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AS3930
Datasheet - D e t a i l e d D e s c r i p t i o n
8.8.3
External Clock Source
To clock the AS3930 with an external signal the crystal oscillator has to be enabled ( R1<0> =1). As shown in Figure 3 , the clock must be applied
on the pin XIN while the pin XOUT must stay floating. The RC time constant has to be 100 μ s with a tolerance of ±10% (e.g. R=680 k Ω and
C=22pF). In Table 25 , the clock characteristics are summarized.
Table 25. Characteristics of External Clock
Symbol
VI
Vh
Tr
Tf
T=1/2 π RC
Parameter
Low level
High level
Rise-time
Fall-time
RC Time constant
Min
0
0.9*V DD
90
Typ
100
Max
0.1*V DD
V DD
3
3
110
Units
V
V
μs
μs
μs
Note: In power down mode the external clock has to be set to V DD .
www.ams.com/LF-Receiver/AS3930
Revision 1.5
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