On 20/9/21 5:37 pm, Julien Goodwin wrote:
>
>
> On 18/9/21 11:12 pm, Julien Goodwin wrote:
>>
>>
>> On 18/9/21 10:26 pm, Bob kb8tq wrote:
>>> Hi
>>>
>>> The chip is intended to be used with the divider engaged ( set to a divide
>>> of
>>> 2 or greater). That should act as a pretty good buffer
On 18/9/21 11:12 pm, Julien Goodwin wrote:
>
>
> On 18/9/21 10:26 pm, Bob kb8tq wrote:
>> Hi
>>
>> The chip is intended to be used with the divider engaged ( set to a divide
>> of
>> 2 or greater). That should act as a pretty good buffer if the layout is
>> reasonable.
>
> I'm using the -1
Did you say there's a 1 mH choke at the LDO input? I gather that
overall, you're regulating 5 V in to 3.3 V out, running the IC that
takes a few mA DC, and loading the CMOS output with 50 ohms scope input
(or a 50 ohm terminator on a scope or probe setup). I'd recommend the
following changes.
On 9/18/21 10:50 AM, Lux, Jim wrote:
LT3042 and LT3045 are your friend here. Excellent PSRR well up past 10
MHz.
If you need more current, you can just parallel them.
$6 each for the 3045 from Digikey
For best performance, take a look at the layout suggestions in the
3042/3045 datasheet,
On 9/18/21 7:38 AM, Bob kb8tq wrote:
You need a quiet linear regulator feeding the chip. Any switcher will drive it
nuts.
Indeed a lot of LDO’s are not very quiet. They also may be very poor at
isolating
you from switcher “crud”. You need to be careful about what you pick.
LT3042 and LT3045
Hi
> On Sep 18, 2021, at 9:12 AM, Julien Goodwin
> wrote:
>
>
>
> On 18/9/21 10:26 pm, Bob kb8tq wrote:
>> Hi
>>
>> The chip is intended to be used with the divider engaged ( set to a divide
>> of
>> 2 or greater). That should act as a pretty good buffer if the layout is
>> reasonable.
On 18/9/21 10:26 pm, Bob kb8tq wrote:
> Hi
>
> The chip is intended to be used with the divider engaged ( set to a divide of
> 2 or greater). That should act as a pretty good buffer if the layout is
> reasonable.
I'm using the -17 variant, no divider, running at the 26MHz fundamental.
> Loo
Hi
The chip is intended to be used with the divider engaged ( set to a divide of
2 or greater). That should act as a pretty good buffer if the layout is
reasonable.
Looking at the spectrum analyzer plots, you either have crud on the control
line ( ground it and see what happens … ) or on the
On 13/9/21 6:31 pm, Julien Goodwin wrote:
> https://www.microchip.com/en-us/product/PL500-16 (there's various other
> versions depending on the frequency you're after)
>
> Haven't seen any discussion about this on-list, but the PL500 is an
> easily (well, in normal times) available VCXO control ch
On 14/9/21 1:42 pm, Lux, Jim wrote:
> On 9/13/21 7:36 PM, Julien Goodwin wrote:
>>
>> On 14/9/21 12:59 am, Chris Caudle wrote:
>>> On Mon, September 13, 2021 3:31 am, Julien Goodwin wrote:
https://www.microchip.com/en-us/product/PL500-16
>>> ...
I've designed as an OCXO
>>> What tempera
On 9/13/21 7:36 PM, Julien Goodwin wrote:
On 14/9/21 12:59 am, Chris Caudle wrote:
On Mon, September 13, 2021 3:31 am, Julien Goodwin wrote:
https://www.microchip.com/en-us/product/PL500-16
...
I've designed as an OCXO
What temperature are you planning on running the oven? If that device i
On 14/9/21 12:59 am, Chris Caudle wrote:
> On Mon, September 13, 2021 3:31 am, Julien Goodwin wrote:
>> https://www.microchip.com/en-us/product/PL500-16
> ...
>> I've designed as an OCXO
>
> What temperature are you planning on running the oven? If that device is
> going inside the oven, watch
On Mon, September 13, 2021 3:31 am, Julien Goodwin wrote:
> https://www.microchip.com/en-us/product/PL500-16
...
> I've designed as an OCXO
What temperature are you planning on running the oven? If that device is
going inside the oven, watch the max operating ambient spec if 85 degrees.
--
Chri
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