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.
Alexander,
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.
Srdjan,
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@limemicro.com wrote:
Alexander,
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.
-
Alexander Chemeris -
Srdjan Milenkovic