TDC1000-TDC7200EVM: Is Interfacing of Multiple Transducers possible on one module???

>>>We wish to know if we have to run three pairs of transducers on one EVM module. Since TDC1000 can support only one pair. Do we need multiple EVM modules to support three pairs? As that would get very expensive. Is it possible/ is there another module where multiple TDC1000's are on one board??

That's right TDC1000 can support only one pair. Sorry, we don't have a module that supports multiple TDC1000s.

>>>Also is TDC1000 capable of supporting a 40KHz transducer??? Or does it support only a 1MHz one?? Also if it doesn't support the 40KHz one, is there some sort of external circuitry that Texas Instruments can provide to facilitate support of 40KHz Transducer

TDC1000 is capable of supporting a 40kHz transducer. Two things about 40kHz transducers
a) Since air is very absorptive of ultrasonic energy to see any echo, you need to excite the transducer with higher voltage (say 30V). We have a TDC1000GASEVM that is targeted for such applications
b) 40kHz transducers have a very wide beam angle so we don't see very good echo detection with TDC1000. We have used more with 200kHz transducers (with 7deg beam angle) for that reason.

You can check this e2e posting
e2e.ti.com/.../498792

Thanks,
Vishy