AS3933 datasheet(51/64 Pages) AMSCO

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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

Minimum Frequency

For 32.768 kHz crystal

kHz

Typical Frequency

32.768

kHz

Maximum Frequency

kHz

Contribution of the

oscillator to the frequency

error

±5

ppm

Start-up Time

Crystal dependent

Duty cycle

Current consumption

300

Calibration time

Periods of reference clock

cycles

Current consumption

650

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Calibration time

Periods of reference clock

cycles

Current consumption

650

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