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SM6661A Datasheet(PDF) 8 Page - Nippon Precision Circuits Inc |
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SM6661A Datasheet(HTML) 8 Page - Nippon Precision Circuits Inc |
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8 / 14 page  SM6661A SEIKO NPC CORPORATION —8 Frequency characteristics setting The frequency characteristics of SM6661A is adjustable by changing the value of external capacitors C1 and C2. The lower cutoff frequency “fCL” and upper cutoff frequency “fCH” are determined by the formula below; (These values should be set to meet the condition “fCL < fCH”, in order to construct the band-pass filter.) External components setting The values of R1 and C1 should be set considering the time constant (τ) that is determined by the formula below; The R2 resistor value is determined by R1 resistor value and output gain setting. Note that the offset voltage increases as the R2 value increases. The R2 recommended value is 27kΩ to 330kΩ. Sleep Mode Function The SM6661A has the sleep mode function. When SLEEP pin set to “High”, the SM6661A operation becomes sleep mode. In sleep mode operation, the current consumption becomes up to 1.0 µA and VSIG_OUT1 and VSIG_OUT2 pins are setting high-impedance. Control pin SM6661A operation SLEEP LOW Normal operation HIGH Sleep mode fCL = [Hz] 1 (2 π × R1 × C1) fCH = [Hz] 1 (2 π × R2 × C2) τ = R1 × C1 [s] |
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