TLC7524: tlc7524

Krao

Part Number: TLC7524
Other Parts Discussed in Thread: LM224

Hello,

I'm monitoring out. When I'm giving Digital input DB0 to DB7 is 255, but output is maximum of 3.7V. When I'm giving full digital input, I'm receiving 3.7V only. I need output of 0V to 5V, but I'm receiving of 0V to 3.7V only.

Thank you.

over 3 years ago

0 Paul_Frost over 3 years ago

TI__Guru 53393 points

Hi Krao,

Can you share your schematic? What is the VDD and Reference voltage?

Thanks,

Paul

0 KV over 3 years ago in reply to Paul_Frost

Prodigy 55 points

i have attached schematic

0 Paul_Frost over 3 years ago in reply to KV

TI__Guru 53393 points

Hi KV,

It does not seem that the LM224 supports Rail-to-rail output operation. I see some limitation in the datasheet that there can be VCC-1.5V as the minimum high voltage limit. If you increase the op amp's supply, does the output work? For example, can you change +5V supply to +6V without changing the reference voltage? You could also repalce the amplifier with a device that can operate closer to the supply the rail.

Thanks,

Paul

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TLC7524: tlc7524