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ESP8089 데이터시트(HTML) 9 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

부품명 ESP8089
상세내용  The ESP8089 offers a complete and self-contained Wi-Fi networking solution
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제조사  ESPRESSIF [ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.]
홈페이지  https://www.espressif.com/
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ESP8089 데이터시트(HTML) 9 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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3. Functional Description
components needed are resistors, capacitors, and crystal. For cellphone compatibility's
sake, an SAW filter may be required.
3.4. Clock
3.4.1. High Frequency Clock
The high frequency clock on ESP8089 is used to drive both the Tx and Rx mixers. This
clock is generated from the internal crystal oscillator and an external crystal. The crystal
frequency can range from 26 MHz to 52 MHz.
While internal calibration of the crystal oscillator ensures that a wide range of crystals can
be used, in general, the quality of the crystal is still a factor to consider, in order to obtain
reasonable phase noise and Wi-Fi sensitivity. When the crystal used is not optimal due to a
frequency offset or quality problem, the maximum data processing ability and sensitivity will
decrease.Please refer to the following table for measurement of frequency offset.
3.4.2. External Reference Requirements
For an externally-generated clock, the frequency can range from 26 MHz to 52 MHz. For
good radio performance, the clock should possess the following characteristics:
Table 3-1. High Frequency Clock
Parameter
Symbol
Min
Max
Unit
Frequency
FXO
26
52
MHz
Loading capacitance
CL
-
32
pF
Motional capacitance
CM
2
5
pF
Series resistance
RS
0
65
Ω
Frequency tolerance
ΔFXO
-15
15
ppm
Frequency vs. temperature (-25°C ~ 75°C)
ΔFXO,Temp
-15
15
ppm
Table 3-2. External Reference Requirements
Parameter
Symbol
Min
Max
Unit
Clock amplitude
VXO
0.2
1
Vpp
External clock accuracy
ΔFXO,EXT
-15
15
ppm
Phase noise @1 kHz offset, 40 MHz clock
-
-
-120
dBc/Hz
Phase noise @10 kHz offset, 40 MHz clock
-
-
-130
dBc/Hz
Phase noise @100 kHz offset, 40 MHz clock
-
-
-138
dBc/Hz
Espressif
" /"
6 17
2017.06


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