Trying to remember IC name

Started by bitrex November 2, 2013
On Sun, 03 Nov 2013 01:14:32 -0700, jurb6006 wrote:

>>"I don't believe that Signetics ever had a single chip PLL synthesizer > 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.
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. -- Tim Wescott Wescott Design Services
On Sun, 03 Nov 2013 01:48:53 -0600, John S wrote:

> On 11/2/2013 8:36 PM, bitrex wrote: >> I'm trying to remember the name of a certain IC. I believe it was a >> PLL-type frequency synthesizer IC for AM/FM radios, to be used with an >> external local oscillator. I'm fairly certain it had the prefix >> SA-something, so it was a former Signetics chip. I don't think it's >> still in production by NXP, though. >> >> Any ideas? > > SA612, perhaps?
That's a mixer, not a synthesizer chip. -- Tim Wescott Wescott Design Services