MCP60x output swing

Graham2107 said:

I am using a Microchip MCP602 to buffer and filter, with unity gain, for a 0-5Vdc clean DC input.

According to the spec sheet the out should swing Vss+100mV and Vdd-100mV but for a +5Vdc input I get only 4.25Vdc output. Range 0-4.25Vdc works 100%, above that is flat at 4.25Vdc.

I am using 0u1 across the IC and have tried others from a new batch of IC's with the same results. I have checked for noise and nothing is apparent,

What is going wrong here?

Click to expand...

ericgibbs said:

Hi G,
Whats the output pin of the MCP6202 connected too.??
I use these on a 5V supply and I get within approx 100mV of +Vs, when connected to a Hi impedance load.

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MikeMl said:

So go and buy a modern, rail-to-rail output opamp.

Click to expand...

Graham2107 said:

I am using a Microchip MCP602 to buffer and filter, with unity gain, for a 0-5Vdc clean DC input.

According to the spec sheet the out should swing Vss+100mV and Vdd-100mV but for a +5Vdc input I get only 4.25Vdc output. Range 0-4.25Vdc works 100%, above that is flat at 4.25Vdc.

I am using 0u1 across the IC and have tried others from a new batch of IC's with the same results. I have checked for noise and nothing is apparent,

What is going wrong here?

Click to expand...

Roff said:

Are you saying that MCP604 is not a modern, rail-to-rail output opamp?

Click to expand...

MikeMl said:

Yep, although I should have said "So go and buy a modern, rail-to-rail input and output opamp"

Directly from the datasheet:

Click to expand...