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 Post subject: Databook/Datasheet: SN297xx Texas Instruments
PostPosted: Jan Tue 30, 2018 9:27 am 
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Joined: Jan Tue 30, 2018 8:51 am
Posts: 2
Location: Germany, near Düsseldorf
Hello,

I'm searching over years for a datasheet including the devices:
SN29770, SN29771, SN29772, SN29773 from Texas Instruments
or
H770B1, H771B1, H772B1, H773B1 from SGS-Ates
or
M770, M771, M772, M773

These circuits include four analog switches, to control the tuning voltage in TX sets and radio receiver.

I need this datasheet for an extensive guidebook over the Saba receiver series 92xx.

I searched into all directions: forums, database, Ti Europe, Ti USA, Ti book seller, electronic experts, TV and radio shops, many universities, with no result.

Many Thanks
Tommy


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 Post subject: Re: Databook/Datasheet: SN297xx Texas Instruments
PostPosted: Jan Tue 30, 2018 11:33 pm 
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Joined: Aug Thu 12, 2010 6:25 pm
Posts: 195
Location: Durham, NC
Is it similar to the CD4066 quad analog gate? Such as http://www.ti.com/lit/ds/symlink/cd4066b.pdf
The pinout might be the same, with slightly different characteristics. I was an RCA analog engineer, so I'm not so familiar with TI stuff.

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Mark Nelson
A collector of TV signal boosters and UHF converters -- God help me!
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 Post subject: Re: Databook/Datasheet: SN297xx Texas Instruments
PostPosted: Jan Wed 31, 2018 3:34 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 441
I know this chip (but I don't have data on it). It was used in Australian Pye TVs as well.

I think its origins are TI Europe, possibly UK, late 1960s or early 1970s.

It's a mutually exclusive 4 bit latch that's cascade-able, so if you want 8 channel keys you use 2 chips, linked together. It switches tuning voltages and bandswitch settings from a tuning pot array. Voltages can be up to 33 volts so it's not a normal logic part.. Inputs can be from an elastomeric keyboard or finger resistance touch sensors. It also drives indicator LEDs.

I may be able to find a circuit that uses it, but I guess you have one of those....


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 Post subject: Re: Databook/Datasheet: SN297xx Texas Instruments
PostPosted: Jan Wed 31, 2018 1:47 pm 
New Member

Joined: Jan Tue 30, 2018 8:51 am
Posts: 2
Location: Germany, near Düsseldorf
Many Thanks

I have circuits normally 8 chanel up to a 16 channel application with SN29770 to SM29773, a lot of samples and I know the function, but I am surprised that no data sheets exist although these circuits have been installed for a lot of years in so many different TV sets, receiver and tuner devices.

Tommy


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 Post subject: Re: Databook/Datasheet: SN297xx Texas Instruments
PostPosted: Jan Wed 31, 2018 2:14 pm 
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Joined: May Fri 29, 2009 4:35 am
Posts: 2071
Location: Chicago, IL USA
All I could find so far is an application schematic showing a SN29700 and SN29701

http://dede92dubois.free.fr/alacouleur/24/b/40.jpg


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