Some useful comments from another list:

From: "Paul Breed"

Analog devices has three gyro chips...

ADXRS150   +/- 150deg/sec
ADXRS300    +/- 300 deg/sec
and a new part ADXRS401 +/- 75 deg/sec.

The drift is not good, with good compensation drift is  on the order of
0.3deg /sec.

Digikey has the 150 and 300, to get the 401 you need to order directly from
the
analog devices site www.analog.com, if you are in the US this is usually
cheaper than Digikey.
If you are not a BGA soldering expert then you want an ADXRSxxxEB, where
EB stands for Evaluation Board. a small PCB with the gyro already attached
and
presented as a 16 or 20 pin standard DIP.

Analog is currently out of EB versions so you would need to order that from
Digikey.
I've ordered 4 of the ADXRS401's I'll let you know if their stability is
better than the 150
in about 2 weeks.  Please note that the gyro is also "G" sensitive.

The best apogee detector would be smart, detect pitch or yaw change AFTER
the acceration stops.


Paul



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