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How to get TTL output from XR2211

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te04-0202

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How to get TTL output from XR2211. I am currently getting +12V for logic '1' and 0V for logic '0'. But need +5V for logic '1' and 0V for logic '0'.
Please help me.
 

Hello,

You can use a simple Voltage Divider to Feed a CMOS buffer such as CD4050 and then take the 5 Volt output. Since CD4050 is CMOS and power with 5V its good for your output. But for the input you have 0-12V so you require to reduce it to some 4 or 5V . This is easily achieved using a proportional Voltage Divider given by below eq:
Vout = Vin*R2/(R1+R2)
Code: 
   +12V
   ------
      |
      \
      /
      \ R1
      /
      |
      + ----> to CD4050 input
      |
      \
      /
      \ R2
      /
      |
   ------
   GND 0V

The CD4050 is still required after this divider to give you a Low o/p impedance or High Drive capability so that your Ifan-out can be good for Interfacing.
Hope that this works for you.

Best of Luck for your design.

Warm Regards,
Boseji
 

    T

    te04-0202

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