[sdiy] discrete 3-bit AD converter??

[media at mail1.nai.net]

This might be a stupid question, but I'm willing to follow it up with an
even stupider question :)

I'd like to be able to convert a CV going from 0 to 5 volts into a six
3-bit binary numbers.  Well, just to illustrate my question, let's just say
I want four 2-bit numbers to represent one to four volts, such that:

1V = 00
2V = 01
3V = 10
4V = 11

I'm thinking I could do this with a stack of comparators each set to the
next highest voltage (off of a "totem pole" voltage divider run off of the
incoming CV), but I'm thinking there must be an easier way that would use
less chips.  If that is the best way, is there a single CMOS chip (like the
opposite of an LED segment driver) that will encode it into a binary
number??  Are there chips with multiple comparators IC's without the extra
pins for such a purpose??  Basically, I'm trying to devise a way to enable
a number of logic states with single control voltage.