Hello,
Could you please let me know the VCO tuning voltage range(VCPout range) of LMX2430/2433/2470?
We would like to these device with frequency range of 1636.2~1671.6MHz with 300kHz step. Ref in is 19.2MHz.
Best Regards,
Ryuji Asaka
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Ryuji,
The simple answer is thatl, you can get the charge pump within 0.5 V of the supply rails. So if you are at 2.75 V, then this means that you have a usable tuning range of 0.5 to 2.25 V.
In more detail, if you go outside of this range to a voltage of 0.3 V or 2.5V, the consequence is that the charge pump will work, but the mismatch will be worse, causing a longer on time that leads to higher spurs and phase noise.
Regards,
Dean