ICM7216 ekstern x-tal oscillator

/Lars

Overkill - hmmm, det ved jeg nu ikke. Det er vel vigtigt at en

Karl Erik.

extern oscillator f. eks. en TCXO. Den eksterne oscillator input er TTL kompatibel. Der skiftes til ekstern oscillator ved at aktivere den

Input (Pin 1).

Hilsen Klaus

Den 19-09-2014 22:36, Klaus Bahner skrev:

Hej Klaus.

af TTL signalerne?

Karl Erik.

Hej Karl Erik

VC-TXO-23SM-100-B (72kr ved 1 stk - dog uden forsendelse og told/moms):

-

Husk at atomure kan genbruges senere. Evt. kan den laves som et separat "mobilt" modul.

Alternativt - et "billigt" atomur.

bedre end frekvensstabilitet 50ppb; b for billion. "In stock" ikke

.

Dette er i hvert fald et atomur:

Pris:

An unmatched combination of breakthroughs ? in reduced size, weight and power consumption ? brings the accuracy and stability of atomic clocks to portable applications:

Citat: "... Breakthrough Leadership The CSAC?s unmatched portability derives from specs that include:

• 115mW power consumption

• 16cm3 volume

• 35g weight

• y < 5 x 10^-12 at = 1 hour short-term stability (Allan Deviation)

*

On 20/09/14 15.18, Glenn wrote: ...

...

(temperatur kompenseret) og ovnindlejrede XO (krystaloscillator).

OSC VCTCXO 10.000MHZ 3.3V SMD:

OSC TCXO 10.000MHZ 3.3V SMD:

Glenn

On 20/09/14 15.18, Glenn wrote: ...

Quantum? SA.45s Chip Scale Atomic Clock. An unmatched combination of breakthroughs - reduced Size, Weight and Power consumption (SWaP) - brings the accuracy and stability of atomic clocks to portable applications.

Glenn

First Atomic Clock Wristwatch:

I mindre model:

The World's First True Atomic Wristwatch - The Cesium 133. by John Patterson PhD - Bathys Hawaii:

Citat: "... Powered by a rechargeable lithium battery and capable of running up to

36 hours (depending on operating mode) the prototype uses a traditional analog dial display that features hours, minutes, seconds, date and current moonphase. ..."

Bathys Hawaii Reveals World's First Atomic Clock Wristwatch - The Cesium

133:

Glenn

Den 20-09-2014 15:18, Glenn skrev:

Hej Glenn.

Tak for links.

Fandt en kanon side:

Gerry har lavet en hel del rigtig gode videoer om emnet - nogle af dem varer op til 1 time.

Karl Erik.

Den 20-09-2014 15:54, Karl Erik Christensen skrev:

Karl Erik.

Hej Karl Erik

sket en stor udvikling inden det og priserne. Da referenceoscillatorer

bedre end frekvensstabilitet 50ppb; b for billion. "In stock" ikke

-

ca. 11.000kr OSC OCXO 10.000MHZ SINE WAVE PC +-0.1ppb:

ca. 4.600kr OSC OCXO 10.000MHZ SINE WAVE PC +-0.5ppb:

.

Billigste er 238kr; +-50ppb ca. 1.1W steady state:

Glenn

Det ser interessant ud.

Glenn

justerede den.

skyld :-)

Karl Erik.

Den fredag den 19. september 2014 15.23.11 UTC+2 skrev Karl Erik Christense n:

ed den er

fin

kstern

at

til sinus, eller er

ehandles af den IC ..?

alex

Nej de skriver at hvis du vil fjerne den interne oscillator (hvorfor

noget problem overhovedet. Sandsynligvis vil den eksterne indgang endda

en Schmitt Trigger ved indgangen.

i mange elektronik tidskrifter. Som dog alle mere eller mindre bare

Klaus

Den 20-09-2014 22:20, Klaus Bahner skrev:

nogle 24 Volts OM335).

ikke har brugt.

Karl Erik.

...

Hej Karl Erik

Mere info:

+-10ppb per dag

Opstartstid 10 mSek

mulige frekvenstrimning i VCTCXO nyttig.

-

serie-regulator og er pakket i SMD:

LT1019ACS8-2.5

LT1019ACS-5

LT1019 datablad:

Citat: "... The LT1019 is available in four voltages: 2.5V, 4.5V, 5V and 10V. It is a direct replacement for most bandgap references presently available including AD580, AD581, REF-01, REF-02, MC1400, MC1404 and LM168. ... Trim +-3,5% ... [pdf-side 6 Vigtigt:] LT1019-2.5* Stability with Output Capacitance ... Line regulation on the LT1019 is nearly perfect. A 10V change in input voltage causes a typical output shift of less than 5ppm. Load regulation (sourcing current) is nearly as good. A 5mA change in load current shifts output voltage by only 100uV. These are electrical effects, measured with low duty cycle pulses to eliminate heating effects. In real world applications, the thermal effects of load and line changes must be considered. ... [indbygget termometer:] The LT1019 has a TEMP pin like several other bandgap references. The voltage on this pin is directly proportional to absolute temperature

..."

Glenn

Hilsen Klaus