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DS90UB954-Q1: DS90UB954TRGZRQ1

Part Number: DS90UB954-Q1
  1. Kindly help with some information regarding TI deserializer DS90UB954TRGZRQ1.

    Information Required on I/O Pins -RIN0- & RIN1- pins.

    As per datasheet its mentioned that 15nF capacitor is recommended at RIN0- & RIN1- pins for AC coupling. Please help us with below details

  2. What should be the ESR value considering at what frequency for 15nF AC coupling capacitor at RIN0- & RIN1- pins?
  3. What kind of testing required for these pins ?
  4. What should be the minimum and maximum value of capacitance for 15nF capacitor for these pins?
  5. Overall tolerance range for 15nF capacitor in accordance with lifetime, temperature and related data with 15nF capacitor?
  • Hello,

    Thank you for your questions. The RIN0- and RIN1- pins must be AC coupled. It is recommended to do this with a 15nF capacitor and 50 ohm resistor terminated to ground when using a coax configuration. 

    2. We do not define a specific ESR value to aim for but simply recommend a low ESR. Additionally the voltage rating should be at least twice the value of the power supply voltage.

    3. Is there a particular test or spec you are wanting to verify for these pins? There is no required testing specific to the RIN +/- pins.

    4. It is not recommended to use below 15nF however up to 47nF could be used assuming that the device is in synchronous mode.

    5. The capacitors used on our EVM boards have a tolerance of +/- 10%