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Documents Impedance matching when AD9717 or AD9779A interfaced with ADL5375
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  • HIGH-SPEED DAC SUPPORT COMMUNITY
  • +Documents
  • +AD768ARZ: FAQ
  • +AD9102: FAQ
  • +AD9106: FAQ
  • +AD9115: FAQ
  • +AD9116: FAQ
  • +AD9117: FAQ
  • +AD9119: FAQ
  • +AD9122: FAQ
  • +AD9129: FAQ
  • +AD9135: FAQ
  • +AD9142A: FAQ
  • +AD9144: FAQ
  • +AD9146: FAQ
  • +AD9148: FAQ
  • +AD9286: FAQ
  • +AD9712: FAQ
  • +AD9716: FAQ
  • +AD9717: FAQ
  • +AD9726: FAQ
  • +AD9734: FAQ
  • +AD9736: FAQ
  • +AD9739: FAQ
  • +AD9739A: FAQ
  • +AD9742: FAQ
  • +AD9744: FAQ
  • +AD9747: FAQ
  • +AD9748: FAQ
  • +AD974: FAQ
  • +AD9763: FAQ
  • +AD9765: FAQ
  • +AD9767:FAQ
  • +AD976A: FAQ
  • +AD9774: FAQ
  • +AD9776: FAQ
  • +AD9777: FAQ
  • +AD9779: FAQ
  • -AD9779A: FAQ
    • Impedance matching when AD9717 or AD9779A interfaced with ADL5375
  • +AD977: FAQ
  • +AD977A: FAQ
  • +AD9780: FAQ
  • +AD9783: FAQ
  • +AD9786: FAQ
  • +AD9788: FAQ
  • +AD9789: FAQ
  • +DPG3: FAQ

Impedance matching when AD9717 or AD9779A interfaced with ADL5375

Q 

Can you confirm why I need to use 500ohm or 50ohm impedance matching for the
AD9717 and AD9779A interfaced to ADL5375.
Sorry for that basic questions, but I am from the digital world.

 

 

A 

Remember, that the AD9717's and AD9779A's output and ADL5375's input
common-mode bias levels are both 500mV and hence do not require voltage
shifting circuitry.

With regards to the AD9717, whose fullscale output current=2mA, then to obtain
500mV bias on the output the voltage can vary from 0 to 1V for single-ended.
Therefore, the corresponding resistance (RBIP, RBIN) = 1V/2mA = 500ohms.

In the case of the AD9779A, the fullscale output current=20mA and to have an
output single-end voltage from 0 to 1V, then the corresponding resistance
(RBIP, RBIN) = 1V/20mA = 50ohms.

Refer to Figure 59 in the ADL5375's RevB datasheet for further details

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