28 Jun
2009
28 Jun
'09
4:31 p.m.
Tony,
I believe it is an AD891D Rigid Disk Data Channel Qualifier !! The datasheet
( PDF ) is 491K if you want me to send it to you.
Best regards, Steven
I have another mystery IC in a hard disk. This one
seems to be made by
Analog Devices and is some kind of compaartor/filter.
Basically the read signals comes from the HDA (there's a preamp in there
I am pretty sure), through a couple of amplifier ICs (MC1350 and TL592)
and then goes to this device.
Here's what I know about it :
-- 14 pin ceramic DIL package
-- Analog Devices Logo, HP 1820-5489 house-code
-- Inputs (from the amplfier chain) on pins 4 and 13
Inductors between 3 and 2 and 1 and 14 (2 inductors), there may well
be other components connected there, some kind of filter
+5V on pins 12 and 6 (one may be an enable or something)
Ground on pin 5
Does that ring any bells with anyone?
-tony