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MICRF405 датащи(PDF) 23 Page - Micrel Semiconductor

номер детали MICRF405
подробное описание детали  290MHz-980MHz ISM Band ASK / FSK Transmitter
PDF  46 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF405 датащи(HTML) 23 Page - Micrel Semiconductor

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Micrel
MICRF405
April 2006
23
M9999-041906
(408) 955-1690
VCO_Fr_Chk
Comments
0
VCO control voltage is not controlled
1
VCO control voltage is measured; if it is below 0.35V the VC_LO interrupt flag is set, if it is higher than
AVDD-0.35V the VC_HI flag is set
Table 13. VCO Control Voltage Out of Range Detection.
VCO_Fr_Auto
Comments
0
No calibration is done.
1
If VCO control voltage is below 0.35V or above AVDD-0.35V, the VCO frequency settings are altered until
the control voltage is within the window. No VC_LO or VC_HI interrupt flag is set. The new settings can be
read out; bits VCO_Freq_O[2:0] in interrupt register.
If PLL for some reason cannot obtain lock (i.e. if frequency is set wrongly), an interrupt will be given even
if VCO_Fr_Chk = 0.
Table 14. Automatic VCO Range Calibration.
VCO Tuning Range for Various VCO_Freq Settings
800.0
850.0
900.0
950.0
1000.0
1050.0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
Varactor Voltage [V]
7
6
5
4
3
2
1
0
Figure 10. RF Frequency vs. Varactor Voltage and VCO Frequency Bit.
VCO_freq
FreqBand=0
315MHz
FreqBand=1
433MHz
FreqBand=2 or 3
868, 915MHz
1
287
290
430
435
860
870
2
290
293
435
440
870
880
3
293
300
440
450
880
900
4
300
307
450
460
900
920
5
307
313
460
470
920
940
6
313
320
470
480
940
960
7
320
326
480
490
960
980
Table 15. Freq Ranges vs. VCO_freq and FreqBand.



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