[time-nuts] Fast Rise/Fall Time Pulser

Robert LaJeunesse lajeunesse at mail.com
Wed Oct 11 14:34:32 EDT 2017


>From https://www.maximintegrated.com/en/design/packaging/topmark/ the MAX3949 is marked "AJK". I suspect BAA is some sort of date code.

> Sent: Wednesday, October 11, 2017 at 2:28 PM
> From: "Larry McDavid" <lmcdavid at lmceng.com>
> To: TekScopes at yahoogroups.com, "Time-Nuts Mail List" <time-nuts at febo.com>, "HP Aglient Reflector" <hp_agilent_equipment at yahoogroups.com>
> Subject: Re: [time-nuts] Fast Rise/Fall Time Pulser
>
> The Leo Bodnar pulser output level is adjustable but at outputs higher 
> than some 1 v P-P the rise/fall times increase. I reported the ~0.95 v 
> P-P as what was reported on the datasheet for *my* pulser.
> 
> Ok, per Leo's August 7, 2017 post, the output device is a Maxim MAX3949. 
> Mine is marked, "AJK  BAA." Does anyone know the origin or significance 
> of that marking?
> 
> Per Leo's August 5, 2017 post, the pulser fastest rise time occurs when 
> the output level is set to 820 mv and the scope reports 976 mvpp. That 
> is consistent with what is reported for my pulser on the supplied test 
> datasheet.
> 
> Why would you want to set the output level higher than that at which the 
> risetime is fastest? ~ 1 vpp seems enough.
> 
> Larry
> 
> 
> On 10/11/2017 8:29 AM, David DiGiacomo telists at davmar.org [TekScopes] wrote:
> > On Tue, Oct 10, 2017 at 11:01 PM, Larry McDavid <lmcdavid at lmceng.com> wrote:
> >  > Neither the Analog Devices nor the Maxim part (see below) data sheets
> >  > suggest the markings actually seen on the device used on the Leo Bodnar
> >  > pulser I received. As recently as July 8, 2017 Leo Bodnar described the
> >  > device as "based on 572 comparator from AD" in a posting on EEVblog.
> > 
> > The Maxim datasheet doesn't say anything about the product marking.
> > 
> > Here's Leo's later post:
> > https://www.eevblog.com/forum/projects/yet-another-fast-edge-pulse-generator/msg1275011/#msg1275011
> > 
> >  > One poster commented on the high pulse voltage of ±1 volt; that is not
> >  > correct. The Leo Bodnar pulser output is about 0.95 v P-P.
> > 
> > It's adjustable up to 1.2VPP into 50ohms, or 2.4VPP open circuit.
> > 
> > Product page: 
> > http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=124&products_id=295
> -- 
> Best wishes,
> 
> Larry McDavid W6FUB
> Anaheim, California  (SE of Los Angeles, near Disneyland)
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