LMF100CIWMX National Semiconductor, LMF100CIWMX Datasheet
LMF100CIWMX
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LMF100CIWMX Summary of contents
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... 4th-order biquadratic function can be re- alized with a single LMF100. Higher order filters are imple- mented by simply cascading additional packages, and all the classical filters (such as Butterworth, Bessel, Elliptic, and Chebyshev) can be realized. The LMF100 is fabricated on National Semiconductor’s high performance analog silicon gate ...
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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 14) + − Supply Voltage (V − Voltage at Any Pin Input Current at Any Pin (Note 2) Package Input Current (Note 2) Power Dissipation (Note 3) Storage Temperature ...
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Electrical Characteristics The following specifications apply for Mode specified. Boldface limits apply for T MIN Symbol Parameter I Input Current on Pins 10, 11, 12, 16, 17 Electrical Characteristics The ...
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Logic Input Characteristics Boldface limits apply for MIN MAX Parameter Conditions + = +5V, V CMOS Clock MIN Logical “1” Input Voltage MAX Logical “0” V LSh + = +10V, V MIN Logical “1” ...
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Typical Performance Characteristics Power Supply Current vs Power Supply Voltage DS005645-40 Positive Output Swing vs Temperature DS005645-43 Negative Output Voltage Swing vs Load Resistance DS005645- Ratio vs f CLK 0 CLK DS005645-49 Power Supply Current vs Temperature DS005645-41 ...
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Typical Performance Characteristics f /f Ratio vs f CLK 0 CLK DS005645-52 Q Deviation vs Clock Frequency DS005645-55 Q Deviation vs Clock Frequency DS005645-58 www.national.com (Continued Ratio vs Temperature CLK 0 DS005645-53 Q Deviation vs Clock Frequency DS005645-56 ...
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Typical Performance Characteristics Maximum ± 7.5V s DS005645-61 LMF100 System Block Diagram (Continued) Maximum ± V 5.0V s DS005645-62 7 Maximum ...
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Pin Descriptions LP(1,20), The second order lowpass, BP(2,19), bandpass and N/AP/HP(3,18) notch/allpass/highpass outputs. These outputs can typically swing to within 1V of each supply when driving load. For optimum performance, capacitive loading on these outputs should be ...
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Definitions of Terms f : the frequency of the external clock signal applied to pin CLK center frequency of the second order function complex 0 pole pair measured at the bandpass outputs ...
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Definitions of Terms (a) (a) www.national.com (Continued) DS005645-21 FIGURE 2. 2nd-Order Low-Pass Response DS005645-23 FIGURE 3. 2nd-Order High-Pass Response 10 DS005645-22 (b) DS005645-24 (b) ...
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Definitions of Terms (Continued) DS005645-25 (a) FIGURE 4. 2nd-Order Notch Response DS005645-27 (a) FIGURE 5. 2nd-Order All-Pass Response DS005645-26 (b) DS005645-28 (b) 11 www.national.com ...
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Definitions of Terms (a) Bandpass DS005645-64 (d) Notch DS005645-67 FIGURE 6. Response of various 2nd-order filters as a function of Q. Gains and center frequencies are normalized to unity. www.national.com (Continued) (b) Low Pass DS005645-65 (e) All-Pass DS005645-68 12 ...
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Modes of Operation The LMF100 is a switched capacitor (sampled data) filter. To fully describe its transfer functions, a time domain analysis is appropriate. Since this is cumbersome, and since the LMF100 closely approximates continuous filters, the follow- ing ...
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Modes of Operation MODE 1b: Notch 1, Bandpass, Lowpass Outputs (See Figure 9 ) notch 0 www.national.com MODE 2: Notch 2, Bandpass, Lowpass: f (Continued) (See Figure 10 ) FIGURE 9. MODE 1b FIGURE 10. MODE ...
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Modes of Operation (Continued) MODE 3: Highpass, Bandpass, Lowpass Outputs (See Figure Mode 3, the feedback loop is closed around the input summing amplifier; the finite GBW product of this op amp causes a slight ...
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Modes of Operation MODE 4: Allpass, Bandpass, Lowpass Outputs (See Figure Due to the sampled data nature of the filter, a slight mismatch of f occurs causing a 0.4 dB peaking around f of the allpass ...
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Modes of Operation (Continued) MODE 6a: Single Pole, HP, LP Filter (See Figure 15 ) DS005645-6 FIGURE 13. MODE 4 DS005645-15 FIGURE 14. MODE 5 DS005645-16 FIGURE 15. MODE 6a 17 www.national.com ...
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Modes of Operation MODE 6b: Single Pole LP Filter (Inverting and Non- Inverting) (See Figure 16 ) www.national.com (Continued) FIGURE 16. MODE 6b MODE 6c: Single Pole, AP, LP Filter (See Figure 17 ) FIGURE 17. MODE 6c 18 ...
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Modes of Operation (Continued) MODE 7: Summing Integrator (See Figure 18 ) DS005645-37 Equivalent Circuit DS005645-38 FIGURE 18. MODE 7 19 www.national.com ...
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Modes of Operation TABLE 1. Summary of Modes. Realizable filter types (e.g. low-pass) denoted by asterisks. Unless otherwise noted, gains of various filter outputs are inverting and adjustable by resistor ratios. Mode (2) = ...
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Applications Information (Continued) 3.1 DESIGN EXAMPLE In order to design a filter using the LMF100, we must define the necessary values of three parameters for each second-order section the filter section’s center frequency the ...
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Applications Information FIGURE 19. Fourth-order Chebyshev low-pass filter from example in 3.1. ± 5V power supply. 0V–5V TTL or FIGURE 20. Fourth-order Chebyshev low-pass filter from example in 3.1. Single +10V power supply. 0V–5V TTL logic levels. Input signals ...
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Applications Information DS005645-32 (a) Resistive Divider with Decoupling Capacitor FIGURE 21. Three Ways of Generating V 3.2 SINGLE SUPPLY OPERATION The LMF100 can also operate with a single-ended power supply. Figure 20 shows the example filter with a single-ended ...
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Applications Information (Continued) Mode 1b Mode 2 and Mode 5 In many applications, the outputs are ac coupled and dc off- sets are not bothersome unless large signals are applied to the filter input. However, larger offset voltages will ...
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Applications Information = 100 100 100 FIGURE 23. Second-Order Notch Filter FIGURE 24. Method for ...
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Applications Information (Continued) signals. In noise-sensitive applications, a ratio of 100:1 will result lower output noise for the same filter configu- ration. The accuracy of the f /f ratio is dependent on the value of CLK ...
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Physical Dimensions inches (millimeters) unless otherwise noted Small Outline Package Order Number LMF100CIWM NS Package Number M20B Molded Dual-In-Line Package (N) Order Number LMF100CCN NS Package Number N20A 27 www.national.com ...
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... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...