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AM336-1 数据表(PDF) 6 Page - Analog Microelectronics |
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AM336-1 数据表(HTML) 6 Page - Analog Microelectronics |
6 / 12 page IC FOR OPTO DETECTOR AM 336 analog microelectronics February 2005 6/12 frequency it to high the signal detection is not triggered. In case of a too low frequency a pulsed signal could occur at the output stages. Connection pins: FO, IRD, P/B AMPLIFIER: The input stage for the photo current is a transimpedance–amplifier. His impedance depends on the input frequency to reject ambient light. The input current, coming from pin INA, appears multiplied by the impedance between INA and OUTA at pin OUTA. For low frequencies this impedance is approximately RB (internal resistor) and for high frequencies RA (external resistor). Connection pins: INA, OUTA, ALR. SIGNAL DETECTION STAGE: The signal of the input stage is connected via a high–pass filter (CIN between OUTA and IND, RIN internal) to the inputs of comparator A and B (window comparator). The threshold voltages VTA and VTB and the hysteresis voltages VHA and VHB are generated by a constant current across the resistors RTA and RTB (RTA = 2 × RTB). The hysteresis is switched by the output signals of the D– flip–flops. Threshold and hysteresis levels are determined by external resistors (RD RH) and temperature compensated by an internal voltage reference (VR). The resistors have to be located as IND VTB VTB-VHA VTA+VHA VTA IRD QO LED t VTB=1.5 *VTA VHB=1.5*VHA Figure 2: Functional diagram |
类似说明 - AM336-1 |
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