alan.b.pearce@stfc.ac.uk wrote:
>>>>> I'm looking for a single device (meaning...I can do it with a couple =
of
>>>>>          =20
>>>> opamps,etc) that will accept a single ended 5V digital input, and give=
 me
>>>> differential output....+5/-5 out.  Rail to rail would be nice, but if =
I need to
>>>>        =20
>> run
>>    =20
>>>> it above 5V (say 9-12V) for the supply I can do that.  Highest frequen=
cy would be
>>>> about 5KHz that I would run thru it.
>>>>        =20
>>>>> Ideas?
>>>>>
>>>>>
>>>>>          =20
>>>> Look into RS-232 driver chips!
>>>>        =20
>>> RS232 won't give him differential output - that is why i suggest RS422/=
485 or CAN
>>>      =20
>> devices.
>>
>> AFAICS he wants differential (2 lines) as well as bipolar (+/-5V)
>>
>> RS422/485 won't give bipolar
>>
>> I'd suggest using 2 channels  of an RS232/432 driver, with an inverter f=
eeding one
>> input.
>>    =20
>
> Ok, I didn't pick up on the -5V requirement. I guess then using 3 blocks =
in a good old 1488 driver - one as the inverter between the two inputs of t=
he others - would work fine.
>
>
>  =20
A Max232 will do it. The 2 x RS232 RX on it are just inverters with 3V=20
threshold. It has two TX and is about +/- 8.5V from 5V supply. You can=20
use 3 resistors to make it +/- 5V on line. <20mA short circuit protected=20
too.




--=20
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