LTC1069-6 Single Supply, Very Low Power, Elliptic Lowpass Filter FEATURES DESCRIPTION n The LTC(R)1069-6 is a monolithic low power, 8th order lowpass filter optimized for single 3V or single 5V supply operation. The LTC1069-6 typically consumes 1mA under single 3V supply operation and 1.2mA under 5V operation. n n n n n n n n n n 8th Order Elliptic Filter in SO-8 Package Single 3V Operation: Supply Current: 1mA (Typ) fCUTOFF: 14kHz (Max) S/N Ratio: 72dB Single 5V Operation: Supply Current: 1.2mA (Typ) fCUTOFF: 20kHz (Max) S/N Ratio: 79dB 0.1dB Passband Ripple Up to 0.9fCUTOFF (Typ) 42dB Attenuation at 1.3fCUTOFF 66dB Attenuation at 2.0fCUTOFF 70dB Attenuation at 2.1fCUTOFF Wide Dynamic Range, 75dB or More (S/N + THD), Under Single 5V Operation Wideband Noise: 120VRMS Clock-to-fCUTOFF Ratio: 50:1 Internal Sample Rate: 100:1 APPLICATIONS n n n n n n The cutoff frequency of the LTC1069-6 is clock tunable and it is equal to the clock frequency divided by 50. The input signal is sampled twice per clock cycle to lower the risk of aliasing. The typical passband ripple is 0.1dB up to 0.9fCUTOFF . The gain at fCUTOFF is -0.7dB. The transition band of the LTC1069-6 features progressive attenuation reaching 42dB at 1.3fCUTOFF and 70dB at 2.1fCUTOFF. The maximum stopband attenuation is 72dB. The LTC1069-6 can be clock tuned for cutoff frequencies up to 20kHz (single 5V supply) and for cutoff frequencies up to 14kHz (single 3V supply). The low power feature of the LTC1069-6 does not penalize the device's dynamic range. With single 5V supply and an input range of 0.4VRMS to 1.4VRMS , the Signal-to(Noise + THD) ratio is 70dB. The wideband noise of the LTC1069-6 is 125VRMS . Handheld Instruments Telecommunication Filters Antialiasing Filters Smoothing Filters Audio Multimedia Other filter responses with higher speed can be obtained. Please contact LTC Marketing for details. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. The LTC1069-6 is available in an 8-pin SO package. TYPICAL APPLICATION Frequency Response 10 VIN = 500mVRMS 0 Single 3V Supply 10kHz Elliptic Lowpass Filter -20 VOUT GAIN (dB) AGND 3V V+ 0.47F 0.1F V- LTC1069-6 NC NC VIN CLK -10 -30 -40 -50 -60 fCLK = 500kHz -70 1069-6 TA01 -80 5 10 20 15 FREQUENCY (kHz) 25 1069-6 TA02 10696fa 1 LTC1069-6 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION Total Supply Voltage (V + to V -) ................................12V Operating Temperature Range LTC1069-6C ............................................. 0C to 70C LTC1069-6I ..........................................- 40C to 85C Storage Temperature..............................- 65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C TOP VIEW AGND 1 8 VOUT V+ 2 7 V- NC 3 6 NC VIN 4 5 CLK S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 130C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1069-6CS8#PBF LTC1069-6CS8#TRPBF 10696 8-Lead Plastic SO 0C to 70C LTC1069-6IS8#PBF LTC1069-6IS8#TRPBF 10696I 8-Lead Plastic SO -40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range. fCUTOFF is the filter's cutoff frequency and is equal to fCLK/50. The fCLK signal level is TTL or CMOS (clock rise or fall time 1s) RL = 10k, VS = 5V, TA = 25C, unless otherwise specified. All AC gains are measured relative to the passband gain. SYMBOL CONDITIONS Passband Gain (fIN 0.2fCUTOFF) VS = 5V, fCLK = 200kHz fTEST = 0.25kHz, VIN = 1VRMS Gain at 0.50fCUTOFF Gain at 0.75fCUTOFF Gain at 0.90fCUTOFF Gain at 0.95fCUTOFF MIN TYP MAX UNITS l - 0.25 - 0.30 0.1 0.1 0.45 0.50 db db VS = 3V, fCLK = 200kHz fTEST = 0.25kHz, VIN = 0.5VRMS l - 0.25 - 0.30 0.1 0.1 0.45 0.50 db db VS = 5V, fCLK = 200kHz fTEST = 2.0kHz, VIN = 1VRMS l - 0.10 - 0.15 0.07 0.07 0.25 0.30 db db VS = 3V, fCLK = 200kHz fTEST = 2.0kHz, VIN = 0.5VRMS l - 0.15 - 0.20 0.07 0.07 0.25 0.30 db db VS = 5V, fCLK = 200kHz fTEST = 3.0kHz, VIN = 1VRMS l - 0.25 - 0.30 0 0 0.25 0.30 db db VS = 3V, fCLK = 200kHz fTEST = 3.0kHz, VIN = 0.5VRMS l - 0.25 - 0.30 0 0 0.25 0.30 db db VS = 5V, fCLK = 200kHz fTEST = 3.6kHz, VIN = 1VRMS l - 0.25 - 0.25 0.1 0.1 0.45 0.45 db db VS = 3V, fCLK = 200kHz fTEST = 3.6kHz, VIN = 0.5VRMS l - 0.25 - 0.30 0.1 0.1 0.45 0.50 db db VS = 5V, fCLK = 200kHz fTEST = 3.8kHz, VIN = 1VRMS l - 0.35 - 0.45 0.05 0.05 0.25 0.25 db db VS = 3V, fCLK = 200kHz fTEST = 3.8kHz, VIN = 0.5VRMS l - 0.45 - 0.55 0.05 0.05 0.25 0.35 db db 10696fa 2 LTC1069-6 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range. fCUTOFF is the filter's cutoff frequency and is equal to fCLK/50. The fCLK signal level is TTL or CMOS (clock rise or fall time 1s) RL = 10k, VS = 5V, TA = 25C, unless otherwise specified. All AC gains are measured relative to the passband gain. SYMBOL CONDITIONS Gain at fCUTOFF VS = 5V, fCLK = 200kHz fTEST = 4.0kHz, VIN = 1VRMS Gain at 1.30fCUTOFF Gain at 2.00fCUTOFF MIN TYP MAX UNITS l - 1.50 - 1.65 -0.07 -0.07 -0.20 -0.25 db db VS = 3V, fCLK = 200kHz fTEST = 4.0kHz, VIN = 0.5VRMS l - 1.5 - 1.7 -0.07 -0.07 0 0 db db VS = 5V, fCLK = 200kHz fTEST = 5.2kHz, VIN = 1VRMS l -42 -42 -40 -39 db db VS = 3V, fCLK = 200kHz fTEST = 5.2kHz, VIN = 0.5VRMS l -41 -41 -38 -37 db db VS = 5V, fCLK = 200kHz fTEST = 8.0kHz, VIN = 1VRMS l -66 -66 -61 -60 db db VS = 3V, fCLK = 200kHz fTEST = 8.0kHz, VIN = 0.5VRMS l -66 -66 -60 -59 db dB 0.15 0 0.5 0.5 db db 175 135 mV mV Gain at 0.95fCUTOFF VS = 5V, fCLK = 400kHz, fTEST = 7.6kHz, VIN = 1VRMS VS = 3V, fCLK = 400kHz, fTEST = 7.6kHz, VIN = 0.5VRMS Output DC Offset (Note 1) VS = 5V, fCLK = 100kHz VS = 3V, fCLK = 100kHz 50 30 Output DC Offset Tempco VS = 5V, VS = 3V 30 V/C Output Voltage Swing (Note 2) VS = 5V, fCLK = 100kHz VS = 3V, fCLK = 100kHz Power Supply Current VS = 5V, fCLK = 100kHz VS = 3V, fCLK = 100kHz Maximum Clock Frequency - 0.5 - 0.5 l 3.4 3.2 4.2 4.2 VP-P VP-P l 1.6 1.6 2.0 2.0 VP-P VP-P l l VS = 5V VS = 3V 1.60 1.65 mA mA 1 1.40 1.55 mA mA 1 0.7 Input Frequency Range 0 Input Resistance 35 Operating Supply Voltage (Note 3) 3 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The input offset voltage is measured with respect to AGND (Pin 1). The input (Pin 4) is also shorted to the AGND pin. The analog ground pin potential is internally set to (0.437)(VSUPPLY). 1.2 MHz MHz <(fCLK - 2fC) 50 80 k 10 V Note 3: The input voltage can swing to either rail (V + or ground); the output typically swings 50mV from ground and 0.8V from V+. Note 4: The LTC1069-6 is optimized for 3V and 5V operation. Although the device can operate with a single 10V supply or 5V, the total harmonic distortion will be degraded. For single 10V or 5V supply operation we recommend to use the LTC1069-1. 10696fa 3 LTC1069-6 TYPICAL PERFORMANCE CHARACTERISTICS Transition Band Gain vs Frequency Passband Gain vs Frequency 2 VS = SINGLE 3V fCLK = 500kHz fCUTOFF = 10kHz VIN = 0.5VRMS 1 VS = SINGLE 3V fCLK = 500kHz fCUTOFF = 10kHz VIN = 0.5VRMS 0 -10 0 -1 3 1 7 5 FREQUENCY (kHz) 9 -40 -50 -74 -80 -78 -80 16 14 FREQUENCY (kHz) 18 20 20 1 3 5 10 -10 GAIN (db) -20 0 fCLK 500kHz fCUTOFF 10kHz fCLK 750kHz fCUTOFF 15kHz -50 fCLK 1MHz -70 fCUTOFF 20kHz -80 Phase vs Frequency 3 5 VS = SINGLE 5V fCLK = 500kHz fCUTOFF = 10kHz -450 -540 -630 100 1069-6 G06 Transient Response 3.00E-04 0.5V/DIV GROUP DELAY (SEC) -360 10 FREQUENCY (kHz) VS = SINGLE 5V fCLK = 500kHz fCUTOFF = 10kHz 3.50E-04 -270 SINGLE 3V 1 7 9 11 13 15 17 19 21 FREQUENCY (kHz) Group Delay vs Frequency 4.00E-04 -180 SINGLE 5V 1069-6 G05 90 -90 -40 -90 1 1069-6 G04 0 -30 -60 -1 -2 100 fCLK = 500kHz VIN = 0.5VRMS 0 1 7 9 11 13 15 17 19 21 FREQUENCY (kHz) 80 60 FREQUENCY (kHz) Amplitude Response vs Supply Voltage VS = SINGLE 5V VIN = 1VRMS fCLK = 500kHz fCUTOFF = 10kHz -1 40 1069-6 G03 2 GAIN (dB) GAIN (dB) 12 10 Passband Gain vs Clock Frequency 0 -72 -76 Passband Gain vs Clock Frequency fCLK = 750kHz fCUTOFF = 15kHz -70 -70 1069-6 G02 1 -68 -60 VS = SINGLE 3V VIN = 0.5VRMS PHASE (DEG) -66 1069-6 G01 2 -2 -64 -30 -90 11 VS = SINGLE 3V fCLK = 500kHz fCUTOFF = 10kHz VIN = 0.5VRMS -62 GAIN (dB) GAIN (dB) GAIN (dB) -20 -2 Stopband Gain vs Frequency -60 10 2.50E-04 2.00E-04 1.50E-04 1.00E-04 -720 5.00E-05 -810 -900 0 2 4 8 6 10 FREQUENCY (kHz) 12 14 1069-6 G07 0.00E+00 0 2 4 8 6 FREQUENCY (kHz) 10 12 VS = SINGLE 5V 0.1ms/DIV fCLK = 1MHz fIN = 1kHz 2Vp-p SQUARE WAVE 1069-6 G09 1069-6 G08 10696fa 4 LTC1069-6 TYPICAL PERFORMANCE CHARACTERISTICS Dynamic Range THD + Noise vs Input/Output Voltage Dynamic Range THD + Noise vs Input Voltage VIN = 2.945VP-P -55 THD + NOISE (dB) THD + NOISE (dB) fCLK = 170kHz -45 fCUTOFF = 3.4kHz f = 1kHz -50 IN -60 -65 -70 -75 THD + Noise vs Frequency -40 -40 fCLK = 500kHz -45 fIN = 1kHz fCLK = 500kHz -45 fCUTOFF = 10kHz -50 -50 -55 THD + NOISE (dB) -40 VS = SINGLE 3V -60 VS = SINGLE 5V -65 -70 -75 -55 -65 -70 -75 -80 -80 -85 -85 -85 -90 0.1 -90 0.1 -80 1 INPUT/OUTPUT VOLTAGE (VP-P) 3 VS = SINGLE 5V VIN = 1VRMS -90 0.5 0.76 1 1.43 INPUT VOLTAGE (VRMS) 1069-6 G14 1 5 5 FREQUENCY (kHz) 1069-6 G10 10 1069-6 G11 Output Voltage Swing vs Temperature Supply Current vs Supply Voltage POSITIVE SWING (V) 5 4 3 4.5 RL = 10k VS = SINGLE 5V 4.0 2.5 VS = SINGLE 3V 2.0 85C 25C 2 -40C 1 0 0 2 8 6 4 10 12 14 TOTAL SUPPLY VOLTAGE (V) 16 NEGATIVE SWING (mV) SUPPLY CURRENT (mA) VS = SINGLE 3V VIN = 0.5VRMS -60 80 60 VS = SINGLE 3V 40 20 VS = SINGLE 5V 0 -40 -20 0 20 40 60 AMBIENT TEMPERATURE (C) 1069-6 G12 80 1069-6 G13 PIN FUNCTIONS AGND (Pin 1): Analog Ground. The quality of the analog signal ground can affect the filter performance. For either single or dual supply operation, an analog ground plane surrounding the package is recommended. The analog ground plane should be connected to any digital ground at a single point. For single supply operation, Pin 1 should be bypassed to the analog ground plane with a 0.47F capacitor or larger. An internal resistive divider biases Pin 1 to 0.4366 times the total power supply of the device (Figure 1). That is, with a single 5V supply, the potential at Pin 1 is 2.183V 1%. As the LTC1069-6 is optimized 1 AGND 2 V+ VOUT 8 V- 7 11.325k 8.775k 3 4 NC NC LTC1069-6 VIN CLK 6 5 1069-6 F01 Figure 1. Internal Biasing of the Analog Ground (Pin 1) 10696fa 5 LTC1069-6 PIN FUNCTIONS for single supply operation, the internal biasing of Pin 1 allows optimum output swing. The AGND pin should be buffered if used to bias other ICs. Figure 2 shows the connections for single supply operation. 1 0.47F V+ 2 AGND V+ 0.1F 3 4 VIN VOUT V- LTC1069-6 NC NC VIN CLK 8 VOUT 7 6 5 ANALOG GROUND PLANE STAR SYSTEM GROUND DIGITAL GROUND PLANE 1k CLOCK SOURCE 1069-6 F02 Figure 2. Connections for Single Supply Operation V +, V - (Pins 2, 7): Power Supply Pins. The V + (Pin 2) and the V - (Pin 7, if used) should be bypassed with a 0.1F capacitor to an adequate analog ground. The filter's power supplies should be isolated from other digital or high voltage analog supplies. A low noise linear supply is recommended. Switching power supplies will lower the signal-to-noise ratio of the filter. Unlike previous monolithic filters, the power supplies can be applied in any order, that is, the positive supply can be applied before the negative supply and vice versa. Figure 3 shows the connection for dual supply operation. 1 2 V+ 0.1F 3 4 VIN AGND VOUT V+ V- LTC1069-6 NC NC VIN CLK 8 7 VOUT V- 0.1F 6 5 ANALOG GROUND PLANE STAR SYSTEM GROUND DIGITAL GROUND PLANE NC (Pins 3, 6): No Connection. Pins 3 and 6 are not connected to any internal circuitry; they should be tied to ground. VIN (Pin 4): Filter Input Pin. The Filter Input pin is internally connected to the inverting input of an op amp through a 50k resistor. CLK (Pin 5): Clock Input Pin. Any TTL or CMOS clock source with a square wave output and 50% duty cycle (10%) is an adequate clock source for the device. The power supply for the clock source should not necessarily be the filter's power supply. The analog ground of the filter should be connected to the clock's ground at a single point only. Table 1 shows the clock's low and high level threshold value for a dual or single supply operation. A pulse generator can be used as a clock source provided the high level ON time is greater than 0.42s (VS = 5V). Sine waves less than 100kHz are not recommended for clock frequencies because, excessive slow clock rise or fall times generate internal clock jitter. The maximum clock rise or fall time is 1s. The clock signal should be routed from the right side of the IC package to avoid coupling into any input or output analog signal path. A 1k resistor between the clock source and the Clock Input (Pin 5) will slow down the rise and fall times of the clock to further reduce charge coupling (Figure 1). Table 1. Clock Source High and Low Thresholds POWER SUPPLY HIGH LEVEL LOW LEVEL Dual Supply = 5V 1.5V 0.5V Single Supply = 10V 6.5V 5.5V Single Supply = 5V 1.5V 0.5V Single Supply = 3.3V 1.2V 0.5V VOUT (Pin 8): Filter Output Pin. Pin 8 is the output of the filter, and it can source 8mA or sink 1mA. The total harmonic distortion of the filter will degrade when driving coaxial cables or loads less than 20k without an output buffer. 1k CLOCK SOURCE 1069-6 F03 Figure 3. Connections for Dual Supply Operation 10696fa 6 LTC1069-6 APPLICATIONS INFORMATION Temperature Behavior 2 VS = SINGLE 3V VIN = 0.5VRMS 1 GAIN (dB) The power supply current of the LTC1069-6 has a positive temperature coefficient. The GBW product of its internal op amps is nearly constant and the speed of the device does not degrade at high temperatures. Figures 4a, 4b and 4c show the behavior of the passband of the device for various supplies and temperatures. The filter has a passband behavior which is temperature independent. 85C 0 -2 The clock feedthrough is defined as the RMS value of the clock frequency and its harmonics that are present at the filter's Output (Pin 8). The clock feedthrough is tested with the Input (Pin 4) shorted to AGND (Pin 1) and depends on PC board layout and on the value of the power supplies. With proper layout techniques the values of the clock feedthrough are shown in Table 2. CLOCK FEEDTHROUGH 3.3V 100VRMS 5V 170VRMS 10V 350VRMS 1 3 5 7 9 11 13 15 17 19 21 FREQUENCY (kHz) 1069-6 F04a Figure 4a 2 VS = SINGLE 5V VIN = 1VRMS 1 GAIN (dB) VS fCLK = 500kHz fCUTOFF = 10kHz -1 Clock Feedthrough Table 2. Clock Feedthrough -40C 85C 0 -40C fCLK = 750kHz fCUTOFF = 15kHz -1 -2 Any parasitic switching transients during the rising and falling edges of the incoming clock are not part of the clock feedthrough specifications. Switching transients have frequency contents much higher than the applied clock; their amplitude strongly depends on scope probing techniques as well as grounding and power supply bypassing. The clock feedthrough can be reduced by adding a single RC lowpass filter at the Output (Pin 8). 1 3 5 7 9 11 13 15 17 19 21 FREQUENCY (kHz) 1069-6 F04a Figure 4b 2 VS = 5V VIN = 1.5VRMS GAIN (dB) 1 85C 0 -40C fCLK = 1MHz fCUTOFF = 20kHz -1 -2 1 4 7 10 13 16 19 22 25 28 31 FREQUENCY (kHz) 1069-6 F04c Figure 4c 10696fa 7 LTC1069-6 APPLICATIONS INFORMATION Wideband Noise Aliasing The wideband noise of the filter is the total RMS value of the device's noise spectral density and determines the operating signal-to-noise ratio. The frequency contents of the wideband noise lie within the filter's passband. The wideband noise cannot be reduced by adding post filtering. The total wideband noise is nearly independent of the clock frequency and depends slightly on the power supply voltage (see Table 3). The clock feedthrough specifications are not part of the wideband noise. Aliasing is an inherent phenomenon of sampled data systems and occurs for input frequencies approaching the sampling frequency. The internal sampling frequency of the LTC1069-6 is 100 times its cutoff frequency. For instance, if a 98.5kHz, 100mVRMS signal is applied at the input of an LTC1069-6 operating with a 50kHz clock, a 1.5kHz, 484VRMS alias signal will appear at the filter output. Table 4 shows details. Table 3. Wideband Noise Table 4. Aliasing (fCLK = 50kHz) INPUT FREQUENCY (VIN = 1VRMS) (kHz) OUTPUT LEVEL (Relative to Input) (dB) OUTPUT FREQUENCY (Aliased Frequency) (kHz) VS WIDEBAND NOISE 3.3V 118VRMS 5V 123VRMS 96 (or 104) -78.3 4.0 127VRMS 97 (or 103) -70.4 3.0 98 (or 102) - 80.6 2.0 98.5 (or 101.5) -46.3 1.5 99 (or 101) -2.8 1.0 99.5 (or 100.5) -1.38 0.5 5V fCLK/fC = 50:1, fCUTOFF = 1kHz 10696fa 8 LTC1069-6 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) .189 - .197 (4.801 - 5.004) NOTE 3 .045 .005 .050 BSC 8 .245 MIN 7 6 5 .160 .005 .150 - .157 (3.810 - 3.988) NOTE 3 .228 - .244 (5.791 - 6.197) .030 .005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 - .020 s 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP .016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN .053 - .069 (1.346 - 1.752) .014 - .019 (0.355 - 0.483) TYP INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 2 3 4 .004 - .010 (0.101 - 0.254) .050 (1.270) BSC SO8 0303 10696fa 9 LTC1069-6 TYPICAL APPLICATION Single 5V Operation with Power Shutdown 5V ON SHUTDOWN 1 AGND 2 0.47F 8 VOUT VOUT 7 V- V+ LTC1069-6 3 6 NC NC 0.1F VIN 4 VIN 5 CLK fCLK 750kHz 5V 0V 1069-6 TA03 Single 3V Supply Operation with Output Buffer 3.3V 0.1F 8 5 7 V- V+ LTC1069-6 3 6 NC NC 6 1 0.47F AGND VOUT 2 0.1F 4 VIN VIN CLK 5 + 8 7 1/2 LT1366 fCLK 500kHz - 3.3V 0V VOUT 4 1069-6 TA04 Single 3V Supply Voice Band Lowpass Filter with Rail-to-Rail Input and Output 3V 1 1F 3V 0.1F - 1/2 LT1366 10k 3 270pF + VOUT 5 8 2 7 V- V+ LTC1069-6 3 6 NC NC 4 2 AGND VIN CLK 5 0.1F 8 + 7 1/2 LT1366 6 - 10k 170kHz 40.2k 1069-6 TA05 1 4 40.2k RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1068 Very Low Noise, High Accuracy, Quad Universal Filter Building Block User-Configurable, SSOP Package LTC1069-1 Low Power, Progressive Elliptic LPF fCLK/fC Ratio 100:1, 8-Pin SO Package LTC1164-5 Low Power 8th Order Butterworth LPF fCLK/fC Ratio 100:1 and 50:1 LTC1164-6 Low Power 8th Order Elliptic LPF fCLK/fC Ratio 100:1 and 50:1 LTC1164-7 Low Power 8th Order Linear Phase LPF fCLK/fC Ratio 100:1 and 50:1 10696fa 10 Linear Technology Corporation LT 0309 REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2008