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Forum Post: RE: Output impedance of TX-SDK-V2 and power supply board

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Hi Dmitrijs, Impedances: The pulser ( LM96550 ) output on the TX-SDK-V2 board is "loaded" to simulate a transducer. If you like to attach an external transducer, you'd have to remove the "load" components on the board. From page 29 of the TX-SDK-V2 user's guide: "o The output waveforms of the Pulser can be monitored with high impedance oscilloscope probes at PS0 to PS7 or the outputs can be measured at the 8 RF connectors at J3. These 8 Pulser outputs have load components: CB51 to CB58 = 330pF & RB0 to RB8 = 2.49kΩ. o The 8 RF connectors at J3 can also directly drive an ultrasound transducer probe. In this case, CB51 to CB58 must be removed." I don't have the output impedance of the T/R switch ( LM96530 ). However, on the TX-SDK-V2 board, there are external components (e.g. DB0, RA11, CA12, RA41, RA31 for OUT0, etc.) between the LM96530 output pins and the J4 connector where the receiver (e.g. LM96511 ) would connect which essentially set your output impedance. Does this answer your question? Power Supply: Unfortunately we don't have any layout files for the power supply module except the schematic that you've already seen and have noted. Regards, Hooman

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