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 LTC1064-4 W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (V + to V –) ............................ 16.5V Input Voltage at Any Pin ...... V – –0.3V ≤ VIN ≤ V + +0.3V Power Dissipation .............................................. 400mW Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C Operating Temperature Range LTC1064-4M (OBSOLETE) ............... – 55°C to 125°C LTC1064-4C ....................................... – 40°C to 85°C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART NUMBER INV C 1 14 R(h, I) VIN 2 13 COMP2 AGND 3 – 12 V V+ 4 11 fCLK AGND 5 10 RATIO COMP1 6 9 VOUT INV A 7 8 NC INV C 1 LTC1064-4CN VIN 2 AGND 3 V+ 4 AGND 5 NC 6 COMP1 7 N PACKAGE 14-LEAD PDIP TJMAX = 110°C, θJA = 70°C/W INV A 8 J PACKAGE 14-LEAD CERDIP LTC1064-4MJ LTC1064-4CJ OBSOLETE PACKAGE ORDER PART NUMBER TOP VIEW 16 R(h, I) 15 COMP2 14 LTC1064-4CSW V– 13 NC 12 fCLK 11 RATIO 10 NC 9 VOUT SW PACKAGE 16-LEAD PLASTIC (WIDE) SO TJMAX = 150°C, θJA = 90°C/W 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 TA = 25°C. VS = ±7.5V, 50:1, f CLK = 1MHz, f C = 20kHz, R1 = 10k, TTL clock input level unless otherwise specified. PARAMETER CONDITIONS Passband Gain Gain TempCo Passband Edge Frequency, fC Gain at f C –3dB Frequency Referenced to 0dB, 1Hz to 0.05fCUTOFF Passband Ripple (Note 2) Stopband Attenuation Stopband Attenuation MIN ● TYP –0.5 MAX UNITS 0.1 dB dB/°C kHz dB kHz kHz dB dB dB 0.0002 20 ± 1% Referenced to Passband Gain, f C = 20kHz 50:1 (Cauer Response) 100:1 (Transitional Response) 0.1fC to 0.95fC Referenced to Passband Gain At 1.7f CUTOFF At 2f CUTOFF Input Frequency Range 50:1, Pin 10 at V + 100:1, Pin 10 at V – 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 to 999kHz VS = ±7.5V, Input = GND 1Hz to 999kHz ● –0.4 0.7 21.5 10 ● ● –0.15 –56 0.6 –60 –80 0 0 ● ● ● fCLK fCLK/2 kHz kHz V V V ±1.1 ±3.1 ±5.0 0.015 0.03 120 135 % % µVRMS µVRMS 10644fb 2 LTC1064-4 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±7.5V, 50:1, f CLK = 1MHz, f C = 20kHz, R1 = 10k, TTL 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 9 TYP MAX UNITS ± 50 –100 –200 ±160 mV µV/°C µV/°C 13 kΩ Output Impedance f OUT = 10kHz 2 Ω Output Short-Circuit Current Source/Sink 3/1 mA Clock Feedthrough Input = GND 200 µVRMS Maximum Clock Frequency VS = ±7.5V, 50% Duty Cycle (Note 3) Power Supply Current VS = ±2.37V, f CLK = 1MHz VS = ±5V, f CLK = 1MHz 11 14 ● ● VS = ±7.5V, f CLK = 1MHz 17 ● Power Supply Voltage Range ● Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. ±2.37 5 MHz 22 23 26 28 32 mA mA mA mA mA ±8 V Note 2: For tighter passband ripple specifications please consult with LTC’s marketing. Note 3: Not tested, guaranteed by design. U W TYPICAL PERFOR A CE CHARACTERISTICS Passband Phase Shift vs Frequency Gain vs Frequency VS = ±7.5V TA = 25°C fCLK = 2MHz, 50:1 45 PHASE SHIFT (DEG) GAIN (dB) –45 –60 –75 –90 –105 10k VS = ±7.5V TA = 25°C fC = 20kHz f CLK = 1MHz, 50:1 0 –15 –30 220 90 135 180 225 270 100k FREQUENCY (Hz) 1M 1064-4 G01 180 160 140 120 100 80 315 60 360 40 405 20 450 0 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY (kHz) 1064-4 G02 VS = ±7.5V TA = 25°C fC = 20kHz f CLK = 1MHz, 50:1 200 GROUP DELAY (µs) 0 Passband Group Delay –45 15 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY (kHz) 1064-4 G03 10644fb 3 LTC1064-4 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain vs Frequency with Compensation Device to Device Phase Matching TA = 125°C TA = 25°C 4.5 PHASE MATCH (±DEG) GAIN (dB) –5 –10 –15 –25 –30 VS = ±7.5V fCLK = 5MHz RATIO = 50:1 4.0 3.5 3.0 2.5 2.0 fCLK = 1MHz, 50:1 f CUTOFF = 20kHz VS = ±5V 0.1 VS = ±7.5V 0.5 1M 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY (kHz) 1064-4 G04 10 Transient Response fCLK = 1MHz, Ratio = 50:1, fC = 20kHz, VS = ±7.5V, 1kHz Square Wave Input fCLK = 1MHz 40 36 32 28 24 TA = –55°C 20 TA = 25°C 16 TA = 125°C 2V/DIV POWER SUPPLY CURRENT (mA) 44 1 INPUT LEVEL (VRMS) 1064-4 G06 1064-4 G05 Power Supply Current vs Power Supply Voltage 48 0.01 0.1 0 100k FREQUENCY (Hz) VS = ±2.37V 1.5 1.0 FOR COMPENSATION INFORMATION SEE PIN DESCRIPTION SECTION –35 10k VS = ±7.5V fC = 20kHz f CLK = 1MHz, 50:1 50 UNIT SAMPLE (TA = 25°C TO 125°C) 5.0 DISTORTION (%) 0 –20 Total Harmonic Distortion 1.0 5.5 5 12 8 4 0 0.1ms/DIV 0 2 4 6 8 10 12 14 16 18 20 22 24 TOTAL POWER SUPPLY VOLTAGE (V) 1064-4 G07 Table 1. Wideband Noise (µVRMS). Input Grounded, fCLK = 1MHz VS = ±2.37V VS = ±5V VS = ±7.5V fCLK /f CUTOFF Noise µVRMS Noise µVRMS Noise µVRMS V+ 50:1 120 135 145 V– 100:1 100 120 130 Pin 10 to 10644fb 4 LTC1064-4 U W TYPICAL PERFOR A CE CHARACTERISTICS Table 2. Gain/Phase, Pin 10 at V +, Typical Response f CUTOFF = 1kHz, VS = ±5V, TA = 25°C, fCLK = 50kHz, Ratio = 50:1 FREQUENCY(kHz) GAIN (dB) PHASE (deg) 0.200 – 0.075 –59.990 0.400 – 0.050 –122.400 0.600 0.020 169.300 0.800 0.060 88.500 1.000 0.090 –26.100 1.200 – 15.640 –175.100 1.400 – 34.700 126.500 1.600 – 51.700 87.600 1.800 – 68.600 38.400 2.000 – 84.110 –47.860 Table 3. Gain/Delay, Pin 10 at V +, Typical Response f CUTOFF = 1kHz, VS = ±5V, TA = 25°C, fCLK = 50kHz, Ratio = 50:1 Table 4. Gain/Phase, Pin 10 at V –, Typical Response f –3dB = 1kHz, VS = ±5V, TA = 25°C, fCLK = 100kHz, Ratio = 100:1 FREQUENCY(kHz) GAIN (dB) DELAY (ms) FREQUENCY(kHz) GAIN (dB) PHASE (deg) 0.200 – 0.074 0.844 0.200 – 0.179 –60.090 0.300 – 0.070 0.867 0.400 – 0.440 –122.000 0.400 – 0.050 0.899 0.600 – 0.810 170.800 0.500 – 0.020 0.949 0.800 – 1.480 91.900 0.600 0.020 1.021 1.000 – 3.500 –16.300 0.700 0.050 1.122 1.200 – 17.720 –140.500 0.800 0.060 1.275 1.400 – 35.700 164.800 0.900 0.120 1.592 1.600 – 52.700 135.000 1.000 0.090 2.160 1.800 – 71.900 114.000 1.100 – 5.020 2.070 2.000 – 96.160 –49.670 1.200 – 15.650 1.288 Table 5. Gain/Delay, Pin 10 at V –, Typical Response f –3dB = 1kHz, VS = ±5V, TA = 25°C, fCLK = 100kHz, Ratio = 100:1 FREQUENCY(kHz) GAIN (dB) DELAY (ms) 0.200 – 0.174 0.842 0.300 – 0.300 0.861 0.400 – 0.440 0.500 – 0.610 0.600 0.700 Table 6. Gain/Phase, Pin 10 at GND VS = ±5V, TA = 25°C FREQUENCY(kHz) GAIN (dB) PHASE (deg) 0.200 – 0.383 –47.140 0.400 – 1.000 –92.000 0.888 0.600 – 1.300 –134.300 0.933 0.800 – 0.280 –178.800 – 0.810 0.999 1.000 2.670 109.200 – 1.090 1.095 1.200 – 3.500 6.000 0.800 – 1.480 1.242 1.400k – 12.510 –47.400 0.900 – 2.080 1.503 1.600 – 20.000 –88.800 1.000 – 3.500 1.832 1.800 – 27.300 –127.800 1.100 – 8.720 1.724 2.000 – 35.000 –164.200 1.200 – 17.720 1.183 10644fb 5 LTC1064-4 U W TYPICAL PERFOR A CE CHARACTERISTICS Table 7. Gain/Phase for Figure 6. Typical Response, Pin 10 at V+, f CUTOFF = 40kHz, VS = ±7.5V, fCLK = 2MHz, Ratio = 50:1 Table 8. Gain/Phase for Figure 7. Typical Response, Pin 10 at V+, f CUTOFF = 100kHz, VS = ±7.5V, TA = 25°C, fCLK = 5MHz, Ratio = 50:1 FREQUENCY (kHz) GAIN (dB) PHASE (deg) FREQUENCY (kHz) GAIN (dB) PHASE (deg) 10.000 –0.094 –75.900 10.000 –0.096 –32.390 12.000 –0.100 –91.400 20.000 –0.100 –64.900 14.000 –0.090 –107.200 30.000 –0.080 –98.100 16.000 –0.080 –123.300 40.000 –0.040 –132.300 18.000 –0.060 –139.600 50.000 0.020 –168.200 20.000 –0.040 –156.500 60.000 0.070 153.600 22.000 –0.020 –173.800 70.000 0.040 112.100 24.000 0.000 168.200 80.000 –0.120 66.400 26.000 0.020 149.400 28.000 0.030 130.000 90.000 –0.460 14.600 30.000 0.020 109.400 32.000 0.010 87.700 34.000 –0.020 64.600 36.000 –0.030 39.500 100.000 –1.310 –49.300 110.000 –5.640 –129.000 120.000 –14.530 167.800 130.000 –23.800 126.700 140.000 –32.600 96.200 38.000 –0.010 11.400 40.000 –0.070 –22.000 150.000 –41.000 71.300 42.000 –0.920 –64.100 160.000 –49.200 49.200 –57.500 29.000 –66.500 9.800 44.000 –4.000 –110.100 170.000 46.000 –8.970 –147.000 180.000 48.000 –14.320 –173.500 190.000 –77.770 –2.320 166.800 200.000 –92.050 76.740 50.000 –19.460 Table 9. Gain/Phase for Figure 7. Typical Response, Pin 10 at V+ f CUTOFF = 100kHz, VS = ±7.5V, TA = 125°C, fCLK = 5MHz, Ratio = 50:1 FREQUENCY (kHz) GAIN (dB) PHASE (deg) FREQUENCY (kHz) GAIN (dB) PHASE (deg) 10.000 –0.071 –33.800 110.000 –7.420 172.100 20.000 –0.040 –67.800 120.000 –18.240 119.400 30.000 0.050 –102.500 130.000 –28.000 83.300 40.000 0.190 –138.300 140.000 –37.000 54.000 50.000 0.410 –176.100 150.000 –45.700 –27.600 60.000 0.670 143.100 160.000 –54.300 2.100 70.000 0.920 98.400 170.000 –63.300 –24.900 80.000 1.150 48.200 180.000 –73.610 –60.210 90.000 1.530 –10.900 190.000 –85.300 –138.990 100.000 1.110 –96.500 200.000 –83.390 129.580 10644fb 6 LTC1064-4 U U U PI FU CTIO S (Pin Numbers Refer to the 14-Pin Package) INV C, COMP1, INV A, COMP2 (Pins 1, 6, 7 and 13): To obtain a Cauer response with minimum passband ripple and cutoff frequencies above 20kHz, compensating components are required. Figure 6 uses ±7.5V power supplies and compensation components to achieve up to 40kHz sweepable cutoff frequencies and ±0.1dB passband ripple. Table 7 lists the typical amplitude response of Figure 6. Figure 7 illustrates the compensation scheme required to obtain a 100kHz cutoff frequency; Graph 4 and Tables 8 and 9 list the typical response of Figure 7 for 25°C and 125°C ambient temperature. As shown the ripple increases at high temperatures but still a ±0.25dB figure can be obtained for ambient temperatures below 70°C. VIN, VOUT (Pins 2, 9): The input Pin 2 is connected to a 12k 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 4). The op amp power supply wire (or trace) should be connected directly to the power source. To eliminate any output clock feedthrough, Pin 9 should be buffered with a simple R, C lowpass filter (Figure 5). The cutoff frequency of the output filter should be f CLK/3. 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 2). V +, V – (Pins 4, 12): Should be bypassed with a 0.1µF 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 (Figures 1 and 2). INV A, R(h, I) (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. NC (Pin 8 ): Pin 8 is not internally connected, it should be preferably grounded. 50/100 Ratio (Pin 10): For an f CLK/f C ratio of 50:1, Pin 10 should be tied to V +. For an f CLK/f –3dB ratio of 100:1, Pin 10 should be tied to V –. When Pin 10 is at midsupplies (i.e. ground), the filter response is neither Cauer nor transitional. Table 6 illustrates this response. Bypassing Pin 10 with a 0.1µF capacitor reduces the already small clock feedthrough. 10644fb 7 LTC1064-4 U TYPICAL APPLICATIO S 1 2 1 R(h, I) 14 13 COMP2* LTC1064-4 3 12 V– AGND VIN 4 V+ 5 0.1µF 1N5817 INV C 6 VIN V+ fCLK AGND COMP1* 7 INV A 50/100 VOUT NC 13 COMP2* LTC1064-4 3 12 V– AGND VIN V– 11 10 2 0.1µF 1N5817 4 V+= 15V 0.1µF V +/V – 9 5 1N5817 5k 6 VOUT V+/2 8 0.1µF R(h, I) 14 INV C VIN V+ fCLK 50/100 AGND COMP1* 7 INV A 5k NC Figure 1. Using Schottky Diodes to Protect the IC from Power Supply Spikes 2 4 V+ 1N5817 5k 5 6 0.1µF 1 13 COMP2* LTC1064-4 3 12 V– AGND VIN 5k V+ VIN V+ fCLK AGND COMP1* 7 INV A 50/100 VOUT NC 10 9 VOUT 8 Figure 2. Single Supply Operation. If Fast Power Up or Down Transients are Expected, Use a 1N5817 Schottky Diode Between Pin 4 and Pin 5. R(h, I) 14 INV C 0V TO 10V 1064-4 F02 1064-4 F01 1 VOUT 11 2 13 COMP2* LTC1064-4 3 12 AGND V– VIN 2.2k T2L LEVEL 11 10 5k 9 4 0.1µF 5 1µF 6 VOUT 8 VIN V+ fCLK AGND 50/100 COMP1* 7 INV A 1064-4 F03 POWER SOURCE V+ V– R(h, I) 14 INV C VOUT NC 0.1µF 11 10k 10 + – V /V 9 10k 8 8 VOUT + 4 RECOMMENDED OP AMPS: LT1022, LT318, LT1056 Figure 3. Level Shifting the Input T2L Clock for Single Supply Operation ≥6V. – 0.1µF 1064-4 F04 0.1µF Figure 4. Buffering the Filter Output. The Buffer Op Amp Should Not Share the LTC1064-4 Power Lines. 1 VIN V+ 0.1µF 2 INV C R(h, I) 14 13 COMP2* LTC1064-4 3 12 V– AGND 4 5 6 7 VIN V+ AGND COMP1* INV A fCLK 50/100 VOUT NC V– 10k 0.1µF 11 VOUT 200pF 10 + – V /V 9 8 4.99k 4.99k – 50Ω LT1056 430pF + 0.027µF 1064-4 F05 Figure 5. Adding an Output Buffer-Filter to Eliminate Any Clock Feedthrough. Passband Error of Output Buffer is ±0.1dB to 50kHz, –3dB at 94kHz. 10644fb 8 LTC1064-4 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 10644fb 9 LTC1064-4 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 10644fb 10 LTC1064-4 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 × 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 10644fb 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 LTC1064-4 U TYPICAL APPLICATIO S 5pF 1 2 INV C 30pF 1M R(h, I) 14 13 COMP2* LTC1064-4 3 12 AGND V– VIN 4 7.5V 0.1µF 5 6 453k 1 VIN V+ AGND COMP1* 7 INV A fCLK 50/100 VOUT NC 11 2 13 COMP2* LTC1064-4 3 12 AGND V– VIN –7.5V ≤2MHz 0.1µF 10 + V 4 7.5V 0.1µF 5 6 9 1M R(h, I) 14 INV C VOUT 453k 8 VIN V+ fCLK AGND 50/100 COMP1* 7 INV A 1064-4 F06 VOUT NC 11 10 –7.5V 5MHz 0.1µF V+ 9 VOUT 8 1064-4 F07 5pF 30pF Figure 6. Compensating LTC1064-4 for Passband Ripple of ±0.1dB and fCUTOFF Sweeps to 40kHz. Figure 7. Compensating LTC1064-4 for fCUTOFF = 100kHz, Gain at fCUTOFF = –1.3dB, Table 8. RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1069-1 8th Order Elliptic Lowpass S0-8 Package, Low Power LTC1069-6 Single Supply, 8th Order Elliptic Lowpass S0-8 Package, Very Low Power LTC1569-6 DC Accurate, 10th Order Lowpass Internal Precision Clock, Low Power, S0-8 Package LTC1569-7 DC Accurate, 10th Order Lowpass Internal Precision Clock, Delay Equalized, S0-8 Package 10644fb 12 Linear Technology Corporation LW/TP 1202 1K REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1991