Data Sheet

20 | P a g e Espressif Systems Oct 12, 2013
ESP8266 802.11bgn Smart Device
11.2 External Reference Requirements
For an externally generated clock, the frequency can range from 26MHz to 52MHz can be used.
For good performance of the radio, the following characteristics are expected of the clock:
Parameter
Symbol
Min
Max
Unit
Clock amplitude
V
XO
0.2
1
Vpp
External clock accuracy
F
XO,EXT
-15
15
ppm
Phase noise @1kHz offset, 40MHz clock
-120
dBc/Hz
Phase noise @10kHz offset, 40MHz clock
-130
dBc/Hz
Phase noise @100kHz offset, 40MHz clock
-138
dBc/Hz