[SI-LIST] Re: Crystal datasheet!!
- From: John Barnes <jrbarnes@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx, ashish.panpalia@xxxxxx
- Date: Wed, 24 Nov 2004 09:47:51 -0500
Ashish,
The series resistance of a crystal mainly depends on the:
* Resonant mode used.
* Cut (angle of the crystal slab versus the crystal axes).
* Operation at the fundamental frequency versus at an overtone.
From Table 11-4 in my book Robust Electronic Design Reference Book,
Volume 1:
Cut Range of R1, in ohms
------------------- --------------------
+2 degrees X 8 to 300,000
+5 degrees X 800 to 6,000
AT, fundamental 3 to 2,500
AT, 3rd Overtone 30 to 100
AT, 5th Overtone 40 to 190
AT, 7th Overtone 80 to 190
AT, 9th Overtone 200 to 250
AT, nth overtone 3 to 1,500
BT, fundamental 11 to 200
BT, 3rd Overtone to 150
DT 800 to 5,000
GT 1,500 to 2,500
JT 10,000 to 200,000
NT 8,000 to 125,000
P 2,500 to 3,000
SL 500 to 3,500
Tuning Fork 8 to 300,000
XY 10,000 to 75,000
X-Y Bar 10,000 to 75,000
Ceramic Resonator 4.8 to 150
Some oscillator circuits just may not work with certain types of
crystals, especially at frequencies below 100kHz or so.
John Barnes KS4GL, PE, NCE, ESDC Eng, PSE, SM IEEE
dBi Corporation
http://www.dbicorporation.com/
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