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AN4494 датащи(PDF) 20 Page - STMicroelectronics

номер детали AN4494
подробное описание детали  Bringing up the BlueNRG and BlueNRG-MS devices
PDF  34 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4494 датащи(HTML) 20 Page - STMicroelectronics

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XTAL centering test
AN4494
Set the spectrum analyzer to: Res BW = 1 KHz, SPAN = 500 KHz (see Figure 6:
"Frequency tone at Ch0 for the XTAL center test").
Generate a carrier wave tone at Ch0 (freq. 2.401750 GHz) using the ACI command:
HAL_TONE_START (a tone can be emitted at f = 2402 + k*2 - 0.250 MHz, with k = 0 to
39).
The difference between the desired tone and the measured tone is the frequency offset.
Figure 6: Frequency tone at Ch0 for the XTAL center test
5.6
Expected results
The offset limit is (as reported in the Reference section point ):
|Offset| < 50 KHz
If DUT freq > 2.4018 GHz → increase XTAL caps
If DUT freq < 2.4017 GHz → decrease XTAL caps
5.7
Note
N/A.
5.8
Other
N/A.
20/34
DocID026361 Rev 3



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