VCOREG in LMS6002D
alexander.chemeris at gmail.com
Tue Sep 25 11:46:45 UTC 2012
Ok, I see now. Thanks for the explanation!
I have a couple more questions about the values for the chip init
sequence we use - in the next e-mail.
On Tue, Sep 25, 2012 at 6:41 AM, Srdjan Milenkovic
<s.milenkovic at limemicro.com> wrote:
> VCOREG is in fact on chip LDO which takes 3.3V and generates 1.8V for VCOs
> supply. However, we do not recommend internal VCO 1.8V regulators to be used
> as they are more noisy than the external ones. Hence, by default internal
> regulators are powered down and bypassed so clean external 1.8V can be
> supplied via the chip pins.
> On 25/09/2012 05:19, Alexander Chemeris wrote:
>> Hi guys,
>> Could anyone tell me, the software guy, what may be the purpose of
>> VCOREG block in LMS6002D (Figure 3.4 at the Programming Guide)? In our
>> current code it's always powered down and not used, and I just wonder
>> whether it could be used for frequency hopping and what are other
>> potential uses. If I understand correctly, it's a kind of fine tuning
>> for the PLL output frequency.
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