TDC1000: Ultrasound liquid analysis

Lars Roger Solem

Part Number: TDC1000
Other Parts Discussed in Thread: TDC7200

Hi,

I am designing a circuit for ultrasound liquid analysis. I have tested a bit on the TDC1000-TDC7200EVM and it looks promising. Now I want to design this on my own PCB. The MCU has a 8MHz oscillator which it shares with TDC1000 and TDC7200 ("8MHZ_clock"). I don't have a voltage divider between TDC1000 VDD and VCOM as the evaluation board has. Should I have that? TDC1000 and TDC7200 also share the same SPI.

Please evaluate my attached design.

Thanks!

TDC1000.pdf

over 4 years ago

0 Arjun_Prakash over 4 years ago

TI__Expert 7589 points

I am glad to hear that the EVM has produced good results and you like to move forward to design. SPI can be shared amongst TDC1000 and the TDC7200. If the micro can support dual SPI for simultaneous reading of TDC1000 and TDC7200 you could split the SPI. Its recommended that you connect a voltage divider on the VCOM pin primarily because the output of the VCOM is an analog buffer at providing a resistor divider to VCOm helps ensure faster bring up of the VCOM internally. I highly recommend to use 10Meg voltage divider circuits as shown in the EVM.

0 Lars Roger Solem over 4 years ago in reply to Arjun_Prakash

Prodigy 160 points

Hi Arjun,

Thanks for the feedback. Then I will apply the 10M voltage divider between VDD and VCOM.

Does the rest of the schematics look good to you?

Regards,

0 Arjun_Prakash over 4 years ago in reply to Lars Roger Solem

TI__Expert 7589 points

Hello,

The schematics looks good. Its inline with our recommended EVM schematics.

Thanks.

0 Lars Roger Solem over 4 years ago in reply to Arjun_Prakash

Prodigy 160 points

Thanks!

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TDC1000: Ultrasound liquid analysis