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MAX7418 Datasheet(数据表) 5 Page - Maxim Integrated Products |
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MAX7418 Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 page 
5th-Order, Lowpass, Switched-Capacitor Filters _______________________________________________________________________________________ 5 Note 1: The maximum fC is defined as the clock frequency fCLK = 100 x fC at which the peak S / (THD+N) drops to 68dB with a sinusoidal input at 0.2fC. Maximum fC increases as VIN signal amplitude decreases. Note 2: DC insertion gain is defined as ∆VOUT / ∆VIN. Note 3: MAX7418/MAX7421/MAX7422/MAX7425: fOSC (kHz) ≅ 87x103 / COSC (pF). MAX7419/MAX7420/MAX7423/MAX7424: fOSC (kHz) ≅ 110x103 / COSC (pF). Note 4: PSRR is the change in output voltage from a VDD of 4.5V and a VDD of 5.5V. -70 -65 fIN = 5fC -47.5 -43 -3.6 -3.0 -2.4 fIN = fC fIN = 3fC -0.3 0 dB fIN = 0.5fC PARAMETER MIN TYP MAX UNITS CONDITIONS BUTTERWORTH FILTERS—MAX7420/MAX7424 BUTTERWORTH FILTERS—MAX7420/MAX7424 FILTER CHARACTERISTICS (VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425 filter output measured at OUT, 10k Ω || 50pF load to GND at OUT, SHDN = VDD, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted.) __________________________________________Typical Operating Characteristics (VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425, fCLK = 2.2MHz, SHDN = VDD, VCOM = VOS = VDD / 2, TA = +25°C, unless otherwise noted.) -90 -60 -70 -80 -50 -40 -30 -20 -10 0 10 040 20 60 80 100 MAX7418/MAX7422 FREQUENCY RESPONSE (ELLIPTIC, r = 1.6) INPUT FREQUENCY (kHz) -60 -40 -50 -20 -30 0 -10 10 040 20 60 80 100 MAX7419/MAX7423 FREQUENCY RESPONSE (BESSEL) INPUT FREQUENCY (kHz) -80 -60 -70 -30 -40 -50 0 -10 -20 10 040 20 60 80 100 MAX7420/MAX7424 FREQUENCY RESPONSE (BUTTERWORTH) INPUT FREQUENCY (kHz) Insertion Gain Relative to DC Gain |
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