Trying to remember IC name

SAF7730 perhaps. That was the a DSP IF chip usually used with a TEF6730 as the front end and LO. Sony used it in their nifty XDR-F1HD tuner. There are other similar chips... this may help:

Thanks for the reply, but I'm not sure that it's the one I'm thinking of. This was a much older and less sophisticated IC - it was probably available in the early 1980s. Came in a DIP package. I know my request was rather vague. I'll see if I can remember more about it.

I don't believe that Signetics ever had a single chip PLL synthesizer chip, for AM/FM or otherwise. I was designing marine and commerical radios at the time, and would have been aware of such a device. In the early 1980's, the high fashion single chip synthesizer was by Motorola: Wrong prefix and manufactory, but a fairly close description.

If it's a PLL synthesizer chip, perhaps a better clue as to the application, frequency range, control method, etc might limit the search.

On a sunny day (Sun, 03 Nov 2013 01:00:51 -0500) it happened bitrex wrote in :

Try typing 'synthesizer' with some numbers in ebay search. I was looking for one a while back and found many old chips. Finally did it in FPGA though.

NE565? TA2003?

Cheers

SA612, perhaps?

SAA1057 perhaps? or earlier SAA1056 + SAA1059?

chip, for AM/FM or otherwise."

I think they did. It was a single chip solution used in tuners installed in NAP products in the US, like Maganvox, Grosley and who knows. the number did start with SA, and I tried to figure out what it was after that but gave up. google is good but.....

It was a standard bus controlled PLL for NTSC US and I think it had an internal prescaler. the othe rchip in the tuner IIRC was the mixer/oscillator.

I doubt the chip was locked into the NTSC TV band so with the right data it could be used in anything witin its range, which would be from 54 Mhz to 0.89 Ghz.

In the next few days, since this is inexorably stuck in my head, I will check a couple of databases using different numbers out of memory to see if I can hit the chip number. Send beer.

Yes! The SAA1057. Thanks!

That matches my recollection. The ones that I recall looking at were pretty specific to use -- when they said "TV tuner" that's what they meant, and you didn't have much options to successfully wedge it into a marine-band radio.

That's a mixer, not a synthesizer chip.