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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS7000 датащи(PDF) 40 Page - ams AG |
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AS7000 датащи(HTML) 40 Page - ams AG |
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40 / 92 page  Page 40 ams Datasheet Document Feedback [v1-12] 2018-Feb-26 AS7000 − Detailed Description Optical Signal Conditioning Figure 52: Optical Signal Conditioning Synchronous Demodulator An optional synchronous demodulator can be used to detect small optical signals in the presence of large unwanted noise (ambient light). Since the detector synchronizes to the LED frequency, the demodulator can only be used of the measurement sequencer is running. It includes input filer (high pass at 200Hz, adjustable low pass) and an 2nd order adjustable output low pass. The demodulator itself multiplies the signal by +1 / 0 / -1 with a timing which is controlled by the sequencer. Note(s): The optical signal conditioning stage need sigref_ en=1 for operation. High Pass Filter An optional high pass filter can be used to remove unwanted DC-components from the signal and allows further amplification. In order to guarantee fast settling times of the filter, four cutoff frequencies can be chosen. Gain Stage An optional gain stage can be used to amplify the signal after the DC-component has been removed. * ADC gain_byp sd_byp Synchronous Demodulator Gain Stage hp_byp High Pass Filter sd_bw aa_freq 200Hz sd_en hp_freq hp_en gain_g gain_en from TIA Sequencer |
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