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MAX7409 Datasheet(数据表) 4 Page - Maxim Integrated Products |
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MAX7409 Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 page 
5th-Order, Lowpass, Switched-Capacitor Filters 4 _______________________________________________________________________________________ COSC = 1000pF (Note 3) CONDITIONS 21 30 38 fOSC Internal Oscillator Frequency MIN TYP MAX SYMBOL PARAMETER IN = COM (Note 4) 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 1.2 1.5 2.7 3.6 VDD Supply Voltage 0.5 VIL Clock Input Low 2.5 VIH Clock Input High ±13.5 ±20 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 FILTER CHARACTERISTICS (VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, filter output measured at OUT, 10kΩ || 50pF load to GND at OUT, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted.) 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. Note 2: DC insertion gain is defined as ∆VOUT / ∆VIN. Note 3: fOSC (kHz) ≅ 30 x 103 / COSC (pF). Note 4: PSRR is the change in output voltage from a VDD of 4.5V and a VDD of 5.5V. CLOCK POWER REQUIREMENTS SHUTDOWN CONDITIONS UNITS MIN TYP MAX PARAMETER mA IDD Supply Current ELECTRICAL CHARACTERISTICS—MAX7413/MAX7414 (continued) (VDD = +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) fIN = 0.5fC -1 -0.74 fIN = fC -3.6 -3.0 -2.4 fIN = 4fC -41.0 -35 fIN = 7fC dB -64.3 -58 fIN = 0.5fC dB -0.3 0 fIN = 3fC fIN = fC -3.6 -3.0 -2.4 Insertion Gain Relative to DC Gain -47.5 -43 fIN = 5fC -70 -65 Insertion Gain Relative to DC Gain BESSEL FILTERS—MAX7409/MAX7413 BUTTERWORTH FILTERS—MAX7410/MAX7414 |
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