[SI-LIST] Re: Crystal datasheet!!

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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