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MAX7427CPA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX7427CPA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters 10 ______________________________________________________________________________________ Characteristics table for the input voltage range of COM and OS. Changing the voltage on COM or OS signifi- cantly from midsupply reduces the dynamic range. Power Supplies The MAX7426 operates from a single +5V supply, and the MAX7427 operates from a single +3V supply. Bypass VDD to GND with a 0.1µF capacitor. If dual supplies are required, connect COM to the system ground and GND to the negative supply. Figure 4 shows an example of dual-supply operation. Single- supply and dual-supply performance are equivalent. For either single-supply or dual-supply operation, drive CLK and SHDN from GND (V- in dual-supply operation) to VDD. Use the MAX7427 for ±2.5, and use the MAX7426 for ±1.5V. For ±5V dual-supply applications, refer to the MAX291/MAX292/MAX295/MAX296 and MAX293/MAX294/MAX297 data sheets. Input Signal Amplitude Range The optimal input signal range is determined by observ- ing the voltage level at which the signal-to-noise plus distortion (SINAD) ratio is maximized for a given corner frequency. The Typical Operating Characteristics show the THD + Noise response as the input signal’s peak-to- peak amplitude is varied. Anti-Aliasing and Post-DAC Filtering When using the MAX7426/MAX7427 for anti-aliasing or post-DAC filtering, synchronize the DAC (or ADC) and the filter clocks. If the clocks are not synchronized, beat frequencies may alias into the desired passband. Harmonic Distortion Harmonic distortion arises from nonlinearities within the filter. These nonlinearities generate harmonics when a pure sine wave is applied to the filter input. Table 2 lists typical harmonic distortion values with a 10k Ω load at TA = +25°C. VDD V+ V- IN CLK GND INPUT OUTPUT OUT 0.1 µF CLOCK *CONNECT SHDN TO V- FOR LOW-POWER SHUTDOWN MODE. SHDN COM OS 0.1 µF MAX7426 MAX7427 * V+ V- Figure 4. Dual-Supply Operation Table 2. Typical Harmonic Distortion FILTER fIN (Hz) VIN (Vp-p) 2nd 4th fCLK (kHz) TYPICAL HARMONIC DISTORTION (dB) 3rd 5th MAX7426 1k 200 4 500 100 -73 -71 -88 1k -90 -92 MAX7427 200 2 500 100 -87 -90 -90 -90 -82 -86 -86 -87 -88 -90 -90 TRANSISTOR COUNT: 1457 PROCESS: BiCMOS Chip Information |
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