MikeN wrote in message . ..
I have a surplus PLL pc board which has on board a Fujitsu MB1507 PLL
chip, an OP123 op amp chip, and a Rockwell chip which I am unable to
identity.

The device is a Rockwell 41404P-34HK, and appears to be in line with
the rf feed from the VCO (external to the board) the rf input pin of
the PLL chip. In this location the chip could likely be acting as a
rf preamp or signal conditioner.

That would be the usual place to put a frequency divider in a PLL
chain. Could it be programmable? Could it be a prescaler? Google
wasn't very helpful in this case.

Cheers,
Tom