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AM336-1 数据表(PDF) 6 Page - Analog Microelectronics

部件名 AM336-1
功能描述  IC FOR OPTO DETECTOR
Download  12 Pages
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制造商  AME [Analog Microelectronics]
网页  http://www.ame.com.tw/
标志 AME - Analog Microelectronics

AM336-1 数据表(HTML) 6 Page - Analog Microelectronics

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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


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