AW: AD633JN ?!

[Haible Juergen]

>> does anyone know if there exists a substitute for the AD633JN ?
>> (four quadrant multiplier/divider)
>> bert

>Try looking at the Exar XR2228.

Try the RC4200. It's a temperature compensated 1-quadrant multiplier 
which needs
a resistor network for 4-quadrant operation.
I have to admit, this doesn't look like the right way to do it at 
first, but I will use it for my Frequency shifter, because it's cheap 
and the specs look really good.
Ric Miller uses it as ringmodulator (as Korg did in the MS-50), and 
it's also in Barry Klein's book.
You need a bunch of 1% 100k resistors to get a similar precision as an 
untrimmed 633, and about the
same number of trimpots to increase precision.
I have to say that I haven't actually built the Freq shifter yet, so 
it's just from comparing data sheets.
Any comments about RC4200 vs. other multipliers are highly welcome!

JH.


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