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MAX292CSA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX292CSA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 10 page 8th-Order, Lowpass, Switched-Capacitor Filters 8 _______________________________________________________________________________________ order continuous lowpass filter. This filter is convenient for anti-aliasing applications, or for clock noise attenuation at the switched-capacitor filter’s output. Figure 4 shows a 2nd-order lowpass Butterworth filter built using the uncommitted op amp with a 10kHz corner frequency. This filter’s input resistance of 22k satisfies the minimum load requirements of the switched-capacitor filter. The uncommitted op amp (with a 2MHz gain bandwidth product) can alternatively be used at the input of the switched-capacitor filter to help reduce any possible clock ripple feedthrough to the output. DAC Post-Filtering When using the MAX291/MAX292/MAX295/MAX296 for DAC post-filtering, synchronize the DAC and the filter clocks. If clocks are not synchronized, beat frequen- cies will alias into the desired passband. The DAC’s clock should be generated by dividing down the switched-capacitor filter’s clock. Harmonic Distortion Harmonic distortion arises from nonlinearities within the filters. These nonlinearities generate harmonics when a pure sine wave is applied to the filter input. Table 2 lists typical harmonic distortion values for the MAX291/ MAX292/MAX295/MAX296 with a 1kHz 5Vp-p sine-wave input signal, a 1 MHz clock frequency, and a 5k Ω load. MAX29_ 4 C1 330pF 3 INPUT C2 1500pF 22k R1 22k R2 22k R3 OUTPUT OP OUT OP IN Figure 4. Uncommitted Op Amp Configured as a 2nd-Order Butterworth Lowpass Filter (Fo = 10kHz) Table 2. Typical Harmonic Distortion (dB) -96 -92 -82 -83 -96 -97 -88 -89 -71 -93 -71 -72 -89 -86 -82 -78 4th 5th 2nd 3rd Filter Harmonic MAX296 MAX295 MAX292 MAX291 _Ordering Information (continued) * Contact factory for dice specifications. ** Contact factory for availability and processing to MIL-STD-883. Pin Configuration is 8-pin DIP/SO. 8 CERDIP** -55°C to +125°C MAX296MJA 16 Wide SO 8 Plastic DIP Dice* 0°C to +70°C -40°C to +85°C -40°C to +85°C MAX296EWE 16 Wide SO 0°C to +70°C MAX296EPA MAX296C/D MAX296CWE 8 Plastic DIP 8 CERDIP** 16 Wide SO -40°C to +85°C -55°C to +125°C 0°C to +70°C MAX296CPA MAX295MJA MAX295EWE 8 Plastic DIP -40°C to +85°C MAX295EPA Dice* 16 Wide SO 0°C to +70°C 0°C to +70°C MAX295C/D 8 Plastic DIP 0°C to +70°C MAX295CWE MAX295CPA 8 CERDIP** -55°C to +125°C MAX292MJA 16 Wide SO 8 Plastic DIP Dice* 0°C to +70°C -40°C to +85°C -40°C to +85°C MAX292EWE 16 Wide SO 0°C to +70°C MAX292EPA MAX292C/D MAX292CWE PIN-PACKAGE TEMP. RANGE PART 8 Plastic DIP 0°C to +70°C MAX292CPA 8 SO 0°C to +70°C MAX292CSA 8 SO -40°C to +85°C MAX292ESA 8 SO 0°C to +70°C MAX295CSA 8 SO -40°C to +85°C MAX295ESA 8 SO 0°C to +70°C MAX296CSA 8 SO -40°C to +85°C MAX296ESA |
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