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AS3933 Datasheet(PDF) 51 Page - ams AG

Part # AS3933
Description  3D Low Frequency Wake-Up Receiver
PDF  64 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3933 Datasheet(HTML) 51 Page - ams AG

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ams Datasheet
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[v1-08] 2015-Sep-02
AS3933 − Detailed Description
Crystal Oscillator
In case the user decides to use the Crystal Oscillator as reference
clock a 32.768 kHz quartz can be used in case the tolerance
setting for the frequency detection is relaxed (R2<1:0>=00).
Should this not be the case, then Figure 56 shows how the
frequency of the quartz has to be chosen.
If the AS3933 works in the bandwidth 23-40 kHz, then it is
recommended not to use the XTAL oscillator to avoid any
coupling between the input antennas and the quartz.
Figure 57:
Characteristics of XTAL
RC-Oscillator
Figure 58:
Characteristics of RCO
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Crystal accuracy (initial)
Overall accuracy
±120
ppm
Crystal motional resistance
60
K
Ω
Minimum Frequency
For 32.768 kHz crystal
25
kHz
Typical Frequency
32.768
kHz
Maximum Frequency
45
kHz
Contribution of the
oscillator to the frequency
error
±5
ppm
Start-up Time
Crystal dependent
1
s
Duty cycle
45
50
55
%
Current consumption
300
nA
Calibration time
Periods of reference clock
65
cycles
Current consumption
650
nA
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Calibration time
Periods of reference clock
65
cycles
Current consumption
650
nA



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