Trying to remember IC name

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
http://www.wescottdesign.com

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
http://www.wescottdesign.com