NRF24L01P-R7 datasheet(19/78 Pages) NORDIC

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nRF24L01+ Product Specification

5.5

Crystal specifications

Table 11. Crystal specifications

The crystal oscillator startup time is proportional to the crystal equivalent inductance. The trend in crystal

design is to reduce the physical outline. An effect of a small outline is an increase in equivalent serial

inductance Ls, which gives a longer startup time. The maximum crystal oscillator startup time, Tpd2stby =

1.5 ms, is set using a crystal with equivalent serial inductance of maximum 30mH.

An application specific worst case startup time can be calculated as :

Tpd2stby= Ls/30mH *1.5ms if Ls exceeds 30mH.

Note: In some crystal datasheets Ls is called L1 or Lm and Cs is called C1 or Cm.

Figure 3. Equivalent crystal components

Symbol

Parameter (condition)

Notes

Min.

Typ.

Max.

Units

Fxo

Crystal Frequency

MHz

ΔF

Tolerance

a b

a. Frequency accuracy including; tolerance at 25

ºC, temperature drift, aging and crystal loading.

b. Frequency regulations in certain regions set tighter requirements for frequency tolerance (For

example, Japan and South Korea specify max. +/- 50ppm).

±60

ppm

Equivalent parallel capacitance

1.5

7.0

Equivalent serial inductance

c. Startup time from power down to standby mode is dependant on the Ls parameter. See Table 16. on

page 24 for details.

Load capacitance

ESR

Equivalent Series Resistance

100

ESR

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