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TSW1400EVM: TSW1400EVM

Part Number: TSW1400EVM
Other Parts Discussed in Thread: ADS42LB69EVM,

Hi,

I was planning to use ADS42LB69EVM with TSW1400evm.

I am thinking of using AWG2021 as the clock source for the ADC.

It is mentioned that the Max clock freq is 250 MHz and Vpp should be 1 in the user guide.
For AWG2021, under the clock generator section: Freq range is 10-250 MHz and in the External Outputs Section: Amplitude Range is 0.05V to 5 Vp-p into 50 ohms.

When I referred to the Layout design of ADC- FPGA interface, the resistor is not a separate attribute but included in the Layout trace itself.

Can you help me with the input impedance and also if this clock source works well.

  • Raeleen,

    The AWG is terminated into a 50Ω load (resistance) while the trace is a 50Ω impedance.  The if you set the AWG to output a 1V signal, without the 50Ω termination resistor the DUT will see 2V.  There appears to be a 50Ω termination resistor on the board at R58.  This will need to be installed or you will need to cut the voltage level from the AWG in half to compensate for the lack of termination