smiller@wet.UUCP (Gregory Shane Miller) (03/15/91)
14 Wednesday March 1991
I'm looking for a simple 4 bit D/A IC. I have a 24 bit digital I/O card
of which 4 (output) lines would be connected to the 4 bit D/A IC. Each
line is driven with standard TTL values. I want to feed the analog output
into the speed control unit for a varible 40K RPM brushless DC spindle motor.
Since I'm controlling a spindle motor, high "sampling" rates are not needed.
I'm hoping that when the 4 output lines are:
4 3 2 1 <- Line number
| | | |
Line value -> 0 0 0 0 -> the spindle motor is OFF
0 -> 0V 0 0 0 1 -> the spindle motor runs at 2.6K RPM
1 -> +5V 0 0 1 0 -> the spindle motor runs at 5.2K RPM
0 0 1 1 -> the spindle motor runs at 7.8K RPM
.
.
.
1 1 1 1 -> the spindle motor runs at 40K RPM
Does such an IC exist? I need commerical quanities. I can be reached at
smiller@wet.UUCP. Thankyou very much.
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G. Shane Miller [ smiller@wet.UUCP ] out!