Level shifter - how??

[Soren]

Hi,

I have a single 0-5V source that I want to convert to a -2.5 to 2.5V
source instead.. can anyone tell me what the name of such a circuit
is? or even have a link/reference on such a circuit?

Thanks!
Soren

 

[Eeyore]

Hi,

I have a single 0-5V source that I want to convert to a -2.5 to 2.5V
source instead.. can anyone tell me what the name of such a circuit
is? or even have a link/reference on such a circuit?

---
View in Courier:
+V
|
0->5V---[10k]----+-----------|+\
| | >---+-->-2.5V->+2.5V
[10k +--|-/ |
| | | [10k]
| | -V |
GHND>------------+ +---------+
|
[10k]
|
2.5V>-------------------------------+

You had me puzzled there until I realised it was to avoid using a
negative voltage although he'll need one anyway to get the -2.5 output.

Can't reduce the parts count though.

Graham

 

[neon]

Bad choise of words CONNECT while I blelive you means shift 0 to -2.5 and 5v to 2.5v. just add a cap in series and connect a puldown resistor to -2.5v and you will get -2.5 to 2.5v but that will be passive not active.

 

[Soren]

Hi,

I have a single 0-5V source that I want to convert to a -2.5 to 2.5V
source instead.. can anyone tell me what the name of such a circuit
is? or even have a link/reference on such a circuit?

---
View in Courier:
                             +V
                              |
0->5V---[10k]----+-----------|+\
                 |           |  >---+-->-2.5V->+2.5V
               [10k       +--|-/    |
                 |        |   |   [10k]
                 |        |  -V     |
GHND>------------+        +---------+
                                    |
                                  [10k]
                                    |
2.5V>-------------------------------+
JF  

Thanks John!