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TDC1000-GASEVM: GASEVM short TOF mode and impedance matching circuit

Thibault Helle
Expert 2090 points

Part Number: TDC1000-GASEVM

Hello,

I have connected my TDC1000-7200 EVM together with the BSTEVM for clamp-on flow metering. Both boards are modified to work with 1MHz transducers after your suggestions here on E2E. Everything seems to work fine but I need to reduce dTOF zero-flow error. I have two questions:

1. So I would like to use the TS3A44159PWR to impedance match but I saw that it can only take in 4.7V max. I assume this must be connected after the boosting circuit TX/RX where the voltage is around 30V, do you have any other similar chip that could work for that? 

2. I am also wondering if it is alright to use short TOF mode while using BSTEVM boosting circuit as the RX line might be open while boosting? (The echo arrives at 17us.)

Thank you for your help.

Regards,
Thibault