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a
Make Wide Temperature Range, Ultralow Drift Accelerometers
Using Low Cost Crystal Ovens
by Charles Kitchin
AN-385
APPLICATION NOTE
ONE TECHNOLOGY WAY
•
P.O. BOX 9106
•
NORWOOD, MASSACHUSETTS 02062-9106
•
617/329-4700
Commercial crystal ovens have been used for many
years to stabilize radio frequency oscillators which need
to maintain a near constant frequency over wide tem-
perature ranges. These same products can be used to
maintain an accelerometer, such as the ADXL50 and
ADXL05, at a constant operating temperature. This effec-
tively provides a very low drift, wide temperature range
acceleration measurement circuit.
The ADXL50 and ADXL05 accelerometers provide a
linear voltage output that varies directly with applied ac-
celeration. With the ADXL50, the nominal sensitivity is
19 mV per g centered around a +1.8 volt 0 g offset. The
change in output voltage over temperature (i.e., drift) of
this offset is very small compared with the amplitude of
high g level signals but becomes more significant when
the accelerometer is measuring low g levels. In cases
where a true dc (i.e., gravity measuring) response is
needed, such as when measuring tilt angle, the 0 g offset
drift needs to be kept very low.
The crystal oven specified here, an Isotemp #M050570 is
available for $15.00 (in 100s), is small—only 3/4" in diam-
eter by 1/2" high, and operates from the same +5 V sup-
ply voltage as the accelerometer. This particular model
maintains the accelerometer at +70 °C, which is just right
for our lowest cost “J” grade devices specified for op-
eration over the 0 °C to +70°C commercial temperature
range. These ovens are available for operation at other
temperatures up to +95 °C and with different supply volt-
ages. For an “A” –40 °C to +85°C industrial grade device,
an oven with an operating temperature of +85 °C should
be used; this will provide the greatest overall operating
temperature range. Note that, although the oven’s speci-
fied tolerance is ±3°C, its typical performance is much
better as long as the accelerometer is carefully fitted to
the oven as described in this application note.
Figure 1 shows the measured 0 g drift of a "J" grade
ADXL50 accelerometer alone and when placed inside a
M050570 crystal oven. By itself, the accelerometer’s 0 g
bias level is drifting at an average rate of 0.65 mV/ °C;
(note that the drift of this particular unit is a bit higher
than the 0.5 mV/ °C level of a typical ADXL50JH device).
With the accelerometer mounted inside the crystal oven,
the measured drift is reduced to less than 1 mV over
the entire –55 °C to +65°C range. Since the 0 g bias
drift of the ADXL05 is much lower than that of the
ADXL50, even better results can be obtained for low g
measurement.
+15
–45
–30
–40
–35
–15
–25
–20
–10
–5
0
+10
+5
+105–35–55 +85+65+45+25+5–15
TEMPERATURE – °C
MEASURED 0g UNIT – mV
XL50 AND OVEN
UNCOMPENSATED
"J" GRADE ADXL50
Figure 1. ADXL50 0 g Drift With & Without Using the
Isotemp Model M050570 Crystal Oven
Because the oven can only apply power to
heat
its inter-
nal cavity (and cannot cool it down), its preset tempera-
ture must be higher than the planned operating
temperature. When the outside ambient temperature
increases to greater than 10 °C below the oven’s preset
temperature—in this case 60 °C (70°C minus 10°)—the
accelerometer’s temperature now begins to vary and its
0 g offset starts to change.