 - 0.860 0.502 2.500 - 20.800 -71.000 0.600 - 1.160 0.502 3.000 - 29.900 -129.600 0.700 - 1.530 0.502 3.500 - 38.800 -173.700 0.800 - 1.950 0.503 4.000 - 47.100 152.600 0.900 - 2.430 0.503 4.500 - 54.700 126.000 1.000 - 2.990 0.500 5.000 - 61.600 103.300 1.100 - 3.610 0.500 5.500 - 68.000 85.190 1.200 - 4.300 0.500 6.000 - 73.840 69.060 1.300 - 5.060 0.498 6.500 - 79.250 54.780 1.400 - 5.920 0.495 7.000 - 84.230 42.440 1.500 - 6.830 0.491 7.500 - 88.940 30.060 1.600 - 7.840 0.489 8.000 - 93.360 21.300 1.700 - 8.930 0.481 8.500 - 97.510 10.000 1.800 - 10.130 0.473 9.000 -100.880 1.520 1.900 - 11.410 0.465 9.500 -105.780 -7.820 2.000 - 12.780 0.454 Table 4. Gain/Phase, f -3dB = 1kHz, LTC1064-3 Typical Response VS = 5V, TA = 25C, fCLK = 150kHz, Pin 10 at V - (fltr 150:1) Table 5. Gain/Delay, f-3dB = 1kHz, LTC1064-3 Typical Response VS = 5V, TA = 25C, fCLK = 150kHz, Pin 10 at V- (fltr 150:1) FREQUENCY (kHz) GAIN (dB) PHASE (deg) FREQUENCY GAIN (dB) DELAY (ms) 0.500 - 0.955 - 88.100 0.200 - 0.284 0.490 1.000 - 3.380 -175.300 0.300 - 0.450 0.489 1.500 - 7.570 99.700 0.400 - 0.670 0.489 2.000 - 13.770 20.100 0.500 - 0.960 0.487 2.500 - 21.800 - 48.000 0.600 - 1.310 0.487 3.000 - 30.700 -100.700 0.700 - 1.730 0.485 3.500 - 39.400 -139.900 0.800 -2.210 0.484 4.000 - 47.600 -169.200 0.900 -2.750 0.482 4.500 - 55.100 168.300 1.000 -3.380 0.478 5.000 - 61.900 150.300 1.100 - 4.070 0.478 5.500 - 68.260 135.830 1.200 - 4.820 0.475 6.000 - 74.050 123.660 1.300 - 5.660 0.470 6.500 - 79.450 113.440 1.400 - 6.580 0.467 7.000 - 84.330 104.440 1.500 - 7.570 0.463 7.500 - 89.010 97.670 1.600 - 8.640 0.456 8.000 - 93.250 91.580 1.700 - 9.790 0.448 8.500 - 97.340 84.670 1.800 - 11.050 0.438 9.000 - 101.390 74.600 1.900 - 12.360 0.428 9.500 - 104.980 75.990 2.000 - 13.770 0.417 10643fa 5 LTC1064-3 U W TYPICAL PERFOR A CE CHARACTERISTICS Table 6. Gain/Phase, f -3dB = 1kHz, LTC1064-3 Typical Response VS = 5V, TA = 25C, fCLK = 120kHz, Pin 10 at GND (fltr 120:1) Table 7. Gain/Delay, f-3dB = 1kHz, LTC1064-3 Typical Response VS = 5V, TA = 25C, fCLK = 120kHz, Pin 10 at GND (fltr 120:1) FREQUENCY (kHz) GAIN (dB) PHASE (deg) FREQUENCY (kHz) GAIN (dB) DELAY (ms) 0.500 -0.994d -82.210 0.200 -0.354 0.458 1.000 -3.050 -162.800 0.300 -0.520 0.456 1.500 -6.520 116.700 0.400 -0.730 0.454 2.000 -12.180 40.200 0.500 -1.000 0.452 2.500 -19.460 -23.600 0.600 -1.320 0.449 3.000 -27.200 -74.000 0.700 -1.670 0.448 3.500 -34.700 -114.200 0.800 -2.090 0.446 4.000 -41.900 -146.800 0.900 -2.540 0.446 4.500 -48.700 -173.300 1.000 -3.050 0.445 5.000 -55.100 164.700 1.100 -3.600 0.446 5.500 -60.900 145.800 1.200 -4.220 0.449 6.000 -66.500 130.610 1.300 -4.900 0.448 6.500 -71.660 117.130 1.400 -5.670 0.447 7.000 -76.390 105.880 1.500 -6.520 0.446 7.500 -80.910 96.140 1.600 -7.470 0.441 8.000 -84.900 87.510 1.700 -8.500 0.432 8.500 -88.750 81.380 1.800 -9.650 0.422 9.000 -92.410 78.190 1.900 -10.870 0.409 9.500 -98.290 52.860 2.000 -12.180 0.395 Table 8. Gain/Phase, f-3dB = 20kHz, LTC1064-3 Typical Response VS = 7.5V, fCLK = 1.5MHz, Pin 10 at V+(fltr 75:1) TA = 25C FREQUENCY (kHz) GAIN (dB) 10.000 -0.912 20.000 30.000 40.000 -12.710 TA = 125C PHASE (deg) FREQUENCY (kHz) GAIN (dB) PHASE (deg) -92.270 10.000 -0.944 -92.880 -3.090 176.000 20.000 -3.170 175.500 -6.910 85.500 30.000 -6.910 85.700 -1.200 40.000 -12.450 -0.600 50.000 -20.500 -77.800 50.000 -19.920 -78.000 60.000 -29.400 -138.700 60.000 -28.500 -140.700 70.000 -38.300 174.600 70.000 -37.200 170.500 80.000 -46.500 138.300 80.000 -45.300 132.200 90.000 -54.000 109.100 90.000 -52.700 100.900 100.000 -61.000 84.800 100.000 -59.600 74.900 110.000 -67.310 64.040 110.000 -65.900 52.600 120.000 -73.170 46.260 120.000 -71.750 32.850 130.000 -78.600 31.120 130.000 -77.170 15.840 140.000 -83.760 18.050 140.000 -82.370 1.130 150.000 -88.630 7.770 150.000 -87.400 -11.380 10643fa 6 LTC1064-3 U U U PI FU CTIO S (Pin Numbers Refer to the 14-Pin Package) NC (Pins 1, 6, 8 and 13): The "no connection" pins should be preferably grounded. These pins are not internally connected. VIN, VOUT (Pins 2, 9): The input Pin 2 is connected to an 18k resistor tied to the inverting input of an op amp. Pin 2 is protected against static discharge. The device's output, Pin 9, is the output of an op amp which can typically source/sink 3mA/1mA. Although the internal op amps are unity gain stable, driving long coax cables is not recommended. When testing the device for noise and distortion, the output, Pin 9, should be buffered (Figure 1). The op amp power supply wire (or trace) should be connected directly to the power source. To eliminate switching transients from filter output, buffer filter output with a third order lowpass (see Figure 5). AGND (Pins 3, 5): For dual supply operation these pins should be connected to a ground plane. For single supply operation both pins should be tied to one half supply (Figure 3). V +, V - (Pins 4, 12): Should be bypassed with a 0.1F capacitor to an adequate analog ground. Low noise, nonswitching power supplies are recommended. To avoid latchup when the power supplies exhibit high turn-on transients, a 1N5817 Schottky diode should be added from the V + and V - pins to ground (Figure 1, 2 and 3). RIN A, OUT C (Pins 7, 14): A very short connection between Pin 7 and Pin 14 is recommended. This connection should be preferably done under the IC package. In a breadboard, use a one inch, or less, shielded coaxial cable: the shield should be grounded. In a PC board, use a one inch trace or less; surround the trace by a ground plane. 50/100 (Pin 10): Ratio Pin.The DC level at this pin determines the ratio of clock frequency to the -3dB frequency of the filter. The ratio is 75:1 when Pin 10 is at V +, 120:1 when Pin 10 is at GND and 150:1 when Pin 10 is at V -. This pin should be bypassed with a 0.1F capacitor to analog ground when it's connected to V - or V + (Figure 1). See Tables 2 through 8 for typical gain and delay responses for the three ratios. fCLK (Pin 11): For 5V supplies the logic threshold level is 1.4V. For 8V and 0V to 5V supplies the logic threshold levels are 2.2V and 3V respectively. The logic threshold levels vary 100mV over the full military temperature range. The recommended duty cycle of the input clock is 50% although for clock frequencies below 500kHz the clock "on" time can be as low as 200ns. The maximum clock frequency for 5V supplies is 4MHz. For 7V supplies and above, the maximum clock frequency is 7MHz. Do not allow the clock levels to exceed the power supplies. For single supply operation 6V use level shifting at Pin 11 with T2L levels (see Figure 4). 10643fa 7 LTC1064-3 U TYPICAL APPLICATIO S 1 POWER SOURCE V+ V- OUT C 14 NC 1 2 13 NC VIN LTC1064-3 3 12 V- AGND VIN 4 0.1F 5 6 V+ fCLK 75/150 AGND VOUT NC 7 INV A NC 2 VIN 0.1F 11 10 V+ 0.1F 10k 9 10k 8 0.1F NC 13 4 V+ fCLK 75/150 AGND VOUT NC 7 VOUT VIN 14 LTC1064-3 12 V- AGND 6 - OUT C 3 5 0.1F 1N5817 V +/V - NC NC INV A V- 11 0.1F 1N5817 10 9 VOUT 8 + 1064-3 F02 1064-3 F01 RECOMMENDED OP AMPS: LT1022, LT318, LT1056 0.1F Figure 2. Using Schottky Diodes to Protect the IC from Power Supply Reversal Figure 1. Buffering the Filter Output. The Buffer Op Amp Should Not Share the LTC1064-3 Power Lines 1 2 VIN V+= 15V 0.1F 0.1F NC 13 4 V+ 7 5k VIN fCLK AGND 75/150 NC VOUT INV A NC 1 14 LTC1064-3 12 AGND V- 6 V+/2 OUT C 3 5 5k NC 11 fCLK V+ 0V TO 10V 10 9 2 VIN 8 0.1F NC 13 4 V+ 7 5k VIN 14 LTC1064-3 12 AGND V- 6 VOUT OUT C 3 5 5k NC fCLK AGND 75/150 NC VOUT INV A NC V+ 2.2k T2L LEVEL 11 10 9 RATIO 5k 1F VOUT 8 1064-3 F04 1064-3 F03 Figure 4. Level Shifting the Input T2L Clock for Single Supply Operation 6V Figure 3. Single Supply Operation. If Fast Power Up or Down Transients are Expected, Use a 1N5817 Schottky Diode Between Pin 4 and Pin 5 1 VIN V+ 0.1F 2 NC OUT C 14 13 NC LTC1064-3 3 12 AGND V- 4 5 6 7 VIN V+ AGND NC INV A fCLK 75/150 VOUT NC V- 10k 0.1F 11 VOUT 200pF 10 9 8 V+/GND/V - 4.99k 4.99k - 50 LT1056 430pF + 0.027F 1064-3 F05 Figure 5. Adding an Output Buffer-Filter to Eliminate Any Clock Feedthrough. Passband 0.1dB to 50kHz, -3dB at 94kHz 10643fa 8 LTC1064-3 U PACKAGE DESCRIPTIO J Package 14-Lead CERDIP (Narrow 0.300, Hermetic) (LTC DWG # 05-08-1110) .005 (0.127) MIN .785 (19.939) MAX 14 13 12 11 10 9 8 .220 - .310 (5.588 - 7.874) .025 (0.635) RAD TYP 1 2 3 4 5 6 7 .300 BSC (7.62 BSC) .200 (5.080) MAX .015 - .060 (0.381 - 1.524) .008 - .018 (0.203 - 0.457) 0 - 15 .045 - .065 (1.143 - 1.651) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 - .026 (0.360 - 0.660) .100 (2.54) BSC .125 (3.175) MIN J14 0801 OBSOLETE PACKAGE 10643fa 9 LTC1064-3 U PACKAGE DESCRIPTIO N Package 14-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) .770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 .255 .015* (6.477 0.381) .300 - .325 (7.620 - 8.255) .045 - .065 (1.143 - 1.651) .130 .005 (3.302 0.127) .020 (0.508) MIN .065 (1.651) TYP .008 - .015 (0.203 - 0.381) +.035 .325 -.015 ( +0.889 8.255 -0.381 NOTE: 1. DIMENSIONS ARE ) .120 (3.048) MIN .005 (0.125) .100 MIN (2.54) BSC INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) .018 .003 (0.457 0.076) N14 1002 10643fa 10 LTC1064-3 U PACKAGE DESCRIPTIO SW Package 16-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .050 BSC .045 .005 .030 .005 TYP .398 - .413 (10.109 - 10.490) NOTE 4 16 N 15 14 13 12 11 10 9 N .325 .005 .420 MIN .394 - .419 (10.007 - 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .005 (0.127) RAD MIN .009 - .013 (0.229 - 0.330) .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737) 3 4 5 6 7 .093 - .104 (2.362 - 2.642) 8 .037 - .045 (0.940 - 1.143) 0 - 8 TYP NOTE 3 .016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN 2 .050 (1.270) BSC .004 - .012 (0.102 - 0.305) .014 - .019 (0.356 - 0.482) TYP INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) S16 (WIDE) 0502 10643fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LTC1064-3 U TYPICAL APPLICATIO S 1 2 NC OUT C 14 VOUT1: f-3dB = 13 NC LTC1064-3 3 12 AGND V- VIN1 4 7.5V 0.1F 5 6 7 VIN2 Amplitude Response fCLK 55 VIN V+ AGND NC fCLK 75/150 VOUT INV A NC 11 -7.5V fCLK = 1MHz 0.1F 10 9 fCLK VOUT2: f-3dB = 110 8 1064-3 F06 Figure 6. Dual 4th Order Bessel Filters. VS = 7.5V, f CLK = 1MHz, Pin 10 to GND. f -3dB = 9kHz and 18kHz RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1069-7 8th Order Linear Phase Lowpass S0-8 Package LTC1563 Active RC, 4th Order Bessel Lowpass Continuous Time, Resistor Programmable Cutoff LTC1569-6 DC Accurate, 10th Order Lowpass Linear Phase, Internal Precision Clock, S0-8 Package LTC1569-7 DC Accurate, 10th Order Lowpass Linear Phase, Internal Precision Clock, S0-8 Package 10643fa 12 Linear Technology Corporation LW/TP 1202 1K REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 1989