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数据搜索系统，热门电子元器件搜索 |
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MAX7426 Datasheet(数据表) 4 Page - Maxim Integrated Products |
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MAX7426 Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 page 
5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters 4 _______________________________________________________________________________________ COSC = 1000pF (Note 3) CONDITIONS 13.5 17.5 21.5 fOSC Internal Oscillator Frequency MIN TYP MAX SYMBOL PARAMETER Measured at DC SHDN = GND Operating mode, no load VCLK = 0 or 3V 0.5 VSDL SHDN Input Low 2.5 VSDH SHDN Input High 70 PSRR Power-Supply Rejection Ratio 0.2 1 ISHDN Shutdown Current 0.75 1.0 2.7 3.6 VDD Supply Voltage 0.5 VIL Clock Input Low 2.5 VIH Clock Input High ±7.5 ±12.5 ICLK Clock Output Current (internal oscillator mode) V V dB µA V V V µA kHz UNITS SHDN Input Leakage Current V SHDN = 0 to VDD ±0.2 ±10 µA ELECTRICAL CHARACTERISTICS—MAX7427 (continued) (VDD = +3V, filter output measured at OUT pin, 10k Ω || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) ELLIPTIC FILTER CHARACTERISTICS (r = 1.25) (VDD = +5V for MAX7426, VDD = +3V for MAX7427, filter output measured at OUT, 10k Ω || 50pF load to GND at OUT, SHDN = VDD, VCOM = VOS =VDD / 2, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) Note 1: The maximum fC is defined as the clock frequency fCLK = 100 ✕ fC at which the peak SINAD drops to 68dB with a sinu- soidal input at 0.2fC. Note 2: DC insertion gain is defined as ∆VOUT / ∆VIN. Note 3: fOSC (kHz) ≈ 17.5 ✕ 103 / COSC (COSC in pF). Note 4: The input frequencies, fIN, are selected at the peaks and troughs of the ideal elliptic frequency responses. fIN = 0.68fC fIN = 0.38fC fIN = 3.25fC fIN = 1.43fC fIN = 1.25fC fIN = 0.87fC fIN = 0.97fC fIN = fC CONDITIONS -0.4 0.2 0.4 dB -0.4 -0.2 0.4 Insertion Gain with DC Gain Error Removed (Note 4) -37.2 -35 -37.2 -35 -38.5 -34 -0.4 -0.2 0.4 -0.4 0.2 0.4 -0.7 -0.2 0.2 UNITS MIN TYP MAX PARAMETER mA IDD Supply Current CLOCK POWER REQUIREMENTS SHUTDOWN |
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