I realise one option for this is to use a pair of comparators or something like an MC33161 (though RS Components doesn't stock these). For space reasons the Micro8 package (MC33161MD or MC34161MD) would be preferred if I do use this.
However, I think it may be possible to implement this for the specific case I need using at most four surface mount transistors and possibly save some board space (or money).
The specification is simple:
Any voltage within +/- 200mV of ground is OK (you're allowed anywhere between [150mv, 210mv])
Any other voltage is bad.
Supplies available are: +7.5V, +5V, 0V (ground), -2V.
Using a pure voltage source in the circuit (e.g. a battery of e.g. 0.4V or 0.8V) is not allowed.
Output CMOS/TTL compatible (+5V, 0V).
The fewer components the better the solution.
Thanks
Dave
However, I think it may be possible to implement this for the specific case I need using at most four surface mount transistors and possibly save some board space (or money).
The specification is simple:
Any voltage within +/- 200mV of ground is OK (you're allowed anywhere between [150mv, 210mv])
Any other voltage is bad.
Supplies available are: +7.5V, +5V, 0V (ground), -2V.
Using a pure voltage source in the circuit (e.g. a battery of e.g. 0.4V or 0.8V) is not allowed.
Output CMOS/TTL compatible (+5V, 0V).
The fewer components the better the solution.
Thanks
Dave
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