TRF371109: Recommended parts and EVM layout clarifications

Marie: Please see my responses below.  --RJH

- Which microcontroller, ferrite bead, SPST and SHUNT would you recommend to use?

RJH>> I have enclosed the schematic and BOM for your reference.  There is no microcontroller, but there is a USB driver in the FTDI chip.  The switch is there for convenience to change the gain "manually"; you don't have to use the GPIO for that as you can control via SPI.

- To what refer the TP8 and TP9 on the TRF371x EVM layout?

RJH>> TP8,9 are test points to inject an external common mode voltage.  Voltages are referenced to common ground.  For the TRF3711 device you only need to be concerned about pin 24 (TP9) as that is the one used to control Vcm.

- To what refer RDBK, VOFFI on the TRF371x EVM layout?

RJH>> RDBK is the SPI readback pin to read back the programming registers.  You can disregard the VOFFI as it is not used in the TRF3711 (only the TRF3710).

- On the TRF371x EVM layout, should the different SH1 be connected? If yes, how?

RJH>> The "SH1" refers to the page number that the connection goes to.

- On the TRF371x EVM layout, can the DNI zero jumper (R8, R15, R21, R30, R31, R32 etc.) are be just grounded?

RJH>> No.  DNI stands for "Do Not Install".  In most cases those connections need to be open circuit.  The device pins that are labelled "NC" (No Connect) can be grounded if you want as they are truly not connected.

- On which substrate did you build the mother board? Do you use multi-layer?

RJH>> Yes, it is a multi-layer board.  We typically use Isola-370 which is an "upgraded" FR4 material.

BOM_TRF3711_REV_C_900M.xlsSCH_TRF3711_REV_C_08_26_08.pdf