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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3911B датащи(PDF) 21 Page - ams AG |
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AS3911B датащи(HTML) 21 Page - ams AG |
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21 / 155 page  ams Datasheet: 2014-Jun-12 [v1-08] AS3911B – 21 Appl icatio n I n f o rm a t i o n Gain in the second and third stage is 23 dB and can be reduced in six 3 dB steps. Gain of these two stages is included in AGC and Squelch loops or can be manually set in Receiver Configuration Register 4. Sending of direct command Reset Rx Gain is necessary to initialize the AGC, Squelch and RSSI block. Sending this command clears the current Squelch setting and loads the manual gain reduction from Receiver Configuration Register 4. Second stage has a second order low pass filtering characteristic, the pass band is adjusted according to sub-carrier frequency using the bits lp2 to lp0 of the Receiver Configuration Register 1. SeeFigure 13 for -1dB cut-off frequency for different settings. Figure 13: Low Pass Control Figure 14: First and Third Stage Zero Setting rec1<5> lp2 rec1<4> lp1 rec1<3> lp0 -1 dB point 0 0 0 1200 kHz 001 600 kHz 010 300 kHz 100 2 MHz 101 7 MHz Other Not used rec1<2> h200 rec1<1> h80 rec1<0> z12k First Stage Zero Third Stage Zero 0 0 0 60 kHz 400 kHz 1 0 0 60 kHz 200 kHz 010 40 kHz 80 kHz 0 0 1 12 kHz 200 kHz 011 12 kHz 80 kHz 1 0 1 12 kHz 200 kHz Other Not used |
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